ADVANCED AERODYNAMICS & STRUCTURES INC/
10QSB, 1997-11-14
AIRCRAFT
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                   FORM 10-QSB

(Mark One)
   [x]          QUARTERLY REPORT UNDER SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                For the quarterly period ended September 30, 1997

   [ ]                       TRANSITION REPORT UNDER
                      SECTION 13 OR 15(d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934.
                        For the transition period from to

                        Commission file Number 000-21749



                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
        (Exact name of small business issuer as specified in its charter)



           Delaware                                             95-4257380
State or other jurisdiction of                               (I.R.S. Employer
incorporation or organization)                              Identification No.)


                             3501 Lakewood Boulevard
                          Long Beach, California 90808
                    (Address of principal executive offices)

                                 (562) 938-8618
                           (Issuer's telephone number)


         Check whether the issuer (1) filed all reports  required to be filed by
Section 13 or 15(d) of the Exchange  Act during the  preceding 12 months (or for
such shorter period that the registrant was required to file such reports),  and
(2) has been subject to such filing requirements for the past 90 days.

                                 YES [X] NO [ ]

As of November 11, 1997, the issuer had outstanding  6,900,000 shares of Class A
Common  Stock,  2,000,000  shares of Class B Common Stock,  4,000,000  shares of
Class E-1 Common Stock and 4,000,000 shares of Class E-2 Common stock.



<PAGE>


                         PART I - FINANCIAL INFORMATION

Item 1.  Financial Statements


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)

                                  Balance Sheet
                                   (unaudited)

<TABLE>
                                          December 31, 1996  September 30, 1997
                                          -------------------------------------
<S>                                       <C>                <C>

Assets
Current Assets:
   Cash and cash equivalents               $24,222,000        $ 6,922,000
   Marketable securities                     2,026,000          4,912,000
   Certificate of deposit                       12,000          1,012,000
   Prepaid expenses and other current 
     assets                                    155,000            445,000
                                         --------------------------------------
         Total current assets               26,415,000         13,291,000

Long-term Assets:
   Restricted cash                                              8,500,000
   Property and equipment, net               1,686,000          2,092,000
   Other assets                                                   689,000
                                         --------------------------------------
         Total long-term assets            $ 1,686,000         11,281,000
                                         ======================================
         Total assets                      $28,101,000        $24,572,000
                                         ======================================
</TABLE>
















                 See accompanying notes to financial statements.


                                        1

<PAGE>


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)



                            Balance Sheet (continued)
                                   (unaudited)

<TABLE>
                                                         December 31, 1996   September 30, 1997
                                                         --------------------------------------
<S>                                                       <C>                 <C>
Liabilities and Stockholders' Equity

Current liabilities:
   Accounts payable                                        $   145,000           $   111,000
   Accrued liabilities                                         158,000               443,000
                                                         --------------------------------------
         Total current liabilities                             303,000               554,000

Long-term liabilities:             
   Bonds payable                                                                     170,000
   Deferred revenue                                                                  370,000
                                                         --------------------------------------
         Total long-term liabilities                                                 540,000
                                                         --------------------------------------
         Total liabilities                                     303,000             1,094,000
                                                         --------------------------------------

Stockholders' equity:
   Preferred stock, par value $.0001 per share;
      5,000,000 shares authorized; no shares
      issued and outstanding
   Class  A  Common  Stock,  par  value  $.0001  
      per  share;  60,000,000  shares authorized; 
      6,900,000 shares issued and outstanding                    1,000                 1,000
   Class B Common Stock, par value $.0001 per share;
      10,000,000 shares authorized; 2,000,000 shares
      issued and outstanding
   Class E-1  Common  Stock,  par  value  $.0001  
      per  share;  4,000,000  shares authorized; 
      4,000,000 shares issued and outstanding
   Class E-2  Common  Stock,  par  value  $.0001  
      per  share;  4,000,000  shares authorized, 
      4,000,000 shares issued and outstanding
   Warrants to purchase common stock:
      Public Warrants                                          473,000               473,000
      Class A Warrants                                      11,290,000            11,290,000
      Class B Warrants                                       4,632,000             4,632,000
   Additional paid-in capital (note 5)                      35,730,000            35,652,000
   Deficit accumulated during the development stage        (24,328,000)          (28,570,000)
                                                         --------------------------------------
         Total stockholders' equity                         27,798,000            23,478,000
                                                         --------------------------------------
         Total liabilities and stockholders' equity        $28,101,000           $24,572,000
                                                         ======================================

</TABLE>







                 See accompanying notes to financial statements.


                                        2

<PAGE>


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                             Statement of Operations
                                   (unaudited)

<TABLE>
                                                                                                            Period from
                                                                                                          January 26, 1990
                                                Three Months Ended               Nine Months Ended         (inception) to
                                                   September 30,                   September 30,            September 30,
                                          -----------------------------------------------------------------------------------------
                                               1996             1997           1996            1997             1997
                                          -----------------------------------------------------------------------------------------
<S>                                         <C>               <C>             <C>            <C>            <C>    
Other income                                $                 $               $   7,000     $    7,000      $     717,000
Investment income                                3,000           243,000          4,000        884,000          1,054,000
                                          -----------------------------------------------------------------------------------------
                                                 3,000           243,000         11,000        891,000          1,771,000
Costs and expenses:
   Research and development costs                              1,781,000                     3,013,000         16,649,000
   Preoperating costs                                                                                             282,000
   General and administrative expenses          249,000          827,000      1,418,000      2,014,000          9,404,000
   Loss on disposal of assets                                                                  106,000            463,000
   Interest expense                             134,000                         319,000                         1,840,000
   In-process research and development
      acquired                                                                                                    761,000
                                          -----------------------------------------------------------------------------------------
                                                383,000        2,608,000      1,737,000      5,133,000         29,399,000
                                          -----------------------------------------------------------------------------------------
Loss before extraordinary item                 (380,000)      (2,365,000)    (1,726,000)    (4,242,000)       (27,628,000)

Extraordinary loss on retirement of Bridge      
      Notes                                                                                                      (942,000)
                                          -----------------------------------------------------------------------------------------
        Net loss                            $  (380,000)     $(2,365,000)   $(1,726,000)   $(4,242,000)      $(28,570,000)
                                          -----------------------------------------------------------------------------------------
Net loss per share                                $(.11)           $(.27)         $(.51)         $(.48)
                                          -----------------------------------------------------------------------------------------
Weighted average number of shares 
     outstanding                              3,400,000        8,900,000      3,400,000      8,900,000
                                          -----------------------------------------------------------------------------------------

</TABLE>









                 See accompanying notes to financial statements.


                                        3

<PAGE>
                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                        Statement of Stockholders' Equity

 
<TABLE>
                                                                                        Common Stock
                              Preferred Stock          Class A             Class B              Class B-1            Class B-2
                             Shares     Amount     Shares    Amount     Shares    Amount     Shares    Amount     Shares    Amount
<S>                          <C>        <C>        <C>       <C>        <C>       <C>        <C>       <C>
Common stock issued                                                     418,094    $--       836,189     $--      836,189     $--

Common stock issued in
exchange for in-process
research and development                                                201,494     --       402,988      --      402,988      --

Imputed interest on 
advances from stockholder

Net loss from inception to
December 31, 1994
                             -------------------------------------------------------------------------------------------------------

Balance at December 31,
1994                                                                    619,588     --     1,239,177     --     1,239,177      --

Imputed interest on 
advances from stockholder

Net loss
                             -------------------------------------------------------------------------------------------------------

Balance at December 31,
1995                                                                    619,588     --    1,239,177      --    1,239,177       --

Conversion of stockholder
advances                                                                598,011     --    1,196,021      --    1,196,021       --

Conversion of officer loans                                             187,118     --      374,236      --      374,236       --

Stock issued in consideration
for services in 1994, 1995
and 1996                                                                595,283     --    1,190,566      --    1,190,566       --

Imputed interest on advances
from stockholder

Net proceeds from initial
public offering of Units                          6,000,000  $1,000

Net proceeds from exercise
of overallotment option                             900,000     --

Warrants issued in
connection with issuance of
Bridge Notes

Net loss
                              ------------------------------------------------------------------------------------------------------

Balance at December 31,
1996                                             6,900,000   $1,000   2,000,000     --    4,000,000      --   4,000,000        --

Adjustment to proceeds from
initial public offering and
exercise of overallotment
option

Net loss
                              ------------------------------------------------------------------------------------------------------

Balance at September 30,
1997 (unaudited)                                6,900,000    $1,000   2,000,000     --    4,000,000      --   4,000,000        --
</TABLE>




                 See accompanying notes to financial statements

                                       4
<PAGE>

                     Advanced Aerodynamics & Structure, Inc.
                        (A Development Stage Enterprise)


                  Statement of Stockholder's Equity (continued)


<TABLE>
                                                                                           Deficit
                                 Bridge              Warrants                            Accumulated
                              Warrants to                                Additional       During the
                                Purchase                                  Paid-in         Development
                              Common Stock     Class A      Class B       Capital            Stage           Total
<S>                           <C>              <C>          <C>           <C>           <C>   
 
Common stock issued                                                      $7,500,000                       $7,500,000
     
Common stock issued in
exchange for in-process
research and development                                                    361,000                          361,000
 
Imputed interest on 
advances from stockholder                                                   776,000                          776,000

Net loss from inception to
December 31, 1994                                                                      $(19,252,000)    $(19,252,000)
                            -------------------------------------------------------------------------------------------

Balance at December 31,
1994                                                                      8,637,000     (19,252,000)     (10,615,000)

Imputed interest on 
advances from stockholder                                                    23,000                           23,000

Net loss                                                                                 (1,688,000)      (1,688,000)
                            -------------------------------------------------------------------------------------------

Balance at December 31,
1995                                                                      8,660,000     (20,940,000)     (12,280,000)

Conversion of stockholder
advances                                                                 10,728,000                       10,728,000

Conversion of officer loans                                                 336,000                          336,000

Stock issued in consideration
for services in 1994, 1995
and 1996                                                                  1,507,000                        1,507,000

Imputed interest on advances
from stockholder                                                             11,000                           11,000

Net proceeds from initial
public offering of Units                       $9,583,000  $4,166,000    12,566,000                       26,316,000

Net proceeds from exercise
of overallotment option                         1,707,000     466,000     1,922,000                        4,095,000

Warrants issued in
connection with issuance of
Bridge Notes                     $473,000                                                                    473,000

Net loss                                                                                (3,388,000)       (3,388,000)
                            -------------------------------------------------------------------------------------------

Balance at December 31,
1996                             $473,000     $11,290,000  $4,632,000   $35,730,000   $(24,328,000)      $27,798,000

Adjustment to proceeds from
initial public offering and
exercise of overallotment
option                                                                      (78,000)                         (78,000)

Net loss                                                                               (4,242,000)        (4,242,000)
                           --------------------------------------------------------------------------------------------

Balance at September 30,
1997 (unaudited)                 $473,000     $11,290,000  $4,632,000   $35,652,000   $28,570,000)       $23,478,000

</TABLE>

               See accompanying notes to financial statements

                                        5


<PAGE>
                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)

                            Statement of Cash Flows
                                  (unaudited)
           
  
<TABLE>
                                                                                                       Period from
                                                                                                    January 26, 1990
                                                                     Nine Months Ended               (inception) to
                                                                        September 30,                 September 30,
                                                           -----------------------------------------------------------------------
                                                                  1996               1997                 1997
                                                           -----------------------------------------------------------------------
                                                              (unaudited)         (unaudited)
<S>                                                          <C>                 <C>                 <C>
Cash flows from operating activities:
   Net loss                                                  $(1,726,000)        $(4,242,000)        $(28,570,000)
   Adjustments to reconcile net loss to net cash
   used in operating activities:
      Noncash stock compensation expense                         590,000                  --            1,207,000
      Noncash interest expense                                   105,000                                  336,000
      Cost of in-process research and development
         acquired                                                                                         761,000
      Imputed interest on advances from stockholder               11,000                                  810,000
      Extraordinary loss on retirement of Bridge Notes                                                    942,000
      Depreciation and amortization                              245,000             272,000            2,086,000
      Loss on disposal of assets                                                     106,000              463,000
      Changes in assets and liabilities:
          Decrease (increase) in prepaid expenses and 
              other current assets                                                  (290,000)            (445,000)
          Increase in other assets                                                  (689,000)            (689,000)
          Increase (decrease) in accounts payable                121,000             (34,000)             111,000
          Increase (decrease) in accrued liabilities            (389,000)            285,000              343,000
          Increase in interest payable                          (177,000)
          Increase in deferred revenue                                               370,000              370,000               
          Increase in receivable from officer                   (115,000)       
                                                           -----------------------------------------------------------------------
         Net cash used in operating activities                (1,335,000)         (4,222,000)         (22,275,000)
                                                           -----------------------------------------------------------------------
Cash flows from investing activities:
   Purchased restricted cash                                                      (8,500,000)          (8,500,000)
   Proceeds from insurance claims upon loss of aircraft                                                    30,000
   Proceeds from disposal of assets                                                    3,000                3,000
   Capital expenditures                                                             (787,000)          (4,634,000)
   Purchase of certificate of deposit                              (1,000)        (1,000,000)          (1,012,000)
   Purchase of marketable securities                           (1,499,000)        (6,212,000)          (8,238,000)
   Proceeds from sale of marketable securities                                     3,326,000            3,326,000
                                                           -----------------------------------------------------------------------
         Net cash used in investing activities                 (1,500,000)       (13,170,000)         (19,025,000)
                                                           ------------------------------------------------------------------------
Cash flows from financing activities:
   Advances from stockholder                                                                           10,728,000
   Proceeds from issuance of common stock prior to
      initial public offering                                                                           7,500,000

</TABLE>


                                        6

<PAGE>


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)

                      Statement of Cash Flows (continued)
                                  (unaudited)

<TABLE>
                                                                                                       Period from
                                                                                                     January 26, 1990
                                                                     Nine Months Ended                (inception) to
                                                                       September 30,                   September 30
                                                           ------------------------------------------------------------------------
                                                                  1996               1997                  1997
                                                           ------------------------------------------------------------------------
<S>                                                          <C>                  <C>                  <C>
   Net proceeds from initial public offering and
      exercise of over-allotment option                                          (78,000)               30,333,000
   Net proceeds from bridge financing                                                                    6,195,000
   Repayment of bridge financing                                                                        (7,000,000)
   Repayment of obligation under capital leases                 (15,000)                                   (40,000)
   Proceeds from loan from officer                              402,000                                    336,000
   Repayment of loan from officer                              (226,000)
   Repayment of bank note                                      (900,000)
   Repayment of loan from SIDA Corporation                     (110,000)
   Repayment of other short-term loans                         (565,000)
   Proceeds from bridge financing, net of issuance costs      6,195,000
   Increase in deferred offering costs                         (586,000)
   Proceeds from bonds                                                           170,000                   170,000
                                                           ------------------------------------------------------------------------
        Net cash provided by financing activities             4,195,000           92,000                48,222,000
                                                           ------------------------------------------------------------------------
Net increase (decrease) in cash and cash equivalents          1,360,000      (17,300,000)                6,922,000
Cash and cash equivalents at beginning of period                 --           24,222,000                        --
                                                           ------------------------------------------------------------------------
Cash and cash equivalents at end of period                  $ 1,360,000      $ 6,922,000               $ 6,922,000
                                                           ========================================================================
Supplemental cash flow information:
   Cash paid for interest                                                                              $   694,000
                                                                                                 
Supplemental disclosure of noncash investing and
   financing activities:
   Stockholder advances converted to common stock           $10,728,000                                $10,728,000
   Loan from officer converted to common stock              $   336,000                                $   336,000
   Common stock issued for noncash consideration
       and compensation                                     $ 1,507,000                                $ 1,507,000
   Liabilities assumed from ASI                                                                        $   400,000
   Common stock issued for in-process research and
       development acquired                                                                            $   361,000
   Equipment acquired under capital leases                                                             $    40,000
   Deposit surrendered as payment for rents due                                                        $    80,000
                                                                                                
</TABLE>





                 See accompanying notes to financial statements.


                                        7

<PAGE>


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                          Notes to Financial Statements

1.   General

     In the opinion of the  Company's  management,  the  accompanying  unaudited
     financial  statements  include all  adjustments  (which include only normal
     recurring  adjustments)  necessary for a fair presentation of the financial
     position of the Company at September 30, 1997 and the results of operations
     and cash  flows for the nine  months  ended  September  30,  1997 and 1996.
     Although  the Company  believes  that the  disclosures  in these  financial
     statements are adequate to make the  information  presented not misleading,
     certain information and footnote disclosures normally included in financial
     statements  prepared  in  accordance  with  generally  accepted  accounting
     principles  have  been  condensed  or  omitted  pursuant  to the  rules and
     regulations  of  the  Securities  and  Exchange   Commission.   Results  of
     operations for interim periods are not necessarily indicative of results of
     operations to be expected for any other interim period or the full year.

     The  financial  information  in this  quarterly  report  should  be read in
     conjunction  with the audited  December 31, 1996  financial  statements and
     notes thereto included in the Company's annual report filed on Form 10-KSB.

     The Company is a development  stage  enterprise.  On December 3, 1996,  the
     Company  successfully  completed an initial public  offering to finance the
     continued development,  manufacture and marketing of its product to achieve
     commercial  viability.  The net proceeds of the  offering  were and will be
     used to amend its Federal Aviation  Administration ("FAA") Type Certificate
     for  technical  revisions  to  its  product,  to  obtain  a FAA  Production
     Certificate for its product,  to repay  borrowings  under a bridge loan, to
     expand the  Company's  sales and  marketing  efforts,  to  establish  a new
     manufacturing  facility, and to acquire production materials and additional
     tooling and equipment.

2.   Net Loss Per Share

     The Company's net loss per share was computed based on the weighted average
     number  of shares of common  stock  outstanding  during  the three and nine
     month  periods  ended   September  30,  1996  and  1997  and  excludes  all
     outstanding  shares of Class E-1 and Class E-2  Common  Stock  because  the
     conditions  for the  lapse of  restrictions  on such  shares  have not been
     satisfied.

     Pursuant to Securities and Exchange  Commission Staff  Accounting  Bulletin
     No. 83,  certain common stock  equivalents  issued by the Company have been
     included as  outstanding in net loss per share  computations  for the three
     and nine month periods ended September 30, 1996.  Common stock  equivalents
     were not included in the net loss per share  computation  for the three and
     nine month periods ended September 30, 1997 as their effect on net loss per
     share is antidilutive.

     In February 1997, the Financial Accounting Standards Board issued Statement
     of Financial  Accounting  Standards ("SFAS") No. 128, "Earnings per Share."
     SFAS No. 128  establishes  standards for computing and presenting  earnings
     per share ("EPS") and supersedes APB Opinion No. 15,  "Earnings per Share."
     It replaces the  presentation  of primary EPS with a presentation  of basic
     EPS. It also requires dual presentation of basic and diluted EPS on the

                                       8
<PAGE>

                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                          Notes to Financial Statements


     face  of the  income  statement  for  all  entities  with  complex  capital
     structures and requires a  reconciliation  of the numerator and denominator
     of the  basic EPS  computation  to the  numerator  and  denominator  of the
     diluted EPS computation. SFAS No. 128 will become effective for the Company
     for the year ending  December 31, 1997.  The impact of the adoption of SFAS
     No.  128 on the  Company's  financial  statements  is  not  expected  to be
     material.


3.   Stock Option Plan

     On March 4, 1997,  options  to  purchase  210,000  shares of Class A Common
     Stock were granted,  at an exercise price of $5 per share, by the Company's
     Board of Directors to certain employees,  officers,  consultants and agents
     of the Company.  On May 27,  1997,  options to purchase  100,000  shares of
     Class A Common Stock were granted to the President, at an exercise price of
     $5.00 per share.

4.   Industrial Development Bonds

     On August 5, 1997,  the  Company  entered  into a loan  agreement  with the
     California  Economic  Development  Financing  Authority for the issuance of
     $8,500,000 in variable rate demand  industrial  development bonds ("IDBs").
     The Company will use the proceeds from the IDBs to finance the construction
     and  installation  of a 200,000  square  foot  manufacturing  facility  and
     related manufacturing equipment.

     The Company was required to provide cash collateral to a bank in the amount
     of  $8,500,000  for an  irrevocable  direct-pay  letter of  credit  for the
     payments of principal and interest.  The letter of credit,  unless extended
     or terminated by the Company or the bank, will expire on August 5, 2002.

5.   Land Lease for Manufacturing and Headquarters Facility

     On  October  17,  1997 the  Company  entered  into a Lease  Agreement  (the
     "Lease") with the City of Long Beach (the "Landlord"),  whereby the Company
     leased from the Landlord approximately 10 acres of land located on the Long
     Beach Airport.  The purpose of the Lease is to effectuate the  construction
     of an  approximately  200,000 square foot  manufacturing  and  headquarters
     facility.   The  Lease  also  contains   options  to  lease  other  airport
     properties.  The monthly rent under the Lease is $4,500, which monthly rent
     escalates to approximately $15,600 after five (5) years.

     The Lease term  commences on November 15, 1997 (subject to extension by the
     Landlord) but not until all  "Conditions to Commencement of Term" have been
     met.  The lease term is 30 years with an option to renew for an  additional
     10 years.

6.   Contract to Construct a Manufacturing and Headquarters Facility

     On October 29, 1997, the Company  entered into an agreement with Commercial
     Developments  International/West  (Design/Builder)  whereby  Design/Builder
     shall design and build an approximately  200,000 square foot  manufacturing
     and headquarters  facility. The contract sum for this project is "Cost plus
     Fixed Fees" with a  Guaranteed  Maximum  Price of  $6,300,000.  Any savings
     realized upon  completion  and  acceptance of the project will be shared by
     the Design/Builder  and the Company.  The Company believes that the project
     will be completed in the second quarter of 1998.



                                       9
<PAGE>

                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


Item 2. Plan of Operations

     Certain  statements   contained  in  this  report,   including   statements
concerning the Company's future cash and financing  requirements,  the Company's
ability to obtain market  acceptance of its aircraft,  the Company's  ability to
obtain  regulatory  approval for its aircraft,  and the  competitive  market for
sales of small business aircraft and other statements contained herein regarding
matters that are not historical  facts, are forward looking  statements;  actual
results  may  differ  materially  from  those set forth in the  forward  looking
statements, which statements involve risks and uncertainties,  including without
limitation those risks and uncertainties set forth in the Company's Registration
Statement on Form SB-2 (No. 333-12273) under the heading "Risk Factors."

     The Company is a development stage enterprise organized to design, develop,
manufacture and market propjet and jet aircraft intended  primarily for business
use. Since its inception,  the Company has been engaged  principally in research
and  development  of its  proposed  aircraft.  In March 1990,  the Company  made
application  to the FAA for a Type  Certificate  for the  JETCRUZER  450,  which
Certificate  was ultimately  granted in June 1994. As a result,  the Company has
not generated any operating  revenues to date and has incurred  losses from such
activities.  The Company  believes it will continue to  experience  losses until
such time as it commences the sale of aircraft on a commercial scale.

     Prior to commencing commercial sales of the JETCRUZER 500, the Company will
need to, among other things,  complete the  development of the aircraft,  obtain
the  requisite  regulatory  approvals,  establish an  appropriate  manufacturing
facility, hire additional engineering and manufacturing personnel and expand its
sales and marketing  efforts.  The Company  estimates  that the cost to complete
development  of the  JETCRUZER  500 and  obtain  an  amendment  of its FAA  Type
Certificate will be approximately  $8,000,000.  This amount includes the cost of
equipment and tooling (estimated at approximately $1,500,000), static and flight
testing  of  the  aircraft  (estimated  at  approximately  $2,500,000)  and  the
employment of the necessary  personnel to build and test the aircraft (estimated
at approximately $4,000,000).

     The Company expects to receive progress payments during the construction of
aircraft and final payments upon the delivery of aircraft.  However, the Company
believes it will continue to  experience  losses until such time as it commences
the sale of aircraft on a commercial scale.

     Through the end of the third quarter of 1998, the Company  intends to focus
its efforts in the following areas: (i) the completion of the development of the
JETCRUZER 500, including, among other things, adding a larger engine, completing
the  pressurization,  environmental  systems,  and de-icing  capabilities of the
aircraft,  obtaining  autopilot  certification,  and  lengthening the aircraft's
fuselage;  (ii)  obtaining an amendment to the  Company's  Type  Certificate  to
include the JETCRUZER 500,  including the manufacture of FAA conformed models of
the JETCRUZER 500 and static and flight testing;  (iii) building a manufacturing
facility capable of producing the JETCRUZER 500 on a commercial scale, including
establishing a production line in such facility,  acquiring production inventory
and  additional  equipment,  and  tooling and  computer  hardware  and  software
systems;  (iv)  obtaining a production  certificate  from the FAA and commencing
commercial  production of the JETCRUZER  500; (v) expanding the Company's  sales
and marketing  staff and  increasing  its marketing  efforts with respect to the
JETCRUZER 500; and (vi) increasing the Company's engineering,  manufacturing and
administrative  staff in  anticipation  of increased  development and production
activities.  The Company  believes  that the net proceeds from the December 1996
IPO will be sufficient to finance its plan of operations  through  approximately
the third  quarter  of 1998,  based  upon the  current  status  of its  business
operations,  its current plans and current economic and industry conditions.  If
the Company's estimates prove to be incorrect,  however, then during such period
the Company may have to seek additional  sources of financing,  reduce operating
costs and/or curtail growth plans.

Liquidity and Capital Resources

     At September 30, 1997, the Company had working  capital of $12,737,000  and
stockholders'  equity of  $24,572,000.  Since its inception in January 1990, the
Company has experienced  continuing  negative cash flow from operations,  which,
prior to its recent IPO,  resulted  in the  Company's  inability  to pay certain
existing liabilities in a timely manner. The Company has financed its operations
through private funding of equity and debt and its December 1996 IPO.

                                       10
<PAGE>

                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)




     The Company expects its cash  requirements to increase in the future due to
higher expenses associated with product development,  the scale-up of production
(including  capital  investment in production  equipment),  intensification of a
sales and  marketing  program,  the hiring of  personnel  and other  anticipated
operating activities. The Company also expects to continue to incur losses until
such time, if ever, as it obtains regulatory  approval for the JETCRUZER 500 and
related production  processes and market acceptance for its proposed aircraft at
selling  prices  and  volumes  which  provide  adequate  gross  profit  to cover
operating costs and generate  positive cash flow. The Company's  working capital
requirements will depend upon numerous factors, including the level of resources
devoted by the Company to the scale-up of manufacturing and the establishment of
sales and marketing  capabilities and the progress of the Company's research and
development program for the JETCRUZER 500 and other proposed aircraft.

     The Company  expects that the net  proceeds of the  December  1996 IPO will
enable it to meet its  liquidity and capital  requirements  at least through the
third quarter of 1998, by which time the Company expects to have received a type
certificate  and a production  certificate  for the  JETCRUZER 500 and commenced
commercial  production  and sale of the JETCRUZER  500. Such proceeds are being,
and will be used primarily for amendment of the Type  Certificate,  the purchase
of equipment and tooling,  the  establishment of a manufacturing  facility,  and
sales and marketing.  The Company's capital requirements are subject to numerous
contingencies  associated  with  development  stage  companies.  Specifically if
delays are  encountered in amending the current Type  Certificate,  the time and
cost  of  obtaining  such  certification  may  be  substantial,  may  render  it
impossible for the Company to complete such new or amended certification and may
therefore  have a  material  and  adverse  effect on the  Company's  operations.
Further,  if the Company has not completed the  development of the JETCRUZER 500
or  received  the  required  regulatory  approvals  and  successfully  commenced
commercial  sales of its aircraft by the third quarter of 1998,  the Company may
require  additional  funding to fully implement its proposed  business plan. The
Company has no commitments  from any third parties for any future  funding,  and
there can be no assurance  that the Company will be able to obtain  financing in
the future from bank  borrowings,  debt or equity  financing or other sources on
terms acceptable to the Company or at all. In the event necessary financing were
not obtained,  the Company would be materially and adversely  affected and might
have to cease or substantially reduce operations.

     The Company had no other material capital commitments at September 30, 1997
other than as discussed in this report.  The Company intends to hire a number of
additional employees and to establish a larger manufacturing  facility,  both of
which will require substantial  capital resources.  The Company anticipates that
it will  hire  approximately  10  employees  over the next  six  months  and 150
employees  over  the  next 21  months,  including  engineers  and  manufacturing
technicians necessary to produce its aircraft.



                                       11
<PAGE>

                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)



Charge to Income in the Event of Conversion of Performance Shares

     In the  event  the  Company  attains  certain  earnings  thresholds  or the
Company's Class A Common Stock meets certain minimum bid price levels, the Class
E Common Stock will be  converted  into Class B Common  Stock.  In the event any
such converted Class E Common Stock is held by officers, directors, employees or
consultants,  the maximum  compensation expense recorded for financial reporting
purposes  will be an amount  equal to the fair value of the shares  converted at
the time of such  conversion  which  value  cannot be  predicted  at this  time.
Therefore,  in the event the Company  attains such earnings  thresholds or stock
price levels, the Company will recognize a substantial charge to earnings during
the  period in which  such  conversion  occurs,  which  would have the effect of
increasing the Company's loss or reducing or eliminating  its earnings,  if any,
at that time. In the event the Company does not attain these earnings thresholds
or minimum bid price levels, and no conversion  occurs, no compensation  expense
will be recorded for financial reporting purposes.

Financing of Manufacturing and Headquarters Facility

     On August 5, 1997, the Company  entered into agreements with the California
Economic Development  Financing Authority (the "Authority"),  The Sumitomo Bank,
Limited  (the "Bank") and  Rauscher  Pierce  Refnes,  Inc.  (the  "Underwriter")
whereby the Authority issued $8,500,000 in industrial development bonds ("IDBs")
to the  Authority  and loaned the proceeds to the Company.  The Bank  provided a
letter of credit to support the payment of  principal  and  interest on the IDB.
The  Company  will use the  loan  proceeds  from  the IDBs for the  acquisition,
construction and equipping of an approximately 200,000 square foot manufacturing
and headquarters facility located in the City of Long Beach, California.

     The Company  was  required to provide  cash  collateral  to the Bank in the
amount of $8,500,000 for a stand-by  letter of credit in favor of the holders of
the IDBs,  which stand-by letter of credit will expire on August 5, 2002, if not
terminated earlier by the Company or the Bank.

Item 5.  Other Information

Land Lease for Manufacturing and Headquarters Facility

     On  October  17,  1997 the  Company  entered  into a Lease  Agreement  (the
"Lease")  with the City of Long  Beach (the  "Landlord"),  whereby  the  Company
leased  from the  Landlord  approximately  10 acres of land  located on the Long
Beach Airport.  The purpose of the Lease is to effectuate the construction of an
approximately 200,000 square foot manufacturing and headquarters  facility.  The
Lease also contains options to lease other airport properties.  The monthly rent
under the Lease is $4,500, which monthly rent escalates to approximately $15,600
after five (5) years.

     The Lease term  commences on November 15, 1997 (subject to extension by the
Landlord) but not until all  "Conditions to Commencement of Term" have been met.
The lease term is 30 years with an option to renew for an additional 10 years.

Contract to Construct a Manufacturing and Headquarters Facility

     On October 29, 1997, the Company  entered into an agreement with Commercial
Developments  International/West  (Design/Builder)  whereby Design/Builder shall
design  and  build  an  approximately  200,000  square  foot  manufacturing  and
headquarters  facility.  The  contract  sum for this project is "Cost plus Fixed
Fees" with a Guaranteed  Maximum Price of $6,300,000.  Any savings realized upon
completion  and  acceptance of the project will be shared by the  Design/Builder
and the Company.  The Company believes that the project will be completed in the
second quarter of 1998.


                                       12
<PAGE>
                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                           PART II - OTHER INFORMATION

Item 6.  Exhibits and Reports of Form 8-K

         (a)      Exhibits:


Exhibit No.       Description                                          
- -------------------------------------------------------------------------------

*    3.1          Certificate of Incorporation
**   3.2          Bylaws
*    3.3          Amendment to Certificate of Incorporation
*    4.1          Specimen Certificate of Class A Common Stock
*    4.2          Warrant Agreement (including form of Class A and 
                  Class B Warrant Certificates
*    4.3          Form of Underwriter's Unit Purchase Option
*   10.1          Form of Indemnification Agreement
**  10.2          Amended 1996 Stock Option Plan
*   10.3          Employment Agreement dated as of May 1, 1996 between 
                  the Company and Dr.  Carl L. Chen
*   10.4          Agreement of Merger dated July 16, 1996 between 
                  Advanced Aerodynamics and Structures, Inc., 
                  California corporation, and Advanced Aerodynamics 
                  & Structures, Inc., a Delaware corporation
**  10.5          Lease dated December 19, 1996 between Olen 
                  Properties Corp., a Florida corporation, and the Company
*** 10.6          Standard Sublease dated June 27, 1997 with Budget 
                  Rent-a-Car of Southern California
*** 10.7          Standard Sublease dated July 16, 1997 with Budget 
                  Rent-a-Car of Southern California
*** 10.8          Standard Industrial/Commercial Multi-Tenant Lease-Gross
                  dated March 12, 1997 with the Golgolab Family Trust
    10.9          Loan Agreement dated as of August 1, 1997 between the
                  Company and the California Economic Development Authoroity
    10.10         Indenture of Trust dated as of August 1, 1997 between 
                  the California Economic Development Authority and
                  First Trust of California, National Association
****10.11         Official Statement dated August 5, 1997
    10.12         Letter of Credit issued by The Sumitomo Bank, Limited
    10.13         Reimbursement Agreement dated as of August 1, 1997 
                  between the Company and The Sumitomo Bank, Limited
    10.14         Purchase Contract dated August 1, 1997 by and among
                  Rauscher Pierce Refnes, Inc., the California Economic
                  Development Authority and the Treasurer of the State
                  of California, and approved by the Company
    10.15         Remarketing Agreement dated as of August 1,1997
                  between the Company and Rauscher Pierce Refnes, Inc.
    10.16         Blanket Letters of Representations of the California
                  Economic Development Authority and First Trust of
                  California, National Association
    10.17         Tax Regulatory Agreement dated as of August 1, 1997
                  by and among the California Economic Development
                  Authority, the Company and First Trust of California,
                  National Association
    10.18         Custody, Pledge and Security Agreement dated as of August 1, 
                  1997 between the Company and The Sumitomo Bank, Limited
    10.19         Investment Agreement dated August 5, 1997 by and
                  between the Company and The Sumitomo Bank, Limited
    10.20         Specimen Direct Obligation Note between the Company
                  and The Sumitomo Bank, Limited
****10.21         Lease Agreement dated October 17, 1997 between the
                  Company and the City of Long Beach
****10.22         Construction Agreement dated October 29,1997 between the
                  Company and Commercial Developments International/West
    11.1          Statement re: Computation of Per Share Earnings
    27            Financial Data Schedule

   * Incorporated by reference to the Company's  Registration  Statement on Form
SB-2 (333-12273) declared effective by the Securities and Exchange Commission on
December 3, 1996.

   **  Incorporated  by reference to the  Company's  Report on Form 10-KSB filed
with the Securities and Exchange Commission on March 31, 1997.

   *** Incorporated by reference by the Company's Post-Effective Amendment No. 1
to Form SB-2  Registration  Statement  filed with the  Securities  and  Exchange
Commission on August 5, 1997.

   ****  Filed  by paper  pursuant  to the  Company's  request  for a  temporary
hardship exemption relating to this report.

         Reports on Form 8-K:

          During the quarter  ended  September  30, 1997,  the Company filed one
report on Form 8-K dated October 30, 1997 and  incorporated  by  reference.  The
Form 8-K was filed due to a change in the Company's independent accountant.


                                       13

<PAGE>


                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                                   SIGNATURES

         In accordance with the requirements of the Exchange Act, the Registrant
caused this report to be signed on its behalf by the undersigned, thereunto duly
authorized.

Dated:  November 14, 1997               ADVANCED AERODYNAMICS & STRUCTURES, INC.


                                        By: /s/ Carl L. Chen
                                           ------------------------------------
                                           Carl L. Chen, President


                                        By: /s/ Dave Turner
                                           ------------------------------------
                                           Dave Turner, Chief Financial Officer







                                       14


                                 LOAN AGREEMENT



                                 By and Between



               CALIFORNIA ECONOMIC DEVELOPMENT FINANCING AUTHORITY



                                       and



                   ADVANCED AERODYNAMICS AND STRUCTURES, INC.



                           Dated as of August 1, 1997







     All  right,  title and  interest  of the  CALIFORNIA  ECONOMIC  DEVELOPMENT
FINANCING  AUTHORITY (the  "Authority") in this Loan Agreement has been assigned
(except for amounts payable under Sections 4.2(b),  7.3, 9.2 and 9.3 hereof, its
right to receive notices,  opinions and other documents required to be delivered
to the  Authority  hereunder  and its rights to consent to certain  actions)  to
First Trust of  California,  National  Association,  as trustee (the  "Trustee")
pursuant  to the  Indenture  of Trust,  dated as of August 1, 1997,  between the
Authority and the Trustee, and is subject to such assignment.

<PAGE>

                                TABLE OF CONTENTS

PARTIES.................................................................  1
PREAMBLES...............................................................  1


                                    ARTICLE I

                                   DEFINITIONS

Section 1.1.         Definition of Terms...................................2
Section 1.2.         Number and Gender.....................................2
Section 1.3.         Articles, Sections, Etc...............................2


                                   ARTICLE II

                                 REPRESENTATIONS

Section 2.1.         Representations of the Authority......................2
Section 2.2.         Representations of the Borrower.......................3
Section 2.3.         Bondholders to Benefit................................5


                                   ARTICLE III

                          CONSTRUCTION OF THE PROJECT;
                              ISSUANCE OF THE BONDS

Section 3.1.         Construction of the Project...........................5
Section 3.2.         Disbursements from the Project Fund and Costs of
                         Issuance Fund.....................................6
Section 3.3.         Establishment of Completion Date; Obligation of
                         Borrower to Complete..............................6
Section 3.4.         Investment of Moneys in Funds.........................7

                                   ARTICLE IV

                     LOAN OF PROCEEDS; REPAYMENT PROVISIONS

Section 4.1.         Loan of Bond Proceeds; Issuance of Bonds..............7
Section 4.2.         Loan Repayments and Other Amounts Payable.............7
Section 4.3.         Purchase of Bonds.....................................9
Section 4.4.         Unconditional Obligations.............................9
Section 4.5.         Assignment of Authority's Rights......................10
Section 4.6.         Amounts Remaining in Funds............................10


                                       i
<PAGE>


                                    ARTICLE V

                        SPECIAL COVENANTS AND AGREEMENTS

Section 5.1.         Right of Access to the Project.......................10
Section 5.2.         The Borrower's Maintenance of its Existence..........10
Section 5.3.         Records and Financial Statements of Borrower;
                         Employment Practices.............................11
Section 5.4.         Insurance............................................12
Section 5.5.         Maintenance and Repair; Taxes; Utility and Other
                          Charges.........................................12
Section 5.6.         Qualification in California..........................12
Section 5.7.         Alternate Credit Facility............................12
Section 5.8.         Letter of Credit.....................................13
Section 5.9.         Covenants of the Authority and the Borrower..........14
Section 5.10.        Capital Expenditures.................................16
Section 5.11.        Special Arbitrage Certifications.....................18
Section 5.12.        Covenant to Enter into Agreement or Contract to
                         Provide Ongoing Disclosure.......................19



                                   ARTICLE VI

                      DAMAGE, DESTRUCTION AND CONDEMNATION;
                                 USE OF PROCEEDS

Section 6.1.         Obligation to Continue Payments......................19
Section 6.2.         Application of Net Proceeds..........................19
Section 6.3.         Insufficiency of Net Proceeds........................20
Section 6.4.         Damage to or Condemnation of Other Property..........20


                                   ARTICLE VII

                        LOAN DEFAULT EVENTS AND REMEDIES

Section 7.1.         Loan Default Events..................................20
Section 7.2.         Remedies on Default..................................21
Section 7.3.         Agreement to pay Attorneys' Fees and Expenses........23
Section 7.4.         No Remedy Exclusive..................................23
Section 7.5.         Waivers..............................................23

                                       ii
<PAGE>

                                  ARTICLE VIII

                                   PREPAYMENT

Section 8.1.         Redemption of Bonds with Prepayment Moneys...........23
Section 8.2.         Options to Prepay Loan...............................24
Section 8.3.         Mandatory Prepayment.................................24
Section 8.4.         Amount of Prepayment.................................25
Section 8.5.         Notice of Prepayment.................................26


                                   ARTICLE IX

              NON-LIABILITY OF AUTHORITY; EXPENSES; INDEMNIFICATION

Section 9.1.         Non-Liability of Authority...........................26
Section 9.2.         Expenses.............................................26
Section 9.3.         Indemnification......................................27


                                    ARTICLE X

                                  MISCELLANEOUS

Section 10.1.        Notices..............................................27
Section 10.2.        Severability.........................................28
Section 10.3.        Execution of Counterparts............................29
Section 10.4.        Amendments, Changes and Modifications................29
Section 10.5.        Governing Law........................................29
Section 10.6.        Authorized Representative of the Borrower............29
Section 10.7.        Term of the Agreement................................29
Section 10.8.        Binding Effect.......................................29
Section 10.9.        References to Bank...................................29
Section 10.10.       Brokerage Confirmations..............................30

Exhibit A - The Project                                                  A-1




                                      iii
<PAGE>

                                 LOAN AGREEMENT

     THIS LOAN  AGREEMENT,  dated as of August 1, 1997,  between the  CALIFORNIA
ECONOMIC  DEVELOPMENT  FINANCING AUTHORITY,  a body public and corporate,  and a
public  instrumentality  of the  State  of  California  (the  "Authority"),  and
ADVANCED  AERODYNAMICS  AND STRUCTURES,  INC., a corporation  duly organized and
validly existing under the laws of the State of California (the "Borrower").

                              W I T N E S S E T H:

     WHEREAS,  the  Authority was  established  for the purpose of promoting and
encouraging commerce and industry,  and generally to foster economic development
in the State of California  (the "State") and is authorized to issue  tax-exempt
revenue bonds to provide  financing for private  activity  economic  development
projects  pursuant to the  provisions of Section 15710 et seq. of the California
Government  Code  (constituting  Part  10.2  of  Division  3 of  Title  2 of the
Government Code of the State of California,  as now in effect and as it may from
time to time hereafter be amended or supplemented) (the "Act"); and

     WHEREAS,  in  furtherance of the purposes of the Authority set forth above,
the Authority proposes to finance the acquisition, construction, rehabilitation,
equipping,   installation,   improvement,   and  furnishing  of  the  industrial
facilities  described  in  Exhibit  A hereto  (the  "Project")  to be owned  and
operated by the Borrower; and

     WHEREAS,  pursuant to and in accordance with the provisions of the Act, the
Authority has authorized and undertaken the issuance of its California  Economic
Development  Financing  Authority  Variable Rate Demand  Industrial  Development
Revenue Bonds, Series 1997 (Advanced Aerodynamics and Structures,  Inc. Project)
(the  "Bonds") in the aggregate  principal  amount of Eight Million Five Hundred
Thousand  Dollars  ($8,500,000) to provide funds to pay a portion of the cost of
the Project and a portion of the costs of issuance of the Bonds; and

     WHEREAS,  the  Authority  proposes to loan the proceeds of the Bonds to the
Borrower,  and the Borrower desires to borrow the proceeds of the Bonds upon the
terms and conditions set forth herein; and

     WHEREAS,  for and in consideration of such loan, the Borrower agrees, inter
alia, to make loan payments  sufficient to pay on the dates specified in Section
4.2 hereof, the principal of, premium, if any, and interest on, the Bonds; and

     WHEREAS,  the  Authority  and the  Borrower  each has duly  authorized  the
execution and delivery of this Agreement;

     NOW,  THEREFORE,  for and in consideration of the premises and the material
covenants  hereinafter  contained,  the parties hereto hereby formally covenant,
agree and bind themselves as follows:
<PAGE>


                                    ARTICLE I

                                   DEFINITIONS

     Section 1.1.  Definition of Terms.  Unless otherwise  defined herein or the
context  otherwise  requires,  the terms used in this  Agreement  shall have the
meanings specified in Section 1.01 of the Indenture of Trust, dated as of August
1, 1997 (the  "Indenture"),  by and  between  the  Authority  and First Trust of
California,  National  Association,  as trustee (the  "Trustee"),  as originally
executed or as it may from time to time be  supplemented  or amended as provided
therein.

     Section 1.2. Number and Gender.  The singular form of any word used herein,
including the terms defined in Section 1.01 of the Indenture,  shall include the
plural, and vice versa. The use herein of a word of any gender shall include all
genders.

     Section  1.3.  Articles,   Sections,   Etc.  Unless  otherwise   specified,
references to Articles, Sections and other subdivisions in this Agreement are to
the designated  Articles,  Sections and other  subdivisions of this Agreement as
amended from time to time. The words "hereof,"  "herein,"  "hereunder" and words
of similar import refer to this Agreement as a whole.  The headings or titles of
the several  Articles and Sections,  and the table of contents  included herein,
shall be solely for  convenience  of reference and shall not affect the meaning,
construction or effect of the provisions hereof.


                                   ARTICLE II

                                 REPRESENTATIONS

     Section 2.1.  Representations  of the  Authority.  The Authority  makes the
following representations as the basis for its undertakings herein contained:

     (a)  The  Authority  is  a  body  public  and   corporate,   and  a  public
instrumentality of the State. Under the provisions of the Act, the Authority has
the power to enter into the transactions  contemplated by this Agreement and the
Indenture and to carry out its  obligations  hereunder.  By proper  action,  the
Authority  has been duly  authorized  to execute,  deliver and duly  perform its
obligations under this Agreement and the Indenture.

     (b) To finance the Costs of the Project and certain Costs of Issuance,  the
Authority will issue the Bonds, which will mature,  bear interest and be subject
to redemption as set forth in the Indenture.

     (c) The Bonds will be issued under and secured by the  Indenture,  pursuant
to which the  Authority's  interest in this Agreement  (except certain rights of
the Authority to payment for expenses and  indemnification)  will be pledged and
assigned to the Trustee as security for payment of the principal of, premium, if
any, and interest on the Bonds

                                        2

<PAGE>



and to the Bank, on a basis subordinate  thereto, as security for the payment of
the obligations of the Borrower under the Reimbursement Agreement.

     (d) The  Authority has not pledged and will not pledge its interest in this
Agreement for any purpose other than to secure the Bonds under the Indenture and
the obligations of the Borrower under the Reimbursement Agreement.

     (e) The Authority is not in default under any of the provisions of the laws
of the State which default would affect its existence or its powers  referred to
in subsection (a) of this Section 2.1.

     (f) The Authority has found and  determined and hereby finds and determines
that (i) the Loan to be made  hereunder  with the  proceeds  of the  Bonds  will
promote the purposes of the Act by providing  funds to finance the  Construction
of the  Project;  (ii) said Loan is in the  public  interest,  serves the public
purposes  and meets the  requirements  of the Act; and (iii) the portion of such
Loan  allocable  to the Costs of the  Project  does not  exceed  the total  cost
thereof as determined by the Borrower and approved by the Authority.

     (g) No member, officer or other official of the Authority has any financial
interest whatsoever in the Borrower or in the transactions  contemplated by this
Agreement and the Indenture.

     (h) Neither the execution and delivery of this  Agreement,  the  Indenture,
the Purchase Contract or the Tax Regulatory  Agreement,  the consummation of the
transactions   contemplated  hereby  or  thereby,  nor  the  fulfillment  of  or
compliance with the terms and conditions of this Agreement,  the Indenture,  the
Purchase Contract or the Tax Regulatory Agreement,  conflict with or result in a
breach of any of the terms,  conditions or provisions of any  restriction or any
agreement or  instrument to which the Authority is now a party or by which it is
bound or  constitute  a  default  under  any of the  foregoing  or result in the
creation or imposition of any  prohibited  lien,  charge or  encumbrance  of any
nature  whatsoever upon any of the property or assets of the Authority under the
terms of any instrument or agreement.

     Section  2.2.  Representations  of the  Borrower.  The  Borrower  makes the
following representations as the basis for its undertakings herein contained:

     (a)  The  Borrower  is a  Delaware  corporation,  duly  organized,  validly
existing and in good standing  under the laws of the State of Delaware and is in
good standing and duly  qualified to transact  business in the State,  is not in
violation of any provision of any of the Borrower's Organization Documents,  has
full power and authority to enter into this  Agreement,  and has duly authorized
the execution and delivery of this Agreement by proper action.

     (b)  The  execution,  delivery  and  performance  by the  Borrower  of this
Agreement,  the  Reimbursement  Agreement,  the Remarketing  Agreement,  the Tax


                                       3
<PAGE>

Regulatory Agreement and all other documents  contemplated hereby to be executed
by the Borrower are within the Borrower's power and have been duly authorized by
all necessary action,  and neither the execution and delivery of this Agreement,
the  Reimbursement  Agreement,  the Remarketing  Agreement or the Tax Regulatory
Agreement  or the  consummation  of the  transactions  contemplated  hereby  and
thereby,  nor the  fulfillment  of or compliance  with the terms and  conditions
hereof and thereof,  conflicts  with or results in a breach of any of the terms,
conditions or provisions of any of the Borrower's  Organization Documents, or of
any law, statute,  rule,  regulation,  order, judgment,  award,  injunction,  or
decree or of any agreement or instrument to which the Borrower is now a party or
by which it is bound or affected,  or constitutes a default (or would constitute
a default  with due  notice  or the  passage  of time or both)  under any of the
foregoing,  or  results  in or  requires  the  creation  or  imposition  of  any
prohibited  lien,  charge or encumbrance  whatsoever upon any of the property or
assets of the Borrower  under the terms of any  instrument or agreement to which
the Borrower is now a party or by which it is bound.

     (c)  The  estimated  Costs  of the  Project  are as set  forth  in the  Tax
Regulatory   Agreement  and  have  been  determined  in  accordance  with  sound
engineering,  construction,  and accounting principles.  All the information and
representations  in the Tax Regulatory  Agreement are true and correct as of the
date thereof.

     (d) The Project consists and will consist of those facilities  described in
Exhibit A and the  Borrower  shall not make any changes to the Project or to the
operation  thereof which would affect the qualification of the Project under the
Act or would cause  interest  on the Bonds not to be  Tax-exempt.  The  Borrower
intends to own and operate the  Project.  The Borrower  covenants  and agrees to
operate or cause the operation of the Project as a facility described by the Act
until the principal of, the premium, if any, and the interest on the Bonds shall
have been paid.

     (e) The  Borrower  has and will  have  title to the  Project  (including  a
leasehold  interest in the land on which the Project is located)  sufficient  to
carry out the purposes of this Agreement.

     (f) At the  time of  submission  of an  application  to the  Authority  for
financial  assistance in  connection  with the Project and on the dates on which
action was taken on such  application,  permanent  financing for the Project had
not otherwise been obtained or arranged.

     (g) To the best  knowledge  of the  Borrower,  no member,  officer or other
official of the Authority has any financial interest  whatsoever in the Borrower
or in the transactions contemplated by this Agreement.

     (h) All certificates, approvals, permits and authorizations with respect to
the  Construction  of  the  Project  of the  State,  the  City  of  Long  Beach,
California,  the federal  government  and other  applicable  local  governmental
agencies have been obtained, or if not yet obtained,  are reasonably expected to
be obtained in due course.  The Project  will be  consistent  with any  existing
local or regional comprehensive plan.


                                        4

<PAGE>




                  (i) No event has occurred and no condition  exists which would
         constitute a Loan Default  Event or which,  with the passing of time or
         with the  giving of notice or both,  would  constitute  a Loan  Default
         Event.

                  (j) There is no litigation  or  proceeding  pending or, to the
         knowledge of the Borrower, threatened, against the Borrower which could
         adversely  affect the  validity of this  Agreement,  the  Reimbursement
         Agreement, the Remarketing Agreement or the Tax Regulatory Agreement or
         the ability of the Borrower to comply with the terms of its obligations
         under this  Agreement,  the  Reimbursement  Agreement,  the Remarketing
         Agreement or the Tax Regulatory Agreement.

                  (k)  No  consent,   authorization  or  approval,  except  such
         consents authorizations or approvals as have been obtained prior to the
         execution and delivery of this Agreement, from any governmental, public
         or quasi-public  body or authority of the United States or of the State
         or any department or  subdivision of any thereof,  is necessary for the
         due execution and delivery by the Borrower of this Agreement.

     Section  2.3.  Bondholders  to  Benefit.  The  Borrower  agrees  that  this
Agreement  is  executed  in part to induce the  purchase by others of the Bonds.
Accordingly,  all covenants and agreements on the part of the Borrower set forth
in this Agreement are hereby  declared to be for the benefit of the  Bondholders
from time to time of such Bonds;  provided,  however,  that such  covenants  and
agreements  shall create no rights in any parties other than the Authority,  the
Borrower,  the Remarketing  Agent,  the Bank, the Trustee,  the Tender Agent and
such Bondholders.


                                   ARTICLE III

                          CONSTRUCTION OF THE PROJECT;
                              ISSUANCE OF THE BONDS

     Section  3.1.  Construction  of the  Project.  The  Borrower  agrees  that,
utilizing  the proceeds of the Bonds  loaned  pursuant to Section 4.1 hereof and
such other funds as may be necessary,  it has or will Construct,  or has or will
cause the Construction of, the Project,  and has or will acquire,  rehabilitate,
equip, construct and install all other facilities and real and personal property
necessary  for the  operation  of the  Project as  described  in the  Borrower's
application   to  the  Authority  for   assistance  in  financing  the  Project,
substantially in accordance with the plans and specifications  prepared therefor
by the Borrower,  including any and all  supplements,  amendments,  additions or
deletions  thereto or therefrom,  it being  understood  that the approval of the
Authority  shall not be required  for  changes in such plans and  specifications
which do not alter the  purpose or  description  of the  Project as set forth in
Exhibit A hereto.  The Borrower  further agrees to proceed with due diligence to
complete the Project within three years from the date hereof.

     In the event that the  Borrower  desires to modify the  Project in a manner
which alters the purpose or description of the Project as set forth in Exhibit A
hereto, such


                                        5

<PAGE>



modification shall be undertaken only upon an amendment to Exhibit A which shall
accurately set forth the  description  and purpose of the Project as so modified
and which  amendment  to Exhibit A shall  become  effective  upon receipt by the
Authority and the Trustee of:

                           (i) a certificate of the Authorized Representative of
         the Borrower describing in detail the proposed changes and stating that
         they  will  not have the  effect  of  disqualifying  the  Project  as a
         facility  that  may be  financed  pursuant  to the Act nor  reduce  the
         employment  benefits  described in the  Borrower's  application  to the
         Authority for assistance in financing the Project;

                           (ii) an opinion  of Bond  Counsel  that the  proposed
         changes to the Project  will not have the effect of  disqualifying  the
         Project as a facility that may be financed pursuant to the Act or cause
         interest on the Bonds to not be Tax-exempt;

                           (iii)  a copy of the  proposed  form  of  amended  or
         supplemented Exhibit A hereto; and

                           (iv)  the  written  approval  of  the  Bank  and  the
Trustee.

     Section  3.2.  Disbursements  from the  Project  Fund and Costs of Issuance
Fund. The Borrower will authorize and direct the Trustee,  upon  compliance with
Section 3.03 of the Indenture,  to disburse the moneys in the Project Fund to or
on behalf of the Borrower only for payment of Costs of the Project.  Each of the
payments  from the Project Fund  referred to in this Section  shall be made upon
receipt  by the  Trustee  of a written  Requisition  in the form  prescribed  by
Section 3.03 of the Indenture,  signed by the Authorized  Representative  of the
Borrower accompanied by the written approval of the Bank.

     Moneys in the Costs of Issuance  Fund shall be  disbursed by the Trustee as
provided in Section 3.03(E) of the Indenture to pay Costs of Issuance.

     Section 3.3.  Establishment of Completion  Date;  Obligation of Borrower to
Complete. As soon as the Construction of the Project is completed, an Authorized
Representative  of the Borrower,  on behalf of the Borrower,  shall evidence the
completion  date by providing a certificate  to the Trustee,  with a copy to the
Authority,  stating  the  Costs of the  Project  and  further  stating  that (i)
Construction of the Project has been completed  substantially in accordance with
the plans and specifications  therefor, and all labor,  services,  materials and
supplies used in Construction  have been paid for or stating the amount required
to be retained in the Project Fund to fully  provide for any  disputed  amounts,
and (ii) all other  equipment  and  facilities  for the operation of the Project
have been acquired,  constructed  and installed in accordance with the plans and
specifications  therefor  and all  costs and  expenses  incurred  in  connection
therewith have been paid or provided for.  Notwithstanding  the foregoing,  such
certificate  may state that it is given  without  prejudice to any rights of the
Borrower against third parties.

     At the time such certificate is delivered to the Trustee,  moneys remaining
in the  Project  Fund,  less  an  amount  representing  a  reasonable  retainage
determined by the Borrower,

                                        6

<PAGE>



including any earnings  resulting from the  investment of such moneys,  shall be
used as provided in Section 3.03(D) of the Indenture.

     In the event the moneys in the Project  Fund  available  for payment of the
Costs of the Project should be  insufficient  to pay the Costs of the Project in
full,  the Borrower  agrees to pay  directly,  or to deposit in the Project Fund
moneys  sufficient  to pay,  any costs of  completing  the  Construction  of the
Project in excess of the moneys  available for such purpose in the Project Fund,
or  otherwise  cause  the  Construction  of the  Project  to be  completed.  The
Authority makes no express or implied  warranty that the moneys deposited in the
Project  Fund and  available  for payment of the Costs of the Project  under the
provisions of this Agreement will be sufficient to pay all the amounts which may
be incurred in connection  with the  Construction  of the Project.  The Borrower
agrees that if, after exhaustion of the moneys in the Project Fund, the Borrower
should  pay,  or deposit  moneys in the  Project  Fund for the  payment  of, any
portion of the Costs of the Project  pursuant to the provisions of this Section,
it shall not be entitled to any reimbursement  therefor from the Authority,  the
Trustee  or the  Holders of any of the Bonds,  nor shall it be  entitled  to any
diminution of the amounts payable under Section 4.2.

     Section 3.4.  Investment of Moneys in Funds. Any moneys in any fund held by
the Trustee shall, at the written request of an Authorized Representative of the
Borrower,  but  subject to the  restrictions  on  investments  contained  in the
Indenture,  the Tax Regulatory  Agreement and applicable law in connection  with
the Tax-exempt status of interest on the Bonds, be invested or reinvested by the
Trustee as  provided in the  Indenture.  Such  investments  shall be held by the
Trustee  and shall be deemed  at all  times a part of the fund from  which  such
investments were made, and the interest accruing thereon, and any profit or loss
realized therefrom,  shall be credited or charged as provided in Section 5.05 of
the Indenture.


                                   ARTICLE IV

                     LOAN OF PROCEEDS; REPAYMENT PROVISIONS

     Section  4.1.  Loan of Bond  Proceeds;  Issuance  of Bonds.  The  Authority
covenants and agrees,  upon the terms and conditions in this Agreement,  to loan
the  proceeds  of the  sale of the  Bonds to the  Borrower  for the  purpose  of
financing  the Costs of the  Project  and the Costs of  Issuance  to the  extent
permitted  by the  Indenture.  Pursuant  to said  covenant  and  agreement,  the
Authority will issue the Bonds upon the terms and  conditions  contained in this
Agreement  and the  Indenture  and will cause the Bond proceeds to be applied as
provided in Article III of the Indenture.  Except as provided in Section 3.02 of
the Indenture,  such proceeds shall be disbursed to or on behalf of the Borrower
as provided in Section 3.2 hereof.  The Borrower  hereby approves the Indenture,
the assignment thereunder to the Trustee of the right, title and interest of the
Authority  (with  certain  exceptions)  in  this  Agreement,  and  the  issuance
thereunder by the Authority of the Bonds.

     Section 4.2. Loan  Repayments and Other Amounts  Payable.  (a) On or before
each Bond Payment Date, until the principal of, premium, if any, and interest on
the Bonds shall have been fully paid or provision  for such  payment  shall have
been made as provided in


                                        7

<PAGE>



the Indenture, the Borrower covenants and agrees to pay to the Trustee as a Loan
Repayment  on the Loan made to the  Borrower  from  Bond  proceeds  pursuant  to
Section  4.1, a sum equal to the amount  payable  on such Bond  Payment  Date as
principal of, and premium,  if any, and interest on the Bonds as provided in the
Indenture.

     The Loan Repayments made pursuant to this subsection (a) shall at all times
be  sufficient  to pay the total  amount of interest and  principal  (whether at
maturity or upon redemption or acceleration)  and premium,  if any, becoming due
and payable on the Bonds on each Bond  Payment  Date;  provided  that any amount
held by the  Trustee in the  Revenue  Fund on the due date for a Loan  Repayment
pursuant to the immediately  preceding  paragraph shall be credited  against the
Loan  Repayment due on such date to the extent  available for such purpose under
the terms of the Indenture; and provided further that, subject to the provisions
of this paragraph, if at any time the amounts held by the Trustee in the Revenue
Fund are sufficient to pay all of the principal of and interest and premium,  if
any, on the Bonds as such payments become due, the Borrower shall be relieved of
any obligation to make any further Loan Repayments  under the provisions of this
Section.  Notwithstanding  the foregoing,  if on any date the amount held by the
Trustee in the Revenue Fund is  insufficient  to make any  required  payments of
principal  of  (whether  at maturity or upon  redemption  or  acceleration)  and
interest  and  premium,  if any, on the Bonds as such  payments  become due, the
Borrower,  immediately  upon  receipt  of  notice  of such  deficiency  from the
Trustee, shall forthwith pay such deficiency as a Loan Repayment hereunder.

     The  obligation of the Borrower to make any payment  under this  subsection
(a) shall be deemed to have been  satisfied  to the extent of any  corresponding
payment  made by the Bank to the  Trustee  as a result  of a  drawing  under the
Letter of Credit.  To the extent the Trustee  receives a Loan Repayment from the
Borrower pursuant to this subsection (a) after any payment obligation  hereunder
has been  satisfied by a drawing  under the Letter of Credit,  the Trustee shall
use such Loan Repayment to reimburse the Bank for such drawing.

     (b) The  Borrower  covenants  and  agrees to pay until  the  principal  of,
premium,  if any,  and  interest  on the Bonds  shall  have been  fully  paid or
provision  for such payment  shall have been made as provided in the  Indenture,
(i) the Trustee's  reasonable  annual fee for its ordinary  services rendered as
trustee,  and its reasonable ordinary expenses incurred under the Indenture,  as
and when the same become due, (ii) the Trustee's  reasonable  fees,  charges and
expenses,  as Bond Registrar,  Tender Agent and Paying Agent, and the reasonable
fees of any other  paying agent for the Bonds as provided in the  Indenture,  as
and when the same become due,  (iii) the cost of providing any Bonds required to
be provided  pursuant to the Indenture,  (iv) the reasonable  fees of any rating
agency then rating the Bonds  required to maintain the rating on the Bonds,  (v)
the  reasonable  fees of the  Remarketing  Agent,  and (vi) other  necessary and
ordinary  administrative  fees  and  expenses  of the  Authority.  The  Borrower
covenants  and agrees to make all payments for the  expenses  identified  in (i)
through (vi) above. In addition,  the Borrower agrees to pay such  extraordinary
expenses  incurred by the Trustee,  the Tender Agent, the Remarketing  Agent and
the Authority under the Indenture as and when the same become due. The duties of
the Borrower  under this  subsection  (b) shall survive the  termination of this
Agreement and the termination and discharge of the Indenture.



                                        8

<PAGE>



     (c) The  Borrower  also agrees to pay the fees of the Bank  pursuant to the
Reimbursement Agreement.

     (d) In the  event  the  Borrower  should  fail to make any of the  payments
required by subsections (a)-(c) of this Section, such payments shall continue as
obligations  of the  Borrower  until such  amounts  shall have been fully  paid.
Except  as  provided  in the next  sentence,  the  Borrower  agrees  to pay such
amounts,  together with interest  thereon,  from the date such payments were due
until paid, to the extent permitted by law, at the rate of ten percent (10%) per
annum.  With respect to amounts due the Bank,  the  Borrower  agrees to pay such
amounts  together  with  interest  thereon  at the rates  and times  established
pursuant to the Reimbursement  Agreement.  Interest on overdue payments required
under  subsection  (a) above shall be paid to Bondholders as provided in Section
2.02(B)(2) of the Indenture.

     Section 4.3.  Purchase of Bonds. The Borrower hereby  recognizes and agrees
that the  Indenture  provides  for the  creation  of an account or  accounts  to
facilitate  the  purchase of Bonds by the Tender Agent on the  Mandatory  Tender
Date and upon the optional  tender of Bonds in  accordance  with Section 4.06 of
the  Indenture,  and the Borrower  agrees to provide or cause to be provided the
Letter of Credit for the payment of amounts necessary to purchase such Bonds.

     Section 4.4. Unconditional Obligations.  The obligations of the Borrower to
make the  payments  required by Section 4.2 hereof and to provide or cause to be
provided the Letter of Credit pursuant to Section 4.3 hereof, and to perform and
observe the other agreements on its part contained herein, shall be absolute and
unconditional,  irrespective of any defense or any rights of set-off, recoupment
or counterclaim  it might  otherwise have against the Authority,  and during the
term of this  Agreement,  the Borrower  shall pay  absolutely all payments to be
made on account of the Loan made to the Borrower from Bond proceeds  pursuant to
Section 4.1 hereof,  as  prescribed  in Section 4.2 hereof,  the  obligation  to
provide or cause to be  provided  the Letter of Credit  pursuant  to Section 4.3
hereof,  and all other payments required  hereunder,  free of any deductions and
without abatement,  diminution or set-off.  Until such time as the principal of,
premium,  if any,  and  interest  on the Bonds  shall have been fully  paid,  or
provision  for the  payment  thereof  shall  have been made as  required  by the
Indenture,  the  Borrower  (i) will not  suspend  or  discontinue  any  payments
required  to be made by the  Borrower  pursuant  to this  Agreement,  including,
without limitation,  the payments provided for in Section 4.2 and the obligation
to provide or cause to be provided the Letter of Credit pursuant to Section 4.3;
(ii) will  perform  and  observe all of its other  covenants  contained  in this
Agreement;  and (iii)  except as  provided  in  Article  VIII  hereof,  will not
terminate this Agreement for any cause, including,  without limitation,  failure
to complete the Project,  the  occurrence of any act or  circumstances  that may
constitute  failure of  consideration,  destruction of or damage to the Project,
commercial  frustration  of purpose,  any change in the tax or other laws of the
United States of America or of the State, or any political subdivision of either
of these,  or any failure of the Authority or the Trustee to perform and observe
any covenant,  whether express or implied, or any duty,  liability or obligation
arising out of or connected with this Agreement or the Indenture.



                                        9

<PAGE>



     Section 4.5.  Assignment of Authority's Rights. As security for the payment
of the Bonds,  the Authority will assign to the Trustee the Authority's  rights,
title and interest under this Agreement, including the right to receive payments
hereunder  (except the right of the Authority to receive  certain  payments,  if
any, with respect to expenses and  indemnification  under Sections 4.2(b),  7.3,
9.2 and 9.3 hereof, the Authority's right to receive notices, opinions and other
documents  required  to  be  delivered  to  the  Authority   hereunder  and  the
Authority's  rights to consent  to certain  actions  taken  hereunder),  and the
Authority  hereby directs the Borrower to make the payments  required  hereunder
(except such payments for expenses and indemnification)  directly to the Trustee
as more fully set forth in this  Agreement.  The Borrower hereby assents to such
assignment, agrees to make such payments directly to the Trustee and agrees that
the  provisions  of  Section  4.4  shall  apply to its  obligation  to make such
payments.

     Section 4.6. Amounts Remaining in Funds. It is agreed by the parties hereto
that after:  (i) payment in full of the principal  of, and premium,  if any, and
interest on, the Bonds, or after provision for such payment shall have been made
as  provided  in  the  Indenture,   (ii)  payment,   or  provision  for  payment
satisfactory to the Trustee and paying agents, of the fees, charges and expenses
of the  Trustee  and  paying  agents in  accordance  with the  Indenture,  (iii)
payment,  or provision for payment  satisfactory to the affected parties, of all
other amounts  required to be paid under this Agreement and the Indenture by the
Borrower  and (iv)  payment to the Bank of any  amounts  owed to the Bank by the
Borrower under the  Reimbursement  Agreement,  any amounts remaining in any fund
held by the Trustee  under the Indenture  shall be paid in  accordance  with the
requirements of Section 10.04 of the Indenture.


                                    ARTICLE V

                        SPECIAL COVENANTS AND AGREEMENTS

     Section  5.1.  Right of Access to the  Project.  The  Borrower  agrees that
during the term of this  Agreement,  the  Authority,  the  Trustee  and the duly
authorized  agents of either of them  shall  have the  right,  after  reasonable
notice to the Borrower,  at all reasonable times during normal business hours to
enter upon the site of the  Project to examine  and  inspect  the  Project.  The
rights of access hereby reserved to the Trustee,  and their  respective  agents,
may be exercised  only after the Person  seeking such access shall have executed
such  confidentiality or secrecy agreements,  if any, as may be requested by the
Borrower and which are in the form required of all visitors to the Project site.
Nothing  contained in this Section or in any other  provision of this  Agreement
shall be construed to entitle the Authority or the Trustee to any information or
inspection  involving the confidential  knowledge,  expertise or know-how of the
Borrower.

     Section 5.2. The  Borrower's  Maintenance  of its  Existence.  The Borrower
covenants  and agrees that it will maintain its existence and will not dissolve,
sell,  or  otherwise  dispose of all or  substantially  all of its  assets,  nor
consolidate  with or merge  into  another  entity  or permit  one or more  other
entities to consolidate  with or merge into it.  Notwithstanding  the foregoing,
the Borrower may,  without  violating  the covenants  contained in this Section,
consolidate  with or merge  into  another  entity,  or permit  one or more other
entities to consolidate


                                       10

<PAGE>



with or merge into it, or sell or  otherwise  transfer to another  entity all or
substantially all of its assets as an entirety and thereafter dissolve, if:

     (a) The surviving, resulting or transferee entity, as the case may be:

                           (i)  assumes in  writing,  if such  entity is not the
                  Borrower,  all of the  obligations  of the Borrower under this
                  Agreement;

                           (ii) is not,  after such  transaction,  otherwise  in
                  default under any provisions of this Agreement;

     (b) The Trustee and the  Authority  shall have  received an opinion of Bond
Counsel to the effect that such merger,  consolidation,  sale or other  transfer
will not cause interest on the Bonds not to be Tax-exempt; and

     (c) The  written  consent  of the Bank has been  received  by the  Trustee,
together with an acknowledgment that the Letter of Credit will remain in effect.

     If a merger, consolidation, sale or other transfer is effected, as provided
in this Section, the provisions of this Section shall continue in full force and
effect and no further merger, consolidation,  sale or transfer shall be effected
except in accordance with the provisions of this Section.

     Section 5.3.  Records and  Financial  Statements  of  Borrower;  Employment
Practices.

     (a) The Borrower  covenants and agrees at all times to keep, or cause to be
kept, proper books of record and account,  prepared in accordance with generally
accepted accounting principles,  in which complete and accurate entries shall be
made of all  transactions  of or in relation  to the  business,  properties  and
operations of the Borrower.  Such books of record and account shall be available
for inspection by the Authority or the Trustee,  and the duly authorized  agents
of either of them, at reasonable hours and under reasonable circumstances.

     (b) Upon  the  receipt  of the  written  request  of the  Authority  or the
Trustee,  the Borrower  further  covenants and agrees to furnish the  requesting
party,  within one hundred  twenty (120) days after the end of each Fiscal Year,
with copies of its complete financial  statements together with a Certificate of
an  Authorized  Representative  of the  Borrower  stating  that no  event  which
constitutes  a Loan  Default  Event or which  with the  giving  of notice or the
passage of time or both would  constitute a Loan Default  Event has occurred and
is continuing  as of the end of such Fiscal Year,  or  specifying  the nature of
such event and the actions  taken and  proposed  to be taken by the  Borrower to
cure such default.

     (c) The Borrower shall,  within sixty (60) days of the receipt of a written
request  from the  Authority  or the  Trustee,  furnish a written  report to the
requesting party, as of


                                                        11

<PAGE>



the end of the Borrower's prior Fiscal Year,  stating the status of the Project,
the  outstanding  and unpaid  balance of the Bonds,  the number of full-time and
part-time  employees of the Borrower  employed at the Project  during such prior
Fiscal Year,  and supplying  such current  information  as the  Authority  shall
reasonably request regarding other matters covered in the Borrower's application
for industrial revenue bond financing.

     Section 5.4. Insurance.  The Borrower agrees to insure the Project or cause
the Project to be insured during the term of this Agreement for such amounts and
for such occurrences as are customary for similar  facilities  within the State,
or as may be required  by the Bank,  by means of  policies  issued by  reputable
insurance  companies  qualified  to do business  in the State.  Upon the written
request of the  Authority or the  Trustee,  the  Borrower  shall  deliver to the
requesting  party,  within  sixty  (60)  days of the  receipt  of such  request,
memorandum  copies of the insurance  policies or certificates of insurance which
memorandum  copies of insurance  policies or  certificates  of  insurance  shall
evidence that all insurance  required to be in effect under this Section is then
currently  in full force and  effect.  The  Trustee  and the  Authority  are not
responsible  for the adequacy or sufficiency  of the coverage  evidenced by such
policies or certificates.

     Section 5.5. Maintenance and Repair;  Taxes; Utility and Other Charges. The
Borrower agrees to maintain the Project,  or cause the Project to be maintained,
during  the  term of this  Agreement  (i) in a safe  condition  and (ii) in good
repair and in good operating condition,  ordinary wear and tear excepted, making
from time to time all necessary  repairs  thereto and renewals and  replacements
thereof.

     The  Borrower  agrees  to pay or cause to be paid  during  the term of this
Agreement  all taxes,  governmental  charges of any kind  lawfully  assessed  or
levied upon the Project or any part thereof,  including any taxes levied against
the Project which, if not paid, will become a charge on the Project, all utility
and other charges  incurred in the operation,  maintenance,  use,  occupancy and
upkeep of the  Project and all  assessments  and  charges  lawfully  made by any
governmental  body for public  improvements that may be secured by a lien on the
Project; provided that with respect to special assessments or other governmental
charges that may lawfully be paid in  installments  over a period of years,  the
Borrower shall be obligated to pay only such  installments as are required to be
paid during the term of this  Agreement.  The  Borrower  may, at the  Borrower's
expense  and in the  Borrower's  name,  in good  faith,  contest any such taxes,
assessments and other charges and, in the event of any such contest,  may permit
the taxes,  assessments  or other  charges so contested to remain  unpaid during
that period of such contest and any appeal  therefrom  unless by such nonpayment
the Project or any part thereof will be subject to loss or forfeiture.

     Section  5.6.  Qualification  in  California.   The  Borrower  agrees  that
throughout the term of this Agreement it, or any successor  permitted by Section
5.2, will be qualified to do business in the State.

     Section 5.7.  Alternate  Credit  Facility.  If the Borrower  exercises  its
option to convert the interest rate borne by the Bonds from the Weekly  Interest
Rate to the Fixed Interest


                                       12

<PAGE>



Rate  pursuant to the terms and  provisions of the  Indenture,  the Borrower may
cause to be delivered to the Trustee an Alternate Credit Facility,  effective as
of the Fixed  Rate  Date,  in lieu of  keeping  the Letter of Credit in place as
required by Section 5.8.

     Such Alternate Credit Facility must meet the following conditions:

     (a) the Alternate  Credit Facility must be approved by the Authority or any
successors;

     (b)  the  terms  of  the   Alternate   Credit   Facility  must  provide  an
unconditional  obligation of the issuer of the Alternate  Credit Facility to pay
all amounts with respect to the principal of,  premium,  if any, and interest on
the Bonds when the same shall become due; and

     (c) the term of the  Alternate  Credit  Facility  must  extend to the final
maturity of the Bonds.

     On or prior to the date of the delivery of an Alternate  Credit Facility to
the Trustee,  the Borrower  shall cause to be furnished to the Authority and the
Trustee  (i) an  opinion  of Bond  Counsel  stating  that the  delivery  of such
Alternate  Credit Facility to the Trustee is authorized under this Agreement and
complies  with the terms hereof and will not cause  interest on the Bonds not to
be Tax-exempt, (ii) such opinions regarding the validity of the Alternate Credit
Facility as the  Authority,  the  Trustee and any rating  agency then rating the
Bonds may reasonably  require,  and (iii) written evidence from Moody's,  if the
Bonds are then rated by Moody's, and S&P, if the Bonds are then rated by S&P, to
the effect that such rating  agency has reviewed the proposed  Alternate  Credit
Facility and that the substitution of the proposed Alternate Credit Facility for
the Letter of Credit will not, by itself, result in a reduction of its long term
rating of the Bonds below "A" if the bonds are rated by S&P or below "A2" if the
Bonds are rated by Moody's.

     Section 5.8. Letter of Credit.  The Borrower shall at all times  throughout
the term of this  Agreement (but subject to Section 5.7) maintain or cause to be
maintained the Letter of Credit with respect to the Bonds.  The Letter of Credit
shall be an obligation of the Bank to pay to the Trustee,  against  presentation
of sight drafts and certificates required by the Bank, up to (x) an amount equal
to the aggregate  principal amount of the Bonds then Outstanding as necessary to
pay the principal of such Bonds, whether at maturity,  redemption,  acceleration
or otherwise or upon the purchase of such Bonds upon the optional  tender of the
Bonds  pursuant to Section 4.06 of the  Indenture  and on the  Mandatory  Tender
Date, and (y) an amount equal to 45 days (or such other number of days as may be
required  to  obtain a rating  on the  Bonds if the  Bonds  are then  rated)  of
interest on the Bonds calculated at an interest rate of twelve percent (12%) per
annum on the basis of a 365- or 366-day year, as  applicable,  for the number of
days actually  elapsed while the Bonds bear interest at the Weekly Interest Rate
and an amount equal to 210 days (or such other number of days as may be required
to obtain a rating on the Bonds if the Bonds are then  rated) of interest on the
Bonds  calculated at the actual interest rate or rates on the Bonds on the basis
of a 360-day year of twelve  30-day  months while the Bonds bear interest at the
Fixed Interest Rate to pay interest on the Bonds when due.


                                       13

<PAGE>




     On any Interest Payment Date, the Borrower may, at its option, but with the
written  approval  of  the  Authority,  which  written  approval  shall  not  be
unreasonably  withheld,  provide  or  cause to be  provided  to the  Trustee  an
Alternate  Letter of Credit and the Borrower  shall,  in any event,  cause to be
delivered to the Trustee an extension  of the  Expiration  Date of the Letter of
Credit or an  Alternate  Letter of  Credit at least (i)  twenty-three  (23) days
before the Expiration Date of the then-existing Letter of Credit while the Bonds
bear interest at the Weekly  Interest Rate, or (ii)  forty-five (45) days before
the Expiration  Date of the then existing  Letter of Credit while the Bonds bear
interest  at the Fixed  Interest  Rate.  At least  thirty (30) days prior to the
Letter of Credit  Substitution  Date,  the Borrower shall provide the Authority,
the Trustee, the Bank, the Tender Agent and the Remarketing Agent with a written
notice of its  intention  to provide an Alternate  Letter of Credit  pursuant to
this  Section  5.8.  Such notice  shall  include the  proposed  Letter of Credit
Substitution  Date,  which shall be an Interest  Payment Date,  and identify the
provider of the Alternate Letter of Credit.  An Alternate Letter of Credit shall
be an  irrevocable  letter  of  credit  or  other  irrevocable  credit  facility
delivered  to the  Trustee  on or prior to 8:00  a.m.  (California  time) on the
Letter  of  Credit  Substitution  Date,  issued  by a  commercial  bank or other
financial institution,  the terms of which shall in all material respects be the
same as the  Letter of  Credit.  On or prior to the date of the  delivery  of an
Alternate  Letter of Credit  to the  Trustee,  the  Borrower  shall  cause to be
furnished  to the  Authority  and the  Trustee  (i) an opinion  of Bond  Counsel
stating that the delivery of such  Alternate  Letter of Credit to the Trustee is
authorized  pursuant to this Agreement,  complies with the terms hereof and will
not cause the  interest on the Bonds not to be  Tax-exempt,  (ii) such  opinions
regarding the validity of the Alternate  Letter of Credit as the Authority,  the
Trustee and any rating agency then rating the Bonds may reasonably require,  and
(iii) written evidence from Moody's, if the Bonds are then rated by Moody's, and
S&P, if the Bonds are then rated by S&P,  to the effect that such rating  agency
has reviewed the proposed  Alternate  Letter of Credit and that the substitution
of the  proposed  Alternate  Letter of Credit will not,  by itself,  result in a
reduction of its long-term rating of the Bonds below "A".

     It is understood  and agreed that with proper  notification  to the Trustee
and the  Borrower,  the Bank can declare that a default has  occurred  under the
Reimbursement  Agreement  with  the  Borrower  and  such  default  will  cause a
mandatory redemption of Bonds pursuant to Section 4.01(7) of the Indenture.

     Section  5.9.  Covenants  of the  Authority  and  the  Borrower.  It is the
intention of the parties  hereto that  interest on the Bonds shall be and remain
Tax-exempt  so  long  as  the  Bonds  are  Outstanding,  and  to  that  end  the
representations,  covenants, and agreements of the Authority and the Borrower in
this  Section and in  Sections  5.10 and 5.11 are for the benefit of the Trustee
and each and every Holder of the Bonds.  The  Authority  and the  Borrower  each
(unless otherwise indicated below) represents, warrants and agrees as follows:

     (a) The  Project  consists,  and at all  times  shall  consist,  of land or
property which is subject to the allowance for depreciation  provided in Section
167 of the Code,  and  substantially  all (95% or more) of the  proceeds  of the
Bonds including proceeds of investment  thereof,  shall be used to pay the Costs
of the Project which are chargeable to the capital account of the Borrower,  and
which were paid not earlier than 60 days before April 30, 1997.


                                       14

<PAGE>




     (b) No portion of the  proceeds of the Bonds shall be used to provide for a
private or commercial golf course,  country club,  massage parlor,  tennis club,
skating  facility  (including  roller  skating,  skate  board and ice  skating),
racquet sports facility  (including any handball or racquetball  court), hot tub
facility,  suntan facility,  race track,  automobile sales or service  facility,
retail food or beverage facility,  entertainment  facility,  airplane,  gambling
establishment, health club, liquor store, skybox or luxury box.

     (c)  Less  than  25% of the net  proceeds  of the  Bonds  (after  Costs  of
Issuance)  shall be used to purchase  land or  interests  in land.  The Borrower
covenants to spend sufficient sums from the Project Fund on Costs of the Project
to assure compliance with this covenant.

     (d) No proceeds of the Bonds shall be used to acquire any personal property
or  facilities  unless the first use of such  property  or  facilities  shall be
pursuant to such acquisition, except that if the Project consists of acquisition
of a building,  the Borrower shall,  within two years after the Date of Delivery
or the date of  acquisition of such  building,  whichever is earlier,  expend an
amount,  from  proceeds of the Bonds or  otherwise,  equal to 15% of the cost of
acquiring  such building  financed with proceeds of the Bonds on  rehabilitation
costs of such building as required by Section 147(d) of the Code.

     (e) During the three-year  period  following the date the Project is placed
in  service,  the  Borrower  shall  not  allow  any  other  Person  to  become a
"test-period  beneficiary"  of the  Bonds  who is a  beneficiary  of  industrial
development  bonds in an amount  which would cause the  issuance of the Bonds to
exceed such Person's  aggregate  per-taxpayer  limit under Section 144(a)(10) of
the Code.

     (f) The Borrower  shall not enter into any agreement  which would result in
the payment of principal or interest on the Bonds being  "federally  guaranteed"
within the meaning of Section 149(b) of the Code.

     (g) There is no outstanding issue of industrial development bonds which was
used to  finance  any  facilities  which,  in  relation  to the  Project,  would
constitute  (i) a single  building,  (ii) an enclosed  shopping mall, or (iii) a
strip of offices, stores or warehouses using substantial common facilities.

     (h) Subject to the  provisions  of the final  paragraph of Section 5.10, no
actions shall be taken, or omitted to be taken, by the Borrower which would have
the effect,  directly or indirectly,  of causing interest on any of the Bonds to
not be Tax-exempt.

     (i) No changes shall be made in the Project or the use of the Project which
shall in any way impair the Tax-exempt status of interest on the Bonds.

     (j) The  Borrower  shall not make any use of the  proceeds of the Bonds and
shall not direct or knowingly permit the Trustee to invest any proceeds from the
issuance of the Bonds or any acquired obligation in any manner which would cause
the Bonds to


                                                        15

<PAGE>



become  "arbitrage  bonds" within the meaning of Section 148 of the Code and any
Regulations  thereunder,  and the Borrower shall comply with the requirements of
said Section of the Code and said  Regulations,  as the same may be amended from
time to time, so long as any Bonds remain Outstanding.

     (k) The  Borrower  shall  use due  diligence  to cause  the  Project  to be
operated in  accordance  with all  applicable  laws,  rulings,  regulations  and
ordinances.

     (l) The Borrower shall comply with all conditions  imposed by the Authority
and any State or local agency in its approval of the Project.

     (m) The  Borrower  shall  fully and  faithfully  perform all the duties and
obligations  which the Authority has  covenanted  and agreed in the Indenture to
cause  Borrower  to perform  and any duties and  obligations  which  Borrower is
required in the Indenture to perform.  The foregoing shall not apply to any duty
or  undertaking  of the  Authority  which by its nature  cannot be  delegated or
assigned.

     (n) The Borrower acknowledges,  approves and accepts the rights, duties and
obligations imposed on the Borrower pursuant to the Remarketing Agreement.

     (o)  The  Borrower  shall  faithfully  perform  at all  times  any  and all
covenants, undertakings, stipulations and provisions to be observed or performed
by the Borrower contained in the Indenture, in the Bonds, and in all proceedings
of the Authority pertaining thereto, or otherwise required of the Borrower to be
observed or performed, whether express or implied.

     (p) The Borrower  shall comply with the  covenants and  obligations  of the
Borrower contained in the Reimbursement Agreement.

     (q) The Borrower covenants that it shall use less than twenty-five  percent
(25%) of the net  proceeds of the Bonds (after  deducting  Costs of Issuance) to
provide facilities which are directly related and ancillary to the manufacturing
facility  being  financed  with the proceeds of the Bonds,  in  accordance  with
Section 144(a)(12)(C) of the Code.

     (r) The Borrower and the Authority  shall not become a Holder of the Bonds,
and none of the Borrower,  any Related Party or the Authority  shall directly or
indirectly purchase Bonds from the Remarketing Agent.

     Notwithstanding  any other  provision of this  Agreement or the  Indenture,
including in  particular  Article X of the  Indenture,  the  obligations  of the
Borrower  and the  Authority  to  comply  with the  covenants  set forth in this
Section and Section 5.10 shall survive the  defeasance or payment in full of the
Bonds.

     Section  5.10.  Capital  Expenditures.  For the purpose of this Section and
Section 5.09 the following terms shall have the following meanings:



                                       16

<PAGE>



     "Facilities" shall mean those facilities  described in Section 144(a)(1) of
the Code and Regulations thereunder, including Section 1.103-10(b)(2)(ii)(e) and
Section  1.103-10(d)(2)  of the Regulations,  and shall include those facilities
any Principal User of which is the Borrower or a related  person,  as defined in
Section  144(a)(3)  of the  Code,  located  in the  Project  Location,  and  any
contiguous  or  integrated  facility  treated as being  located  in the  Project
Location by reason of the fact that such  facility is located on both sides of a
border   between  the  Project   Location  and  one  or  more  other   political
jurisdictions.

     "Principal  User"  means any  principal  user of the  Project as defined in
Proposed Treasury Regulations Section 1.103-10(h).

     "Project  Location"  shall  mean the area  within  the City of Long  Beach,
California.

     "Regulations"  shall  mean  those  regulations,  whether  now or  hereafter
adopted,  prepared by the United States  Department of the Treasury with respect
to Section 103 or Part IV of subchapter B of chapter 1 of the Code.

     "Section 144 Capital  Expenditures" shall mean those expenditures  required
to be taken into account with respect to the Bonds pursuant to Section 144(a)(1)
and  (4)  of  the   Code   and   Regulations   thereunder,   including   Section
1.103-10(b)(2)(ii) and (iii) of the Regulations,  including any expenditure with
respect to Facilities,  no matter by whom made (regardless of how paid,  whether
in cash,  notes  or  stock in a  taxable  or  nontaxable  transaction),  paid or
incurred  during  the  six-year  period  beginning  3 years  before  the date of
issuance and delivery of the Bonds,  which may, under any rule or election under
the Code, be treated as a capital  expenditure  (whether or not such expenditure
is so  treated),  and  which  is not  paid  or  reimbursed  out of the  original
principal  proceeds  (exclusive  of  investment  income) of the  Bonds,  but not
including excluded expenditures pursuant to Section 144(a)(4)(C) of the Code and
Regulations  thereunder,  including  Section  1.103-10(b)(2)(iv)  and (v) of the
Regulations.  Such term  shall  also  include  research  and  development  costs
properly  allocable  to the  Project no matter  where paid or  incurred,  unless
specifically excluded by Section 144(a)(4)(C).

     The Borrower represents and warrants that substantially all of the proceeds
of the Bonds are to be used with  respect  to the  Project  to be located in the
Project  Location;  that  there  are no  other  outstanding  obligations  issued
subsequent to September  30, 1968, of any state,  territory or possession of the
United States of America,  or any political  subdivision  of the foregoing or of
the  District  of  Columbia,  the  proceeds of which have been or are to be used
primarily with respect to Facilities;  and that the sum of the principal  amount
of the Bonds  plus the  amount  of  Section  144  Capital  Expenditures  for the
three-year  period ending on the date of issuance and delivery of the Bonds does
not exceed $10,000,000.

     The Authority covenants and agrees that it has not taken and shall not take
any action which will cause interest on the Bonds to not be Tax-exempt.



                                       17

<PAGE>



     The Authority hereby elects to have the provisions of Section  144(a)(4)(A)
of the Code apply to the Bonds. The Borrower  covenants that it shall furnish to
the  Authority  prior  to  the  issuance  and  delivery  of the  Bonds  whatever
information is necessary for the Authority to make such election.

     The  Borrower  further  covenants  that it shall take,  and shall cause any
other  Principal  User to  take,  such  further  actions  as are  required  of a
Principal User of property financed by an issue of obligations which are subject
to the $10,000,000 limitation of Section 144(a)(4)(A) of the Code, which actions
are set  forth in  Section  144(a)(4)(A)  of the  Code  and in the  Regulations,
including Section 1.103-10(b) of the Regulations.

     The Borrower further  covenants and agrees, so long as any of the Bonds are
Outstanding  under the  Indenture,  that the aggregate  principal of Bonds being
issued plus the aggregate amount of Section 144 Capital  Expenditures made or to
be made with respect to Facilities  during the six-year  period  beginning three
years  before the date of  issuance  and  delivery of the Bonds shall not exceed
$10,000,000 (or any such larger amount as may be hereafter permitted by law).

     Notwithstanding  anything  in Section  5.9(h) or this  Section  5.10 to the
contrary,  neither  the  Borrower  nor the  Authority  shall have  violated  the
covenants  contained  in Section  5.9(h) or this Section 5.10 if the interest on
any of the Bonds  becomes  taxable to a Person  solely  because such Person is a
"substantial  user" of the Project or a "related  person"  within the meaning of
Section  147(a) of the Code;  and none of the  covenants and  agreements  herein
contained  shall  require  either  the  Borrower  or the  Authority  to enter an
appearance  or  intervene  in  any   administrative,   legislative  or  judicial
proceeding  in  connection  with  any  changes  in  applicable  laws,  rules  or
regulations or in connection  with any decisions of any court or  administrative
agency or other  governmental  body  affecting  the  taxation of interest on the
Bonds.

     Section 5.11.  Special Arbitrage  Certifications.  (a) The Authority hereby
certifies to the  Borrower  (i) that it has not been  notified of any listing or
proposed  listing of it by the Internal  Revenue  Service as a bond issuer whose
arbitrage  certifications  may not be relied upon and (ii) that  issuance of the
Bonds will not violate any provisions of Section 103 of the Code or, Section 148
of the Code, or the  Regulations  issued under such  Sections of the Code,  such
that the interest on the Bonds is not Tax-exempt.

     (b) The Borrower and the Authority  agree to comply with the Tax Regulatory
Agreement,  as such Tax Regulatory  Agreement shall be amended from time to time
in order that interest on the Bonds  remains  Tax-exempt.  The Borrower  further
agrees to cause any other  Principal User (as defined in Section 5.10 hereof) of
the  Project  to  comply  with the  terms  of this  Loan  Agreement  and the Tax
Regulatory  Agreement  to the extent  necessary  to insure that  interest on the
Bonds remains Tax-exempt.




                                       18

<PAGE>



     Section  5.12.  Covenant  to Enter into  Agreement  or  Contract to Provide
Ongoing Disclosure. The Borrower and the Authority hereby agree that the initial
offering  and sale of the Bonds is exempt  from the  requirements  of  Paragraph
(b)(5)(i) of the  Securities  and  Exchange  Commission  Rule 15c2-12  under the
Securities  Exchange Act of 1934, as amended (17 CFR Part 240, ss.  240.15c2-12)
(the "Rule").  The Borrower  hereby  covenants and agrees that if as a result of
the conversion of the interest rate borne by the Bonds from the Weekly  Interest
Rate to the Fixed Interest Rate or as a result of any amendment or supplement to
the  Indenture or this  Agreement,  the Bonds cease to be exempt under the Rule,
the  Borrower  will  enter  into  an  agreement  or  contract,  constituting  an
undertaking,  to provide  ongoing  disclosure as may be necessary to comply with
the Rule as then in effect. The covenant and agreement contained in this Section
5.12 is for the benefit of the Bondholders,  any  Participating  Underwriter and
the Beneficial  Owners (as defined in the Indenture) as required by the Rule. It
is the Borrower's  express intention that this Section 5.12 be assigned pursuant
to and in  accordance  with Section 6.09 of the Indenture to the Trustee for the
benefit of the  Bondholders,  any  Participating  Underwriter and the Beneficial
Owners and that each Bondholder,  Participating Underwriter and Beneficial Owner
be a  beneficiary  of this  Section  5.12 with the right to enforce this Section
5.12  against  the  Borrower.   Notwithstanding  any  other  provision  of  this
Agreement, failure of the Borrower to comply with the provisions of this Section
5.12 shall not be  considered  a Loan  Default  Event;  provided,  however,  the
Trustee may (and, at the request of any Participating Underwriter or the Holders
of at least 25% aggregate  principal amount in Outstanding Bonds,  shall) or any
Beneficial  Owner may take such  actions as may be  necessary  and  appropriate,
including seeking specific  performance by court order, to cause the Borrower to
comply with its obligations under this Section 5.12.


                                   ARTICLE VI

                      DAMAGE, DESTRUCTION AND CONDEMNATION;
                                 USE OF PROCEEDS

     Section 6.1.  Obligation to Continue Payments.  If prior to full payment of
the Bonds (or provision for payment thereof in accordance with the provisions of
the Indenture) (i) the Project or any portion  thereof is destroyed (in whole or
in part) or is  damaged  by fire or other  casualty,  or (ii)  title  to, or the
temporary  use of, the Project or any portion  thereof  shall be taken under the
exercise  of the  power of  eminent  domain by any  governmental  body or by any
Person acting under governmental  authority,  the Borrower shall nevertheless be
obligated to continue to pay the amounts  specified in Article IV hereof, to the
extent not prepaid in accordance with Article VIII hereof.

     Section 6.2. Application of Net Proceeds. The Borrower shall be entitled to
the Net Proceeds, if any, of any insurance or condemnation awards resulting from
the damage,  destruction or  condemnation  of the Project or any portion thereof
for application as provided in this Section. All Net Proceeds shall be deposited
by the  Borrower in an escrow  account  with the Trustee and shall be applied in
one or more of the  following  ways at the  election of the  Borrower,  with the
consent of the Bank, by written notice to the Authority and the Trustee.



                                       19

<PAGE>



     (a) The prompt repair, restoration, relocation, modification or improvement
of the damaged,  destroyed  or  condemned  portion of the Project to enable such
portion of the Project to  accomplish at least the same function as such portion
of the Project was designed to accomplish prior to such damage or destruction or
exercise of such power of eminent  domain.  If the Borrower elects to proceed as
provided in this  subsection  (a), it shall give the  Authority  and the Trustee
written notice thereof,  and evidence of the Bank's  consent,  within 90 days of
the  deposit  of the Net  Proceeds  with the  Trustee.  Any  balance  of the Net
Proceeds  remaining after such work has been completed shall be deposited in the
Revenue Fund to be applied, with the written consent of the Bank, to the payment
of principal of and premium, if any, and interest on the Bonds, or, if the Bonds
have  been  fully  paid (or  provision  for  payment  thereof  has been  made in
accordance with the provisions of the Indenture),  any balance  remaining in the
Revenue Fund shall be paid in accordance with the  requirements of Section 10.04
of the Indenture.

     (b) The  prepayment  of all or a  portion  of the Loan in  accordance  with
Article VIII hereof and  redemption of Bonds.  If the Borrower fails to give the
notice and  evidence  of the Bank's  consent  required by Section  6.2(a)  above
within 90 days of the deposit of the Net Proceeds with the Trustee, the Borrower
shall be deemed to have elected to apply the Net Proceeds to the  prepayment  of
all or a portion of the Loan as provided in this  subsection  (b) in  accordance
with Section 8.2(a)  hereof,  the Bank shall be deemed to have consented to such
application,  and the Authority and the Trustee shall be deemed to have received
written notice thereof for purposes of this Section 6.2.

     Section 6.3.  Insufficiency  of Net  Proceeds.  If the Project or a portion
thereof is to be repaired, restored, relocated, modified or improved pursuant to
Section 6.2(a) hereof,  and if the Net Proceeds are  insufficient to pay in full
the cost of such repair, restoration,  relocation,  modification or improvement,
the  Borrower  will  nonetheless  complete  the  work or  cause  the  work to be
completed  and will pay or cause to be paid any cost  thereof  in  excess of the
amount of the Net Proceeds held in escrow.

     Section 6.4.  Damage to or  Condemnation  of Other  Property.  The Borrower
shall be entitled to the Net Proceeds of any insurance or condemnation  award or
portion  thereof  made for damages to or takings of its property not included in
the Project.


                                   ARTICLE VII

                        LOAN DEFAULT EVENTS AND REMEDIES

     Section 7.1. Loan Default Events. Any one of the following which occurs and
continues shall constitute a Loan Default Event:

     (a) failure of the Borrower to pay any Loan  Repayment when and as the same
shall become due and payable pursuant to Section 4.2(a);



                                       20

<PAGE>



     (b) failure of the  Borrower to pay any amounts  payable  hereunder,  other
than Loan  Repayments,  when and as the same shall  become  due,  which  failure
continues for a period of 30 days after written notice delivered to the Borrower
and the Bank,  which  notice  shall  specify such failure and request that it be
remedied,  given by the  Authority or the Trustee,  unless the Authority and the
Trustee shall agree in writing to an extension of such time;

     (c) failure of the Borrower to observe and perform any covenant,  condition
or agreement on its part required to be observed or performed by this Agreement,
other than a covenant described in subsection (a) or subsection (b) above, which
failure  continues for a period of 30 days after written notice delivered to the
Borrower and the Bank,  which notice shall specify such failure and request that
it be remedied,  given by the Authority or the Trustee, unless the Authority and
the Trustee, with the written approval of the Bank, shall agree in writing to an
extension of such time;  provided,  however,  that if the failure  stated in the
notice  cannot be corrected  within such period,  the  Authority and the Trustee
will not  unreasonably  withhold  their  consent to an extension of such time if
corrective action is instituted within such period and diligently  pursued until
the default is corrected; or

     (d)  existence  of an Event of Default  under and as  defined  in  Sections
7.01(A)-(D) of the Indenture.

     The  provisions  of  subsection  (c) of this  Section  are  subject  to the
limitation  that the  Borrower  shall not be deemed in default if and so long as
the  Borrower  is  unable  to carry out its  agreements  hereunder  by reason of
strikes,  lockouts or other  industrial  disturbances;  acts of public  enemies;
orders of any kind of the government of the United States or of the State or any
of  their  departments,  agencies,  or  officials,  or  any  civil  or  military
authority;  insurrections,  riots, epidemics, landslides; lightning; earthquake;
fire; hurricanes;  storms; floods;  washouts;  droughts;  arrests;  restraint of
government and people; civil disturbances;  explosions;  breakage or accident to
machinery, transmission pipes or canals; partial or entire failure of utilities;
or any other cause or event (whether similar or dissimilar to the foregoing) not
reasonably  within  the  control  of the  Borrower;  it  being  agreed  that the
settlement  of strikes,  lockouts  and other  industrial  disturbances  shall be
entirely  within the  discretion of the Borrower,  and the Borrower shall not be
required  to  make  settlement  of  strikes,   lockouts  and  other   industrial
disturbances  by acceding to the demands of the  opposing  party or parties when
such course is, in the judgment of the  Borrower,  unfavorable  to the Borrower.
This limitation  shall not apply to any default under  subsections  (a), (b), or
(d) of this Section.  Notwithstanding  any other  provision of this Agreement to
the contrary,  so long as the Bank is not in default under the Letter of Credit,
the Trustee shall not without the prior written consent or direction of the Bank
exercise any remedies under this Agreement in the case of any Loan Default Event
described in subsections (a), (b), or (c) above.

     Section 7.2.  Remedies on Default.  Subject to the last sentence of Section
7.1 above,  whenever  any Loan  Default  Event shall have  occurred and shall be
continuing,



                                       21

<PAGE>



     (a) The Trustee,  by written  notice to the  Borrower  and the Bank,  shall
declare all unpaid amounts  payable under Section 4.2(a) of this Agreement to be
due and payable  immediately,  provided that  concurrently with or prior to such
notice the unpaid  principal  amount of the Bonds shall have been declared to be
due and payable under the Indenture. Upon any such declaration such amount shall
become  and shall be  immediately  due and  payable  in the  amount set forth in
Section 7.01 of the Indenture.

     (b) The  Trustee  shall have  access to and may  inspect,  examine and make
copies of the books  and  records  and any and all  accounts,  data and  federal
income tax and other tax returns of the Borrower.

     (c) The  Authority  or the  Trustee may take  whatever  action at law or in
equity as may be  necessary  or  desirable  to collect  the  payments  and other
amounts  then due and  thereafter  to become due or to enforce  performance  and
observance of any  obligation,  agreement or covenant of the Borrower under this
Agreement.

     In case the Trustee or the  Authority  shall have  proceeded to enforce its
rights under this Agreement and such proceedings shall have been discontinued or
abandoned for any reason or shall have been determined  adversely to the Trustee
or the Authority,  then,  and in every such case, the Borrower,  the Trustee and
the Authority  shall be restored  respectively  to their  several  positions and
rights  hereunder,  and all rights,  remedies  and powers of the  Borrower,  the
Trustee  and the  Authority  shall  continue  as though no such  action had been
taken.

     The Borrower  covenants  that, in case a Loan Default Event shall occur and
all unpaid amounts  payable under Section 4.2(a) hereof shall have been declared
due and payable immediately pursuant to Section 7.2(a) hereof, then, upon demand
of the Trustee,  the Borrower will pay to the Trustee the whole amount that then
shall have  become due and  payable  under said  Section,  with  interest on the
amount then overdue at the rate of ten percent (10%) per annum until such amount
has been paid or, if ten percent is greater than the rate then permitted by law,
at the greatest rate then permitted.

     In case the  Borrower  shall fail  forthwith  to pay such amounts upon such
demand,  the Trustee  shall be entitled and empowered to institute any action or
proceeding at law or in equity for the collection of the sums so due and unpaid,
and may prosecute any such action or proceeding to judgment or final decree, and
may enforce any such  judgment or final decree  against the Borrower and collect
in the manner provided by law the moneys adjudged or decreed to be payable.

     In  case  proceedings  shall  be  pending  for  the  bankruptcy  or for the
reorganization  of the Borrower under the federal  bankruptcy  laws or any other
applicable  law, or in case a receiver or trustee shall have been  appointed for
the  property  of the  Borrower  or in the case of any  other  similar  judicial
proceedings  relative  to the  Borrower,  or the  creditors  or  property of the
Borrower,  then the Trustee shall be entitled and empowered,  by intervention in
such proceedings or otherwise, to file and prove a claim or claims for the whole
amount owing and unpaid  pursuant to this Agreement and, in case of any judicial
proceedings,  to file such proofs of claim and other  papers or documents as may
be necessary or advisable in order to have the


                                       22

<PAGE>



claims of the  Trustee  allowed in such  judicial  proceedings  relative  to the
Borrower,  its creditors or its property,  and to collect and receive any moneys
or other property  payable or deliverable on any such claims,  and to distribute
such amounts as provided in the Indenture  after the deduction of its reasonable
charges  and  expenses.  Any  receiver,  assignee  or trustee in  bankruptcy  or
reorganization is hereby authorized to make such payments to the Trustee, and to
pay to the Trustee any amount due it for reasonable  compensation  and expenses,
including  reasonable expenses and fees of counsel incurred by it up to the date
of such distribution.

     Section 7.3.  Agreement to pay Attorneys'  Fees and Expenses.  In the event
the Borrower  should  default  under any of the  provisions  of this  Agreement,
whether or not such default constitutes a Loan Default Event hereunder,  and the
Authority or the Trustee should employ attorneys or incur other expenses for the
collection  of the  payments  due under this  Agreement  or the  enforcement  of
performance  or  observance  of any  obligation  or agreement on the part of the
Borrower  herein  contained,  the Borrower agrees to pay to the Authority or the
Trustee  the  reasonable  fees and  expenses  of such  attorneys  and such other
reasonable expenses so incurred by the Authority or the Trustee.

     Section  7.4.  No Remedy  Exclusive.  No remedy  herein  conferred  upon or
reserved to the  Authority  or the Trustee is  intended to be  exclusive  of any
other  available  remedy or  remedies,  but each and every such remedy  shall be
cumulative  and shall be in  addition  to every  other  remedy  given under this
Agreement  or now or  hereafter  existing at law or in equity or by statute.  No
delay or omission to exercise any right or power accruing upon any default shall
impair any such right or power or shall be construed to be a waiver thereof, but
any such right and power may be exercised  from time to time and as often as may
be deemed  expedient.  To entitle the  Authority  or the Trustee to exercise any
remedy  reserved to it in this  Article,  it shall not be  necessary to give any
notice, other than such notice as may be herein expressly required.  Such rights
and  remedies  as are given the  Authority  hereunder  shall also  extend to the
Trustee,  and the Trustee  and the  Holders of the Bonds  shall be deemed  third
party beneficiaries of all covenants and agreements herein contained.

     Section 7.5. Waivers.  No delay or omission of the Authority or the Trustee
to exercise any right or power arising upon the  occurrence of any default shall
impair any such right or power or shall be  construed to be a waiver of any such
default or an  acquiescence  therein;  and every power and remedy  given by this
Agreement to the Authority or the Trustee may be exercised from time to time and
as often as may be deemed  expedient.  In the event any  agreement  or  covenant
contained in this  Agreement  should be breached by the Borrower and  thereafter
waived by the  Authority  or the  Trustee,  such waiver  shall be limited to the
particular  breach so waived  and shall not be deemed to waive any other  breach
hereunder.


                                  ARTICLE VIII

                                   PREPAYMENT

     Section 8.1.  Redemption of Bonds with Prepayment  Moneys. By virtue of the
assignment of the rights of the Authority under this Agreement to the Trustee as
is provided in


                                       23

<PAGE>



Section 4.5,  the  Borrower  agrees to and shall pay directly to the Trustee any
amount  permitted  or required  to be paid by it under this  Article  VIII.  The
Indenture  provides  that the Trustee  shall use the moneys so paid to it by the
Borrower,  pursuant to the written  instructions of the Borrower,  to redeem the
Bonds on the date set for such redemption pursuant to Section 8.5.

     Section 8.2.  Options to Prepay Loan. The Borrower shall have the option to
prepay the Loan by paying to the  Trustee  the amount set forth in Section  8.4,
for deposit in the Revenue Fund, to be applied to the redemption of Bonds as set
forth below on the earliest date such Bonds are subject to  redemption  pursuant
to the Indenture and as to which notice of redemption can be given in accordance
with the  Indenture,  at the  redemption  prices  set  forth  below,  under  the
following circumstances:

     (a) The  Borrower  may prepay such  amounts in whole,  and cause all of the
Outstanding  Bonds to be redeemed at the  redemption  price set forth in Section
4.01(5) of the Indenture, if any of the following shall have occurred:

          (i) The Project shall have been damaged or  destroyed,  in whole or in
part,  by fire or other  casualty and the  Authority  and the Trustee  receive a
Certificate of the Authorized Representative of the Borrower to the effect that:
(1) it is not practicable or desirable to rebuild, repair or restore the Project
within a period of six consecutive  months following such damage or destruction,
(2) the  Borrower is or will be thereby  prevented  from  carrying on its normal
operations at the Project for a period of at least six  consecutive  months,  or
(3) the cost of  restoration of the Project would  substantially  exceed the Net
Proceeds of insurance carried thereon; or

          (ii) Title to, or the  temporary use of, all or  substantially  all of
the Project shall have been taken by any governmental  authority,  or any Person
acting under governmental authority,  exercising the power of eminent domain and
the  Authority  and  the  Trustee   receive  a  Certificate  of  the  Authorized
Representative  of the Borrower to the effect that:  (1) the Borrower is thereby
prevented from carrying on its normal  operations at the Project for a period of
at least six consecutive  months or (2) the Project is unsuitable for use by the
Borrower;

     (b) The Borrower may prepay all or any part of the Loan from any  available
funds and cause all or any part of the  Outstanding  Bonds to be redeemed at the
redemption  prices set forth in Section 4.01(2) or 4.01(6) of the Indenture,  as
applicable,  but subject to any  additional  requirements  of the  Reimbursement
Agreement.

     Section 8.3. Mandatory  Prepayment.  (a) The Borrower shall have and hereby
accepts the  obligation  to prepay in full the Loan by paying to the Trustee the
amount set forth in Section 8.4 for  deposit to the  Revenue  Fund to be used to
redeem all the Outstanding  Bonds on the earliest date such Bonds are subject to
redemption  pursuant to the Indenture  and as to which notice of the  redemption
can be given in accordance  with the  Indenture,  at the  redemption  prices set
forth in Section  4.01(5) of the Indenture with respect to subsection (i) below,
Section


                                       24

<PAGE>



4.01(3) of the Indenture with respect to subsections  (ii) and (iii) below,  and
in the Indenture Sections noted with respect to subsection (iv) below:

                           (i) if and when as a  result  of any  changes  in the
                  Constitution of the United States of America or the California
                  Constitution  or as a result of any  legislative,  judicial or
                  administrative  action,  this Agreement shall have become void
                  or  unenforceable  or impossible of  performance in accordance
                  with the  intention  and  purposes of the parties  hereto,  or
                  shall have been declared unlawful.

                           (ii) if,  due to the  untruth  or  inaccuracy  of any
                  representation  or warranty made by the Borrower  herein or in
                  connection with the offer and sale of the Bonds, or the breach
                  of any covenant or warranty of the Borrower  contained in this
                  Agreement,   interest  on  the  Bonds,  or  any  of  them,  is
                  determined not to be Tax-exempt to the Holders  thereof (other
                  than a Holder who is a "substantial  user" of the Project or a
                  "related  person"  within the meaning of Section 147(a) of the
                  Code) by a final administrative  determination of the Internal
                  Revenue  Service  or  final  judicial  decision  of a court of
                  competent  jurisdiction  in a proceeding of which the Borrower
                  received notice and was afforded an opportunity to participate
                  in to the full extent  permitted  by law. A  determination  or
                  decision  will be  considered  final for this purpose when all
                  periods for administrative and judicial review have expired.

                           (iii)  if  either:  (a)  the  Borrower  or any  other
                  Principal  User  of  the  Project  files  a  notice  with  the
                  Authority  and the  Trustee  to the  effect  that the  capital
                  expenditure  limitation  of Section  144(a)(4) of the Code has
                  been  exceeded,  or will be  exceeded,  within a period  of 60
                  days;  or (b) there is a final  determination  (as  defined in
                  subsection  (ii) above) by the Internal  Revenue  Service or a
                  court of competent jurisdiction that such capital expenditures
                  limitation has been exceeded.

                            (iv) if mandatory  redemption  is required by any of
                  Sections 4.01(4), (7), or (8) of the Indenture.

The amount payable by the Borrower in the event of a prepayment required by this
Section  shall be  determined  as set forth in  Section  8.4 hereof and shall be
deposited in the Revenue Fund upon demand by the Authority or the Trustee.

     (b) The Borrower shall prepay all or any part of the Loan from Net Proceeds
under the circumstances described in Section 6.2(b) hereof, and cause all or any
part of the Outstanding  Bonds to be redeemed at the redemption  price set forth
in Section 4.01(5) of the Indenture.

     Section 8.4.  Amount of Prepayment.  In the case of a prepayment in full of
the Loan by the Borrower  under this  Agreement  pursuant to Section 8.2 or 8.3,
the  amount to be paid shall be a sum  sufficient,  together  with  other  funds
deposited  with the  Trustee  and  available  for such  purpose,  to pay (1) the
redemption price specified in the applicable  subsections of Section 8.2 or 8.3,
for all Outstanding Bonds, plus all interest accrued and to accrue to the


                                       25

<PAGE>



redemption  date,  (2) all  reasonable  and  necessary  fees and expenses of the
Authority, the Trustee and any paying agent allowable pursuant to this Agreement
and the Indenture  accrued and to accrue  through final payment of the Bonds and
(3) all other  liabilities  of the  Borrower  accrued  and to accrue  under this
Agreement.

     In the case of partial  prepayment  of the Loan by the Borrower  under this
Agreement  pursuant to Section 8.2 or 8.3,  the amount to be paid shall be a sum
sufficient,  together with other funds  deposited with the Trustee and available
for such  purpose,  to pay the  redemption  price  specified  in the  applicable
subsections  of  Section  8.2 or 8.3,  for the  Bonds to be  redeemed,  plus all
interest  accrued and to accrue to the  redemption  date, and to pay expenses of
redemption  of such  Bonds.  All  partial  prepayments  of the Loan  made by the
Borrower under this Agreement shall be applied in inverse order of the due dates
thereof, or as otherwise provided in the Indenture.

     Section 8.5.  Notice of Prepayment.  The Borrower shall give written notice
to the Authority,  the Bank and the Trustee (1) while the Bonds bear interest at
the Weekly  Interest  Rate,  not less than twenty (20) days prior to the date of
any  prepayment of a Loan Repayment and (2) while the Bonds bear interest at the
Fixed  Interest  Rate,  not less than  forty  (40) days prior to the date of any
prepayment of a Loan Repayment,  in each case specifying the date upon which any
prepayment  will be made,  the basis for such  prepayment and the amount of such
repayment.  If the Borrower  fails to give such notice of a  prepayment  of Loan
Repayments,  the Indenture  provides that the Trustee shall hold such prepayment
in the Redemption Fund.


                                   ARTICLE IX

              NON-LIABILITY OF AUTHORITY; EXPENSES; INDEMNIFICATION

     Section  9.1.  Non-Liability  of  Authority.  The  Authority  shall  not be
obligated to pay the principal of, or premium, if any, or interest on the Bonds,
except from Revenues. The Borrower hereby acknowledges that the Authority's sole
source of moneys to repay the Bonds will be provided by the payments made by the
Borrower  pursuant to this Agreement,  together with other  Revenues,  including
investment  income on certain  funds and accounts  held by the Trustee under the
Indenture,  and hereby  agrees that if the payments to be made  hereunder  shall
ever prove  insufficient  to pay all  principal  of, and  premium,  if any,  and
interest  on the  Bonds as the same  shall  become  due  (whether  by  maturity,
redemption,  acceleration or otherwise),  then upon notice from the Trustee, the
Borrower shall pay such amounts as are required from time to time to prevent any
deficiency  or default in the payment of such  principal,  premium or  interest,
including,  but not  limited  to,  any  deficiency  caused  by acts,  omissions,
nonfeasance  or  malfeasance  on the  part of the  Trustee,  the  Borrower,  the
Authority or any third party.

     Section 9.2.  Expenses.  The Borrower  covenants  and agrees to pay, and to
indemnify  the  Authority  and the  Trustee  against,  all  costs  and  charges,
including   reasonable  fees  and   disbursements  of  attorneys,   accountants,
consultants  and other experts,  incurred in good faith in connection  with this
Agreement, the Bonds or the Indenture.


                                       26

<PAGE>




     Section 9.3.  Indemnification.  The Borrower  releases the  Authority,  the
State, the Treasurer of the State and the Trustee from, and covenants and agrees
that none of the  Authority,  the State or the Trustee  shall be liable for, and
covenants and agrees to indemnify and hold  harmless the  Authority,  the State,
the  Treasurer of the State and the Trustee and their  officers,  employees  and
agents from and against,  any and all losses,  claims,  damages,  liabilities or
expenses, of every conceivable kind, character and nature whatsoever arising out
of,  resulting  from,  or in any way  connected  with  (1) the  Project,  or the
conditions,  occupancy, use, possession,  conduct or management of, or work done
in or  about,  or  from  the  planning,  design,  acquisition,  installation  or
construction of, the Project or any part thereof;  (2) the issuance of any Bonds
or any  certifications or  representations  made in connection  therewith by the
Borrower  and the carrying out of any of the  transactions  contemplated  by the
Bonds,  the  Indenture,  or this  Agreement;  (3) the  Trustee's  acceptance  or
administration of the trusts under the Indenture, or the exercise or performance
of any of its powers or duties under the Indenture;  or (4) any untrue statement
or alleged untrue statement of any material fact or omission or alleged omission
to state a material fact necessary to make the statements  made, in light of the
circumstances  under  which  they were made,  not  misleading,  in the  official
statement utilized by any underwriter in connection with the sale or offering of
any Bonds;  provided that in each case such indemnity  shall not be required for
damages that result from the willful misconduct or negligence on the part of the
party seeking such  indemnity.  The indemnity  required by this Section shall be
only to the extent  that any loss  sustained  by the  Authority  or the  Trustee
exceeds  the Net  Proceeds  the  Authority  or the  Trustee  receives  from  any
insurance  carried  by the  Borrower  with  respect to the loss  sustained.  The
Borrower further covenants and agrees to pay or to reimburse the Authority,  the
State, the Treasurer of the State and the Trustee and their officers,  employees
and agents for any and all costs,  reasonable  attorneys  fees,  liabilities  or
expenses  incurred  in  connection  with  investigating,  defending  against  or
otherwise in  connection  with any such losses,  claims,  damages,  liabilities,
expenses or actions, except to the extent that the same arise out of the willful
misconduct or negligence  of the party  claiming such payment or  reimbursement.
The  provisions of this Section shall survive the payment and  retirement of the
Bonds and the termination of this Agreement.


                                    ARTICLE X

                                  MISCELLANEOUS

     Section 10.1. Notices. All notices,  certificates,  or other communications
given hereunder shall be deemed  sufficiently given on (i) the day such notices,
certificates  or  other  communications  are  received  when  sent  by  personal
delivery,  including tested telex or facsimile communication,  or (ii) the third
day following the day on which the same have been mailed by first class, postage
prepaid, addressed to the Authority, the Borrower, the Trustee, the Tender Agent
or the Bank,  as the case may be, at the address set forth for such party below.
A duplicate  copy of each  notice,  certificate,  or other  communication  given
hereunder  by either the  Authority  or the  Borrower to the other shall also be
given to the Trustee,  the Tender Agent,  Borrower's  counsel and the Bank.  The
Authority,  the  Borrower,  the  Trustee,  the Tender Agent and the Bank may, by
notice given  hereunder,  designate any different  addresses to which subsequent
notices, certificates, or other communications shall be sent.


                                       27

<PAGE>




     If to the Authority:

          California Economic Development Financing Authority
          c/o California Trade and Commerce Agency
          801 K Street, Suite 1700
          Sacramento, California 95814
          Attention: Chair
          (916) 324-1299  Fax:  (916) 322-7214

     If to the Borrower:

          Advanced Aerodynamics and Structures, Inc.
          3501 Lakewood Boulevard
          Long Beach, California 90808
          Attention:  President
          (562) 938-8618   Fax:  (562) 938-8620

     If to the Trustee or Tender Agent:

          First Trust of California, National Association
          One California Street, 4th Floor
          San Francisco, California  94111
          Attention: Municipal Trusts and Agency
          (415) 273-4500  Fax:  (415) 273-4590

     If to the Bank:

          The Sumitomo Bank, Ltd.
          777 South Figueroa Street, Suite 2600
          Los Angeles, California  90017
          Attention: Structured Finance & Financial Institutions Group
          (213) 955-0800  Fax:  (213) 623-6832

     If to the Remarketing Agent

          Rauscher Pierce Refsnes, Inc.
          2711 North Haskell Avenue, Suite 2400
          Dallas, Texas 75204
          Attention:  Fixed Income Banking
          (214) 989-1000  Fax:  (214) 989-1842

     Section 10.2.  Severability.  If any provision of this  Agreement  shall be
held  or  deemed  to  be,  or  shall  in  fact  be,   illegal,   inoperative  or
unenforceable,  the same  shall not  affect any other  provision  or  provisions
herein  contained or render the same invalid,  inoperative,  or unenforceable to
any extent whatever.



                                       28

<PAGE>



     Section 10.3. Execution of Counterparts.  This Agreement may be executed in
several counterparts,  each of which shall be an original and all of which shall
constitute but one and the same instrument; provided, however, that for purposes
of perfecting a security  interest in this Agreement by the Trustee and the Bank
under Article 9 of the California  Uniform Commercial Code, only the counterpart
delivered, pledged, and assigned to the Trustee shall be deemed the original.

     Section 10.4.  Amendments,  Changes and Modifications.  Except as otherwise
provided in this Agreement or the Indenture,  subsequent to the initial issuance
of Bonds and prior to their  payment  in full,  or  provision  for such  payment
having  been  made as  provided  in the  Indenture,  this  Agreement  may not be
effectively  amended,  changed,  modified,  altered or  terminated  without  the
written consent of the Trustee and the Bank.

     Section 10.5.  Governing Law. This Agreement shall be governed  exclusively
by and  construed  in  accordance  with the  applicable  laws of the  State as a
contract  executed and delivered  within the State to be fully performed  within
the State.

     Section 10.6. Authorized Representative of the Borrower. Whenever under the
provisions  of this  Agreement  the  approval of the Borrower is required or the
Authority  or the  Trustee is required to take some action at the request of the
Borrower, such approval or such request shall be given on behalf of the Borrower
by the  Authorized  Representative  of the  Borrower,  and the Authority and the
Trustee  shall be  authorized to act on any such approval or request and neither
party hereto shall have any  complaint  against the other or against the Trustee
as a result of any such action taken.

     Section 10.7. Term of the Agreement.  This Agreement shall be in full force
and effect from the date  hereof and shall  continue in effect as long as any of
the  Bonds  remain  Outstanding  or the  Letter  of Credit  remains  in  effect,
whichever is later. All representations and certifications by the Borrower as to
all matters  affecting  the  Tax-exempt  status of interest on the Bonds and all
indemnifications  by the  Borrower  to the  Authority,  the State or the Trustee
shall survive the termination of this Agreement.

     Section 10.8. Binding Effect.  This Agreement shall inure to the benefit of
and shall be binding  upon the  Authority,  the  Borrower  and their  respective
successors  and  assigns;  subject,  however,  to the  limitations  contained in
Section 5.2 hereof.

     Section 10.9. References to Bank.  Notwithstanding any provisions contained
herein to the  contrary,  the Bank shall be  entitled  to take all  actions  and
exercise  all rights  hereunder  for its own account so long as the Bank has not
wrongfully  dishonored  any drawings  under the Letter of Credit and the Bank is
not in liquidation, bankruptcy or receivership proceedings. After the expiration
or  termination  of the Letter of Credit and after all  obligations  owed to the
Bank  pursuant  to the  Reimbursement  Agreement  have  been  paid  in  full  or
discharged,  all references to the Bank contained  herein shall be null and void
and of no further force and effect.



                                       29

<PAGE>



     Section 10.10. Brokerage  Confirmations.  The Borrower acknowledges that to
the extent  regulations of the  Comptroller of the Currency or other  applicable
regulatory   entity  grant  the   Borrower   the  right  to  receive   brokerage
confirmations  of  security  transactions  under  the  Indenture,  the  Borrower
specifically  waives receipt of such  confirmations  to the extent  permitted by
law. The Trustee is required  under the  Indenture to furnish the Borrower  with
periodic cash  transaction  statements  which include  detail for all securities
transactions made by the Trustee on behalf of the Borrower thereunder.

                           [End of the Loan Agreement]


                                       30

<PAGE>



     IN WITNESS WHEREOF, the California Economic Development Financing Authority
has caused this Agreement to be executed in its name and the Borrower has caused
this  Agreement  to be  executed  in its name,  all as of the date  first  above
written.


                                CALIFORNIA ECONOMIC DEVELOPMENT
                                FINANCING AUTHORITY



                                By:___________________________________________
                                            Chair

ATTEST



By:__________________________________
        Secretary


APPROVED AS TO FORM



By:__________________________________
         Counsel


                                  ADVANCED AERODYNAMICS AND
                                  STRUCTURES, INC.



                                  By:_______________________________________
                                         Authorized Signatory




<PAGE>


                                    EXHIBIT A


                                   THE PROJECT

     The  Project  consists  of the (1)  construction  of a 200,000  square foot
manufacturing  facility  on a parcel of leased  land  located  at 3205  Lakewood
Boulevard,  Long Beach, California (the "Project Site"); and (2) acquisition and
installation of certain manufacturing equipment at the Project Site.


                                       A-1


               CALIFORNIA ECONOMIC DEVELOPMENT FINANCING AUTHORITY



                                       and


           FIRST TRUST OF CALIFORNIA, NATIONAL ASSOCIATION, AS TRUSTEE







                               INDENTURE OF TRUST


                           Dated as of August 1, 1997






                                   $8,500,000
               CALIFORNIA ECONOMIC DEVELOPMENT FINANCING AUTHORITY
                         VARIABLE RATE DEMAND INDUSTRIAL
                     DEVELOPMENT REVENUE BONDS, SERIES 1997
              (ADVANCED AERODYNAMICS AND STRUCTURES, INC. PROJECT)








<PAGE>



                                TABLE OF CONTENTS



                                                                           Page

PARTIES......................................................................1
PREAMBLES....................................................................1

                                    ARTICLE I

                DEFINITIONS; CONTENT OF CERTIFICATES AND OPINIONS

SECTION 1.01.  Definitions...................................................2
SECTION 1.02.  Content of Certificates and Opinions..........................15
SECTION 1.03.  Interpretation................................................15

                                   ARTICLE II

                                    THE BONDS

SECTION 2.01.  Authorization of Bonds........................................16
SECTION 2.02.  Terms of the Bonds............................................16
SECTION 2.03.  Conversion of Bonds...........................................17
SECTION 2.04.  Execution of Bonds............................................19
SECTION 2.05.  Transfer of Bonds.............................................19
SECTION 2.06.  Exchange of Bonds.............................................20
SECTION 2.07.  Bond Register.................................................20
SECTION 2.08.  Temporary Bonds...............................................20
SECTION 2.09.  Bonds Mutilated, Lost, Destroyed or Stolen....................20
SECTION 2.10.  Special Obligations...........................................21
SECTION 2.11.  Book-Entry Only System........................................21

                                   ARTICLE III

                   ISSUANCE OF BONDS; APPLICATION OF PROCEEDS

SECTION 3.01.  Issuance of the Bonds.........................................23
SECTION 3.02.  Application of Proceeds of the Bonds..........................23
SECTION 3.03.  Establishment and Application of Project Fund and Costs of
               Issuance Fund.................................................23
SECTION 3.04.  Validity of Bonds.............................................25

                                   ARTICLE IV

                        REDEMPTION AND PURCHASE OF BONDS

SECTION 4.01.  Terms of Redemption...........................................25
SECTION 4.02.  Selection of Bonds for Redemption.............................26
SECTION 4.03.  Notice of Redemption..........................................27
SECTION 4.04.  Partial Redemption of Bonds...................................27
SECTION 4.05.  Effect of Redemption..........................................27
SECTION 4.06.  Purchase of Bonds by Tender Agent.............................28


                                        i

<PAGE>



SECTION 4.07.  Mandatory Tender of Bonds.....................................28


                                    ARTICLE V

                          REVENUES; FUNDS AND ACCOUNTS;
                        PAYMENT OF PRINCIPAL AND INTEREST

SECTION 5.01.  Pledge and Assignment; Revenue Fund...........................29
SECTION 5.02.  Allocation of Revenues........................................30
SECTION 5.03.  Priority of Moneys in Revenue Fund; Letter of Credit Account..30
SECTION 5.04.  Letter of Credit..............................................32
SECTION 5.05.  Investment of Moneys..........................................32
SECTION 5.06.  Additional Duties of Trustee..................................33
SECTION 5.07.  Establishment of Rebate Fund..................................33

                                   ARTICLE VI

                              PARTICULAR COVENANTS

SECTION 6.01.  Punctual Payment..............................................34
SECTION 6.02.  Extension of Payment of Bonds.................................34
SECTION 6.03.  Against Encumbrances..........................................34
SECTION 6.04.  Power to Issue Bonds and Make Pledge and Assignment...........35
SECTION 6.05.  Accounting Records and Reports................................35
SECTION 6.06.  Arbitrage Covenants...........................................35
SECTION 6.07.  Other Covenants...............................................35
SECTION 6.08.  Further Assurances............................................36
SECTION 6.09.  Covenant to Enter into Agreement or Contract to Provide 
               Ongoing Disclosure............................................36

                                   ARTICLE VII

                  EVENTS OF DEFAULT AND REMEDIES OF BONDHOLDERS

SECTION 7.01.  Events of Default; Acceleration; Waiver of Default............36
SECTION 7.02.  Institution of Legal Proceedings by Trustee...................38
SECTION 7.03.  Application of Revenues and Other Funds After Default.........38
SECTION 7.04.  Trustee to Represent Bondholders..............................39
SECTION 7.05.  Bondholders' Direction of Proceedings.........................39
SECTION 7.06.  Limitation on Bondholders' Right to Sue.......................39
SECTION 7.07.  Absolute Obligation of Authority..............................40
SECTION 7.08.  Termination of Proceedings....................................40
SECTION 7.09.  Remedies Not Exclusive........................................40
SECTION 7.10.  No Waiver of Default..........................................40
SECTION 7.11.  Consent To Defaults...........................................40




                                       ii

<PAGE>



                                  ARTICLE VIII

                          THE TRUSTEE, THE REMARKETING
                           AGENT AND THE TENDER AGENT

SECTION 8.01.  Duties, Immunities and Liabilities of Trustee.................41
SECTION 8.02.  Merger or Consolidation.......................................42
SECTION 8.03.  Liability of Trustee..........................................42
SECTION 8.04.  Right of Trustee to Rely on Documents.........................43
SECTION 8.05.  Preservation and Inspection of Documents......................44
SECTION 8.06.  Compensation and Indemnification..............................44
SECTION 8.07.  Notice to Rating Agency.......................................44
SECTION 8.08.  Qualifications of Remarketing Agent...........................44
SECTION 8.09.  Remarketing of Bonds..........................................45
SECTION 8.10.  Creation of Purchase Fund; Purchase of Bonds Delivered to 
               Tender Agent..................................................46
SECTION 8.11.  Delivery of Bonds.............................................47
SECTION 8.12.  Delivery of Proceeds of Remarketing...........................48
SECTION 8.13.  No Purchases or Sales After Default...........................48
SECTION 8.14.  Qualifications of Tender Agent................................48
SECTION 8.15.  Paying Agent..................................................48
SECTION 8.16.  Several Capacities............................................49

                                   ARTICLE IX

                   MODIFICATION OR AMENDMENT OF THE INDENTURE

SECTION 9.01.  Amendments Permitted..........................................49
SECTION 9.02.  Effect of Supplemental Indenture..............................50
SECTION 9.03.  Endorsement of Bonds; Preparation of New Bonds................50
SECTION 9.04.  Amendment of Particular Bonds.................................50

                                    ARTICLE X

                                   DEFEASANCE

SECTION 10.01.  Discharge of Indenture.......................................51
SECTION 10.02.  Discharge of Liability on Bonds..............................51
SECTION 10.03.  Deposit of Money or Securities with Trustee..................52
SECTION 10.04.  Payments After Discharge of Indenture........................52

                                   ARTICLE XI

                                  MISCELLANEOUS

SECTION 11.01.  Liability of Authority Limited to Revenues...................53
SECTION 11.02.  Successor Is Deemed Included in All References to 
                Predecessor..................................................53
SECTION 11.03.  Limitation of Rights to Parties and Bondholders..............53
SECTION 11.04.  Waiver of Notice.............................................53
SECTION 11.05.  Destruction of Bonds.........................................53
SECTION 11.06.  Severability of Invalid Provisions...........................53


                                       iii

<PAGE>



SECTION 11.07.  Governing Law................................................54
SECTION 11.08.  Notices......................................................54
SECTION 11.09.  Evidence of Rights of Bondholders............................55
SECTION 11.10.  Disqualified Bonds...........................................56
SECTION 11.11.  Money Held for Particular Bonds..............................56
SECTION 11.12.  Funds and Accounts...........................................57
SECTION 11.13.  Waiver of Personal Liability.................................57
SECTION 11.14.  Execution in Several Counterparts............................57
SECTION 11.15.  Actions Due on Saturdays, Sundays and Holidays...............57
SECTION 11.16.  References to Bank...........................................57

EXHIBIT A - Form of Bond



                                       iv

<PAGE>



                               INDENTURE OF TRUST


     THIS INDENTURE OF TRUST, dated as of August 1, 1997, between the CALIFORNIA
ECONOMIC  DEVELOPMENT  FINANCING AUTHORITY (the "Authority"),  a body public and
corporate,  and a  public  instrumentality  of  the  State  of  California  (the
"State"),  duly  organized  and  validly  existing  under the laws of the State,
particularly  Part 10.2 of  Division 3 of Title 2 of the  California  Government
Code (commencing with Section 15710) (the "Act"), and FIRST TRUST OF CALIFORNIA,
NATIONAL  ASSOCIATION,  a national  banking  association  organized and existing
under and by virtue of the laws of the United States of America (the "Trustee"),

                              W I T N E S S E T H:

     WHEREAS,  the  Authority was  established  for the purpose of promoting and
encouraging commerce and industry,  and generally to foster economic development
in the State,  and is empowered  under the  provisions  of the Act  (capitalized
terms used  herein  shall  have the  meanings  given such terms in Section  1.01
hereof) to issue its bonds and to enter into loan  agreements for the purpose of
financing private activity economic development projects; and

     WHEREAS,  in furtherance of the purposes of the Act, the Authority proposes
to finance the Costs of the Project more particularly  described in Exhibit A to
the Agreement, to be owned by the Borrower; and

     WHEREAS,  pursuant to and in  accordance  with the Act, the  Authority  has
authorized and undertaken to issue its Bonds pursuant to this Indenture in order
to provide funds to finance the Costs of the Project; and

     WHEREAS,  the Authority has  undertaken to finance the Costs of the Project
by  loaning  the  proceeds  derived  from the sale of the Bonds to the  Borrower
pursuant to the  Agreement,  under  which the  Borrower is required to make Loan
Repayments  sufficient to pay when due the principal  of,  premium,  if any, and
interest on the Bonds and to pay certain other expenses; and

     WHEREAS,  it has been  determined  that the estimated  amount  necessary to
finance the Costs of the Project,  including a portion of the necessary expenses
incidental  to the issuance of the Bonds,  will require the  issuance,  sale and
delivery of the Bonds in the aggregate principal amount of $8,500,000; and

     WHEREAS,  in order to provide for the  authentication  and  delivery of the
Bonds,  to establish and declare the terms and  conditions  upon which the Bonds
are to be issued and  secured,  and to secure the payment of the  principal  and
purchase  price thereof and interest  thereon,  the Authority has authorized the
execution and delivery of this Indenture; and

     WHEREAS,  in order to further secure the payments of principal and purchase
price of and interest on the Bonds,  the  Borrower  has obtained an  irrevocable
direct-pay letter of credit from the Bank; and

     WHEREAS,  all acts and proceedings required by law or necessary to make the
Bonds,  when executed by the Authority  and  authenticated  and delivered by the
Bond  Registrar,  the  valid,  binding  and  legal  special  obligations  of the
Authority, and to constitute this Indenture a valid and binding



<PAGE>



agreement  for the uses and  purposes  herein set forth in  accordance  with its
terms,  have  been  done and  taken,  and the  execution  and  delivery  of this
Indenture has been in all respects duly authorized;

     NOW,  THEREFORE,  THIS  INDENTURE  WITNESSETH,  that in order to secure the
payment of the principal and purchase price of and premium, if any, and interest
on all Bonds at any time issued and Outstanding under this Indenture,  according
to their tenor,  and, on a basis subordinate  thereto,  to secure the Borrower's
obligations  to the Bank under the  Reimbursement  Agreement,  and to secure the
performance  and  observance  of all the covenants  and  conditions  therein and
herein set forth,  and to declare the terms and  conditions  upon and subject to
which the  Bonds are to be issued  and  received,  and in  consideration  of the
premises and of the mutual  covenants  herein  contained and of the purchase and
acceptance  of  the  Bonds  by the  Holders  thereof,  and  for  other  valuable
consideration,  the receipt whereof is hereby  acknowledged,  the Authority does
hereby  covenant and agree with the Trustee,  for the benefit of the  respective
Holders from time to time of the Bonds, as follows:


                                    ARTICLE I

                DEFINITIONS; CONTENT OF CERTIFICATES AND OPINIONS

     SECTION 1.01. Definitions. Unless the context otherwise requires, the terms
defined in this Article  shall,  for all purposes of this  Indenture and for the
purpose of any certificate, opinion or other document herein mentioned, have the
meanings herein specified.  Such definitions are equally  applicable to both the
singular and plural forms of any of the terms defined.  Unless otherwise defined
in this  Indenture,  all terms defined in the Act and used herein shall have the
meanings assigned to such terms in the Act.

Accountant

     "Accountant"  means any firm of independent  certified  public  accountants
selected by the Borrower and reasonably acceptable to the Trustee and the Bank.

Act

     "Act" means Part 10.2 of Division 3 of Title 2 of the California Government
Code (commencing  with Section 15710),  as now in effect and as it may from time
to time hereafter be amended or supplemented.

Act of Bankruptcy

     "Act of  Bankruptcy"  means  the  entry of an order or  decree,  by a court
having  jurisdiction  in the  matter,  for relief  against  the  Borrower or the
Authority in an involuntary case under any applicable bankruptcy,  insolvency or
other  similar  law now or  hereafter  in  effect,  or  appointing  a  receiver,
liquidator,   assignee,  custodian,  trustee,  sequestrator  (or  other  similar
official) of the Borrower or the  Authority  or of any  substantial  part of the
property of either the Borrower or the Authority,  or ordering the winding up or
liquidation  of the  affairs of either the  Borrower  or the  Authority;  or the
institution  or  commencement  by or against the Borrower or the  Authority of a
voluntary or  involuntary  case under any applicable  bankruptcy,  insolvency or
other similar law now or hereafter in effect,  or the consent by it to the entry
of an order for relief against it in any involuntary case under any such law, or
to the  appointment of a receiver,  liquidator,  assignee,  custodian,  trustee,
sequestrator (or other similar  official) of the Borrower or the Authority or of
any substantial part of the property of either the Borrower or the


                                        2

<PAGE>



Authority,  or  the  making  by  either  the  Borrower  or the  Authority  of an
assignment  for the benefit of creditors,  or the failure of it generally to pay
its debts as they become due, or the admission by it in writing of such failure,
or the taking of any action by the Borrower or the Authority in  furtherance  of
any such  action,  or if a receiver of the business or of the property or assets
of the  Borrower or the  Authority  shall be  appointed  by any court,  except a
receiver appointed at the instance or request of the Authority.

Additional Payments

     "Additional  Payments"  means  the  payments  required  to be  made  by the
Borrower pursuant to Sections 4.2(b), (c) and (d) of the Agreement.

Agreement

     "Agreement"  means that certain loan agreement by and between the Authority
and the Borrower,  dated as of August 1, 1997, as originally  executed and as it
may from time to time be  supplemented,  modified or amended in accordance  with
the terms thereof and of this Indenture.

Alternate Credit Facility

     "Alternate  Credit  Facility"  means bond insurance or other similar credit
enhancement facility meeting the requirements of Section 5.7 of the Agreement.

Alternate Fixed Rate

     "Alternate  Fixed  Rate"  shall have the  meaning  ascribed to such term in
Section 2.03.

Alternate Letter of Credit

     "Alternate  Letter of  Credit"  means an  alternate  irrevocable  letter of
credit or  similar  credit  facility  issued  by a  commercial  bank or  savings
institution,  the terms of which,  other than the expiration  date, shall in all
material  respects  be the  same as  those  of the  initial  Letter  of  Credit,
delivered to the Trustee pursuant to Section 5.8 of the Agreement.

Alternate Weekly Rate

     "Alternate  Weekly  Rate" shall have the  meaning  ascribed to such term in
Section 2.02.

Authority

     "Authority" means the California Economic Development Financing Authority.

Authorized Denominations

     "Authorized  Denomination" means (i) prior to the Fixed Rate Date, $100,000
or any  multiple of $5,000 in excess of  $100,000  and (ii) after the Fixed Rate
Date, $5,000 or integral multiples thereof.



                                        3

<PAGE>



Authorized Representative

     "Authorized  Representative" means with respect to the Borrower, the person
or persons at the time  designated to act on behalf of the Borrower by a written
certificate signed by the Borrower,  furnished to the Trustee and the Authority,
containing the specimen signature of each such person.

Available Moneys

     "Available  Moneys" means moneys which are (a) continuously on deposit with
the Trustee in trust for a period of 91 days for the benefit of the  Bondholders
in a separate and segregated account in which only Available Moneys are held and
(b) proceeds of (i) the Bonds received  contemporaneously  with the issuance and
sale of the Bonds,  (ii) a drawing  under the Letter of Credit,  (iii) any other
moneys  for which the  Trustee  has  received a written  opinion  of  nationally
recognized  counsel  experienced  in  bankruptcy  matters and  acceptable to the
Trustee to the effect that payment of such moneys to the  Bondholders  would not
constitute  an  avoidable  preference  under  Section  547 of the United  States
Bankruptcy  Code in the event the  Authority,  the Borrower or any Related Party
were to become a debtor under the United States  Bankruptcy  Code, which opinion
is  acceptable  to each  rating  agency  then  rating the Bonds,  or (iv) moneys
derived from the  investment of funds  qualifying as Available  Moneys under the
foregoing clauses.

Bank

     "Bank" means The Sumitomo  Bank,  Limited,  acting  through its Los Angeles
Branch,  or any other commercial bank or other financial  institution  issuing a
Letter of Credit then in effect and party to a Reimbursement Agreement.

Beneficial Owners

     "Beneficial Owner" means any person which has or shares the power, directly
or indirectly,  to make investment  decisions  concerning ownership of any bonds
(including  persons  holding  Bonds  through  nominees,  depositories  or  other
intermediaries).

Bond

     "Bond" or "Bonds"  means any Bond or all of the Bonds,  as the case may be,
of the Authority  authorized and issued by the Authority,  authenticated  by the
Bond Registrar and delivered hereunder.

Bond Counsel

     "Bond Counsel" means any attorney at law or firm of attorneys of nationally
recognized  standing in matters  pertaining  to the  exclusion of interest  from
gross  income for  federal  income tax  purposes  on bonds  issued by states and
political  subdivisions,  and duly  admitted to practice  law before the highest
court of any state of the  United  States  of  America,  but  shall not  include
counsel for the Borrower.

Bond Payment Date

     "Bond Payment Date" means any date on which any principal of, or premium or
interest on, any  Outstanding  Bond shall be due and payable whether at maturity
or on a scheduled Interest


                                        4

<PAGE>



Payment Date or upon  redemption,  in each case in accordance  with the terms of
the Bonds and this Indenture.

Bond Registrar

     "Bond Registrar" shall mean the Bond Registrar specified in Section 2.07.

Borrower

     "Borrower" means Advanced Aerodynamics and Structures,  Inc., a corporation
duly organized and validly existing under the laws of the State of Delaware,  or
any entity which is the surviving, resulting or transferee entity in any merger,
consolidation  or  transfer  of  assets  permitted  under  Section  5.2  of  the
Agreement.

Business Day

     "Business Day" means a day which is not a Saturday, Sunday or legal holiday
on which  banking  institutions  in the State or the State of New York or in any
state in which the principal office of the Bank, the Tender Agent or the Trustee
or the  office of the Bank  designated  for  presentations  under the  Letter of
Credit is located  are closed or a day on which the New York Stock  Exchange  is
closed.

Certificate,  Statement,  Request,  Requisition or Order of the Authority or the
Borrower

     "Certificate,"  "Statement,"  "Request,"  "Requisition"  and "Order" of the
Authority or the Borrower means, respectively, a written certificate, statement,
request,  requisition  or order signed in the name of the Authority by the Chair
of the  Authority or such other person as may be  designated  in a resolution as
authorized  to sign  for the  Authority,  or in the name of the  Borrower  by an
Authorized  Representative  of the Borrower.  Any such instrument and supporting
opinions or representations,  if any, may, but need not, be combined in a single
instrument with any other instrument, opinion or representation,  and the two or
more so combined shall be read and construed as a single  instrument.  If and to
the extent  required by Section  1.02,  each such  instrument  shall include the
statements provided for in Section 1.02.

Code

     "Code"  means the Internal  Revenue  Code of 1986,  as amended from time to
time,  and any  regulations  from time to time  promulgated  or deemed in effect
thereunder.

Component Issues

     "Component Issues" means five or more issues of securities, the interest on
which is  Tax-exempt,  selected  by the  Remarketing  Agent in  accordance  with
Section 2.03(B)(1).

Construction

     "Construction"  means,  with  respect  to  the  Project,  the  acquisition,
construction, installation,  rehabilitation,  expansion, improvement, equipping,
furnishing,  or other  activities  with respect to the Project  described in the
Borrower's application for financing assistance from the Authority.



                                        5

<PAGE>



Costs of Issuance

     "Costs of  Issuance"  means all items of  expense  directly  or  indirectly
payable by or  reimbursable  to the Authority or the Borrower and related to the
authorization,  issuance,  sale and  delivery  of the Bonds,  including  but not
limited  to  costs  of  preparation  and  reproduction  of  documents,  printing
expenses,  application,  filing and recording fees,  initial fees and charges of
the Trustee and Tender  Agent,  legal fees and charges,  including  the fees and
charges  of  Bond  Counsel,   fees  and   disbursements   of   consultants   and
professionals,  rating agency fees, fees and charges for preparation,  execution
and  safekeeping  of the Bonds and any other cost,  charge or fee in  connection
with the original  issuance of the Bonds which  constitutes a "cost of issuance"
within the meaning of Section 147(g) of the Code.

Costs of Issuance Fund

     "Costs of Issuance Fund" means the fund of that name  established  pursuant
to Section 3.03(E).

Costs of the Project

     "Costs of the  Project"  means and  shall be deemed to  include  all of the
costs of the  Construction of the Project,  to the extent  permitted by the Act,
whether incurred prior to or after the date of the Agreement, including, but not
limited to the following (but not including any Costs of Issuance):

     (1) the cost of construction, improvement, repair and reconstruction;

     (2) the cost of acquisition,  including  rights in land and other property,
both real and personal and improved and unimproved, and franchises, and disposal
rights;

     (3) the cost of  demolishing,  removing,  or  relocating  any  buildings or
structures  on lands so acquired,  including  the cost of acquiring any lands to
which such buildings or structures may be moved or relocated;

     (4) the cost of machinery,  equipment and  furnishings,  of engineering and
architectural  surveys and plans, and  specifications  and of transportation and
storage until the Project is operational;

     (5) the cost of  agents  or  consultants,  including,  without  limitation,
legal, financial,  engineering,  accounting, and auditing, necessary or incident
to the Project and of the  determination as to the feasibility or practicability
of undertaking the Project;

     (6) the  cost of  financing  interest  on the  Bonds  and  fees of the Bank
allocable  to the period  prior to and during  Construction  of the  Project and
reserves for principal and interest and for extensions, enlargements, additions,
repairs, replacements, renovations, and improvements to the Project; and

     (7) the  cost of  financing  the  Project,  and  the  reimbursement  to any
governmental  entity or agency,  or any Person,  of  expenditures  made by or on
behalf of such entity agency or Person in connection with the Project; provided,
that the  Borrower  shall at its own expense  insure,  repair,  and maintain the
Project,  pay such taxes with respect to the Borrower's interest in the property
relating to the Project,  and pay such  assessments  and other public charges on
the Project or shall cause the same to be provided by others to the satisfaction
of the Authority.



                                        6

<PAGE>



Date of Delivery

     "Date of Delivery" means August 5, 1997.

Determination of Taxability

     "Determination  of Taxability"  means the occurrence or existence of any of
the conditions or events more fully  described in Section  8.3(a)(ii) or Section
8.3(a)(iii) of the Agreement.

DTC

     "DTC"  means The  Depository  Trust  Company,  New York,  New York,  or any
successor securities depository.

Event of Default

     "Event of Default" means any of the events specified in Section 7.01.

Expiration Date

     "Expiration  Date" means the stated date upon which the Letter of Credit or
Alternate Letter of Credit shall expire in accordance with its terms.

Fiscal Year

     "Fiscal  Year" means the fifty two (or fifty  three) week period  ending on
the last  Saturday of December of each year,  or any other  twelve  month period
selected and designated as the fiscal year of the Borrower.

Fixed Interest Rate

     "Fixed  Interest  Rate" means the interest rate borne by the Bonds from and
after the Fixed Rate Date and determined in accordance with Section 2.03.

Fixed Rate Date

     "Fixed Rate Date" means the date on which the Bonds begin to bear  interest
at the Fixed Interest Rate, which shall be an Interest Payment Date.

Fixed Rate Index

     "Fixed Rate Index" means the interest index  determined by the  Remarketing
Agent pursuant to Section 2.03(B)(1).

Government Obligations

     "Government   Obligations"   means  and  includes  any  of  the   following
securities,  if and to the extent the same are  non-callable  and not subject to
redemption at the option of the issuer, at the time legal for investment: direct
obligations  of, or obligations  the full and timely payment of principal of and
interest  on which are  unconditionally  guaranteed  by,  the  United  States of
America, including obligations


                                        7

<PAGE>



issued or held in book-entry form on the books of the Department of the Treasury
of the United  States of America  and  including a receipt,  certificate  or any
other  evidence  of a  direct  ownership  interest  of  future  payments  in  an
obligation of, or  unconditionally  guaranteed by, the United States of America,
or in specified  portions  thereof held by a custodian  in  safekeeping  for the
holders of such receipt,  certificate or any other evidence of ownership  (which
may  consist  of  specified  portions  of  interest  thereon)  which is rated or
assessed  in the highest  rating  category of Moody's and S&P to the extent each
such rating agency is then rating the Bonds, but excluding any share or interest
in any unitary  investment  trust or mutual fund unless such unitary  investment
trust or mutual  fund is rated or assessed  in the  highest  rating  category of
Moody's and S&P to the extent each such rating agency is then rating the Bonds.

Holder or Bondholder

     "Holder" or  "Bondholder,"  whenever  used  herein with  respect to a Bond,
means the Person in whose name such Bond is registered.

Indenture

     "Indenture" means this Indenture,  as originally executed or as it may from
time  to  time  be  supplemented,  modified,  or  amended  by  any  Supplemental
Indenture.

Information Services

     "Information  Services" means Financial  Information,  Inc.'s "Daily Called
Bond Service," 30 Montgomery Street,  10th Floor, Jersey City, New Jersey 07302,
Attention:  Editor;  Kenny  Information  Service's  "Called  Bond  Service,"  65
Broadway,  16th Floor,  New York,  New York 10006;  Moody's  Investors  Service,
525077 Center Drive,  Suite 150,  Charlotte,  North Carolina  28217,  Attention:
Called  Bond  Department;  and  Standard  and Poor's  "Called  Bond  Record," 25
Broadway,  3rd  Floor,  New  York,  New  York  10004;  or,  in  accordance  with
then-current guidelines of the Securities and Exchange Commission, to such other
addresses  and/or such other  services  providing  information  with  respect to
called  bonds,  or no  such  services,  as  the  Authority  may  designate  in a
certificate of the Authority delivered to the Trustee.

Interest Account

     "Interest  Account"  means the  account  of that name in the  Revenue  Fund
established pursuant to Section 5.02.

Interest Payment Date

     "Interest  Payment  Date"  means (i) on and prior to the Fixed  Rate  Date:
September 2, 1997 and the first Business Day of each calendar month  thereafter,
and (ii)  after  the  Fixed  Rate  Date:  August 1 and  February  1 of each year
commencing on the August 1 or February 1 next succeeding the Fixed Rate Date.

Interest Period

     "Interest Period" means the period from and including the date of the first
authentication  and  delivery of the Bonds to and  including  September 1, 1997,
and,  thereafter,  the period from and including an Interest Payment Date to and
including the day next preceding the  immediately  succeeding  Interest  Payment
Date.


                                        8

<PAGE>




Investment Securities

     "Investment  Securities" means (A) obligations  described in Section 103 of
the Code, the interest on which is Tax-exempt,  including  certificates or units
of or in any entity that (i) is treated as a "grantor trust" under Subchapter J,
Part I, Subpart E of the Code in which the  certificate  holders or unit holders
are  treated as the owners of all  assets  owned by such trust and (ii)  invests
solely in  obligations  described  in Section 103 of the Code,  the  interest on
which is Tax-exempt; and (B) stock of a "qualified regulated investment company"
as such term is  defined  in  Section  (a)(2) of  Notice  87-22 of the  Internal
Revenue  Service,   including  qualified  temporary   investments   relating  to
Tax-exempt  obligations  pursuant to paragraph (a) (5) of Notice 87-22 but shall
not include  securities issued by the Authority or the Borrower.  At the time of
investment,  Investment  Securities shall be legal investments under the laws of
the State for the moneys proposed to be invested therein.

Letter of Credit

     "Letter of Credit"  means (i) that certain  Letter of Credit  issued by the
Bank  pursuant  to the  Reimbursement  Agreement,  as the same may be amended or
modified in accordance  with its terms,  naming the Trustee as  beneficiary  and
delivered on the date of issuance  and delivery of the Bonds,  (ii) in the event
of delivery of an Alternate  Letter of Credit,  such Alternate Letter of Credit,
or  (iii)  in the  event of  delivery  of an  Alternate  Credit  Facility,  such
Alternate Credit Facility.

Letter of Credit Account

     "Letter of Credit  Account"  means the account of that name  established in
the Revenue Fund pursuant to Section 5.03.

Letter of Credit Substitution

     "Letter of Credit  Substitution"  means the  substitution  of an  alternate
Letter of Credit for the then existing  Letter of Credit pursuant to Section 5.8
of the Agreement.

Letter of Credit Substitution Date

     "Letter of Credit  Substitution Date" means the date an Alternate Letter of
Credit is delivered to the Trustee pursuant to Section 5.8 of the Agreement.

Liquidity Account

     "Liquidity  Account"  means the  account  of that name  established  in the
Purchase Fund pursuant to Section 8.10.

Loan

     "Loan" means the loan of the proceeds of the Bonds made by the Authority to
the Borrower pursuant to the Agreement.

Loan Default Event

     "Loan  Default  Event"  means any one or more of the  events  specified  in
Section 7.1 of the Agreement.


                                        9

<PAGE>




Loan Repayments

     "Loan  Repayments"  means the payments  required to be made by the Borrower
pursuant to Section 4.2(a) of the Agreement.

Mandatory Tender Date

     "Mandatory  Tender  Date"  shall  mean the (i) Fixed Rate Date and (ii) any
Letter of Credit  Substitution Date, pursuant to which the Bonds are required to
be tendered for purchase in accordance with Section 4.07 hereof.

Moody's

     "Moody's"  means Moody's  Investors  Service,  a corporation  organized and
existing  under  the laws of the State of  Delaware,  its  successors  and their
assigns,  or, if such  corporation  shall be dissolved or liquidated or shall no
longer perform the functions of a securities rating agency, any other nationally
recognized  securities  rating  agency  designated  by the  Authority,  with the
approval of the Borrower, which is requested to provide a rating on the Bonds.

Net Proceeds

     "Net  Proceeds"  means  the  proceeds  from  insurance  or from  actual  or
threatened  condemnation  or eminent  domain action with respect to the Project,
less any costs reasonably expended by the Borrower to receive such proceeds.

Non-Tendered Bonds

     "Non-Tendered  Bonds"  shall  have the  meaning  ascribed  to such  term in
Section 4.07.

Opinion of Counsel

     "Opinion of Counsel" means a written opinion of counsel (who may be counsel
for the  Authority)  selected by the Borrower and the  Authority.  If and to the
extent required by the provisions of Section 1.02, each Opinion of Counsel shall
include the statements provided for in Section 1.02.

Organization Documents

     "Organization  Documents" mean the Borrower's  Certificate of Incorporation
and Bylaws, as amended from time to time.

Outstanding

     "Outstanding," when used as of any particular time with reference to Bonds,
means  (subject to the provisions of Section  11.10) all Bonds  theretofore,  or
thereupon  being,  authenticated  and delivered by the Bond Registrar under this
Indenture  except  (1) Bonds  theretofore  cancelled  by the Bond  Registrar  or
surrendered  to the Bond Registrar for  cancellation;  (2) Bonds with respect to
which  liability of the Authority  shall have been discharged in accordance with
Section  10.02,  including  Bonds (or portions of Bonds)  referred to in Section
11.10;  (3)  Bonds  for  the  transfer  or  exchange  of  or  in  lieu  of or in
substitution for which other Bonds shall have been  authenticated  and delivered
by the Bond  Registrar  pursuant to this Indenture and (4) Bonds which have been
deemed purchased pursuant to Section 4.07.


                                       10

<PAGE>




Participating Underwriter

     "Participating   Underwriter"   means  any  broker,   dealer  or  municipal
securities  dealer acting as an underwriter  in a primary  offering of municipal
securities subject to Securities and Exchange  Commission Rule 15c2-12 under the
Securities Exchange Act of 1934, as amended.

Paying Agent

     "Paying Agent" means, the Trustee, and any other paying agent for the Bonds
appointed pursuant to the provisions of this Indenture.

Permitted Investments

     "Permitted  Investments" means Treasury Funds,  Government  Obligations and
Investment  Securities,  which  are  rated  "AA"  by S&P or  "Aa3"  by  Moody's;
provided, however, that such rating requirement may be waived by the Bank in its
sole discretion.

Person

     "Person" means an individual, corporation, firm, association,  partnership,
trust,  or other legal  entity or group of  entities,  including a  governmental
entity or any agency or political subdivision thereof.

Pledge and Security Agreement

     "Pledge and  Security  Agreement"  means that certain  Custody,  Pledge and
Security Agreement,  dated as of August 1, 1997, by and among the Borrower,  the
Bank  and the  Tender  Agent,  as  custodian,  as the same  may be  amended  and
supplemented from time to time.

Pledged Bonds

     "Pledged Bonds" means Bonds tendered pursuant to Section 4.06 or subject to
mandatory  tender pursuant to Section 4.07 and purchased from funds described in
Section 8.10(B)(ii).

Principal Account

     "Principal  Account"  means the  account of that name in the  Revenue  Fund
established pursuant to Section 5.02.

Project

                  "Project" means (i) all land, buildings,  structures, fixtures
and improvements and (ii) all tangible personal property purchased with proceeds
of the Bonds by the  Borrower,  whether  now  existing  or  hereafter  acquired,
constructed or installed as more fully described in Exhibit A to the Agreement.

Project Fund

     "Project Fund" means the fund of that name established  pursuant to Section
3.03.



                                       11

<PAGE>




Purchase Date

     "Purchase  Date" means (i) the date  specified  in each  notice  given by a
Bondholder  pursuant to Section  4.06 on which the Bonds being  tendered by such
Bondholder  shall be purchased by the Tender Agent and (ii) the Mandatory Tender
Date.

Purchase Fund

     "Purchase Fund" means the fund of that name established pursuant to Section
8.10.

Rebate Fund

     "Rebate Fund" means the fund of that name created pursuant to Section 5.07.

Record Date

     "Record  Date"  means,  prior to the Fixed  Rate  Date,  the  Business  Day
preceding  each  Interest  Payment  Date,  and after the Fixed  Rate  Date,  the
fifteenth (15th) day of the calendar month preceding each Interest Payment Date.

Redemption Account

     "Redemption  Account"  means the  account of that name  established  in the
Revenue Fund pursuant to Section 5.02.

Reimbursement Agreement

     "Reimbursement  Agreement" means the Reimbursement  Agreement,  dated as of
August 1, 1997,  between the Borrower and the Bank (as from time to time amended
or  supplemented),  or any other similar  agreement entered into by the Borrower
and the Bank in connection  with the issuance of any Alternate  Letter of Credit
or Alternate Credit Facility.

Related Party

     "Related Party" means any general partner,  member,  affiliate or guarantor
of the Borrower.

Remarketing Account

     "Remarketing  Account"  means the account of that name  established  in the
Purchase Fund pursuant to Section 8.10.

Remarketing Agent

     "Remarketing  Agent"  means the  remarketing  agent or agents  appointed in
accordance with Section 8.08 hereof.  The  Remarketing  Agent shall be initially
Rauscher Pierce Refsnes,  Inc. "Principal Office" of the Remarketing Agent shall
mean the office thereof designated in writing to the Authority, the Trustee, the
Tender Agent, the Bank and the Borrower.



                                       12

<PAGE>



Remarketing Agreement

     "Remarketing Agreement" means the Remarketing Agreement, dated as of August
1, 1997,  between the Borrower the Remarketing Agent, as such agreement may from
time to time be amended and  supplemented,  to remarket  the Bonds  delivered or
deemed to be  delivered  for  purchase  by the  Holders  thereof,  and any other
similar agreement entered into with any successor  Remarketing Agent, subject to
approval by the Authority.  No such amendment or supplement or similar agreement
shall alter the rights or  obligations  of the Holders of Bonds to deliver their
Bonds for purchase as provided herein.

Revenue Fund

     "Revenue Fund" means the fund of that name established  pursuant to Section
5.01.

Revenues

     "Revenues"  means all amounts  received by the Authority or the Trustee for
the account of the  Authority  pursuant or with respect to the  Agreement or the
Letter of Credit,  including,  without limiting the generality of the foregoing,
Loan  Repayments  (including both timely and delinquent  payments,  and any late
charges,   paid  from  whatever  source),   prepayments,   insurance   proceeds,
condemnation  proceeds,  and all interest,  profits or other income derived from
the  investment of amounts in any fund or account  established  pursuant to this
Indenture, but not including any moneys paid for deposit into the Rebate Fund.

S&P

     "S&P"  means  Standard  &  Poor's  Ratings  Services,  a  division  of  The
McGraw-Hill Companies, Inc., a corporation organized and existing under the laws
of the  State of New  York,  its  successors  and  their  assigns,  or,  if such
corporation  shall be dissolved  or  liquidated  or shall no longer  perform the
functions  of a  securities  rating  agency,  any  other  nationally  recognized
securities rating agency  designated by the Authority,  with the approval of the
Borrower which is requested to provide a rating on the Bonds.

Securities Depositaries

     "Securities   Depositaries"  means  the  following  registered   securities
depositaries: (i) The Depository Trust Company, 711 Stewart Avenue, Garden City,
New York 11530,  Fax-(516)  227-4039 or 4190; and (ii)  Philadelphia  Depository
Trust  Company,  Reorganization  Division,  1900  Market  Street,  Philadelphia,
Pennsylvania  19103,  Attention:  Bond Department,  Fax-(215)  496-5058;  or, in
accordance  with   then-current   guidelines  of  the  Securities  and  Exchange
Commission,  to such other addresses and/or such other securities  depositories,
or no  such  depositories,  as the  Authority  or the  Securities  and  Exchange
Commission  may  designate in a certificate  of the  Authority  delivered to the
Trustee.

Special Record Date

     "Special Record Date" means the date established by the Trustee pursuant to
Section 2.02(B)(2) as a record date for the payment of defaulted interest on the
Bonds.



                                       13

<PAGE>



State

     "State" means the State of California.

Supplemental Indenture

     "Supplemental  Indenture" means any indenture hereafter duly authorized and
entered into between the Authority and the Trustee, supplementing,  modifying or
amending this  Indenture;  but only if and to the extent that such  Supplemental
Indenture is specifically authorized hereunder.

Tax Regulatory Agreement

     "Tax Regulatory Agreement" means the Tax Regulatory Agreement,  dated as of
August 1, 1997, among the Authority,  the Borrower and the Trustee,  as such Tax
Regulatory Agreement shall be amended from time to time.

Tax-exempt

     "Tax-exempt"  means, with respect to interest on any obligations of a state
or local  government,  including the Bonds,  that such interest is excluded from
gross income for federal income tax purposes (other than in the case of a Holder
of any Bonds who is a  substantial  user of the  Project or a  "related  person"
within  the  meaning  of Section  147(a) of the Code) but such  interest  may be
includable  as an item of tax  preference  or otherwise  includable  directly or
indirectly  for  purposes  of  calculating   tax   liabilities,   including  any
alternative minimum tax or environmental tax, under the Code.

Tender Agent

     "Tender Agent" means First Trust of  California,  National  Association,  a
national banking  association  organized and existing under and by virtue of the
laws of the United States of America having a principal  corporate  trust office
at 101 California  Street,  Suite 1150, San Francisco,  California 94111, or any
successor appointed pursuant to Section 8.14.

Treasury Funds

     "Treasury  Funds" means (i) any investment  portfolio  consisting of direct
obligations of the United States Treasury  Department and repurchase  agreements
in  respect  of  those  obligations,  including  any such  investment  portfolio
maintained by the Trustee or the Bank, (ii) any investment or security permitted
pursuant to Section  53601 of the  California  Government  Code,  including  any
investment  or  security  portfolio  consisting  of any  one  or  more  of  such
investments or securities and (iii) any other  investment or security  permitted
by law and approved by the Bank.

Trustee

     "Trustee" means First Trust of California, National Association, a national
banking  association  organized and existing  under and by virtue of the laws of
the United States of America  having a principal  corporate  trust office in San
Francisco,  California,  or its  successor  as Trustee  hereunder as provided in
Section 8.01.



                                       14

<PAGE>



Weekly Interest Rate

     "Weekly  Interest  Rate" means the  interest  rate on the Bonds  determined
pursuant to Section 2.02(C).

     SECTION 1.02.  Content of Certificates and Opinions.  Every  certificate or
opinion  provided  for in this  Indenture  with respect to  compliance  with any
provision  hereof shall include (1) a statement that the Person making or giving
such  certificate or opinion has read such provision and the definitions  herein
relating  thereto;  (2) a brief  statement  as to the  nature  and  scope of the
examination or investigation upon which the certificate or opinion is based; (3)
a statement  that,  in the opinion of such  Person,  he has made or caused to be
made such  examination or investigation as is necessary to enable him to express
an  informed  opinion  with  respect to the  subject  matter  referred to in the
instrument to which his signature is affixed; (4) a statement of the assumptions
upon which such  certificate or opinion is based,  and that such assumptions are
reasonable;  and (5) a statement  as to whether,  in the opinion of such Person,
such provision has been complied with.

     Any  such  certificate  or  opinion  made or  given  by an  officer  of the
Authority or an officer or an Authorized  Representative  of the Borrower may be
based,  insofar  as it  relates to legal,  accounting  or primary  matter of the
business of either of them,  upon a certificate or opinion of or  representation
by counsel, an Accountant or a management consultant, unless such officer knows,
or in the exercise of reasonable care should have known,  that the  certificate,
opinion  or  representation   with  respect  to  the  matters  upon  which  such
certificate  or statement  may be based,  as aforesaid,  is erroneous.  Any such
certificate  or opinion made or given by counsel,  an Accountant or a management
consultant may be based,  insofar as it relates to factual matters (with respect
to which  information is in the possession of the Authority or the Borrower,  as
the  case may be) upon a  certificate  or  opinion  of or  representation  by an
officer of the  Authority or the Borrower,  unless such  counsel,  Accountant or
management  consultant  knows, or in the exercise of reasonable care should have
known,  that the  certificate or opinion or  representation  with respect to the
matters upon which such Person's certificate or opinion or representation may be
based,  as  aforesaid,  is  erroneous.  The same officer of the Authority or the
Borrower,  or the same counsel or Accountant or  management  consultant,  as the
case may be,  need not certify to all of the  matters  required to be  certified
under  any  provision  of  this  Indenture,  but  different  officers,  counsel,
Accountants  or  management   consultants  may  certify  to  different  matters,
respectively.

     SECTION 1.03.  Interpretation.  (A) Unless the context otherwise indicates,
defined terms shall include all  variations  thereof and words  expressed in the
singular  shall  include  the plural  and vice versa and the use of the  neuter,
masculine,  or feminine  gender is for  convenience  only and shall be deemed to
mean and include the neuter, masculine or feminine gender, as appropriate.

     (B)  Headings of  articles  and  sections  herein and the table of contents
hereof are solely for convenience of reference,  do not constitute a part hereof
and shall not affect the meaning, construction or effect hereof.

     (C)  Unless  otherwise  indicated,  all  references  herein to  "Articles,"
"Sections" and other subdivisions are to the corresponding Articles, Sections or
subdivisions  of  this  Indenture;   the  words  "herein,"  "hereof,"  "hereby,"
"hereunder" and other words of similar import refer to this Indenture as a whole
and not to any particular Article, Section or subdivision hereof.




                                       15

<PAGE>



                                   ARTICLE II

                                    THE BONDS

     SECTION  2.01.  Authorization  of Bonds.  There  shall be issued  under and
secured  by this  Indenture  a  single  series  of  Bonds  to be  designated  as
"California  Economic  Development  Financing  Authority  Variable  Rate  Demand
Industrial  Development  Revenue Bonds,  Series 1997 (Advanced  Aerodynamics and
Structures, Inc. Project)" in the original principal amount of $8,500,000, to be
dated  as of the  Date of  Delivery,  and to  mature  fully  (subject  to  prior
redemption at the prices and dates and upon the terms and conditions hereinafter
set forth) on August 1, 2027.

     SECTION  2.02.  Terms of the Bonds.  (A) The Bonds shall be issued as fully
registered  Bonds without  coupons in the  Authorized  Denominations.  The Bonds
shall be in substantially the form set forth in Exhibit A hereto.

     (B)(1) Each Bond shall bear  interest at the rates  determined  pursuant to
Section  2.02(C) and 2.03(B) from and including  the Interest  Payment Date next
preceding the date of registration thereof (unless such Bond is registered after
a Record Date and on or before the next succeeding  Interest  Payment Date or on
an  Interest  Payment  Date,  in which  event it shall  bear  interest  from and
including  such  Interest  Payment Date, or unless such Bond is registered on or
prior to  September  1, 1997,  in which  event it shall bear  interest  from and
including the Date of  Delivery),  payable on each  Interest  Payment Date.  The
interest so payable on any  Interest  Payment  Date will be paid on the Interest
Payment Date to the Persons in whose name the Bonds are  registered at the close
of business of the Bond  Registrar on the Record Date for such Interest  Payment
Date; except as provided below.

     (2) Any such  interest not so  punctually  paid or duly  provided for shall
forthwith  cease to be  payable  to the  Holder as of the  Record  Date for such
payment of  interest,  and shall be paid to the Person in whose name the Bond is
registered at the close of business on a Special  Record Date for the payment of
such defaulted interest, to be fixed by the Trustee,  notice thereof being given
to the Holders not less than ten (10) days prior to such Special Record Date.

     (3) Interest shall be paid in lawful money of the United States by check or
draft  mailed to each  Holder at the  address  shown on the  registration  books
maintained by the Bond Registrar  pursuant to Section 2.07;  provided,  however,
interest  may also be paid by wire  transfer  to an address  in the  continental
United States in the case of a Holder of at least $1,000,000 aggregate principal
amount of Bonds upon written  request of the Holder thereof 15 days prior to the
applicable  Record Date to the Bond Registrar in a form satisfactory to the Bond
Registrar.

     (C)(1) The Bonds shall bear interest until payment of the principal thereof
and interest thereon shall have been made or provided for in accordance with the
provisions hereof, whether at maturity,  upon redemption or otherwise.  Prior to
the Fixed Rate Date, interest shall be computed on the basis of a year of 365 or
366 days, as appropriate, for the actual number of days elapsed.

     The Bonds shall bear  interest for each day from and  including the Date of
Delivery until the Fixed Rate Date or final maturity date, whichever is earlier,
at the Weekly Interest Rate;  provided that appropriate  adjustments may be made
for the initial period following the Date of Delivery.  The Weekly Interest Rate
shall be the rate  determined  by the  Remarketing  Agent  (on the  basis of the
examination  of  Tax-exempt  obligations  comparable  to the Bonds  known by the
Remarketing  Agent to have been priced or traded  under then  prevailing  market
conditions) to be the minimum interest rate which, if borne by the Bonds,  would
enable the Remarketing Agent to sell the Bonds on the date such


                                       16

<PAGE>



rate becomes  effective at a price equal to the principal  amount thereof,  plus
accrued  interest,  if any, but in no event  exceeding  twelve percent (12%) per
annum. The Weekly Interest Rate shall be determined by the Remarketing  Agent as
of the close of business on Tuesday in each  calendar  week until the earlier of
the Fixed Rate Date or payment in full of the Bonds;  provided  that, if Tuesday
in any calendar week shall not be a Business Day, then such determination  shall
be  made  on  the  next  preceding  Business  Day;  and  provided  further  that
appropriate adjustments may be made for the initial period following the Date of
Delivery. The Weekly Interest Rate shall be effective from Wednesday in the week
of determination  thereof to and including the following Tuesday irrespective of
when the rate was determined by the Remarketing Agent; provided that appropriate
adjustments  may be made for the initial period  following the Date of Delivery.
The Weekly Interest Rate shall be communicated  by telephonic  notice,  promptly
confirmed in writing,  by the  Remarketing  Agent to the Trustee on the Business
Day next following the day on which the Weekly Interest Rate is determined.  The
Remarketing  Agent shall also give written notice to the Tender Agent,  the Bank
and the Borrower of the Weekly  Interest Rate at the time it gives the aforesaid
written  confirmation  thereof to the Trustee. If for any reason the Remarketing
Agent  does not  determine  the  Weekly  Interest  Rate in any week,  the Weekly
Interest  Rate for the first such week in which the  Remarketing  Agent does not
determine the Weekly Interest Rate shall remain at the last Weekly Interest Rate
announced by the Remarketing Agent and the Weekly Interest Rate thereafter shall
be 90% of the "Alternate Weekly Rate" (as defined below).

     (2) If on any date on which the Weekly  Interest  Rate is  determined,  the
Weekly  Interest  Rate  determined  in  accordance  with  paragraph  (1) of this
paragraph (C) is held by a court to be invalid or unenforceable, then the Weekly
Interest Rate shall be 90% of the Alternate  Weekly Rate. The "Alternate  Weekly
Rate" shall be the A-1/P-1  30-day  commercial  paper rate as  determined by the
Remarketing Agent.

     (3) Each determination of the Weekly Interest Rate by the Remarketing Agent
shall be conclusive and binding on the Holders, the Trustee and the Authority.

     The Trustee  shall  calculate  the amount of interest due on each  Interest
Payment Date with respect to the then-concluding Interest Period by the close of
business  on the date one (1)  Business  Day  prior to the end of such  Interest
Period,  and shall notify the Borrower and the Bank of such amount.  The Trustee
shall inform any Bondholder who requests the same of the Weekly Interest Rate in
effect from time to time.

     (4) Anything herein to the contrary notwithstanding,  in no event shall the
interest  rate borne by the Bonds exceed  twelve  percent (12%) per annum or, if
lower,  the maximum rate of interest which may be charged or collected  pursuant
to applicable provisions of federal or state law.

     (D) The  principal  of the Bonds  shall be payable  in lawful  money of the
United  States of America  on August 1, 2027 at the  principal  corporate  trust
office of the Trustee in San  Francisco,  California  or at such other office as
the Trustee may  designate.  Except as provided in Section  2.09,  no payment of
principal  shall be made on any Bond  unless and until such Bond is  tendered to
the Trustee for cancellation, as the case may be.

     (E) The Bonds shall be subject to  redemption  and  purchase as provided in
Article IV.

     SECTION 2.03.  Conversion of Bonds.  (A) On any Interest  Payment Date, the
interest  rate on the Bonds may be  converted to a fixed annual rate of interest
upon receipt by the Authority,  the Trustee,  the Tender Agent, the Bank and the
Remarketing  Agent not less than 45 days in advance of the  proposed  Fixed Rate
Date of (i) notice from the Borrower  electing to have the interest  rate on the
Bonds


                                       17

<PAGE>



converted to a fixed rate of interest and the effective date of such conversion,
(ii) an opinion of Bond  Counsel  (which  shall be  confirmed  on the Fixed Rate
Date) to the effect that conversion to a Fixed Interest Rate is permitted by the
Indenture and the Act, that  conversion to the Fixed Interest Rate in accordance
with the provisions of the Indenture will not cause interest on the Bonds to not
be Tax-exempt and that, to the extent  required,  the Borrower has complied with
the Disclosure Requirements as provided in Section 5.12 of the Agreement,  (iii)
receipt by the Trustee of a commitment  from the Bank evidencing that the Letter
of Credit has been increased to provide for the interest,  principal and premium
requirements  on the  Bonds on and after  the  Fixed  Rate Date or an  Alternate
Credit  Facility  pursuant  to the terms of Section 5.7 of the  Agreement  or an
Alternate  Letter  of  Credit  pursuant  to  the  terms  of  Section  5.8 of the
Agreement,  (iv) the  written  consent  of the Bank to such  conversion  and (v)
receipt by the Trustee of written  evidence  from the rating  agency then rating
the Bonds of its rating on the Bonds.

     (B)(1)  After the Fixed Rate Date,  interest on the Bonds shall be computed
on the basis of a year of 360 days and 12 months of 30 days each.  The  interest
rate on all  Bonds  from  the  Fixed  Rate  Date  until  the  maturity  or prior
redemption or acceleration  thereof shall be a rate per annum equal to the Fixed
Interest  Rate,  which shall be  determined on or prior to, but not more than 15
days prior to, the Business Day  immediately  preceding the Fixed Rate Date. The
Remarketing Agent shall specify the Fixed Interest Rate to be borne by the Bonds
on and after the Fixed Rate Date. The Fixed Interest Rate shall be the rate, but
not  exceeding  the  rate,  which at the time of  determination  thereof  in the
judgment of the Remarketing  Agent,  having due regard for prevailing  financial
market conditions,  would be necessary to remarket the Bonds at a price equal to
100% of the principal  amount  thereof on the Fixed Rate Date. If on the date of
determination  by the  Remarketing  Agent of the Fixed  Interest Rate, the Fixed
Interest Rate so  determined is held by a court to be invalid or  unenforceable,
then the Fixed  Interest  Rate  shall be a rate  determined  by the  Remarketing
Agent,  not less than 90% or more than 130% of the "Alternate Fixed Rate," which
in the  judgment  of the  Remarketing  Agent,  having due regard for  prevailing
market conditions, would be the minimum rate at which Holders of the Bonds would
be able to sell the Bonds at a price equal to the  principal  amount  thereof on
the Fixed Rate  Date.  The  Alternate  Fixed  Rate  shall be  determined  by the
Remarketing  Agent and shall be a rate per annum based upon yield evaluations at
par of  Tax-exempt  securities  having a  remaining  term  equal,  as  nearly as
practicable,  to the time remaining  until the maturity of the Bonds of not less
than five Component Issues selected by the Remarketing Agent each of which would
be rated by either Moody's or S&P in a long-term  debt rating  category which is
the same as, or is immediately  proximate to, the long-term debt rating category
which will be assigned  to the Bonds after the Fixed Rate Date.  Anything to the
contrary herein notwithstanding, the Fixed Interest Rate shall not exceed twelve
percent (12%) per annum.  If, after the Fixed Rate Date, the Bonds shall fail to
be converted to a Fixed  Interest Rate, the Bonds will continue to earn interest
at the Weekly  Interest Rate as provided in this Indenture and the Holders shall
be notified thereof by the Trustee.

     (2)  Following an election of the Borrower to convert the interest  rate on
the Bonds to the Fixed  Interest  Rate as provided  in this  Section  2.03,  the
Holders of all of the Outstanding  Bonds shall be required to tender their Bonds
for purchase on the Mandatory Tender Date.

     (3) At least  thirty  (30) days prior to the Fixed Rate Date,  the  Trustee
shall give an irrevocable  notice to the Bondholders of conversion of the Weekly
Interest  Rate borne by the Bonds to the Fixed  Interest  Rate on the Fixed Rate
Date. If a Bondholder delivers a written request to the Trustee at least 45 days
prior to the Fixed Rate Date setting forth the  appropriate  telex or telecopier
number and other  necessary  information  to enable the Trustee to deliver  such
notice by telegram,  telex, telecopier or other telecommunication device capable
of  creating a written  notice  such  notice  shall be  delivered  in the manner
requested.  Such notice  shall (i) specify the  proposed  Fixed Rate Date,  (ii)
require the Holders of all of the  Outstanding  Bonds to tender  their Bonds for
purchase on the Mandatory Tender Date


                                       18

<PAGE>



pursuant  to  Section  4.07,  and (iii)  state  that all  Outstanding  Bonds not
purchased on or before the Mandatory  Tender Date will be deemed to be purchased
on the Mandatory  Tender Date at a price equal to the principal  amount thereof,
plus unpaid interest, if any, accrued to such date.

     (4) Any Bond  purchased by the Tender Agent  pursuant to the  provisions of
Section  4.06  hereof from the date  notice of the  proposed  Fixed Rate Date is
given to  Bondholders  through  the Fixed Rate Date shall be  remarketed  at the
Weekly  Interest  Rate for a period of time up to and  including  the Fixed Rate
Date; provided,  however,  that all Bonds remarketed from the date notice of the
proposed  Fixed Rate Date is given to  Bondholders  through  the Fixed Rate Date
shall be tendered by the Holders  thereof for purchase on the  Mandatory  Tender
Date.

     (5) The  determination of the Fixed Interest Rate by the Remarketing  Agent
shall be conclusive and binding on the Authority,  the Trustee, the Borrower and
the Holders of the Bonds.

     SECTION 2.04.  Execution of Bonds.  The Bonds shall be executed in the name
and on behalf of the  Authority  with the manual or  facsimile  signature of the
Chair of the  Authority  or the Chair's  designee  and attested by the manual or
facsimile  signature of its Secretary.  The Bonds shall then be delivered to the
Bond Registrar for  authentication  by it. In case any of the officers who shall
have  signed or  attested  any of the Bonds  shall  cease to be such  officer or
officers of the Authority before the Bonds so signed or attested shall have been
authenticated  or  delivered by the Bond  Registrar or issued by the  Authority,
such Bonds may  nevertheless  be  authenticated,  delivered and issued and, upon
such authentication,  delivery and issue, shall be as binding upon the Authority
as though  those who  signed  and  attested  the same had  continued  to be such
officers  of the  Authority,  and also any Bonds may be signed and  attested  on
behalf of the  Authority  by such  persons as at the actual date of execution of
such Bonds shall be the proper officers of the Authority although at the nominal
date of such  Bonds any such  person  shall not have  been such  officer  of the
Authority.

     Only  such  of  the  Bonds  as  shall  bear   thereon  a   certificate   of
authentication substantially in the form set forth in Exhibit A, with the manual
signature of the Bond Registrar, shall be valid or obligatory for any purpose or
entitled to the benefits of this  Indenture,  and such  certificate  of the Bond
Registrar shall be conclusive evidence that the Bonds so authenticated have been
duly  executed,  authenticated  and delivered  hereunder and are entitled to the
benefits of this Indenture.

     SECTION  2.05.  Transfer  of Bonds.  Any Bond may, in  accordance  with its
terms,  be  transferred,  upon the books  required  to be kept  pursuant  to the
provisions  of Section 2.07,  by the person in whose name it is  registered,  in
person or by his duly  authorized  attorney,  upon surrender of such  registered
Bond for  cancellation,  accompanied  by  delivery  of a written  instrument  of
transfer, duly executed in a form approved by the Bond Registrar.  Transfer of a
Bond shall not be permitted by the Bond Registrar: (i) if the Bond Registrar has
received notice from the Holder of such Bond that such Bond will be delivered to
the Tender Agent for purchase on or before the next succeeding  Interest Payment
Date or (ii) if the Bond Registrar  receives such written instrument of transfer
after the Record Date prior to the next succeeding Interest Payment Date.

     Whenever any Bond or Bonds shall be surrendered for transfer, the Authority
shall execute and the Bond Registrar shall  authenticate  and deliver a new Bond
or Bonds for a like aggregate  principal  amount in an Authorized  Denomination.
The Bond Registrar shall require the Bondholder  requesting such transfer to pay
any tax or other  governmental  charge  required to be paid with respect to such
transfer,  and may in addition  require the payment of a reasonable sum to cover
expenses  incurred by the  Authority and the Bond  Registrar in connection  with
such transfer.



                                       19

<PAGE>



     Notwithstanding the foregoing,  prior to the Fixed Rate Date, no Bonds held
by or for the account of the Bank or the Borrower shall be transferred  upon the
books required to be kept pursuant to Section 2.07 hereof unless the Trustee has
received positive affirmation that the Bank has received all reimbursements then
due under the  Reimbursement  Agreement  and the Trustee has notified the Tender
Agent in writing  of such  reimbursement,  so that the amount  that may be drawn
under the  Letter of Credit  shall have been,  or shall  concurrently  with such
transfer be, reinstated  (automatically or otherwise), in the amount of the draw
on the Letter of Credit used to purchase such Bonds proposed to be transferred.

     SECTION  2.06.  Exchange of Bonds.  Bonds may be exchanged at the principal
corporate trust office of the Trustee in San Francisco,  California,  or at such
other office as the Trustee may designate, for a like aggregate principal amount
of Bonds of other Authorized Denominations. The Bond Registrar shall require the
Bondholder requesting such exchange to deliver such Bonds to be exchanged and to
pay any tax or other  governmental  charge  required to be paid with  respect to
such  exchange,  and may in addition  require the payment of a reasonable sum to
cover  expenses  incurred by the  Authority or the Bond  Registrar in connection
with such  exchange.  Thereupon,  the Bonds  delivered to the Bond Registrar for
exchange shall be cancelled by the Bond Registrar.

     SECTION 2.07. Bond Register. The Trustee is hereby designated and appointed
as the bond  registrar (the "Bond  Registrar").  The Bond Registrar will keep or
cause to be kept at its corporate trust office in San Francisco,  California, or
at such other office as the Bond Registrar may designate,  sufficient  books for
the  registration  and transfer of the Bonds, and shall keep or cause to be kept
within  the  State a copy of such  books,  which  shall at all  times be open to
inspection   during  regular   business  hours  by  the  Authority;   and,  upon
presentation for such purpose,  the Bond Registrar shall,  under such reasonable
regulations as it may prescribe,  register or transfer or cause to be registered
or transferred, on such books, Bonds as hereinbefore provided.

     SECTION 2.08.  Temporary  Bonds.  The Bonds may be issued in temporary form
exchangeable  for definitive  Bonds when ready for delivery.  Any temporary Bond
may  be  printed,  lithographed  or  typewritten,  shall  be  in  an  Authorized
Denomination,  shall be in fully registered form without coupons and may contain
such  reference to any of the provisions of this Indenture as may be appropriate
and in a form  acceptable to the Paying  Agent.  Every  temporary  Bond shall be
executed by the Authority and be  authenticated  by the Bond  Registrar upon the
same conditions and in substantially the same manner as the definitive Bonds. If
the  Authority  issues  temporary  Bonds it will execute and deliver  definitive
Bonds as promptly  thereafter as practicable,  and thereupon the temporary Bonds
may be  surrendered,  for  cancellation,  in exchange  therefor at the principal
corporate  trust  office  of the Bond  Registrar  and the Bond  Registrar  shall
authenticate and deliver in exchange for such temporary Bonds an equal aggregate
principal  amount of  definitive  Bonds in  Authorized  Denominations.  Until so
exchanged, the temporary Bonds shall be entitled to the same benefits under this
Indenture as definitive Bonds authenticated and delivered hereunder.

     SECTION 2.09. Bonds Mutilated, Lost, Destroyed or Stolen. If any Bond shall
become  mutilated,  the  Authority,  at the  expense of the Holder of said Bond,
shall execute, and the Bond Registrar shall thereupon  authenticate and deliver,
a new Bond of like tenor in exchange and substitution for the Bond so mutilated,
but only upon  surrender to the Bond  Registrar of the Bond so mutilated.  Every
mutilated Bond so surrendered to the Bond Registrar shall be cancelled by it and
delivered  to, or upon the order of, the  Authority.  If any Bond shall be lost,
destroyed  or  stolen,  evidence  of such  loss,  destruction  or  theft  may be
submitted to the Bond Registrar and, if such evidence be  satisfactory to it and
indemnity  satisfactory to the Bond Registrar shall be given, the Authority,  at
the expense of the Holder, shall execute, and the Bond Registrar shall thereupon
authenticate  and  deliver,  a new  Bond  of  like  tenor  in  lieu  of  and  in
substitution  for the Bond so lost,  destroyed  or  stolen  (or if any such Bond
shall have


                                       20

<PAGE>



matured or shall be about to mature,  instead of issuing a substitute  Bond, the
Bond  Registrar  may pay the same without  surrender  thereof upon such maturity
date).  The Bond  Registrar  may  require  payment  by the  Holder  of a sum not
exceeding  the actual cost of preparing  each new Bond issued under this Section
and of the  expenses  which  may be  incurred  by the  Authority  and  the  Bond
Registrar in the premises.  Any Bond issued under the provisions of this Section
in lieu of any Bond alleged to be lost,  destroyed or stolen shall constitute an
original additional  contractual obligation on the part of the Authority whether
or not the  Bond so  alleged  to be lost,  destroyed  or  stolen  be at any time
enforceable  by anyone,  and shall be entitled to the benefits of this Indenture
with all other Bonds secured by this Indenture.

     SECTION 2.10. Special  Obligations.  The Bonds,  together with the interest
and premium (if any) thereon and the purchase price thereof, shall not be deemed
to constitute a debt or liability of the State or any political  subdivision  or
agency of the  State or a pledge  of the  faith  and  credit of the State or any
political  subdivision or agency of the State,  but shall be payable solely from
the funds provided  therefor  pursuant to this  Indenture.  The Bonds are only a
special  obligation  of the  Authority as provided by the Act and the  Authority
shall under no  circumstances  be obligated to pay the Bonds or respective Costs
of the Project except from Revenues and other funds pledged therefor.

     Neither  the  faith and  credit  nor the  taxing  power of the State or any
political  subdivision  or agency of the State is pledged to the  payment of the
principal of, premium, if any, purchase price of or interest on the Bonds nor is
the State or any  political  subdivision  or  agency of the State in any  manner
obligated to make any  appropriation  for such  payment.  The  Authority  has no
taxing power.

     SECTION 2.11.  Book-Entry Only System.  (A) Except as otherwise provided in
subsections (B) and (C) of this Section 2.11, the Bonds initially  authenticated
and  delivered  hereunder  shall be  registered  in the  name of Cede & Co.,  as
nominee of DTC or such other nominee as DTC shall request.  Payments of interest
on,  principal  of and any  premium on the Bonds shall be made to the account of
Cede & Co. on each Bond Payment Date at the address  indicated for Cede & Co. in
the  registration  books  maintained  by  the  Bond  Registrar  by  transfer  of
immediately  available  funds. DTC has represented to the Authority that it will
maintain  a  book-entry   system  in  recording   ownership   interests  of  its
participants  (the  "Direct  Participants")  and the  ownership  interests  of a
purchaser of a beneficial  interest in the Bonds (a "Beneficial  Owner") will be
recorded through book entries on the records of the Direct Participants.

     (B) The Bonds shall be  initially  issued in the form of a separate  single
authenticated  fully  registered  Bond in the  amount  of each  separate  stated
maturity.  With  respect to Bonds so  registered  in the name of Cede & Co., the
Authority,  the Trustee and the Tender  Agent  shall have no  responsibility  or
obligation to any Direct  Participant or to any Beneficial  Owner of such Bonds.
Without limiting the immediately preceding sentence, the Authority,  the Trustee
and the Tender Agent shall have no  responsibility or obligation with respect to
(i) the  accuracy  of the records of DTC,  Cede & Co. or any Direct  Participant
with  respect  to any  beneficial  ownership  interest  in the  Bonds,  (ii) the
delivery to any Direct Participant, Beneficial Owner or other person, other than
DTC,  of any  notice  with  respect  to  the  Bonds,  including  any  notice  of
redemption,  (iii) the payment to any Direct  Participant,  Beneficial  Owner or
other  person,  other than DTC, of any amount with  respect to the  principal or
redemption  price of, or  interest  on, the Bonds or (iv) any  consent  given or
other action taken by DTC as Holder of the Bonds. The Authority, the Trustee and
the Tender  Agent may treat DTC as, and deem DTC to be, the  absolute  Holder of
each Bond for all purposes whatsoever including (but not limited to) (i) payment
of the principal or redemption  price of, and interest on, each such Bond,  (ii)
giving  notices of conversion  or  redemption  and other matters with respect to
such Bonds and (iii)  registering  transfers  with  respect to such  Bonds.  The
Trustee  shall pay the  principal or  redemption  price of, and interest on, all
Bonds only


                                       21

<PAGE>



to or upon the order of DTC, and all such payments  shall be valid and effective
to fully satisfy and discharge the Authority's  obligations with respect to such
principal or redemption price, and interest, to the extent of the sum or sums so
paid. No person other than DTC shall receive a Bond evidencing the obligation of
the Authority to make payments of principal or redemption price of, and interest
on, the Bonds pursuant to this Indenture. Upon delivery by DTC to the Trustee of
written notice to the effect that DTC has determined to substitute a new nominee
in place of Cede & Co., and subject to the transfer  provisions hereof, the word
"Cede & Co." in this Indenture shall refer to such new nominee of DTC.

     (C) (1) DTC may  determine  to  discontinue  providing  its  services  with
respect  to the Bonds at any time by  giving  reasonable  written  notice to the
Authority, the Trustee and the Tender Agent and discharging its responsibilities
with respect thereto under applicable law.

     (2) The  Authority,  in its sole  discretion and without the consent of any
other person, may terminate,  upon provision of notice to the Trustee and Tender
Agent, the services of DTC with respect to the Bonds if the Authority determines
that the continuation of the system of book-entry only transfers through DTC (or
a  successor  securities  depository)  is  not  in  the  best  interests  of the
Beneficial  Owners of the Bonds or is  burdensome  to the  Authority,  and shall
terminate  the  services  of DTC with  respect to the Bonds upon  receipt by the
Authority,  the Trustee and the Tender  Agent of written  notice from DTC to the
effect that DTC has  received  written  notice from Direct  Participants  having
interests,  as shown in the records of DTC, in an aggregate  principal amount of
not less than fifty percent (50%) of the aggregate  principal amount of the then
Outstanding  Bonds to the  effect,  that:  (i) DTC is  unable to  discharge  its
responsibilities  with  respect to such  Bonds,  or (ii) a  continuation  of the
requirement that all of the Outstanding  Bonds be registered in the registration
books kept by the  Trustee in the name of Cede & Co.,  as nominee of DTC, is not
in the best interest of the Beneficial Owners of such Bonds.

     (D) Upon the  termination  of the services of DTC with respect to the Bonds
pursuant  to  subsection  (C)(2)(ii)  hereof,  or  upon  the  discontinuance  or
termination  of the  services  of DTC with  respect  to the  Bonds  pursuant  to
subsection  (C)(1) or  subsection  (C)(2)(i)  hereof  after which no  substitute
securities depository willing to undertake the functions of DTC hereunder can be
found  or  which,  in the  opinion  of the  Authority,  is  willing  and able to
undertake such functions upon reasonable and customary terms, the Bonds shall no
longer be restricted to being registered in the  registration  books kept by the
Bond  Registrar in the name of Cede & Co. as nominee of DTC. In such event,  the
Authority  shall  issue  and  the  Trustee  shall  transfer  and  exchange  Bond
certificates  as  requested  by DTC or  Direct  Participants  of like  principal
amount,  series and maturity,  in Authorized  Denominations  to the identifiable
Beneficial Owners in replacement of such Beneficial Owners' beneficial interests
in the Bonds.

     (E)  Notwithstanding any other provision of this Indenture to the contrary,
so long as any Bond is  registered in the name of Cede & Co., as nominee of DTC,
all payments with respect to the principal or redemption  price of, and interest
on, such Bond and all notices with respect to such Bond shall be made and given,
respectively, to DTC.

     (F) In connection with any notice or other  communication to be provided to
Bondholders pursuant to this Indenture by the Authority, the Tender Agent or the
Trustee with respect to any consent or other action to be taken by  Bondholders,
the  Authority,  the  Tender  Agent or the  Trustee,  as the case may be,  shall
establish a record date for such  consent or other action and give DTC notice of
such record date not less than  fifteen  (15)  calendar  days in advance of such
record date to the extent possible.



                                       22

<PAGE>



     (G) Notwithstanding any provision herein to the contrary, the Authority and
the  Trustee  may agree to allow  DTC,  or its  nominee,  Cede & Co.,  to make a
notation on any Bond  redeemed in part to reflect,  for  informational  purposes
only, the principal amount and date of any such redemption.

     (H)  Notwithstanding  any provision herein to the contrary,  so long as the
Bonds are  subject to a system of  book-entry  only  transfers  pursuant to this
Section,  any  requirement  for the  delivery  of Bonds to the  Tender  Agent in
connection  with a mandatory  tender  pursuant  to Section  4.07 shall be deemed
satisfied upon the transfer, on the registration books of DTC, of the beneficial
ownership  interests  in such Bonds  tendered for purchase to the account of the
Tender Agent, or a Direct Participant acting on behalf of the Tender Agent.


                                   ARTICLE III

                   ISSUANCE OF BONDS; APPLICATION OF PROCEEDS

     SECTION  3.01.  Issuance of the Bonds.  At any time after the  execution of
this  Indenture,  the  Authority  may  execute  and  the  Bond  Registrar  shall
authenticate and, upon Request of the Authority,  deliver Bonds in the aggregate
principal amount set forth in Section 2.01.

     SECTION 3.02.  Application of Proceeds of the Bonds. The proceeds  received
from the sale of the Bonds shall be  deposited  in trust with the  Trustee,  who
shall forthwith set aside such proceeds as follows:

     (A) The  Trustee  shall  set  aside  the sum of  $170,000  in the  Costs of
Issuance Fund,  together with any  additional  money supplied by the Borrower to
pay the Costs of  Issuance,  which  Costs of  Issuance  Fund the  Trustee  shall
establish and maintain as further provided in Section 3.03(E) hereof.

     (B) The Trustee shall set aside the remainder of said proceeds, $8,330,000,
in the Project Fund.

     SECTION 3.03.  Establishment  and  Application of Project Fund and Costs of
Issuance  Fund.  (A) The Trustee shall  establish,  maintain and hold in trust a
separate fund  designated as the "Project  Fund." The moneys in the Project Fund
shall be used and withdrawn by the Trustee to pay the Costs of the Project.

     (B) Subject to paragraph (C) of this Section 3.03,  before any payment from
the Project  Fund shall be made to pay any Costs of the  Project,  the  Borrower
shall file or cause to be filed with the Trustee a  Requisition  of the Borrower
stating (i) the item number of such payment; (ii) the name of the Person to whom
each such payment is due, which may be the Borrower in the case of reimbursement
for any  Costs  of the  Project  theretofore  paid by the  Borrower;  (iii)  the
respective  amounts to be paid; (iv) the purpose by general  classification  for
which each  obligation  to be paid was  incurred;  (v) that  obligations  in the
stated  amounts are  presently  due and payable and that each item  thereof is a
proper  charge  against the Project Fund and has not been  previously  paid from
said fund or from the  proceeds  of the Bonds;  and (vi) that there has not been
filed with or served upon the Borrower  notice of any lien, or attachment  upon,
or claim  affecting the right to receive  payment of, any of the amounts payable
to any of the persons named in such Requisition,  which has not been released or
will not be released  simultaneously with the payment of such obligation,  other
than materialmen's or mechanics' liens accruing by mere operation of law.


                                       23

<PAGE>




     Upon  receipt of each  Requisition,  the  Trustee  shall pay the amount set
forth in such  Requisition  as directed by the terms  thereof out of the Project
Fund. The Trustee may, upon  satisfaction  by the Borrower of the conditions set
forth in this Section 3.03(B), pay each Requisition without the written approval
of the Bank unless the Trustee has  received  written  notice from the Bank that
the payment of any subsequent  Requisition requires the Bank's written approval.
The  Trustee  shall not make any such  payment  if it has  theretofore  received
notice of any lien,  right to lien or attachment  upon,  or claim  affecting the
right to receive payment of, any of the moneys to be so paid, which has not been
released or will not be released simultaneously with such payment.

     (C) In the event the Borrower elects to invest any moneys on deposit in the
Project Fund in Permitted  Investments other than Investment Securities pursuant
to Section 5.05 of this  Indenture,  the Trustee shall,  prior to the payment of
any  Requisition  which would  result in the amount  remaining on deposit in the
Project Fund being less than 2% of the  principal  amount of the Bonds set forth
in Section 2.01,  notify the Borrower that a rebate  calculation  is required to
determine the Rebate Requirement (as defined in the Tax Regulatory Agreement) in
accordance with Section 5.07 of this Indenture. In addition, the payment of such
Requisition  by the  Trustee  shall  be  subject  to prior  compliance  with the
provisions of Section 5.07 of this Indenture and the Tax Regulatory Agreement.

     (D) Subject to paragraph (C) of this Section 3.03,  upon the receipt of the
Certificate  of  the  Borrower   required  by  Section  3.3  of  the  Agreement,
accompanied by the written  approval of the Bank, or at such time that there are
no Outstanding  Bonds,  the Trustee shall transfer any remaining  balance in the
Project  Fund,  less the amount of any such  retention,  to a  separate  account
within the  Redemption  Account,  which the Trustee shall  establish and hold in
trust,  and which shall be entitled  the  "Surplus  Account."  The moneys in the
Surplus Account shall be used and applied (unless some other application of such
moneys  would  not,  in the  opinion  of  Bond  Counsel,  adversely  affect  the
Tax-exempt  status of interest on the Bonds) to pay principal only in connection
with the call and  redemption  of Bonds to the  maximum  degree  permissible  in
accordance with Section 4.01 hereof, and at the earliest possible dates at which
Bonds can be redeemed  without payment of premium  pursuant to this Indenture or
to reimburse  the Bank for any draws  theretofore  made by the Trustee under the
Letter of Credit,  but not yet  reimbursed,  the  proceeds of which were used to
accomplish such  redemption;  provided,  however,  that the principal of Pledged
Bonds shall be paid from moneys in the Surplus  Account  prior to the payment of
principal of any other outstanding  Bonds. Any moneys in the Surplus Account not
used to call and redeem Bonds or to reimburse the Bank as herein  provided shall
be used and applied to pay the principal of the Bonds as such principal  becomes
due and  payable,  in annual  amounts  which  bear the same  ratio to the annual
principal  due on the Bonds that the amount  deposited  in the  Surplus  Account
bears to the  original  face amount of the Bonds  (unless in the opinion of Bond
Counsel another use would not adversely affect the Tax-exempt status of interest
on the Bonds).  Notwithstanding  Section 5.05, the moneys in the Surplus Account
shall be invested at a yield no higher than the yield on the  Outstanding  Bonds
(unless in the opinion of Bond  Counsel  investment  at a higher yield would not
adversely affect the Tax-exempt  status of interest on the Bonds),  and all such
investment  income  shall be  deposited  in the Surplus  Account and expended or
reinvested as provided above.

     (E) The Trustee shall establish, maintain and hold in trust a separate fund
designated as the "Costs of Issuance  Fund." The moneys in the Costs of Issuance
Fund shall be held by the  Trustee in trust and  applied to the payment of Costs
of  Issuance,  upon a  requisition  or  letter  filed  with  the  Trustee  by an
Authorized  Representative  of  the  Borrower  or a  designee  of an  Authorized
Representative  of the  Borrower.  Any money  remaining in the Costs of Issuance
Fund on February  1, 1998 shall be either  transferred  to the  Project  Fund or
returned to the Borrower, at the direction of the Borrower.



                                       24

<PAGE>



     SECTION  3.04.  Validity of Bonds.  The validity of the  authorization  and
issuance of the Bonds is not  dependent  on and shall not be affected in any way
by any  proceedings  taken by the Authority or the Trustee with respect to or in
connection with the Agreement.  The recital contained in the Bonds that the same
are issued pursuant to the Act and the  Constitution and laws of the State shall
be conclusive  evidence of their validity and of compliance  with the provisions
of law in their issuance.


                                   ARTICLE IV

                        REDEMPTION AND PURCHASE OF BONDS

     SECTION 4.01.  Terms of Redemption.  The Bonds are subject to redemption by
the  Authority  if and to the extent the Borrower is entitled to make and makes,
or is required to make, a payment or prepayment  pursuant to Articles IV or VIII
of the Agreement. All such prepayments by the Borrower shall be deposited in the
Redemption  Account.  The  Authority  shall  not call  the  Bonds  for  optional
redemption, and the Trustee shall not give notice of any such redemption, unless
the Borrower has so directed in  accordance  with the  Agreement and has made or
caused to be made all required installments of the Borrower's  obligations under
the  Agreement;  provided  that the  Authority  may require such  payment  under
Section 8.3 of the Agreement without the Borrower's direction.

     The  Bonds  shall  be  subject  to  redemption  by the  Authority  upon the
following  terms  in  increments  of  $5,000,  provided  that  in the  event  of
redemption of less than all of the Bonds,  the amount which remains  Outstanding
shall be in Authorized Denominations:

     (1) Sinking  Fund  Redemption.  The Bonds are not  subject to sinking  fund
redemption.

     (2) Prior to the Fixed Rate Date.  On or prior to the Fixed Rate Date,  the
Bonds are subject to optional  redemption on any Interest Payment Date, in whole
or in part, to the extent of prepayments of amounts due under the Agreement made
at the option of the Borrower  pursuant to Section  8.2(b) of the Agreement with
the written approval of the Bank, at a redemption price of 100% of the principal
amount  of the  Bonds to be  redeemed,  plus  interest  accrued  thereon  to the
redemption date.

     (3) Taxability. In the event of a prepayment pursuant to Section 8.3(a)(ii)
or  Section  8.3(a)(iii)  of the  Agreement  as a result of a  Determination  of
Taxability,   Bonds   Outstanding   on  the  date  of  the  occurrence  of  such
Determination  of  Taxability  shall be  redeemed in whole at any time within 60
days after  such  occurrence,  at a  redemption  price of 100% of the  principal
amount  thereof  plus  interest  accrued  thereon  to the  redemption  date.  No
redemption  of Bonds shall be made  pursuant to any of the other  provisions  of
this Section 4.01 following a Determination  of Taxability.  IF THE LIEN OF THIS
INDENTURE  IS  DISCHARGED   PRIOR  TO  THE  OCCURRENCE  OF  A  DETERMINATION  OF
TAXABILITY, THEN THE BONDS SHALL NOT BE REDEEMED AS DESCRIBED IN THIS SUBSECTION
4.01(3).

     (4) Letter of Credit. The Bonds shall be redeemed in whole, at a redemption
price equal to 100% of the  principal  amount  thereof,  plus  interest  accrued
thereon to the redemption  date, on a redemption date not less than fifteen (15)
days  preceding  the  Expiration  Date of the Letter of Credit  selected  by the
Trustee if no  Alternate  Letter of Credit has been  delivered to the Trustee in
accordance with Section 5.8 of the Agreement.



                                       25

<PAGE>



     (5)  Extraordinary  Events.  To the extent of a prepayment  by the Borrower
pursuant to Sections 8.2(a), 8.3(a)(i) or 8.3(b) of the Agreement, the Bonds are
subject to redemption  prior to their stated  maturity as a whole or in part, on
any date, at a redemption  price equal to 100% of the principal  amount thereof,
plus interest accrued thereon to the redemption date.

     (6)  Optional  Redemption  After the Fixed Rate Date.  After the Fixed Rate
Date,  the Bonds are  subject  to  redemption  to the extent of  prepayments  of
amounts due under the Agreement  made at the option of the Borrower  pursuant to
Section  8.2(b) of the  Agreement,  with the consent of the Bank, in whole or in
part,  on any Interest  Payment  Date during the  applicable  periods  specified
below, at the applicable  redemption  price stated below,  plus interest accrued
thereon to the redemption date:

Number of Years
From Fixed Rate Date          First Optional            Redemption
to Final Maturity             Redemption Date           Price

greater than 9 years          7 years from              102%,
                              conversion                declining
                                                        1% annually
                                                        to 100%

6-9 years                     6 years from              101%,
                              conversion                declining
                                                        1% annually
                                                        to 100%

less than 6 years             no optional
                              redemption

Notwithstanding the optional redemption schedule set forth above, on or prior to
the Fixed Rate Date,  the  Remarketing  Agent may provide an alternate  optional
redemption schedule if it obtains an opinion of Bond Counsel that such alternate
schedule will not cause interest on the Bonds not to be Tax-exempt.

     (7) Mandatory  Redemption for Reimbursement  Agreement  Default.  The Bonds
shall be redeemed in whole, at a redemption price equal to 100% of the principal
amount thereof,  plus interest  accrued thereon to the redemption  date,  within
five (5) calendar days (and before the following  Saturday if the fifth calendar
day is a Saturday)  from the date the Trustee  receives  written notice from the
Bank that an event of default has taken place under the Reimbursement  Agreement
and directing the Trustee to redeem the Bonds.

     (8)  Mandatory  Redemption  from  Excess  Funds.  The Bonds are  subject to
redemption in part on any Interest  Payment Date at a redemption  price equal to
100% of the principal  amount thereof,  plus accrued  interest to the redemption
date,  on the next  succeeding  Interest  Payment  Date to the extent of amounts
remaining in the Project Fund upon completion of the Project which are deposited
in the Surplus  Account and  directed to be used to redeem  Bonds as provided in
Section 3.03(D).

     SECTION 4.02. Selection of Bonds for Redemption. Whenever provision is made
in this Indenture for the redemption of less than all of the Bonds,  the Trustee
shall select the Bonds to be


                                       26

<PAGE>



redeemed from all Bonds or such given portion thereof not previously  called for
redemption by lot in any manner which the Trustee in its sole  discretion  shall
deem  appropriate and fair, to be credited against the principal of the Bonds to
be redeemed;  provided,  however, that in connection with an optional redemption
of the Bonds,  Pledged Bonds shall be the first Bonds  selected for  redemption;
and provided  further,  that the Bonds  Outstanding  after giving  effect to any
redemption  shall be in Authorized  Denominations.  Upon  selection of Bonds for
redemption  on or prior to the Fixed Rate Date,  the  Trustee  will  immediately
notify the Tender Agent of the Bonds selected for redemption.

     SECTION 4.03.  Notice of  Redemption.  (A) The Trustee shall mail notice of
redemption  (1) prior to the Fixed Rate Date,  not less than fifteen days before
such  redemption  date,  (except in the case of redemptions  pursuant to Section
4.01(4)  in which  case not less than  five  days or in the case of  redemptions
pursuant  to Section  4.01(7),  in which case  notice  shall be given as soon as
practicable),  and (2) after the Fixed  Rate  Date,  not less than  thirty  days
before  such  redemption  date  (except in the case of  redemptions  pursuant to
Section  4.01(4),  in  which  case  not less  than  five  days or in the case of
redemptions  pursuant to Section 4.01(7), in which case notice shall be given as
soon as  practicable)  to the  respective  Holders of any Bonds  designated  for
redemption at their addresses on the  registration  books maintained by the Bond
Registrar.  Each notice of redemption shall state the redemption date, the place
or places of redemption,  if less than all of the Bonds are to be redeemed,  the
distinctive numbers of the Bonds to be redeemed,  and in the case of Bonds to be
redeemed in part only, the respective  portions of the principal  amount thereof
to be  redeemed.  Each such notice shall also state that on said date there will
become due and  payable on each of said Bonds the  principal  thereof or of said
specified  portion of the principal thereof in the case of a Bond to be redeemed
in part only,  and that from and after such  redemption  date  interest  thereon
shall cease to accrue, and shall require that such Bonds be then surrendered.

     (B) Notice of  redemption  of Bonds shall be given by the  Trustee,  at the
expense of the Authority, for and on behalf of the Authority.

     (C) In the case of redemption  pursuant to Section 4.01 in connection  with
refunding  obligations to be issued for such purpose,  notice of such redemption
may be cancelled if such refunding obligations are not issued on or prior to the
date fixed for such redemption.

     (D)  Receipt of such  notice  shall not be a  condition  precedent  to such
redemption  and failure so to mail any such notice to a Holder  shall not affect
the validity of the proceedings for the redemption of Bonds of any Holder.

     (E) The Trustee shall,  at the same time the notice in subsection (A) above
is mailed,  also send a copy of the  notice by  certified  mail or by  overnight
delivery to each Securities Depository and to an Information Service. Failure to
provide  notice  to the  Tender  Agent,  the  Remarketing  Agent,  a  Securities
Depository  or to an  Information  Service  shall not  affect  the  validity  of
proceedings for the redemption of Bonds.

     SECTION  4.04.  Partial  Redemption  of Bonds.  Upon  surrender of any Bond
redeemed in part only, the Authority  shall execute and the Bond Registrar shall
authenticate and deliver to the registered owner thereof,  at the expense of the
Authority,  a new Bond or Bonds of Authorized  Denominations  equal in aggregate
principal amount to the unredeemed portion of the Bond surrendered.

     SECTION 4.05.  Effect of Redemption.  Notice of redemption having been duly
given as aforesaid,  and Available Moneys for payment of the redemption price of
the Bonds,  together  with  interest  accrued to the date fixed for  redemption,
being held by the Trustee, the Bonds (or portions


                                       27

<PAGE>



thereof) so called for redemption shall become due and payable on the redemption
date designated in such notice,  interest on the Bonds (or portions  thereof) so
called for redemption  shall cease to accrue,  said Bonds (or portions  thereof)
shall cease to be entitled to any benefit or security under this Indenture,  and
the  Holders of said Bonds  shall  have no rights in respect  thereof  except to
receive payment of said principal,  premium, if any, and interest accrued to the
date fixed for redemption.

     All Bonds  redeemed  pursuant to the  provisions  of this Article  shall be
cancelled  upon  surrender  thereof by the Trustee and  delivered to or upon the
order of the Authority.

     SECTION 4.06.  Purchase of Bonds by Tender  Agent.  Prior to the Fixed Rate
Date,  the Bonds may be delivered by the Holders  thereof to the Tender Agent at
its principal corporate trust office in San Francisco, California, or such other
place  as the  Tender  Agent  may  designate  in  writing  to  Bondholders,  the
Authority,  the Trustee,  the Bank, the Borrower and the Remarketing  Agent. Any
Bond so delivered shall be purchased by the Tender Agent on demand of the Holder
thereof  on the  close of any  Business  Day at a  purchase  price  equal to the
principal  amount thereof plus accrued interest to but not including the date of
purchase  (unless  such date is an  Interest  Payment  Date,  in which  case the
purchase  price will be the  principal  amount of such Bond);  provided that the
Tender Agent will be under no  obligation  to use its own funds to purchase such
Bonds and  provided  further  that  sufficient  funds in the  Purchase  Fund are
immediately available for purchase of the Bonds and upon:

     (A) delivery to the Tender Agent of an  irrevocable  written notice by 4:00
p.m.,  California  time,  (if not received by 4:00 p.m.,  California  time, on a
Business Day it shall be deemed  received on the next  succeeding  Business Day)
which  states (A) the name and address of the Holder,  (B) the number or numbers
of the Bond or Bonds to be purchased,  (C) the aggregate principal amount of the
Bond or Bonds to be  purchased,  and (D) the date on which  the Bond is or Bonds
are to be purchased, which date shall be a Business Day not prior to the seventh
(7th) calendar day next succeeding the date of delivery of such notice; and

     (B)  delivery  to the Tender  Agent at or prior to 10:00  a.m.,  California
time, on the Purchase Date  specified in the  aforesaid  notice,  of the Bond or
Bonds to be tendered; provided, however, that any Bond for which a notice of the
exercise of the  purchase  option has been given as provided in  subsection  (A)
above and which is not so  delivered  shall be deemed  delivered  on the date of
purchase and shall be purchased in accordance with the Indenture.

     All Bonds,  or portions  thereof,  purchased  pursuant to this Section 4.06
shall be purchased in an amount equal to an Authorized Denomination. The Trustee
shall upon request of the Tender Agent calculate the purchase price of any Bonds
purchased  pursuant to this  Section  4.06 and shall  notify the Tender Agent of
such amount prior to the Purchase Date.

     SECTION 4.07. Mandatory Tender of Bonds. On each Mandatory Tender Date, the
Bonds shall be subject to mandatory tender for purchase on such Mandatory Tender
Date at a purchase  price equal to the principal  amount  thereof,  plus accrued
interest,  if any. The Holders of all of the Outstanding Bonds shall be required
to tender their Bonds for purchase by the Tender Agent on the  Mandatory  Tender
Date.  All Bonds which on the  Mandatory  Tender Date have not been tendered for
purchase  ("Non-Tendered  Bonds"), shall be deemed purchased by the Tender Agent
on the  Mandatory  Tender Date at a price of the principal  amount  thereof plus
unpaid  interest  accrued,  if any,  to such  date.  Replacement  Bonds  for the
Non-Tendered  Bonds may be remarketed and delivered to new Holders as instructed
by the Borrower or the Remarketing  Agent.  The Tender Agent shall hold in trust
for the Holders of the Non-Tendered Bonds the purchase price thereof,  and after
the Mandatory Tender Date such owners will


                                       28

<PAGE>



no longer be entitled to any of the  benefits of this  Indenture  except for the
payment of such purchase price.


                                    ARTICLE V

                          REVENUES; FUNDS AND ACCOUNTS;
                        PAYMENT OF PRINCIPAL AND INTEREST

     SECTION 5.01. Pledge and Assignment;  Revenue Fund. (A) Subject only to the
provisions of this Indenture permitting the application thereof for the purposes
and on the terms and  conditions  set forth herein,  all of the Revenues and any
other  amounts  (including  proceeds  of the sale of Bonds)  held in any fund or
account established pursuant to this Indenture (except to the extent provided in
Sections  5.05,  7.03 and 8.06 and  excepting the Rebate Fund created by Section
5.07) are hereby pledged by the Authority to secure the payment of the principal
and purchase  price of and interest on the Bonds in accordance  with their terms
and the  provisions of this  Indenture and  thereafter,  on a basis  subordinate
thereto,   to  secure  the   Borrower's   obligations  to  the  Bank  under  the
Reimbursement  Agreement.  Said pledge  shall  constitute a lien on and security
interest in such assets and shall attach,  be perfected and be valid and binding
from and after  delivery  by the  Trustee of the  Bonds,  without  any  physical
delivery thereof or further act.

     (B) The Authority  hereby  transfers in trust,  and assigns to the Trustee,
for the benefit of the Holders of the Bonds,  and the Bank, to the extent of its
interest therein, all of the Revenues and other assets pledged in subsection (A)
of this Section and all of the right, title and interest of the Authority in the
Agreement (except for the right to receive any Additional Payments to the extent
payable to the  Authority,  any rights of the Authority to  indemnification  and
rights of inspection  and  consent).  The Trustee shall be entitled to and shall
collect and receive all of the Revenues,  and any Revenues collected or received
by the  Authority  shall be deemed to be held,  and to have  been  collected  or
received,  by the  Authority as the agent of the Trustee and shall  forthwith be
paid by the Authority to the Trustee.  The Trustee also shall be entitled to and
shall  take all steps,  actions  and  proceedings  reasonably  necessary  in its
judgment to enforce, either jointly with the Authority or separately, all of the
rights of the Authority  and all of the  obligations  of the Borrower  under the
Agreement.

     The Trustee  agrees that,  so long as the Trustee holds any Revenues or any
other  amounts  (including  proceeds  of the sale of the  Bonds)  in any fund or
account  established  pursuant  to  this  Indenture  which  are  pledged  by the
Authority or the Borrower to secure the payment of the principal of and interest
on  the  Bonds  and  the   Borrower's   reimbursement   obligations   under  the
Reimbursement Agreement, the Trustee shall hold the same as the collateral agent
and bailee of the Bank but only to the extent of amounts  paid by the Bank under
the Letter of Credit for which the Bank has not received  reimbursement from the
Borrower for purposes of perfecting  the lien and security  interest of the Bank
therein.  Upon  receipt of written  notice from the Bank that the  Borrower  has
failed to  reimburse  the Bank for a draw under the Letter of Credit as required
by the Reimbursement  Agreement, the Trustee shall either cause all accounts and
investments which are the subject of the preceding sentence to be titled in such
a manner to reflect  that the Bank has an interest  therein as  described in the
preceding  sentence or ensure  that each Person with whom the Trustee  places or
through  whom the  Trustee  invests  any  moneys  which are the  subject  of the
preceding sentence is advised of the Bank's interest therein as described in the
preceding  sentence and instructed to mark its records to reflect such interest.
The  Trustee  shall not  pledge,  hypothecate,  transfer  or release  all or any
portion of the  Revenues  to any persons  (including,  without  limitation,  the
Borrower) other than Holders of the Bonds in payment thereof or in any manner


                                       29

<PAGE>



not in accordance with this Indenture or the Reimbursement Agreement without the
written consent of the Authority and the Bank, except as otherwise required by a
court of law.

     (C) All  Revenues  shall be promptly  deposited by the Trustee upon receipt
thereof in a special fund designated as the Revenue Fund which the Trustee shall
establish,  maintain and hold in trust;  except as otherwise provided in Section
5.02,  all moneys  received by the Trustee and  required to be  deposited in the
Project  Fund shall be promptly  deposited  in the  Project  Fund and all moneys
received by the Trustee and required to be deposited in the  Redemption  Account
shall be promptly deposited in the Redemption  Account,  which the Trustee shall
establish,  maintain and hold in trust. All Revenues  deposited with the Trustee
shall be held, disbursed,  allocated and applied by the Trustee only as provided
in this  Indenture.  All moneys held by the Tender  Agent for the payment of the
principal  or purchase  price of,  premium,  if any,  and interest on the Bonds,
shall be held by the Tender Agent in trust for the payment of such Bonds.

     SECTION  5.02.  Allocation  of Revenues.  Loan  Repayments  received by the
Trustee from the Borrower  pursuant to Section 4.2(a) of the Agreement  shall be
deposited by the Trustee into the following  respective  accounts (each of which
the Trustee  shall  establish  and  maintain  within the Revenue  Fund),  in the
following amounts,  in the following order of priority,  and the requirements of
each such  account  (including  the  making up of any  deficiencies  in any such
account resulting from lack of Revenues  sufficient to make any earlier required
deposit) at the time of deposit  shall be satisfied  before any transfer is made
to any account subsequent in priority, and provided, that no moneys representing
drawings  under the  Letter of Credit  shall be  transferred  into the  Interest
Account, the Principal Account or the Redemption Account of the Revenue Fund:

     First:  to the  Interest  Account,  the  amount  paid by the  Borrower  and
designated as or  attributable  to interest on the Bonds in the most recent Loan
Repayment,  so that the  aggregate of such amounts  will,  on the next  Interest
Payment  Date,  equal the amount of interest  due on the Bonds on such  Interest
Payment Date.

     Second:  to the  Principal  Account,  the amount paid by the  Borrower  and
designated as or  attributable to principal of the Bonds in the most recent Loan
Repayment,  so that the aggregate of such amounts  will, on the next  succeeding
principal  payment date,  equal the amount of principal due (whether at maturity
or by acceleration) on such principal payment date.

     Third:  to the Redemption  Account,  the aggregate  amount of principal and
premium, if any, next coming due by redemption permitted (as directed in writing
by the  Borrower) or required  under Article IV hereof,  or any portion  thereof
paid by the Borrower.

     SECTION 5.03. Priority of Moneys in Revenue Fund; Letter of Credit Account.
(A) Funds for the payment of the principal or  redemption  price of and interest
on the  Bonds  shall be  derived  from the  following  sources  in the  order of
priority  indicated  in each  of the  accounts  in the  Revenue  Fund;  provided
however,  that amounts in the respective  accounts within the Revenue Fund shall
be used to pay the  principal or  redemption  price of and interest on the Bonds
held by Holders other than the Bank or the Borrower  prior to the payment of the
principal  and  interest  on the  Bonds  held by the Bank or the  Borrower,  and
provided further, that if principal or redemption price (or any portion thereof)
of and interest on the Bonds is paid with moneys  described in subparagraph  (i)
of this Section 5.03(A),  any other moneys on deposit in the respective accounts
in the Revenue Fund shall be applied to  immediately  reimburse the Bank by wire
transfer in the amount of any such drawings:



                                       30

<PAGE>



          (i) moneys paid into the Letter of Credit  Account of the Revenue Fund
representing the proceeds of drawings by the Trustee under the Letter of Credit;

          (ii)  moneys  paid into the  Interest  Account,  if any,  representing
accrued interest received at the initial sale of the Bonds and proceeds from the
investment  thereof  which  shall be applied to the  payment of  interest on the
Bonds;

          (iii) moneys paid into the Revenue Fund  pursuant to Section  10.01(B)
and proceeds from the investment thereof, which constitute Available Moneys;

          (iv) moneys deposited into the Redemption  Account pursuant to Section
3.03(D) and proceeds from the investment thereof;

          (v) any other moneys (not derived  from  drawings  under the Letter of
Credit)  paid into the Revenue Fund and proceeds  from the  investment  thereof,
which constitute Available Moneys; and

          (vi) any other moneys paid into the Revenue Fund and proceeds from the
investment thereof, which are not Available Moneys.

     The Trustee shall create within the Revenue Fund a separate  account called
the "Letter of Credit  Account," and all moneys drawn under the Letter of Credit
shall be deposited and disbursed  either in the Letter of Credit  Account or the
Liquidity  Account  established  pursuant to Section 8.10. None of the Borrower,
any Related Party, the Trustee or the Authority shall have any legal,  equitable
or beneficial  right,  title or interest in the Letter of Credit  Account or the
Liquidity Account.  The Letter of Credit Account and the Liquidity Account shall
be established and maintained by the Trustee and the Tender Agent, respectively,
and held in trust  apart from all other  moneys and  securities  held under this
Indenture  or  otherwise,  and over  which the  Trustee  and the  Tender  Agent,
respectively,  shall have the  exclusive  and sole right of  withdrawal  for the
exclusive benefit of the Holders of the Bonds with respect to which each drawing
is made.

     (B) The Trustee  shall draw moneys under the Letter of Credit in accordance
with the terms thereof in amounts  necessary to make full and timely payments of
principal of, premium, if any, and interest on the Bonds, other than Bonds owned
by or for the account of the Borrower or the Bank when due, whether at maturity,
redemption,  acceleration,  an Interest Payment Date or otherwise.  In addition,
the Trustee shall draw moneys under the Letter of Credit in accordance  with the
terms thereof to the extent necessary to make full and timely payments  required
to be made pursuant to, and in accordance  with,  Article VIII hereof to pay the
purchase price of tendered  Bonds.  The Trustee shall notify the Borrower of any
proposed  drawing on the Letter of Credit  (other than with respect to scheduled
payments of principal and interest), as and when it notifies the Bank.

     (C) If on the Fixed  Rate Date  there  shall  have  been  delivered  to the
Trustee an Alternate Credit Facility pursuant to Section 5.7 of the Agreement or
if at any time  there  shall have been  delivered  to the  Trustee an  Alternate
Letter of Credit  pursuant  to Section  5.8 of the  Agreement,  then the Trustee
shall accept such Alternate  Credit Facility or Alternate  Letter of Credit,  as
applicable,  and promptly  surrender the previously held Letter of Credit to the
issuing Bank for cancellation,  and shall promptly take all actions requested by
the  issuing  Bank to  convey to such Bank or  otherwise  relinquish  all of its
right,  title and interest in any security  held jointly by the issuing Bank and
the  Trustee.  If at any time  there  shall  cease to be any  Bonds  Outstanding
hereunder, the Trustee shall promptly surrender


                                       31

<PAGE>



the Letter of Credit to the Bank for cancellation. The Trustee shall comply with
the  procedures  set forth in the  Letter of Credit  relating  to the  surrender
thereof.

     SECTION  5.04.  Letter of  Credit.  Subject  to the  provisions  of Section
5.03(C),  the  Trustee  shall  hold and  maintain  the  Letter of Credit for the
benefit of the Bondholders until the Letter of Credit expires in accordance with
its terms.  The  Trustee  shall  diligently  observe  all terms,  covenants  and
conditions of the Letter of Credit,  including  payment when due of any draws on
the Letter of Credit,  and the  provisions  relating to the payment of draws on,
and reinstatement of amounts that may be drawn under, the Letter of Credit,  and
will not consent to,  agree to or permit any  amendment or  modification  of the
Letter of Credit  which  would  adversely  affect the rights or  security of the
Holders  of the Bonds.  If at any time  during the term of the Letter of Credit,
any successor Trustee shall be appointed and qualified under this Indenture, the
resigning or removed  Trustee shall request that the Bank transfer the Letter of
Credit to the successor  Trustee in accordance  with the procedures for transfer
specified in the Letter of Credit.  If the resigning or removed Trustee fails to
make  this  request,   the  successor  Trustee  shall  do  so  before  accepting
appointment.  The Trustee  shall send notice to the Bank and the Borrower of the
expiration of the Letter of Credit at least two months prior to the date of such
expiration.

     At least thirty (30) days prior to the Letter of Credit  Substitution Date,
the  Trustee  shall send a written  notice to the  Bondholders  relating  to the
Borrower's  election  pursuant  to Section  5.8 of the  Agreement  to deliver an
Alternate  Letter of Credit to the  Trustee.  Such notice  shall (i) specify the
proposed Letter of Credit  Substitution Date, (ii) require the Holders of all of
the Outstanding Bonds to tender their Bonds for purchase on the Mandatory Tender
Date pursuant to Section 4.07,  and (iii) state that all  Outstanding  Bonds not
purchased on or before the Mandatory  Tender Date will be deemed to be purchased
on the Mandatory  Tender Date at a price equal to the principal  amount thereof,
plus unpaid interest, if any, accrued to such date.

     SECTION 5.05. Investment of Moneys.  Subject to the following sentence, all
moneys in any of the funds or accounts  established  pursuant to this  Indenture
shall be  invested  by the  Trustee as  directed  in  writing  by an  Authorized
Representative of the Borrower, in Permitted Investments maturing not later than
the date on which it is  estimated  that such moneys  will be  required  for the
purposes  specified in this Indenture;  provided,  however,  that: (i) moneys on
deposit in the Letter of Credit  Account  and the  Purchase  Fund and any moneys
held pursuant to Section 4.07 shall be held uninvested;  (ii) any moneys held in
trust for the  payment or  redemption  of Bonds  pursuant  to Article X shall be
invested  as  provided in Section  10.03;  (iii)  moneys held in the Rebate Fund
shall be invested in direct  obligations  of the United States or bonds or other
obligations  guaranteed  by the United  States  government or for which the full
faith and credit of the United  States is pledged for the  payment of  principal
and  interest  thereof,  or in money  market  funds the  investment  of which is
limited to such  obligations,  in each case rated in the highest rating category
applicable to such investments  which mature not later than the date on which it
is  estimated  that such moneys will be required;  and (iv) moneys  described in
clause (ii),  (iii),  or (iv) of Section  5.03(A) shall be invested in Permitted
Investments  rated A-l or Prime 1 or higher by S&P and Moody's  which mature not
later than the date on which such  moneys  will be  required to pay the Bonds or
the interest  thereon.  Immediately upon the giving by the Trustee of the notice
provided for in paragraph (C) of Section 3.03 of this  Indenture,  all moneys in
any of the funds or accounts established pursuant to this Indenture,  subject to
the limitations set forth in (i) through (iv) of the first sentence above, shall
be invested by the Trustee in Permitted  Investments maturing not later than the
date on which it is estimated that such moneys will be required for the purposes
specified in this Indenture.

     Permitted Investments may be purchased at such prices as the Trustee may in
its discretion determine or as may be directed by the Borrower or its agent. All
Permitted  Investments  shall be acquired as directed by the Borrower subject to
the limitations set forth in Section 6.06, the limitations


                                       32

<PAGE>



as to maturities in this Section set forth,  and such additional  limitations or
requirements  consistent  with the foregoing as may be established by Request of
the Borrower.  Notwithstanding  any other  provision  herein,  in the absence of
written investment  instructions from the Borrower directing the Trustee by noon
of the Business  Day  preceding  the day when  investments  are to be made,  the
Trustee is directed to invest  available  funds not  described  in clauses  (i),
(ii), or (iii) of the first paragraph of this Section in Investment  Securities.
The  Trustee  shall  not be  liable  for any  consequences  resulting  from  any
investments  made  pursuant  to  the  preceding  sentence  except  for  its  own
negligence or wilful misconduct.

     All  interest,  profits and other income  received  from the  investment of
moneys in any fund established pursuant to this Indenture, (1) prior to delivery
to the Trustee of the  Certificate of the Borrower with respect to completion of
the Project (as provided in Section 3.03(D)) shall be deposited when received in
the  Project  Fund,  and (2) after the  delivery  of such  Certificate  shall be
deposited in the Revenue Fund; except that any such interest,  profits and other
income  received  from the  investment  of: (i) any moneys held in trust for the
payment  or  redemption  of Bonds  pursuant  to  Article X shall be  applied  as
provided  in  Article X; and (ii) any  moneys  held in the Rebate  Fund shall be
deposited in such fund.  Notwithstanding  anything to the contrary  contained in
this  paragraph,  an amount of interest  received  with respect to any Permitted
Investment equal to the amount of accrued interest,  if any, paid as part of the
purchase price of such Permitted  Investment  shall be credited to the fund from
which such accrued interest was paid.

     For the  purpose  of  determining  the  amount in any fund,  all  Permitted
Investments  credited  to such fund shall be valued at the market  value of such
Permitted Investments.

     The Trustee may act as principal or agent in the making or disposing of any
investment.  The Trustee may sell at the best price  obtainable in the Trustee's
sole  discretion,  or  present  for  redemption,  any  Permitted  Investment  so
purchased  whenever it shall be necessary to provide moneys to meet any required
payment,  transfer,  withdrawal  or  disbursement  from the  fund to which  such
Permitted  Investment  is  credited,  and the  Trustee  shall  not be  liable or
responsible  for any loss  resulting  from such  investment  except  for its own
negligence or wilful misconduct.  For investment  purposes only, the Trustee may
commingle  moneys  held in the  Interest  Account and  Principal  Account of the
Revenue Fund.

     SECTION 5.06.  Additional Duties of Trustee.  While the Bonds bear interest
at the Weekly  Interest  Rate,  on or prior to the Business Day  preceding  each
Interest Payment Date, the Trustee shall send to the Borrower an invoice for the
interest  accrued on the Bonds for the current  Interest  Period  which is to be
paid pursuant to Section 4.2 of the Agreement.  While the Bonds bear interest at
the Fixed Interest Rate,  thirty (30) days prior to each Interest  Payment Date,
the Trustee  shall send to the  Borrower an invoice for the  interest due on the
Bonds on the next succeeding  Interest Payment Date which is to be paid pursuant
to  Section  4.2 of the  Agreement.  The  Trustee  shall send a copy of any such
invoice sent to the Borrower to the Bank. If full payment of any such invoice is
not received by the date the Borrower is required to make such payment  pursuant
to Section 4.2 of the Agreement, the Trustee shall immediately notify in writing
the Bank, the Borrower and the Authority of such  nonpayment or  underpayment by
the Borrower.  The Trustee shall  immediately  give the Bank written notice upon
the failure of the Borrower to make any  principal  payment  pursuant to Section
4.2 of the Agreement.

     SECTION 5.07. Establishment of Rebate Fund. (A) The Trustee shall establish
and maintain a fund  separate  from any other fund  established  and  maintained
hereunder  designated  as the "Rebate  Fund."  There shall be  deposited  in the
Rebate Fund such amounts as are required to be deposited therein pursuant to the
written  instructions  of the Borrower.  All money at any time  deposited in the
Rebate  Fund shall be held by the  Trustee in trust,  to the extent  required to
satisfy the Rebate


                                       33

<PAGE>



Requirement  (as defined in the Tax  Regulatory  Agreement),  for payment to the
federal  government of the United  States of America and neither the  Authority,
the  Bondholders,  the  Trustee,  the Tender  Agent,  or the Bank shall have any
rights in or claim to such moneys.  All amounts  deposited into or on deposit in
the Rebate Fund shall be governed by this Section 5.07 and Sections 3.4 and 5.11
of the  Agreement and by the Tax  Regulatory  Agreement  (which is  incorporated
herein by reference).  The Trustee shall be deemed conclusively to have complied
with said  Sections if it follows the written  direction  of the  Borrower,  and
shall have no liability or responsibility to enforce  compliance by the Borrower
with the terms of the Tax Regulatory Agreement or said Sections.

     (B) Upon  receipt  of the  instructions  required  to be  delivered  to the
Trustee pursuant to the Tax Regulatory  Agreement,  the Trustee shall remit part
or all of the balance in the Rebate Fund to the United States government,  as so
directed. In addition, if the instructions  delivered to the Trustee pursuant to
the Tax Regulatory Agreement so direct, the Trustee shall deposit moneys into or
transfer  moneys  out of the  Rebate  Fund from or into such  accounts  or funds
excluding the Purchase Fund and the Letter of Credit Account,  Available  Moneys
and moneys being aged to become Available Moneys, as the instructions direct.

     (C) Notwithstanding any provision of this Section 5.07, if the Authority or
the  Borrower  shall  provide to the Trustee an opinion of Bond Counsel that any
specified  action required under this Section is no longer required or that some
further or  different  action is required to maintain the  exclusion  from gross
income for federal  income tax  purposes of interest  with respect to the Bonds,
the Trustee and the Authority may conclusively rely on such opinion in complying
with the  requirements  of this Section,  and the covenants  hereunder  shall be
deemed to be modified to that extent.

                                   ARTICLE VI

                              PARTICULAR COVENANTS

     SECTION 6.01. Punctual Payment. The Authority shall punctually pay or cause
to be paid the principal, premium, if any, and interest to become due in respect
of all the Bonds,  in strict  conformity with the terms of the Bonds and of this
Indenture,  according  to the true intent and meaning  thereof,  but only out of
Revenues  and  other  assets  pledged  for  such  payment  as  provided  in this
Indenture.

     SECTION  6.02.  Extension  of Payment  of Bonds.  The  Authority  shall not
directly or indirectly  extend or assent to the extension of the maturity of any
of the Bonds or the time of payment of any claims for  interest by the  purchase
or funding of such Bonds or claims for interest or by any other  arrangement and
in case the  maturity  of any of the  Bonds or the time of  payment  of any such
claims for interest  shall be extended,  such Bonds or claims for interest shall
not be  entitled,  in case of any  default  hereunder,  to the  benefits of this
Indenture,  except  subject to the prior payment in full of the principal of all
of the Bonds then outstanding and of all claims for interest thereon which shall
not have been so extended.  Nothing in this Section shall be deemed to limit the
right  of the  Authority  to  issue  bonds  for the  purpose  of  refunding  any
Outstanding  Bonds,  and such  issuance  shall not be deemed  to  constitute  an
extension of maturity of Bonds.

     SECTION 6.03.  Against  Encumbrances.  The Authority  shall not create,  or
permit the creation of, any pledge,  lien,  charge or other encumbrance upon the
Revenues and other assets pledged or assigned under this Indenture  while any of
the Bonds are  Outstanding,  except the pledge  and  assignment  created by this
Indenture.  Subject to this  limitation,  the Authority  expressly  reserves the
right


                                       34

<PAGE>



to enter into one or more other  indentures  for any of its corporate  purposes,
including  other  programs  under the Act, and reserves the right to issue other
obligations for such purposes.

     SECTION  6.04.  Power to Issue  Bonds and Make Pledge and  Assignment.  The
Authority  is duly  authorized  pursuant  to law to issue the Bonds and to enter
into this  Indenture  and to pledge  and assign the  Revenues  and other  assets
purported to be pledged and assigned,  respectively, under this Indenture in the
manner  and to the  extent  provided  in  this  Indenture.  The  Bonds  and  the
provisions  of this  Indenture  are and will be the  legal,  valid  and  binding
limited  obligations  of the Authority in accordance  with their terms,  and the
Authority shall at all times, to the extent permitted by law,  defend,  preserve
and protect said pledge and  assignment of Revenues and other assets and all the
rights of the Bondholders under this Indenture against all claims and demands of
all persons whomsoever.

     SECTION  6.05.  Accounting  Records and Reports.  The Trustee shall keep or
cause to be kept  proper  books of record  and  account  in which  complete  and
correct  entries  shall be made of all  transactions  relating  to the  receipt,
investment,  disbursement,  allocation  and  application of the Revenues and the
proceeds  of the Bonds  received by the  Trustee  with  respect to all funds and
accounts held hereunder. Such records shall specify the account or fund to which
each investment (or portion  thereof) held by the Trustee is to be allocated and
shall set  forth,  in the case of each  Investment  Security,  (a) its  purchase
price,  (b)  identifying  information,  including par amount,  coupon rate,  and
payment  dates,  (c) the amount  received at maturity or its sale price,  as the
case may be,  (d) the  amounts  and  dates of any  payments  made  with  respect
thereto, and (e) the dates of acquisition and disposition or maturity.

     Such records  shall be open to inspection by any Holder and the Bank at any
reasonable time during regular business hours on reasonable notice.

     SECTION  6.06.  Arbitrage  Covenants.  The  Authority  has in the Agreement
caused the Borrower to covenant that the Borrower  shall not make any use of the
proceeds  of the Bonds or of any moneys on deposit to the credit of the  Project
Fund,  the Revenue Fund or the Rebate Fund which may be deemed to be proceeds of
the  Bonds  pursuant  to  Section  148 of the Code and the  applicable  Treasury
Regulations  thereunder  which  would cause any Bond to be an  "arbitrage  bond"
within the meaning of said  Section and said  regulations  and that the Borrower
will comply with the requirements of said Section and said  regulations,  as the
same may be amended from time to time, so long as any Bonds remain Outstanding.

     SECTION 6.07. Other  Covenants.  (A) The Trustee shall promptly collect all
amounts due from the  Borrower  pursuant  to the  Agreement,  shall  perform all
duties imposed upon it pursuant to the Agreement and shall  diligently  enforce,
and take  all  steps,  actions  and  proceedings  reasonably  necessary  for the
enforcement of all of the rights of the Authority and all of the  obligations of
the Borrower.

     (B) The Authority shall not amend,  modify or terminate any of the terms of
the Agreement,  or consent to any such  amendment,  modification or termination,
without the written  consent of the Trustee and the Bank. The Trustee shall give
such written consent only if (1) in the opinion of the Trustee, in reliance upon
the advice of counsel,  such  amendment,  modification  or termination  will not
materially  adversely  affect the interests of the  Bondholders or result in any
material  impairment of the security  hereby given for the payment of the Bonds,
or (2) the  Authority  first  obtains  the  written  consent of the Holders of a
majority in principal  amount of the Bonds then  Outstanding to such  amendment,
modification  or termination,  provided that no such amendment,  modification or
termination  shall  reduce  the  amount  of  Loan  Repayments  to be made to the
Authority or the Trustee by the Borrower  pursuant to the  Agreement,  or extend
the time for making such payments, without the written consent


                                       35

<PAGE>



of all of the  Holders  of the Bonds  then  Outstanding.  The  Trustee  shall be
entitled  to rely upon an opinion of counsel  with  respect to the effect of any
amendments hereto or to the Agreement.

     SECTION 6.08.  Further  Assurances.  The Authority shall make,  execute and
deliver any and all such further  indentures,  instruments and assurances as may
be  reasonably  necessary or proper to carry out the  intention or to facilitate
the  performance  of this  Indenture and for the better  assuring and confirming
unto the  Holders  of the Bonds of the  rights  and  benefits  provided  in this
Indenture.

     SECTION  6.09.  Covenant  to Enter into  Agreement  or  Contract to Provide
Ongoing Disclosure. The Borrower has covenanted and agreed with the Authority in
Section  5.12  of  the  Agreement  to  enter  into  an  agreement  or  contract,
constituting an undertaking (the  "Undertaking"),  to provide ongoing disclosure
for the benefit of the  Bondholders  as required by  Paragraph  (b)(5)(i) of the
Securities and Exchange  Commission  Rule 15c2-12 under the Securities  Exchange
Act of 1934, as amended (17 CFR Part 240 Section  240.15c2-12)  (the "Disclosure
Requirements"),  to the extent the Bonds or the  remarketing  thereof are at any
time not exempt from the  Disclosure  Requirements.  The  Undertaking  is hereby
assigned by the Authority to the Trustee for the benefit of the Bondholders, any
Participating Underwriter and any Beneficial Owner. Such assignment is a present
absolute  assignment and not an assignment of a security interest.  Section 5.12
of  the  Agreement  shall  be  enforceable  by  any  Bondholder,   Participating
Underwriter or Beneficial Owner. However,  neither the Authority nor the Trustee
shall have any duty to enforce such Section 5.12.  The  Authority  shall have no
liability to the Bondholders,  Participating Underwriters,  Beneficial Owners or
any other  person with  respect to the actions by the  Borrower  relating to the
Disclosure Requirements.  Notwithstanding any other provision of this Indenture,
failure of the Borrower to comply with Section 5.12 of the  Agreement  shall not
be considered an Event of Default;  provided,  however, the Trustee may (and, at
the  request of any  Participating  Underwriter  or the  Holders of at least 25%
aggregate  principal amount in Outstanding Bonds, shall) or any Beneficial Owner
may take such action as may be  necessary  and  appropriate,  including  seeking
mandate or specific  performance by court order, to cause the Borrower to comply
with its obligations under Section 5.12 of the Agreement.

                                   ARTICLE VII

                  EVENTS OF DEFAULT AND REMEDIES OF BONDHOLDERS

     SECTION 7.01. Events of Default;  Acceleration;  Waiver of Default. Each of
the following events shall constitute an "Event of Default" hereunder:

     (A) default in the due and punctual payment of the principal of, or premium
(if any) on, any Bond when and as the same shall become due and payable, whether
at maturity as therein expressed, by proceedings for redemption,  by declaration
or otherwise;

     (B) default in the due and punctual  payment of any installment of interest
on any Bond, when and as such interest  installment shall become due and payable
and the  continuation  of such  failure  for a period of five days after the due
date for such payment;

     (C) failure to pay the purchase  price of any Bond  tendered in  accordance
with the provisions of Section 4.06, and the  continuation of such failure for a
period of five days after such purchase price has become due and payable;

     (D)  failure  by the  Authority  to  perform  or  observe  any of the other
covenants,  agreements  or  conditions  on its part in this  Indenture or in the
Bonds contained, and the


                                       36

<PAGE>



continuation  of such  failure  for a period of sixty  (60) days  after  written
notice  thereof,  specifying such default and requiring the same to be remedied,
shall  have  been  given to the  Authority,  the Bank  and the  Borrower  by the
Trustee,  or to the  Authority,  the Bank,  the  Borrower and the Trustee by the
Holders of not less than twenty-five percent (25%) in aggregate principal amount
of the Bonds at the time Outstanding; or

     (E) the  occurrence and  continuance  of a Loan Default Event  described in
Section 7.1(a), (b) or (c) of the Agreement.

     No default  specified  in (D) above  shall  constitute  an Event of Default
unless the Authority and the Borrower  shall have failed to correct such default
within the applicable period;  provided,  however,  that if the default shall be
such that it cannot be corrected within such period,  it shall not constitute an
Event of Default if  corrective  action is  instituted  by the  Authority or the
Borrower within the applicable period and diligently pursued. With regard to any
alleged  default  concerning  which  notice is given to the  Borrower  under the
provisions  of this  Section,  the  Authority  hereby  grants the Borrower  full
authority for account of the Authority to perform any covenant or obligation the
non-performance  of which is alleged in said notice to  constitute  a default in
the name and stead of the Authority with full power to do any and all things and
acts to the same extent that the Authority  could do and perform any such things
and acts and with power of substitution.

     During the continuance of an Event of Default,  unless the principal of all
the Bonds shall have already  become due and payable,  the Trustee may, and upon
the written request of the Holders of not less than twenty-five percent (25%) in
aggregate  principal  amount of the Bonds at the time  Outstanding,  or upon the
occurrence  of an Event of  Default  described  in (A),  (B) or (C)  above,  the
Trustee  shall,  by notice in writing to the  Authority,  the Tender Agent,  the
Remarketing  Agent, the Borrower and the Bank,  declare the principal of all the
Bonds then Outstanding,  and the interest accrued thereon, to be due and payable
immediately,  and upon any such  declaration  the same shall become and shall be
immediately  due  and  payable,  anything  in  this  Indenture  or in the  Bonds
contained to the contrary notwithstanding. Upon any such declaration the Trustee
shall  immediately  draw upon any then  existing  Letter of Credit in accordance
with the terms thereof and apply the amount so drawn to pay the principal of and
interest on the Bonds so declared to be due and  payable.  Interest on the Bonds
shall cease to accrue upon the  declaration of  acceleration.  The Trustee shall
notify the Bondholders of the date of acceleration  and the cessation of accrual
of interest on the Bonds in the same manner as for a notice of redemption.

     The preceding  paragraph,  however, is subject to the condition that if, at
any time after the  principal  of the Bonds shall have been so declared  due and
payable,  and before any  judgment  or decree for the  payment of the moneys due
shall have been  obtained  or entered as  hereinafter  provided,  and before the
Letter of Credit has been drawn upon in  accordance  with its terms and honored,
there shall have been deposited with the Trustee a sum sufficient to pay all the
principal  of the  Bonds  matured  prior  to such  declaration  and all  matured
installments  of  interest  (if any) upon all the Bonds,  with  interest on such
overdue  installments  of  principal  as  provided  in the  Agreement,  and  the
reasonable expenses of the Trustee,  and any and all other defaults known to the
Trustee (other than in the payment of principal of and interest on the Bonds due
and payable solely by reason of such  declaration)  shall have been made good or
cured to the  satisfaction of the Trustee or provision  deemed by the Trustee to
be adequate  shall have been made  therefor,  then,  and in every such case, the
Holders of at least a majority in aggregate  principal  amount of the Bonds then
Outstanding,  by written  notice to the  Authority  and to the Trustee,  may, on
behalf of the Holders of all the Bonds,  rescind and annul such  declaration and
its  consequences  and waive such default;  but no such rescission and annulment
shall  extend to or shall  affect any  subsequent  default,  or shall  impair or
exhaust any right or power as a consequence thereof.


                                       37

<PAGE>




     SECTION 7.02.  Institution of Legal Proceedings by Trustee.  If one or more
Events of Default shall happen and be continuing,  the Trustee in its discretion
may,  and upon the written  request of the  Holders of a majority  in  principal
amount  of  the  Bonds  then  Outstanding  and  upon  being  indemnified  to its
satisfaction  therefor  shall,  proceed to protect or enforce  its rights or the
rights of the  holders  of Bonds  under the Act or under this  Indenture  or the
Agreement  by a suit in  equity  or  action  at  law,  either  for the  specific
performance of any covenant or agreement  contained herein or therein, or in aid
of the execution of any power herein or therein granted, or by mandamus or other
appropriate  proceeding  for the  enforcement  of any other  legal or  equitable
remedy as the Trustee shall deem most  effectual in support of any of its rights
or duties hereunder.

     SECTION 7.03.  Application of Revenues and Other Funds After Default. If an
Event of Default shall occur and be continuing, all Revenues and any other funds
then held or thereafter  received by the Trustee under any of the  provisions of
this Indenture  (subject to Sections  5.05,  5.07 and 11.11) shall be applied by
the Trustee as follows and in the following order:

          (1) To the  payment of any  expenses  necessary  in the opinion of the
Trustee to protect  the  interests  of the  Holders of the Bonds and  payment of
reasonable  fees and  expenses of the  Trustee  (including  reasonable  fees and
disbursements  of its  counsel)  incurred  in and about the  performance  of its
powers and duties under this Indenture;  provided,  however,  that moneys in the
Letter of Credit  Account of the Revenue Fund and the Purchase Fund shall not be
used for the payment of any such expenses;

          (2) To the payment of the  principal of and  interest  then due on the
Bonds (upon  presentation  of the Bonds to be paid, and stamping  thereon of the
payment if only partially  paid, or surrender  thereof if fully paid) subject to
the provisions of this Indenture (including Section 6.02), as follows:

               (i) Unless the principal of all of the Bonds shall have become or
have been declared due and payable,

                    First: To the payment to the persons entitled thereto of all
     installments  of  interest  then due in the order of the  maturity  of such
     installments,  and, if the amount  available shall not be sufficient to pay
     in full any installment or installments  maturing on the same date, then to
     the payment thereof ratably,  according to the amounts due thereon,  to the
     persons entitled thereto, without any discrimination or preference; and

                    Second:  To the payment to the persons  entitled  thereto of
     the unpaid  principal of any Bonds which shall have become due,  whether at
     maturity or by call for redemption,  with interest on the overdue principal
     at the rate borne by the  respective  Bonds,  and, if the amount  available
     shall not be  sufficient  to pay in full all the Bonds,  together with such
     interest, then to the payment thereof ratably,  according to the amounts of
     principal  due on such date to the persons  entitled  thereto,  without any
     discrimination or preference.

               (ii) If the  principal  of all of the Bonds  shall have become or
have been declared due and payable, to the payment of the principal and interest
then due and unpaid upon the Bonds,  with  interest on the overdue  principal at
the  rate  borne  by the  Bonds,  and,  if the  amount  available  shall  not be
sufficient  to pay in full  the  whole  amount  so due and  unpaid,  then to the
payment thereof ratably, without preference or priority of principal


                                       38

<PAGE>



over interest, or of interest over principal,  or of any installment of interest
over any other  installment  of  interest,  or of any Bond over any other  Bond,
according to the amounts due  respectively  for principal  and interest,  to the
persons entitled  thereto without any  discrimination  or preference;  provided,
however,  that neither  moneys derived from drawings under the Letter of Credit,
Available Moneys, moneys being aged to become Available Moneys, nor the proceeds
from  remarketing  of the Bonds shall be used to pay any of the items  listed in
clause (1) of this Section, provided,  further, that moneys held in the Purchase
Fund shall only be used to pay the purchase price of the Bonds.

     SECTION  7.04.  Trustee to  Represent  Bondholders.  The  Trustee is hereby
irrevocably  appointed (and the successive  respective  Holders of the Bonds, by
taking and holding the same,  shall be conclusively  deemed to have so appointed
the Trustee) as trustee and true and lawful  attorney-in-fact  of the Holders of
the Bonds for the purpose of  exercising  and  prosecuting  on their behalf such
rights and remedies as may be available to such Holders under the  provisions of
the Bonds, this Indenture,  the Agreement,  the Act and applicable provisions of
any other law. Upon the  occurrence  and  continuance  of an Event of Default or
other  occasion  giving  rise  to a  right  in  the  Trustee  to  represent  the
Bondholders,  the Trustee in its discretion may, and upon the written request of
the Holders of not less than  twenty-five  percent (25%) in aggregate  principal
amount  of the  Bonds  then  Outstanding,  and  upon  being  indemnified  to its
satisfaction  therefor  (except any actions required to be taken by Section 7.03
hereof, in which event no indemnification shall be required),  shall, proceed to
protect or enforce its rights or the rights of such Holders by such  appropriate
action,  suit,  mandamus or other proceedings as it shall deem most effectual to
protect and enforce any such right, at law or in equity, either for the specific
performance  of any covenant or  agreement  contained  herein,  or in aid of the
execution  of any power  herein  granted,  or for the  enforcement  of any other
appropriate  legal or equitable right or remedy vested in the Trustee or in such
Holders under this Indenture,  the Agreement, the Act or any other law; and upon
instituting  such  proceeding,  the Trustee  shall be  entitled,  as a matter of
right, to the appointment of a receiver of the Revenues and other assets pledged
under this Indenture,  pending such proceedings. All rights of action under this
Indenture  or the Bonds or  otherwise  may be  prosecuted  and  enforced  by the
Trustee without the possession of any of the Bonds or the production  thereof in
any  proceeding  relating  thereto,  and any such  suit,  action  or  proceeding
instituted  by the  Trustee  shall be brought in the name of the Trustee for the
benefit  and  protection  of all the  Holders  of  such  Bonds,  subject  to the
provisions of this Indenture (including Section 6.02).

     SECTION  7.05.  Bondholders'  Direction  of  Proceedings.  Anything in this
Indenture  to  the  contrary  notwithstanding,  the  Holders  of a  majority  in
aggregate  principal amount of the Bonds then Outstanding  shall have the right,
by an instrument or concurrent  instruments in writing executed and delivered to
the Trustee,  to direct the method of conducting all remedial  proceedings taken
by the Trustee  hereunder,  provided that such direction  shall not be otherwise
than in accordance with law and the provisions of this  Indenture,  and that the
Trustee  shall have the right to decline to follow any such  direction  which in
the opinion of the Trustee  would be unjustly  prejudicial  to  Bondholders  not
parties  to such  direction  or for  which  it has not  been  provided  adequate
indemnity to its satisfaction.

     SECTION  7.06.  Limitation on  Bondholders'  Right to Sue. No Holder of any
Bond shall have the right to institute any suit,  action or proceeding at law or
in equity,  for the  protection or enforcement of any right or remedy under this
Indenture,  the Agreement,  the Act or any other  applicable law with respect to
such Bond, unless (1) such Holder shall have given to the Trustee written notice
of the  occurrence  of an Event of  Default;  (2) the  Holders  of not less than
twenty-five  percent  (25%) in  aggregate  principal  amount of the  Bonds  then
Outstanding  shall have made  written  request  upon the Trustee to exercise the
powers  hereinbefore  granted or to institute such suit, action or proceeding in
its


                                       39

<PAGE>



own name;  (3) such Holder or said  Holders  shall have  tendered to the Trustee
reasonable indemnity against the costs,  expenses and liabilities to be incurred
in  compliance  with such  request;  and (4) the Trustee  shall have  refused or
omitted to comply  with such  request for a period of sixty (60) days after such
written  request shall have been received by, and said tender of indemnity shall
have been made to, the Trustee.

     Such notification, request, tender of indemnity and refusal or omission are
hereby  declared,  in every case, to be conditions  precedent to the exercise by
any Holder of Bonds of any remedy  hereunder  or under law; it being  understood
and  intended  that no one or more  Holders of Bonds shall have any right in any
manner  whatever  by his or their  action to affect,  disturb or  prejudice  the
security of this  Indenture or the rights of any other  Holders of Bonds,  or to
enforce  any  right  under  this  Indenture,  the  Agreement,  the Act or  other
applicable law with respect to the Bonds,  except in the manner herein provided,
and that all  proceedings at law or in equity to enforce any such right shall be
instituted, had and maintained in the manner herein provided and for the benefit
and  protection  of  all  Holders  of  the  Outstanding  Bonds,  subject  to the
provisions of this Indenture (including Section 6.02).

     SECTION 7.07. Absolute Obligation of Authority.  Nothing in Section 7.06 or
in any other  provision  of this  Indenture,  or in the Bonds,  contained  shall
affect  or  impair  the  obligation  of the  Authority,  which is  absolute  and
unconditional,  to pay  the  principal  of and  interest  on  the  Bonds  to the
respective  Holders of the Bonds at their respective dates of maturity,  or upon
acceleration or call for  redemption,  as herein  provided,  but only out of the
Revenues and other assets herein pledged therefor, or affect or impair the right
of such  Holders,  which is also  absolute  and  unconditional,  to enforce such
payment by virtue of the contract embodied in the Bonds.

     SECTION 7.08. Termination of Proceedings.  In case any proceedings taken by
the  Trustee or any one or more  Bondholders  on account of any Event of Default
shall  have been  discontinued  or  abandoned  for any reason or shall have been
determined adversely to the Trustee or the Bondholders,  then in every such case
the  Authority,  the Bank,  the  Trustee  and the  Bondholders,  subject  to any
determination in such  proceedings,  shall be restored to their former positions
and rights  hereunder,  severally and  respectively,  and all rights,  remedies,
powers and duties of the Authority,  the Bank,  the Trustee and the  Bondholders
shall continue as though no such  proceedings had been taken.  The Trustee shall
deliver copies of all  proceedings  taken by the Trustee under this Indenture to
the Tender Agent.

     SECTION 7.09.  Remedies Not Exclusive.  No remedy herein  conferred upon or
reserved to the Trustee,  the Bank or to the Holders of the Bonds is intended to
be exclusive of any other remedy or remedies, and each and every such remedy, to
the extent  permitted by law,  shall be cumulative  and in addition to any other
remedy  given  hereunder  or now or  hereafter  existing  at law or in equity or
otherwise.

     SECTION 7.10. No Waiver of Default.  In the event any agreement or covenant
contained in this  Indenture  should be breached by the Authority and thereafter
waived by the Trustee or the Holders of the Bonds,  such waiver shall be limited
to the  particular  breach so waived  and shall not be deemed to waive any other
breach  hereunder.  No delay or  omission of the Trustee or of any Holder of the
Bonds to exercise any right or power arising upon the  occurrence of any default
shall impair any such right or power or shall be construed to be a waiver of any
such  default or an  acquiescence  therein;  and every power and remedy given by
this  Indenture  to the Trustee or to the Holders of the Bonds may be  exercised
from time to time and as often as may be deemed expedient.

     SECTION 7.11. Consent To Defaults.  Notwithstanding any other provisions of
this  Article  VII,  so long as the Letter of Credit is in full force and effect
and the Bank has not wrongfully


                                       40

<PAGE>



dishonored  and is not  continuing  wrongfully  to dishonor  drawings  under the
Letter of Credit and all payments of principal or purchase price and interest on
the Bonds have been timely made, no Event of Default  shall be declared  (except
in a case resulting from the failure of the Borrower to pay the Trustee's fees),
nor any  remedies  exercised  with  respect to any such Events of Default by the
Trustee or by the  Bondholders  and no Event of Default under Section 7.01 shall
be waived by the Trustee or the  Bondholders to the extent they may otherwise be
permitted  hereunder,  without,  in any case,  the prior written  consent of the
Bank.  Unless an Alternate Credit Facility has been provided pursuant to Section
5.7 of the Agreement,  no Event of Default can be waived,  in any  circumstance,
unless the Letter of Credit has been fully  reinstated  and is in full force and
effect as evidenced in writing by the Bank to the Trustee.


                                  ARTICLE VIII

                          THE TRUSTEE, THE REMARKETING
                           AGENT AND THE TENDER AGENT

     SECTION  8.01.  Duties,  Immunities  and  Liabilities  of Trustee.  (A) The
Trustee shall, prior to an Event of Default,  and after the curing of all Events
of Default which may have occurred,  perform such duties and only such duties as
are  specifically  set forth in this  Indenture.  The Trustee shall,  during the
existence of any Event of Default  (which has not been cured),  exercise such of
the rights and powers vested in it by this Indenture, and use the same degree of
care and skill in its exercise,  as a prudent person would exercise or use under
the circumstances in the conduct of his own affairs.

     (B) The  Trustee  may at any  time  and for any  reason  be  removed  by an
instrument or concurrent  instruments in writing  appointing a successor Trustee
filed with the Trustee so removed  and  executed by the Holders of a majority in
aggregate principal amount of the Bonds Outstanding.  The Trustee may be removed
by an instrument  in writing,  consented to by the Bank which may be executed by
the Authority,  appointing a successor Trustee filed with the Trustee so removed
upon the occurrence of any of the following events: (i) the Trustee shall become
incapable  of acting;  (ii) the Trustee  shall be adjudged  bankrupt;  (iii) the
Trustee shall become insolvent;  (iv) a receiver is appointed for the Trustee or
its property; (v) any public officer shall take control or charge of the Trustee
or of the property or affairs for the purposes of  rehabilitation,  conservation
or  liquidation;  or (vi) the Trustee  shall cease to be eligible in  accordance
with Subsection (E) of this Section;  provided that the Authority may not remove
the  Trustee  during the  occurrence  and  continuance  of an Event of  Default.
Notwithstanding the foregoing,  the Trustee may not be removed until a successor
Trustee has been  appointed and has assumed the duties and  responsibilities  of
successor Trustee under this Indenture.

     (C) The  Trustee may at any time  resign by giving  written  notice of such
resignation to the Authority and the Bank and by giving the  Bondholders  notice
of such  resignation by mail at the addresses  shown on the  registration  books
maintained by the Bond Registrar. Upon receiving such notice of resignation, the
Authority  shall  promptly  appoint,  with the consent of the Bank,  a successor
Trustee by an  instrument  in writing.  The Trustee shall not be relieved of its
duties until such successor Trustee has accepted its appointment.

     (D)  Any  removal  or  resignation  of the  Trustee  and  appointment  of a
successor  Trustee shall become effective only upon acceptance of appointment by
the successor  Trustee.  If no successor  Trustee shall have been  appointed and
have  accepted  appointment  within  forty-five  (45) days of  giving  notice of
removal or notice of  resignation  as aforesaid,  the  resigning  Trustee or any
Bondholder  (on behalf of himself and all other  Bondholders)  may  petition any
court of competent jurisdiction for the


                                       41

<PAGE>



appointment of a successor  Trustee,  and such court may  thereupon,  after such
notice (if any) as it may deem  proper,  appoint  such  successor  Trustee.  Any
successor Trustee  appointed under this Indenture,  shall signify its acceptance
of such  appointment  by executing  and  delivering  to the Authority and to its
predecessor Trustee a written acceptance thereof and a written instrument by the
successor Trustee  indemnifying the predecessor  Trustee for all costs or claims
arising after the acceptance of appointment hereunder relating to such successor
Trustee's  performance  of its duties under this  Indenture,  and  thereupon and
after the payment by the  Authority of all unpaid fees and  expenses  (including
legal fees and  expenses) of the  predecessor  Trustee such  successor  Trustee,
without any further act,  deed or  conveyance,  shall become vested with all the
moneys, estates,  properties,  rights, powers, trusts, duties and obligations of
such  predecessor  Trustee,  with like  effect as if  originally  named  Trustee
herein; but,  nevertheless at the Request of the Authority or the request of the
successor  Trustee,  such predecessor  Trustee shall execute and deliver any and
all  instruments of conveyance or further  assurance and do such other things as
may  reasonably  be  required  for  more  fully  and  certainly  vesting  in and
confirming to such successor  Trustee all the right,  title and interest of such
predecessor  Trustee in and to any property held by it under this  Indenture and
shall pay over, transfer,  assign and deliver to the successor Trustee any money
or other property  subject to the trusts and conditions  herein set forth.  Upon
request of the successor  Trustee,  the Authority  shall execute and deliver any
and all  instruments as may be reasonably  required for more fully and certainly
vesting in and  confirming to such successor  Trustee all such moneys,  estates,
properties,  rights, powers, trusts, duties and obligations.  Upon acceptance of
appointment by a successor Trustee as provided in this subsection, the Authority
shall mail a notice of the succession of such Trustee to the trusts hereunder to
each rating  agency which is then rating the Bonds,  to the  Bondholders  at the
addresses shown on the registration books maintained by the Bond Registrar,  and
to the Bank. If the Authority fails to mail such notice within fifteen (15) days
after acceptance of appointment by the successor Trustee,  the successor Trustee
shall cause such notice to be mailed at the expense of the Authority.

     (E)  Any  Trustee  appointed  under  the  provisions  of  this  Section  in
succession  to the Trustee shall be a trust company or bank having the powers of
a trust company, having a combined capital and surplus of at least fifty million
dollars  ($50,000,000),  and subject to supervision or examination by federal or
state authority.  If such bank or trust company  publishes a report of condition
at least annually,  pursuant to law or to the requirements of any supervising or
examining  authority  above referred to, then for the purpose of this subsection
the combined  capital and surplus of such bank or trust  company shall be deemed
to be its combined capital and surplus as set forth in its most recent report of
condition  so  published.  In case at any time  the  Trustee  shall  cease to be
eligible in accordance  with the provisions of this  subsection (E), the Trustee
shall  resign  immediately  in the manner and with the effect  specified in this
Section.

     SECTION 8.02. Merger or  Consolidation.  Any company into which the Trustee
may be merged or converted or with which it may be  consolidated  or any company
resulting from any merger,  conversion or  consolidation  to which it shall be a
party  or any  company  to  which  the  Trustee  may  sell  or  transfer  all or
substantially  all of its corporate trust business,  provided such company shall
be eligible under  subsection (E) of Section 8.01 shall be the successor to such
Trustee  without  the  execution  or  filing of any  paper or any  further  act,
anything herein to the contrary notwithstanding.

     SECTION 8.03. Liability of Trustee. (A) The recitals of facts herein and in
the Bonds  contained  shall be taken as  statements  of the  Authority,  and the
Trustee shall assume no responsibility  for the correctness of the same, or make
any  representations  as to the validity or  sufficiency of this Indenture or of
the Bonds. In addition,  the Trustee shall assume no responsibility with respect
to this  Indenture  or  Bonds  other  than in  connection  with  the  duties  or
obligations  assigned to or imposed upon the Trustee herein or in the Bonds. The
Trustee shall, however, be responsible for its representations


                                       42

<PAGE>



contained in its certificate of  authentication  on the Bonds. The Trustee shall
not be liable in connection with the performance of its duties hereunder, except
for its own negligence or willful  misconduct.  The Trustee may become the owner
of Bonds with the same rights it would have if it were not  Trustee  and, to the
extent  permitted  by law,  may act as  depositary  for  and  permit  any of its
officers  or  directors  to act as a member  of, or in any other  capacity  with
respect to, any committee  formed to protect the rights of Bondholders,  whether
or not such  committee  shall  represent  the Holders of a majority in principal
amount of the Bonds then Outstanding.

     The Trustee  may  execute any of the trusts or powers set forth  herein and
perform the duties required of it hereunder by or through attorneys,  agents, or
receivers, and shall be entitled to the advice of counsel concerning all matters
of trusts and its duties herein, and the Trustee shall not be answerable for the
default or misconduct  of any such  attorney,  agent or receiver  selected by it
with reasonable care.

     (B) The Trustee  shall not be liable for any error of judgment made in good
faith by a responsible  officer,  unless it shall be proved that the Trustee was
negligent in ascertaining the pertinent facts.

     (C) The  Trustee  shall not be liable with  respect to any action  taken or
omitted to be taken by it in good faith in accordance  with the direction of the
Holders of not less than a majority in aggregate  principal  amount of the Bonds
at the time Outstanding relating to the time, method and place of conducting any
proceeding for any remedy  available to the Trustee,  or exercising any trust or
power conferred upon the Trustee under this Indenture.

     (D) The Trustee  shall be under no obligation to exercise any of the rights
or powers vested in it by this  Indenture at the request,  order or direction of
any of the Bondholders  pursuant to the provisions of this Indenture unless such
Bondholders shall have offered to the Trustee satisfactory security or indemnity
against the costs,  expenses and  liabilities  which may be incurred  therein or
thereby.

     (E) The  Trustee  shall not be liable  for any  action  taken by it in good
faith and believed by it to be authorized or within the  discretion or rights or
powers  conferred  upon it by this  Indenture  except for its own  negligence or
wilful misconduct.

     (F) The  Trustee  shall not be deemed to have  knowledge  of any default or
Event of  Default  hereunder  unless and until it shall  have  actual  knowledge
thereof,  or shall  have  received  written  notice  thereof,  at its  principal
corporate  trust office.  Except as otherwise  expressly  provided  herein,  the
Trustee  shall not be bound to  ascertain  or inquire as to the  performance  or
observance of any of the terms, conditions, covenants or agreements herein or of
any of the  documents  executed  in  connection  with  the  Bonds,  or as to the
existence of a default or Event of Default thereunder.  The Trustee shall not be
responsible for the validity or effectiveness of any collateral given to or held
by it.

     (G) No provision of this  Indenture  shall require the Trustee to expend or
risk its own funds or otherwise incur any financial liability in the performance
of any of its duties hereunder,  or in the exercise of its rights or powers. The
Trustee  shall,  however,  in any case make drawings under the Letter of Credit,
pay principal of or interest on the Bonds as it becomes due, and  accelerate the
Bonds as required by this  Indenture,  notwithstanding  anything to the contrary
herein.

     SECTION 8.04.  Right of Trustee to Rely on Documents.  The Trustee shall be
protected  in acting  upon any  notice,  resolution,  request,  consent,  order,
certificate,  report, opinion, bond or other paper or document believed by it to
be genuine and to have been signed or presented by the


                                       43

<PAGE>



proper  party or  parties.  The Trustee may  consult  with  counsel,  who may be
counsel of or to the Authority,  with regard to legal questions, and the opinion
of such  counsel  shall be full and complete  authorization  and  protection  in
respect of any action  taken or  suffered by it  hereunder  in good faith and in
accordance therewith.

     The Trustee  shall not be bound to recognize  any person as the Holder of a
Bond unless and until such Bond is submitted for  inspection,  if required,  and
his title thereto is satisfactorily established, if disputed.

     Whenever  in the  administration  of the  trusts  imposed  upon  it by this
Indenture  the Trustee  shall deem it necessary  or  desirable  that a matter be
proved or established  prior to taking or suffering any action  hereunder,  such
matter  (unless  other  evidence  in  respect  thereof  be  herein  specifically
prescribed)  may be  deemed  to be  conclusively  proved  and  established  by a
Certificate of the Authority,  and such Certificate shall be full warrant to the
Trustee for any action taken or suffered in good faith under the  provisions  of
this  Indenture in reliance upon such  Certificate,  but in its  discretion  the
Trustee  may,  in lieu  thereof,  accept  other  evidence  of such matter or may
require such additional evidence as it may deem reasonable.

     SECTION 8.05.  Preservation  and  Inspection  of  Documents.  All documents
received by the Trustee under the provisions of this Indenture shall be retained
in its possession and shall be subject at all reasonable times to the inspection
of the Authority and any Bondholder,  and their agents and representatives  duly
authorized in writing, at reasonable hours and under reasonable conditions.

     SECTION 8.06.  Compensation  and  Indemnification.  The Authority shall pay
(solely from Additional  Payments) to the Trustee and the Tender Agent from time
to time reasonable  compensation for all services rendered under this Indenture,
and also all reasonable expenses,  charges,  legal and consulting fees and other
disbursements and those of its attorneys, agents and employees,  incurred in and
about the  performance  of its powers and duties under this  Indenture,  and the
Trustee  and the Tender  Agent each  shall have a lien  therefor  on any and all
funds (except  moneys on deposit in the Purchase  Fund,  the Rebate Fund and the
Letter  of  Credit  Account,  Available  Moneys,  moneys  being  aged to  become
Available Moneys and funds held for the payment of Bonds or the interest thereon
which is past due or for which notice of redemption has been mailed) at any time
held by it under this  Indenture  which lien shall be prior and  superior to the
lien of the Holders of the Bonds.

     SECTION 8.07. Notice to Rating Agency.  The Authority and the Trustee shall
give written  notice to each rating  agency then rating the Bonds of each of the
following: (i) a successor Trustee is appointed hereunder;  (ii) this Indenture,
the  Agreement,   the  Remarketing  Agreement,  the  Letter  of  Credit  or  the
Reimbursement  Agreement  is amended or  supplemented  in any manner;  (iii) the
Bonds are  converted  to a Fixed  Interest  Rate  pursuant  to  Section  2.03 or
defeased  pursuant to Section 10.01 or  accelerated  pursuant to Section 7.01 or
redeemed  in  whole   pursuant  to  Section  4.01;   or  (iv)  the   expiration,
substitution, termination or extension of the Letter of Credit.

     SECTION 8.08.  Qualifications  of Remarketing  Agent. The Remarketing Agent
shall be a member of the National Association of Securities Dealers,  Inc. or be
a banking  corporation or trust  company,  having a  capitalization  of at least
$15,000,000  and shall be  authorized  by law to perform all the duties  imposed
upon it by this Indenture.  The Remarketing  Agent may at any time resign and be
discharged of the duties and obligations  created by this Indenture by giving at
least 45 days'  notice to the  Authority,  the  Borrower,  the Bank,  the Tender
Agent,  the Trustee,  S&P and Moody's,  to the extent each rating agency is then
rating  the Bonds.  The  Remarketing  Agent may be  removed at any time,  at the
request of the  Borrower  and the  Authority,  by an  instrument,  signed by the
Borrower and the Authority


                                       44

<PAGE>



and filed  with the  Remarketing  Agent,  the  Bank,  the  Tender  Agent and the
Trustee.  The Borrower and the  Authority,  with the consent of the Bank,  shall
appoint a successor Remarketing Agent.

     The Remarketing  Agent shall designate to the Trustee its principal  office
and signify its acceptance of the duties and obligations imposed on it hereunder
by a written instrument of acceptance delivered to the Authority and the Trustee
and the Tender Agent under which the Remarketing Agent will agree to perform the
obligations of the Remarketing Agent set forth in Section 8.09 hereof.

     If the  Letter of  Credit  is  terminated  for any  reason,  or an Event of
Default under this Indenture occurs,  the Remarketing Agent shall have the right
to resign  immediately.  The initial  Remarketing  Agent appointed  hereunder is
Rauscher Pierce Refsnes, Inc.

     SECTION 8.09.  Remarketing of Bonds. (A) The Tender Agent shall immediately
provide the Remarketing  Agent, the Bank and the Trustee with telephonic notice,
promptly confirmed by written notice by 12:00 noon, California time, on the next
succeeding  Business  Day, of the receipt by the Tender Agent of a tender notice
from any Bondholder  pursuant to Section 4.06 or the receipt by the Tender Agent
of a notice from the Borrower of its election to substitute an Alternate  Letter
of Credit for the then existing  Letter of Credit pursuant to Section 5.8 of the
Agreement and providing the Remarketing Agent, the Bank and the Trustee with the
information  contained in such notices.  Upon receipt of such telephonic notice,
the Remarketing  Agent shall offer for sale and use its best efforts to sell the
Bonds described in such notice, any such sale to be made at a price equal to the
principal amount thereof plus accrued interest.

     (B) The Remarketing  Agent shall (i) by 4:00 p.m.,  California time, on the
Business Day prior to the Purchase Date, give telegraphic or telephonic  notice,
promptly  confirmed by a written notice,  to the Trustee,  the Tender Agent, the
Borrower and the Bank (A) directing the Tender Agent to make  available for pick
up by 11:00 a.m.,  California  time,  on the  Purchase  Date,  at the  principal
corporate  trust  office of the  Tender  Agent (or at such  other  office as the
Tender  Agent shall  designate)  any Bonds for which the  Remarketing  Agent has
arranged  sales  pursuant to this  Section  8.09 and (B)  stating the  principal
amount of Bonds sold pursuant to subsection  (A) of this Section 8.09,  and (ii)
deliver or cause to be  delivered  to the Tender Agent at or prior to 8:00 a.m.,
California  time, on the Purchase Date the principal of and interest  accrued to
such  Purchase  Date on the Bond or  Bonds to be so  purchased  that  have  been
remarketed by the  Remarketing  Agent,  in  immediately  available  funds.  Upon
receipt of amounts for the  purchase of Bonds from the  Remarketing  Agent,  the
Tender  Agent shall  immediately  give  telephonic  notice to the  Trustee,  the
Borrower  and the  Bank,  promptly  confirmed  in  writing  of (i) the  proceeds
received from the  Remarketing  Agent to be applied to the purchase of the Bonds
tendered for  purchase,  and (ii) the amount that must be drawn under the Letter
of Credit for Bonds which have been  tendered  as to which the Tender  Agent has
not received the principal of and interest  accrued thereon to the Purchase Date
from the Remarketing  Agent.  None of the moneys so provided to the Tender Agent
for purchase of Bonds may be derived  directly or indirectly  from the Borrower,
any Related Party or the Authority and therefore the Bonds may not be remarketed
to any such entity or person.  The notice by the Remarketing Agent shall specify
the names, addresses,  and taxpayer identification numbers of the purchasers of,
and the principal amount and  denominations of, such Bonds, if any, for which it
has found  purchasers as of such date and the principal amount of such Bonds, if
any,  for which it has not found  purchasers  as of such date.  The Tender Agent
shall make available for pick up new Bonds properly executed,  registered in the
name(s) and issued in Authorized Denominations as may be specified in the notice
by the Remarketing Agent to the Tender Agent by 11:00 a.m.,  California time, on
the Purchase  Date.  The  Remarketing  Agent and the Tender Agent shall hold all
moneys  available  for the  purchase of Bonds in trust solely for the benefit of
the person or entity  which  shall have so  delivered  such  moneys  until Bonds
purchased with such moneys shall have been delivered to or for


                                       45

<PAGE>



the account of such person or entity,  and such moneys  shall not be  commingled
with any  other  moneys.  Under  no  circumstances  shall  the  Tender  Agent be
obligated to expend any of its own funds in connection with this Indenture.

     (C) On the date Bonds are to be  purchased  pursuant to Section  8.10,  the
Trustee shall, prior to 8:30 a.m., California time, draw on the Letter of Credit
in accordance with the provisions thereof to the extent of the purchase price of
the Bonds  for  which  the  Tender  Agent  has not  received  proceeds  from the
remarketing  of such Bonds as  evidenced  by the notice from the Tender Agent to
the Trustee and shall  immediately  transfer or direct the proceeds of such draw
to the Tender  Agent to pay the  purchase  price of such  Bonds on the  Purchase
Date;  provided  however,  that no  drawings  shall be made  under the Letter of
Credit to purchase Bonds held by or for the account of the Borrower or the Bank.

     SECTION 8.10.  Creation of Purchase  Fund;  Purchase of Bonds  Delivered to
Tender Agent. (A) There is hereby created and established with the Tender Agent,
in a trust capacity, a separate fund to be designated as the "Purchase Fund" and
there shall be created  within the Purchase Fund (i) a separate  account  called
the  "Remarketing  Account" into which all moneys  representing  the proceeds of
remarketing  pursuant  to  Section  8.09  (which  moneys  shall  be  in  a  form
immediately  available  on the  Purchase  Date)  shall be  deposited  and (ii) a
separate  account  called the  "Liquidity  Account"  into which the  proceeds of
drawings by the Trustee under the Letter of Credit shall be  deposited.  None of
the Borrower,  any Related Party,  the Trustee nor the Authority  shall have any
legal,  equitable or beneficial  right,  title or interest in the moneys held by
the  Remarketing  Agent or by the  Tender  Agent in the  Purchase  Fund,  or the
Remarketing  Account or Liquidity  Account  therein.  The Purchase Fund and each
such Account shall be established and maintained by the Tender Agent and held in
trust apart from all other moneys and  securities  held under this  Indenture or
otherwise,  and over which the Tender  Agent shall have the  exclusive  and sole
right of  withdrawal  for the  exclusive  benefit of the  persons  tendering  or
purchasing  Bonds with respect to which amounts were deposited into the Purchase
Fund and the Accounts created therein.

     On each day on which Bonds have been tendered for purchase or are deemed to
have been  tendered for  purchase  pursuant to this  Indenture,  after paying or
making  provision for the payment of the purchase price of such Bonds as in this
Indenture  provided,  the  Tender  Agent  shall  promptly  remit to the Bank any
moneys,  but not  exceeding  the  amount  drawn on the Letter of Credit for such
purchase, on deposit in the Liquidity Account not used to purchase Bonds.

     (B) Funds for the purchase of Bonds at the  principal  amount  thereof plus
unpaid  interest  accrued to the Purchase Date, if any, shall be paid out of the
Purchase Fund in the order of priority indicated:

          (i) from the  Remarketing  Account,  proceeds from the  remarketing of
Bonds pursuant to Section 8.09 hereof; and

          (ii) from the Liquidity  Account,  moneys  representing  proceeds of a
drawing by the Trustee under the Letter of Credit.

     (C) In the event that Bonds are not purchased pursuant to this Section, the
Trustee shall pay the  principal  amount of Bonds  tendered  pursuant to Section
4.06 or Bonds subject to mandatory  tender  pursuant to Section 4.07 with moneys
on deposit in the Revenue  Fund  pursuant to Section 5.02 hereof and cancel such
Bonds.



                                       46

<PAGE>



     (D) The Tender Agent shall:

          (i) hold all Bonds  delivered to it pursuant to Sections 4.06, 4.07 or
8.11 in trust solely for the benefit of the respective  Holders which shall have
so delivered  such Bonds until moneys  representing  the purchase price for such
Bonds shall have been delivered to or for the account of or to the order of such
Holders; and

          (ii) hold all moneys  delivered  to it under this Section 8.10 for the
purchase of Bonds in trust  solely for the benefit of the person or entity which
shall have so delivered  such moneys until the Bonds  purchased with such moneys
shall have been delivered to or for the account of such person or entity;

          (iii) only make such  payments  called for under this  Indenture  from
immediately available funds transferred to the Tender Agent for payment pursuant
to  this  Indenture  which  funds  are  on  deposit  in an  appropriate  account
maintained by the Tender Agent;

          (iv)  under no  circumstances  be  obligated  to expend any of its own
funds in connection with this Indenture;

          (v) in  acting  with  regard  to the  purchase  of  Bonds  under  this
Indenture be acting as a conduit and shall not be  purchasing  Bonds for its own
account, and in the absence of written notice from the Authority or the Trustee,
shall be entitled to assume that any Bond tendered to it, or deemed  tendered to
it for purchase, is entitled under this Indenture to be so purchased; and

          (vi) notify the Remarketing Agent by telephone, telegram or other form
of  electronic  communication  of the contents  of, and promptly  deliver to the
Borrower, the Trustee, the Remarketing Agent and the Bank a copy of, each notice
delivered  to it in  accordance  with  Section  4.06 and,  immediately  upon the
delivery to it of Bonds in accordance with said Section 4.06,  give  telegraphic
or telephonic  notice to the Borrower,  the Trustee and the Bank  specifying the
principal amount of the Bonds so delivered.

     SECTION 8.11. Delivery of Bonds.

     (A) Bonds  purchased  by the  Tender  Agent with the  moneys  described  in
subsection (B)(i) of Section 8.10 shall be made available by the Tender Agent to
the new purchasers.

     (B) (i) Bonds paid with the moneys  described in subsection  (C) of Section
8.10 shall be cancelled.

          (ii)  Bonds  paid  by  the  Tender  Agent  with  moneys  described  in
subsection  (B)(ii) of Section 8.10 shall be held by the Tender Agent as Pledged
Bonds  pursuant  to the Pledge and  Security  Agreement  for the  account of the
Borrower in which Bank shall have a security interest.

     (C)  Bonds  which  have  been  delivered  to the  Tender  Agent  and  which
thereafter  have  been  sold  shall  be  delivered  to such  new  owners  as the
Remarketing  Agent or the Bank may designate to the Tender Agent,  but only upon
(i) written  confirmation  to the Trustee by the Bank that the stated  amount of
the Letter of Credit has been  reinstated  with respect to the  principal of the
Bonds being so re-registered and delivered, together with the portion of the


                                       47

<PAGE>



Letter of Credit used to pay accrued interest for the purchase of such Bonds and
(ii)  written  confirmation  to the Tender  Agent by the Trustee that the stated
amount of the Letter of Credit has been reinstated with respect to the principal
of the Bonds being so re-registered and delivered,  together with the portion of
the Letter of Credit  used to pay  accrued  interest  for the  purchase  of such
Bonds.

     The Authority shall cooperate with the Trustee,  the Tender Agent,  and the
Borrower to cause the  necessary  arrangements  to be made and to be  thereafter
continued whereby funds from the sources specified herein will be made available
for the purchase of Bonds presented at the principal  office of the Tender Agent
and whereby  Bonds  executed by the Authority  and  authenticated  by the Tender
Agent,  shall be made available to the extent necessary for delivery pursuant to
this Section 8.11.

     SECTION  8.12.  Delivery of Proceeds of  Remarketing.  The  proceeds of the
remarketing by the Remarketing Agent of any Bonds delivered to the Tender Agent,
or delivered to the Remarketing Agent by the Bank or any other Bondholder, shall
be turned over to the Bank or such other Bondholder, as the case may be.

     SECTION  8.13.  No  Purchases  or Sales  After  Default.  Anything  in this
Indenture to the contrary notwithstanding,  there shall be no purchases or sales
of Bonds  pursuant  to this  Article  VIII if there shall have  occurred  and be
continuing  an Event of Default  described in clauses  (A)-(C) of Section  7.01.
Anything in this  Indenture to the contrary  notwithstanding,  there shall be no
remarketing  of Bonds pursuant to this Article VIII if there shall have occurred
and be continuing any Event of Default described in Section 7.01 or if any event
shall have occurred which with notice or the lapse of time would constitute such
an Event of Default.

     SECTION 8.14.  Qualifications  of Tender Agent. The Tender Agent shall be a
bank or trust company or another institution which has a rating on its long-term
debt from  Moody's of at least  "Baa3" and a short term rating of at least "P-3"
authorized  to perform  all duties  imposed  upon it by this  Indenture  and the
Remarketing Agreement. The Tender Agent may at any time resign and be discharged
of the duties and obligations created by this Indenture by giving at least sixty
(60) days' notice to the Authority,  the Borrower, the Remarketing Agent and the
Trustee.  With the consent of the Bank,  the Tender  Agent may be removed at any
time by the Authority, by an instrument, signed by the Authority, filed with the
Tender Agent, the Remarketing Agent and the Trustee.

     The initial Tender Agent  appointed  under this Indenture is First Trust of
California,  National Association.  The Authority, with the consent of the Bank,
shall  appoint a successor  Tender Agent.  In the event the  Authority  fails to
appoint a successor  Tender Agent prior to the effective  date of the removal or
resignation of the current Tender Agent,  the existing Tender Agent shall remain
in place until a successor  Tender  Agent is  appointed.  If a successor  Tender
Agent is not appointed  within  thirty (30) days as provided  herein the Trustee
shall be appointed as the successor  Tender Agent. The Authority shall appoint a
Tender  Agent in New York,  New York,  to the  extent  necessary  for the proper
marketing of the Bonds.

     SECTION 8.15. Paying Agent. The Authority, with the written approval of the
Bank,  may  appoint  and at all times have a Paying  Agent in such cities as the
Authority deems desirable, for the payment of the principal of, and the interest
(and premium,  if any) on, the Bonds.  The Authority hereby appoints the Trustee
as  paying  agent  in  San  Francisco,  California.  The  Trustee  shall  not be
responsible  for the  failure  of the  Bank or any  other  party  to make  funds
available to the Trustee.



                                       48

<PAGE>



     SECTION  8.16.  Several  Capacities.  Anything  in  this  Indenture  to the
contrary  notwithstanding,  the same entity may serve  hereunder as the Trustee,
Tender Agent, Remarketing Agent and Paying Agent and in any other combination of
such capacities, to the extent permitted by law.


                                   ARTICLE IX

                   MODIFICATION OR AMENDMENT OF THE INDENTURE

     SECTION 9.01. Amendments  Permitted.  (A) This Indenture and the rights and
obligations  of the Authority and of the Holders of the Bonds and of the Trustee
may be modified or amended  from time to time and at any time by an indenture or
indentures  supplemental thereto,  which the Authority and the Trustee may enter
into  when the  written  consent  of the  Holders  of a  majority  in  aggregate
principal amount of all Bonds then Outstanding,  the Borrower and the Bank shall
have been filed with the Trustee.  No such  modification  or amendment shall (1)
extend  the fixed  maturity  of any  Bond,  or reduce  the  amount of  principal
thereof,  or extend the time of payment,  or change the method of computing  the
rate of interest  thereon,  or extend the time of payment of  interest  thereon,
without  the consent of the Holder of each Bond so  affected,  or (2) reduce the
aforesaid percentage of Bonds the consent of the Holders of which is required to
effect any such modification or amendment, or permit the creation of any lien on
the Revenues  and other assets  pledged  under this  Indenture  prior to or on a
parity with the lien  created by this  Indenture,  or deprive the Holders of the
Bonds of the lien created by this  Indenture  on such  Revenues and other assets
(except as  expressly  provided in this  Indenture),  without the consent of the
Holders  of all of the Bonds  then  Outstanding,  or (3)  adversely  affect  the
interests of the Tender Agent without its prior written consent. It shall not be
necessary for the consent of the  Bondholders to approve the particular  form of
any  Supplemental  Indenture,  but it shall be  sufficient if such consent shall
approve the substance thereof. Promptly after the execution by the Authority and
the Trustee of any Supplemental  Indenture  pursuant to this subsection (A), the
Trustee shall mail a copy of the Supplemental  Indenture to the Tender Agent and
mail a notice, setting forth in general terms the substance of such Supplemental
Indenture,  to each  rating  agency then rating the Bonds and the Holders of the
Bonds at the address shown on the registration books of the Trustee. Any failure
to give such  notice,  or any defect  therein,  shall not,  however,  in any way
impair or affect the validity of any such Supplemental Indenture.

     (B) This Indenture and the rights and obligations of the Authority,  of the
Trustee and of the  Holders of the Bonds may also be  modified  or amended  from
time to time and at any time by an indenture or indentures  supplemental hereto,
which the  Authority  and the Trustee may enter into  without the consent of any
Bondholders  but with the written consent of the Borrower and the Bank, but only
to the extent  permitted by law including,  without  limitation,  for any one or
more of the following purposes:

          (1) to add to the covenants and agreements of the Authority  contained
in this Indenture other covenants and agreements  thereafter to be observed,  to
pledge or assign additional security for the Bonds, or to surrender any right or
power herein reserved to or conferred upon the Authority;

          (2) to make such  provisions  for the purpose of curing any ambiguity,
inconsistency or omission,  or of curing or correcting any defective  provision,
contained in this Indenture,  or in regard to matters or questions arising under
this  Indenture,  as the Authority may deem necessary or desirable  which do not
adversely affect the rights of the Bondholders hereunder;


                                       49

<PAGE>




          (3) to modify, amend or supplement this Indenture in such manner as to
permit  the  qualification  hereof  under the Trust  Indenture  Act of 1939,  as
amended,  or any similar  federal statute  hereafter in effect,  and to add such
other  terms,  conditions  and  provisions  as may be  permitted  by said act or
similar federal statute;

          (4) to make such provisions for the purpose of conforming to the terms
and provisions of any Alternate Letter of Credit or Alternate Credit Facility or
to obtain a rating on the Bonds which do not adversely  affect the rights of the
Bondholders hereunder; and

          (5) to modify, amend or supplement this Indenture in any other respect
which does not adversely  affect the rights of the  Bondholders  hereunder.  The
Trustee shall give notice of any such  modification  or amendment to each rating
agency then rating the Bonds.

     (C) The Trustee may in its discretion, but shall not be obligated to, enter
into any such  Supplemental  Indenture  authorized by subsections  (A) or (B) of
this Section which materially adversely affects the Trustee's own rights, duties
or immunities under this Indenture or otherwise.

     SECTION 9.02. Effect of Supplemental  Indenture.  Upon the execution of any
Supplemental  Indenture pursuant to this Article, this Indenture shall be deemed
to be modified and amended in accordance  therewith,  and the respective rights,
duties and  obligations  under this Indenture of the Authority,  the Trustee and
all Holders of Bonds Outstanding  shall thereafter be determined,  exercised and
enforced  hereunder  subject in all respects to such modification and amendment,
and all the terms and  conditions of any such  Supplemental  Indenture  shall be
deemed to be part of the terms and  conditions of this Indenture for any and all
purposes.

     SECTION  9.03.  Endorsement  of  Bonds;  Preparation  of New  Bonds.  Bonds
delivered  after the execution of any  Supplemental  Indenture  pursuant to this
Article  may,  and if the  Authority  so  determines  shall,  bear a notation by
endorsement   or  otherwise  in  form  approved  by  the  Authority  as  to  any
modification or amendment provided for in such Supplemental  Indenture,  and, in
that case, upon demand of the Holder of any Bond Outstanding at the time of such
execution and presentation of his Bond for the purpose at the office of the Bond
Registrar or at such  additional  offices as the Bond  Registrar  may select and
designate for that purpose,  a suitable  notation shall be made on such Bond. If
the  Supplemental  Indenture  shall so  provide,  new  Bonds so  modified  as to
conform,  in the opinion of the  Authority,  to any  modification  or  amendment
contained in such Supplemental Indenture,  shall be prepared and executed by the
Authority  and  authenticated  by the Bond  Registrar,  and upon  demand  of the
Holders of any Bonds then Outstanding shall be exchanged at the principal office
of  the  Bond  Registrar,  without  cost  to  any  Bondholder,  for  Bonds  then
Outstanding,  upon surrender for  cancellation of such Bonds, in equal aggregate
principal amounts of the same Series and maturity.

     SECTION 9.04. Amendment of Particular Bonds. The provisions of this Article
shall  not  prevent  any  Bondholder  from  accepting  any  amendment  as to the
particular Bonds held by such Bondholder,  provided that due notation thereof is
made on such Bonds.




                                       50

<PAGE>



                                    ARTICLE X

                                   DEFEASANCE

     SECTION  10.01.  Discharge  of  Indenture.  The  Bonds  may be  paid by the
Authority in any of the following ways, provided that the Authority also pays or
causes to be paid any other sums payable hereunder by the Authority:

     (A) by paying or causing to be paid with Available Moneys the principal of,
interest and premium,  if any, on the Bonds, as and when the same become due and
payable;

     (B) by depositing with the Trustee, in trust, at or before maturity,  money
or securities in the necessary  amount (as provided in Section  10.03) to pay or
redeem with Available Moneys all Bonds then Outstanding; or

     (C) by delivering to the Trustee,  for  cancellation  by it, the Bonds then
Outstanding.

     If the Bonds are paid by the  Authority  pursuant to this Section  10.01(B)
prior to the Fixed Rate Date,  the Authority  and the Borrower  shall provide to
the  Trustee  written  evidence  from  Moody's,  if the Bonds are then  rated by
Moody's,  and S&P,  if the Bonds are then rated by S&P,  to the effect that such
payment  will  not  result  in a  withdrawal  of its  rating  on the  Bonds or a
reduction  from the rating which then exists as to the Bonds.  If the  Authority
shall  also pay or cause to be paid all  other  sums  payable  hereunder  by the
Authority, then and in that case, at the election of the Authority (evidenced by
a Certificate of the Authority, filed with the Trustee, signifying the intention
of the Authority to discharge all such  indebtedness  and this  Indenture),  and
notwithstanding that any Bonds shall not have been surrendered for payment, this
Indenture and the pledge of Revenues and other assets made under this  Indenture
and all covenants,  agreements and other obligations of the Authority under this
Indenture shall cease,  terminate,  become void and be completely discharged and
satisfied except only as provided in Section 10.02. In such event,  upon Request
of the  Authority,  the  Trustee  shall cause an  accounting  for such period or
periods as may be requested  by the  Authority to be prepared and filed with the
Authority and shall execute and deliver to the Authority all such instruments as
may be necessary or desirable to evidence such discharge and  satisfaction,  and
the Trustee shall pay over, transfer, assign or deliver all moneys or securities
or other property held by it pursuant to this  Indenture  which are not required
for the payment of  obligations to be paid from  Additional  Payments or for the
payment or redemption of Bonds not  theretofore  surrendered for such payment or
redemption  in the following  order (1) first,  to the Bank to the extent of any
amounts  due to the  Bank  pursuant  to the  Reimbursement  Agreement,  and  (2)
otherwise,  to the  Borrower,  provided  that  moneys  in the  Letter  of Credit
Account,  the Liquidity Account and the Remarketing Account shall be returned to
the Bank.

     SECTION 10.02.  Discharge of Liability on Bonds.  Upon the deposit with the
Trustee,  in  trust,  at or  before  maturity,  of  money or  securities  in the
necessary amount (as provided in Section 10.03) to pay or redeem all Outstanding
Bonds  (whether  upon or prior to the  maturity or the  redemption  date of such
Bonds),  provided  that,  if any of  such  Bonds  are to be  redeemed  prior  to
maturity, notice of such redemption shall have been given as provided in Article
IV or provision  satisfactory to the Trustee shall have been made for the giving
of such notice,  then all  liability  of the  Authority in respect of such Bonds
shall  cease,  terminate  and be  completely  discharged,  except  only that the
Holders  thereof  shall  thereafter  be entitled to payment of the  principal or
redemption price, as applicable, of and interest on such Bonds by the Authority,
and the Authority  shall remain  liable for such  payment,  but only out of such
money or securities  deposited  with the Trustee as aforesaid for their payment,
provided further,  however,  that the provisions of Section 10.04 shall apply in
all events. In the event any of said Bonds are not to


                                       51

<PAGE>



be redeemed within the next succeeding sixty (60) days, the Authority shall have
given the Trustee in form satisfactory to it irrevocable  instructions for it to
mail,  as soon as  practicable  in the same manner as a notice of  redemption is
mailed pursuant to Article IV hereof,  a notice to the Holders of such Bonds and
to the  Securities  Depositories  and an  Information  Service  that the deposit
required  above has been made with the Trustee and that said Bonds are deemed to
have been paid in  accordance  with this Section 10.02 and stating such maturity
or redemption dates upon which moneys are to be available for the payment of the
principal or redemption price, as applicable, of said Bonds.

     SECTION  10.03.  Deposit of Money or Securities  with Trustee.  Whenever in
this  Indenture it is provided or permitted that there be deposited with or held
in trust by the Trustee money or  securities  in the necessary  amount to pay or
redeem any Bonds, the money or securities so to be deposited or held may include
money or  securities  held by the Trustee in the funds and accounts  established
pursuant to this  Indenture  (exclusive of the Project Fund,  the Purchase Fund,
the Letter of Credit Account and the Rebate Fund) and shall be--

     (A)  Available  Moneys in an amount equal to the  principal  amount of such
Bonds, all unpaid interest  thereon to maturity,  and the purchase price of such
Bonds  except  that,  in the case of Bonds  which  are to be  redeemed  prior to
maturity and in respect of which notice of such redemption shall have been given
as in Article IV provided or provision  satisfactory  to the Trustee  shall have
been made for the  giving of such  notice,  the amount to be  deposited  or held
shall be the redemption  price of such Bonds and all unpaid interest  thereon to
the redemption date; or

     (B) Government  Obligations  purchased with Available Moneys which when due
will provide  money  sufficient to pay the  principal or  redemption  price,  as
applicable,  of, all unpaid interest to maturity,  or to the redemption date, as
the case may be,  on the Bonds to be paid or  redeemed,  as such  principal  and
interest become due, and the purchase price of such Bonds; provided that, in the
case of Bonds which are to be redeemed prior to the maturity thereof,  notice of
such  redemption  shall have been given as provided  in Article IV or  provision
satisfactory  to the Trustee shall have been made for the giving of such notice;
and  provided  further that  investment  securities  purchased  pursuant to this
paragraph shall not be subject to redemption  prior to their maturity other than
at the option of the holder  thereof  unless the moneys to be available from the
redemption of such  securities on the earliest date on which such securities are
subject to redemption,  other than at the option of the holder thereof, shall be
at least equal to the amount of money expected to be derived in connection  with
such  securities in determining  that the provisions of this paragraph have been
satisfied;

provided, in each case, that the Trustee shall have been irrevocably  instructed
(by the terms of this  Indenture or by Request of the  Authority)  to apply such
money to the payment of such principal or redemption  price, as applicable,  and
interest with respect to such Bonds.

     SECTION  10.04.  Payments After  Discharge of Indenture.  When there are no
longer any Bonds Outstanding, and all fees, charges and expenses of the Trustee,
the Tender Agent and any Paying  Agents have been paid or provided  for, and all
expenses of the Authority  relating to the Project and this  Indenture have been
paid or provided  for, and all other  amounts  payable  hereunder  and under the
Agreement have been paid, and this Indenture has been  discharged and satisfied,
and subject to the escheat laws of the State,  the Trustee  shall pay any moneys
remaining in any fund  established and held hereunder (other than moneys held in
the Rebate Fund which shall  continue to be applied as provided in Section 5.07)
in the following  order (1) first,  to the Bank to the extent of any amounts due
to the Bank pursuant to the  Reimbursement  Agreement,  and (2) otherwise to the
Borrower, provided that moneys in


                                       52

<PAGE>



the Letter of Credit Account,  the Liquidity Account and the Remarketing Account
shall be returned to the Bank.


                                   ARTICLE XI

                                  MISCELLANEOUS

     SECTION 11.01. Liability of Authority Limited to Revenues.  Notwithstanding
anything in this Indenture or in the Bonds contained, the Authority shall not be
required to advance any moneys  derived  from any source other than the Revenues
and other assets  pledged  under this  Indenture for any of the purposes in this
Indenture mentioned,  whether for the payment of the principal of or interest on
the  Bonds  or for any  other  purpose  of  this  Indenture.  Nevertheless,  the
Authority  may,  but shall not be required  to,  advance for any of the purposes
hereof any funds of the  Authority  which may be made  available  to it for such
purposes.

     SECTION  11.02.   Successor  Is  Deemed   Included  in  All  References  to
Predecessor.  Whenever in this Indenture  either the Authority or the Trustee is
named or referred to, such  reference  shall be deemed to include the successors
or assigns  thereof,  and all the  covenants and  agreements  in this  Indenture
contained by or on behalf of the  Authority or the Trustee  shall bind and inure
to the  benefit of the  respective  successors  and assigns  thereof  whether so
expressed or not.

     SECTION 11.03. Limitation of Rights to Parties and Bondholders.  Nothing in
this  Indenture  or in the Bonds  expressed  or implied is  intended or shall be
construed to give to any Person other than the Authority, the Trustee, the Bank,
the Borrower and the Holders of the Bonds, any legal or equitable right,  remedy
or claim under or in respect of this  Indenture  or any  covenant,  condition or
provision  therein or herein contained;  and all such covenants,  conditions and
provisions are and shall be held to be for the sole and exclusive benefit of the
Authority, the Trustee, the Bank, the Borrower and the Holders of the Bonds.

     SECTION 11.04.  Waiver of Notice.  Whenever in this Indenture the giving of
notice by mail or otherwise is required, the giving of such notice may be waived
in writing by the person  entitled  to receive  such notice and in any such case
the giving or receipt of such notice  shall not be a condition  precedent to the
validity of any action taken in reliance upon such waiver.

     SECTION 11.05.  Destruction of Bonds.  Whenever in this Indenture provision
is made for the cancellation by the Trustee and the delivery to the Authority of
any Bonds,  the Trustee  may,  upon  Request of the  Authority,  in lieu of such
cancellation and delivery,  destroy such Bonds (in the presence of an officer of
the Authority,  if the Authority shall so require), and deliver a certificate of
such destruction to the Authority.

     SECTION 11.06.  Severability of Invalid  Provisions.  If any one or more of
the provisions  contained in this Indenture or in the Bonds shall for any reason
be held to be  invalid,  illegal  or  unenforceable  in any  respect,  then such
provision or provisions shall be deemed severable from the remaining  provisions
contained in this Indenture and such invalidity,  illegality or unenforceability
shall not affect any other provision of this Indenture, and this Indenture shall
be construed as if such invalid or illegal or unenforceable  provision had never
been contained herein.  The Authority hereby declares that it would have entered
into this  Indenture  and each and every  other  Section,  paragraph,  sentence,
clause or phrase  hereof  and  authorized  the  issuance  of the Bonds  pursuant
thereto irrespective of the fact


                                       53

<PAGE>



that any one or more Sections, paragraphs, sentences, clauses or phrases of this
Indenture may be held illegal, invalid or unenforceable.

     SECTION 11.07.  Governing Law. This Indenture shall be governed exclusively
by and  construed  in  accordance  with the  applicable  laws of the  State  for
contracts executed and delivered,  and to be completely performed,  in the State
without giving effect to conflicts of law provisions.

     SECTION 11.08.  Notices.  If a Bondholder delivers a written request to the
Trustee  setting  forth the  appropriate  telex or  telecopier  number and other
necessary  information  to enable  the  Trustee  to  deliver  notices  by telex,
telegram,   telecopier  or  other  telecommunication  device  notices  shall  be
delivered to such Bondholder in the manner requested  unless otherwise  provided
herein and  confirmed in writing as soon as  practicable.  In all other  events,
notices  shall be delivered to each  Bondholder  by  first-class  mail,  postage
prepaid,  at the address set forth for such Bondholder on the registration books
required to be maintained by the Bond Registrar pursuant to Section 2.07 hereof.
Any notice to or demand upon the Trustee  may be served or  presented,  and such
demand may be made,  at the principal  corporate  trust office of the Trustee in
San  Francisco,  California,  which at the date of adoption of this Indenture is
located at the address set forth below or at such other address as may have been
filed in writing by the Trustee with the Authority. Any notice to or demand upon
the Authority, the Borrower, the Remarketing Agent, the Tender Agent or the Bank
shall be deemed to have been  sufficiently  given or served for all  purposes by
being delivered or sent by telex or by being deposited,  postage  prepaid,  in a
post office letter box, addressed,  as the case may be, as set forth below or at
such other addresses as may have been filed in writing with the Trustee.

           If to the Authority:

                    California Economic Development Financing Authority
                    c/o California Trade and Commerce Agency
                    801 K Street, Suite 1700
                    Sacramento, California 95814
                    Attention: Chair
                    (916) 323-8022  Fax: (916) 322-7214

           If to the Borrower:

                    Advanced Aerodynamics and Structures, Inc.
                    3501 Lakewood Boulevard
                    Long Beach, California 90808
                    Attention: President
                    (562) 938-8618  Fax:  (562) 938-8620

           If to the Trustee:

                    First Trust of California, National Association
                    One California Street
                    4th Floor
                    San Francisco, California  94111
                    Attention:  Municipal Trusts and Agency
                    (415) 273-4500  Fax: (415) 273-4590




                                       54

<PAGE>



           If to the Tender Agent:

                    First Trust of California, National Association
                    One California Street
                    4th Floor
                    San Francisco, California  94111
                    Attention:  Municipal Trusts and Agency
                    (415) 273-4500  Fax: (415) 273-4590

           If to the Bank:

                    The Sumitomo Bank, Limited
                    777 South Figueroa Street, Suite 2600
                    Los Angeles, California  90017
                    Attention: Structured Finance & Financial Institutions Group
                    (213) 955-0800  Fax:  (213) 623-6832

           If to the Remarketing Agent:

                    Rauscher Pierce Refsnes, Inc.
                    2711 North Haskell Avenue, Suite 2400
                    Dallas, Texas 75204
                    Attention:  Fixed Income Banking
                    (214) 989-1000  Fax: (214) 989-1842

           If to DTC:

                    Notices  required to be given under this Indenture to DTC by
                    facsimile   transmission   shall  be  sent  to  DTC's   Call
                    Notification   Department   at  (516)  227-  4039  or  (516)
                    227-4190. Notices to DTC by mail or any other means shall be
                    sent to:

                    The Depository Trust Company
                    711 Stewart Avenue
                    Garden City, NY  11530
                    Attention:   Call Notification Department
                                 Muni Reorganization Manager

     SECTION 11.09. Evidence of Rights of Bondholders.  Any request,  consent or
other  instrument  required  or  permitted  by this  Indenture  to be signed and
executed  by  Bondholders  may be in any  number of  concurrent  instruments  of
substantially  similar tenor and shall be signed or executed by such Bondholders
in person or by an agent or  agents  duly  appointed  in  writing.  Proof of the
execution  of any such  request,  consent  or other  instrument  or of a writing
appointing any such agent, or of the holding by any person of Bonds transferable
by delivery,  shall be sufficient for any purpose of this Indenture and shall be
conclusive  in favor of the Trustee and of the  Authority  if made in the manner
provided in this Section.

     The fact and  date of the  execution  by any  person  of any such  request,
consent or other  instrument or writing may be proved by the  certificate of any
notary  public or other  officer  of any  jurisdiction,  authorized  by the laws
thereof to take acknowledgments of deeds, certifying that the person


                                       55

<PAGE>



signing such request,  consent or other  instrument  acknowledged to such notary
public or other officer the execution  thereof,  or by an affidavit of a witness
of such execution duly sworn to before such notary public or other officer.

     The ownership of registered Bonds shall be proved by the bond  registration
books held by the Bond Registrar.

     Any request,  consent,  or other instrument or writing of the Holder of any
Bond  shall bind  every  future  Holder of the same Bond and the Holder of every
Bond issued in exchange therefor or in lieu thereof, in respect of anything done
or suffered to be done by the Trustee or the Authority in  accordance  therewith
or reliance thereon.

     SECTION 11.10.  Disqualified  Bonds. In determining  whether the Holders of
the requisite  aggregate principal amount of Bonds have concurred in any demand,
request,  direction,  consent or waiver  under this  Indenture,  Bonds which are
owned or held by or for the account of the Authority or the Borrower,  or by any
other obligor on the Bonds, or by any person directly or indirectly  controlling
or controlled by, or under direct or indirect common control with, the Authority
or the  Borrower or any other  obligor on the Bonds,  shall be  disregarded  and
deemed not to be Outstanding for the purpose of any such determination. Bonds so
owned which have been pledged in good faith may be regarded as  Outstanding  for
the purposes of this Section if the pledgee shall establish to the  satisfaction
of the  Trustee the  pledgee's  right to vote such Bonds and that the pledgee is
not a person  directly or  indirectly  controlling  or  controlled  by, or under
direct or indirect  common  control  with,  the Authority or the Borrower or any
other obligor on the Bonds. In case of a dispute as to such right,  any decision
by the Trustee taken upon the advice of counsel shall be full  protection to the
Trustee.

     SECTION 11.11. Money Held for Particular Bonds.

     (A)  The  money  held  by the  Trustee  for the  payment  of the  interest,
principal,  or  premium  due on any date with  respect to  particular  Bonds (or
portions  of Bonds in the case of Bonds  redeemed  in part only)  shall,  on and
after such date and pending such payment,  be set aside on its books and held in
trust by it for the Holders of the Bonds entitled thereto, (subject, however, to
the  provisions  of  Section  10.04) for a period of two years but  without  any
liability for interest thereon.

     (B) Upon the  expiration of the period  specified in subsection  (A) above,
except as provided in subsection (C) below,  funds held by the Trustee  pursuant
to this Indenture shall be paid,  subject to any prior payments  pursuant to the
provisions of Section 10.04, to the Borrower, and funds held by the Tender Agent
shall be paid to the Trustee and thereafter  paid,  subject to the provisions of
Section 10.04, to the Borrower,  upon direction of an Authorized  Representative
of the Borrower,  and thereafter  Bondholders  shall be entitled to look only to
the Borrower for payment, and then only to the extent of the amount so deposited
with the  Borrower,  and all  liability  of the  Authority  or the Trustee  with
respect to such money  shall  thereupon  cease,  and the  Borrower  shall not be
liable for any  interest  thereon and shall not be regarded as a trustee of such
money.

     (C) Any moneys held by the Trustee or the Tender Agent, as the case may be,
in the Letter of Credit Account or the Liquidity  Account for the payment of the
principal, premium, or purchase price of any Bonds not so applied to the payment
of the Bonds within two years after the date on which the same shall have become
due  shall be  transferred  to the  Bank.  Upon  the  expiration  of the  period
specified  in  subsection  (A)  above,  any  moneys  held  by the  Tender  Agent
representing  the proceeds of the remarketing of the Bonds but which were not so
applied  to the  payment of Bonds  shall be  transferred  to the Bank.  All such
moneys  shall be subject to  escheat  to the State in  accordance  with the laws
thereof.


                                       56

<PAGE>



Bondholders  shall be entitled  to look only to the Bank for  payment  from such
moneys, and all liability of the Authority, the Trustee or the Tender Agent with
respect to such money shall thereupon cease, and the Trustee,  the Tender Agent,
the  Authority,  the Bank, or the Borrower  shall not be liable for any interest
thereon and such parties shall not be regarded as a trustee of such money.

     SECTION  11.12.  Funds and Accounts.  Any fund or account  required by this
Indenture to be established and maintained by the Trustee may be established and
maintained  in the  accounting  records of the  Trustee,  either as a fund or an
account,  and may, for the purposes of such records,  any audits thereof and any
reports or statements with respect thereto, be treated either as a fund or as an
account;  but all such records with respect to all such funds and accounts shall
at all times be maintained in accordance with generally accepted corporate trust
industry  standards,  to the  extent  practicable,  and with due  regard for the
requirements of Section 6.05 and for the protection of the security of the Bonds
and the rights of every Holder thereof and the Bank's interest created herein.

     SECTION 11.13. Waiver of Personal Liability.  No member,  officer, agent or
employee of the Authority  shall be  individually  or personally  liable for the
payment of the principal of or premium or interest on the Bonds or be subject to
any personal liability or accountability by reason of the issuance thereof;  but
nothing  herein  contained  shall  relieve any such  member,  officer,  agent or
employee  from the  performance  of any official duty provided by law or by this
Indenture.

     SECTION  11.14.  Execution in Several  Counterparts.  This Indenture may be
executed in any number of counterparts and each of such  counterparts  shall for
all purposes be deemed to be an original; and all such counterparts,  or as many
of them as the  Authority  and the Trustee  shall  preserve  undestroyed,  shall
together constitute but one and the same instrument.

     SECTION 11.15. Actions Due on Saturdays,  Sundays and Holidays. If any date
on which a payment,  notice or other action  required by this Indenture falls on
other than a Business Day, then that action or payment need not be taken or made
on such date, but may be taken or made on the next succeeding  Business Day with
the same force and effect as if made on such date.

     SECTION 11.16. References to Bank. Notwithstanding any provisions contained
herein to the  contrary,  the Bank shall be  entitled  to take all  actions  and
exercise  all rights  hereunder  for its own account so long as the Bank has not
wrongfully  dishonored  any drawings  under the Letter of Credit and the Bank is
not in liquidation, bankruptcy or receivership proceedings. After the expiration
or  termination  of the Letter of Credit and after all  obligations  owed to the
Bank  pursuant  to the  Reimbursement  Agreement  have  been  paid  in  full  or
discharged,  all references to the Bank contained  herein (other than in Section
10.04) shall be null and void and of no further force and effect.

                         [End of the Indenture of Trust]



                                       57

<PAGE>



     IN WITNESS WHEREOF, the CALIFORNIA ECONOMIC DEVELOPMENT FINANCING AUTHORITY
has caused this Indenture to be signed in its name by the Chair of the Authority
and  attested  by  its  Secretary  and  FIRST  TRUST  OF  CALIFORNIA,   NATIONAL
ASSOCIATION,  in token of its  acceptance of the trusts created  hereunder,  has
caused  this  Indenture  to be  signed  in its  corporate  name by its  officers
thereunto duly authorized, all as of the day and year first above written.

                                     CALIFORNIA ECONOMIC DEVELOPMENT
                                     FINANCING AUTHORITY


                                     By
                                           Chair


Attest


By
     Secretary



APPROVED AS TO FORM


By
      Counsel


                                       FIRST TRUST OF CALIFORNIA,
                                       NATIONAL ASSOCIATION,
                                       as Trustee


                                        By
                                            Authorized Officer



Attest


By
   Assistant Secretary



<PAGE>



                                    EXHIBIT A

                                  FORM OF BOND

     NEITHER THE STATE OF CALIFORNIA NOR ANY POLITICAL  SUBDIVISION OR AGENCY OF
     THE STATE OF CALIFORNIA SHALL BE OBLIGATED TO PAY THIS BOND OR THE INTEREST
     HEREON.  NEITHER THE FAITH AND CREDIT NOR THE TAXING  POWER OF THE STATE OF
     CALIFORNIA OR ANY POLITICAL SUBDIVISION OR AGENCY THEREOF IS PLEDGED TO THE
     PAYMENT  OF THE  PRINCIPAL  OF,  PREMIUM,  IF ANY,  PURCHASE  PRICE  OF, OR
     INTEREST ON, THIS BOND.  NEITHER THE STATE OF CALIFORNIA  NOR ANY POLITICAL
     SUBDIVISION OR AGENCY OF THE STATE OF CALIFORNIA IS IN ANY MANNER OBLIGATED
     TO MAKE ANY  APPROPRIATION  FOR SUCH PAYMENTS.  THE AUTHORITY HAS NO TAXING
     POWER.  THIS BOND,  TOGETHER  WITH THE INTEREST AND PREMIUM (IF ANY) HEREON
     AND THE PURCHASE PRICE HEREOF,  SHALL NOT BE DEEMED TO CONSTITUTE A DEBT OR
     LIABILITY OF THE STATE OF CALIFORNIA OR ANY POLITICAL SUBDIVISION OR AGENCY
     OF THE STATE OF CALIFORNIA.


No.  R-1                                                             $8,500,000

               CALIFORNIA ECONOMIC DEVELOPMENT FINANCING AUTHORITY
                              VARIABLE RATE DEMAND
                INDUSTRIAL DEVELOPMENT REVENUE BOND, SERIES 1997
              (ADVANCED AERODYNAMICS AND STRUCTURES, INC. PROJECT)


MATURITY DATE            ORIGINAL ISSUE DATE              CUSIP

August 1, 2027           August 5, 1997                  13066P AM0

Registered Owner:        CEDE & CO.

Principal Sum:  EIGHT MILLION FIVE HUNDRED THOUSAND DOLLARS

     The CALIFORNIA ECONOMIC DEVELOPMENT  FINANCING AUTHORITY (the "Authority"),
a body  public  and  corporate,  and a public  instrumentality  of the  State of
California  (the  "State"),  duly  organized and existing  under the laws of the
State,  particularly  Part  10.2 of  Division  3 of  Title  2 of the  California
Government  Code  (commencing  with Section 15710 of the  California  Government
Code), as amended (the "Act"), for value received, hereby promises to pay to the
registered  owner specified above, or registered  assigns,  on the maturity date
set  forth  above  (subject  to  any  right  of  prior  redemption   hereinafter
mentioned),  the  principal  sum set forth above,  in lawful money of the United
States of America,  and to pay  interest  thereon in like lawful  money from and
including the Interest  Payment Date (as defined herein) next preceding the date
of registration of this Bond (unless this Bond is registered after a Record Date
(as hereinafter  defined) and on or before the next succeeding  Interest Payment
Date or on an Interest  Payment Date, in which event it shall bear interest from
and including


                                       A-1

<PAGE>



such  Interest  Payment  Date,  or unless this Bond is registered on or prior to
September 1, 1997,  in which event it shall bear interest from and including the
date of initial  issuance and delivery (the "Date of Delivery")),  until payment
of such  principal  sum shall be  discharged  as provided in the  Indenture  (as
hereinafter  defined), at the rates per annum determined as set forth below. The
interest on this Bond will be payable on September 2, 1997,  and  thereafter  on
the first  Business Day of each month on or prior to the date on which this Bond
is converted to bear a fixed rate of interest as provided in the Indenture  (the
"Fixed Rate Date"), and thereafter on August 1 and February 1 in each year (each
such date being referred to herein as an "Interest Payment Date"). The principal
(or  redemption  price)  hereof  is  payable  upon  presentation  hereof  at the
principal  corporate  trust  office  of  First  Trust  of  California,  National
Association  (together  with any successor as trustee under the  Indenture,  the
"Trustee"), in San Francisco, California, or at such other office as the Trustee
may designate.  Interest  hereon is payable by check or draft mailed,  except as
provided  in the  Indenture,  to the  person  whose  name  appears  on the  bond
registration books of the Trustee as the registered owner hereof as of the close
of business on the Record Date,  in each case,  at such  person's  address as it
appears on such registration  books. The term "Record Date" means,  prior to the
Fixed Rate Date, the Business Day preceding any Interest Payment Date, and after
the Fixed Rate Date, the fifteenth  (15th) day of the calendar  month  preceding
any Interest Payment Date.

     The Authority, First Trust of California,  National Association,  as tender
agent (the "Tender Agent"),  the Trustee, any paying agent, and any agent of the
Authority,  the Tender  Agent or the  Trustee may treat the person in whose name
this Bond is registered as the owner hereof for the purpose of receiving payment
as herein  provided and for all other  purposes,  and the Authority,  the Tender
Agent, the Trustee,  any paying agent or any such agent shall not be affected by
notice to the contrary.

     This Bond, together with the interest and premium (if any) hereon shall not
be deemed  to  constitute  a debt or  liability  of the  State or any  political
subdivision  or agency  of the State or a pledge of the faith and  credit of the
State or any political  subdivision or agency of the State, but shall be payable
solely from the funds provided therefor pursuant to the Indenture.  This Bond is
only a special,  limited  obligation of the Authority as provided by the Act and
the Authority shall under no circumstances be obligated to pay the principal of,
premium,  if any,  purchase  price of, or interest on this Bond,  or other costs
incident hereto except from the revenues and funds pledged therefor  pursuant to
the Indenture.  Neither the State nor any political subdivision or agency of the
State is in any manner  obligated to make any  appropriation  for such payments.
The Authority has no taxing power.

     No member or officer of the Authority,  nor any person  executing this Bond
shall in any event be subject to any  personal  liability or  accountability  by
reason of the issuance of this Bond.

     This  Bond is one of a duly  authorized  issue of  bonds  of the  Authority
designated as captioned  above (the "Bonds")  pursuant to the  provisions of the
Act, and pursuant to an indenture of trust,  dated as of August 1, 1997, between
the  Authority and the Trustee (the  "Indenture").  The Bonds are issued for the
purpose  of making a loan to  Advanced  Aerodynamics  and  Structures,  Inc.,  a
corporation  duly organized and existing under the laws of the State of Delaware
(the  "Borrower"),  to assist  in the  financing  of a Project  (as such term is
defined in the Indenture)  owned by the Borrower,  pursuant to a loan agreement,
dated as of  August  1,  1997,  between  the  Authority  and the  Borrower  (the
"Agreement"),  for the  purposes  and on the  terms  and  conditions  set  forth
therein.  The payment of principal of and interest on the Bonds is secured by an
irrevocable  Letter  of Credit  issued by The  Sumitomo  Bank,  Limited,  acting
through its Los Angeles Branch, (the "Letter of Credit" and the "Bank",


                                       A-2

<PAGE>



respectively).  Such Letter of Credit may be renewed or  substituted by a letter
of credit of another  financial  institution or an alternate  credit facility as
provided in the Agreement and the Indenture.

     Reference  is hereby made to the  Indenture  (a copy of which is on file at
said office of the Trustee) and all indentures  supplemental  thereto and to the
Act for a description of the rights  thereunder of the registered  owners of the
Bonds,  of the nature  and extent of the  security,  of the  rights,  duties and
immunities of the Trustee and the Tender Agent and of the rights and obligations
of the  Authority  thereunder,  to all the  provisions  of which  Indenture  the
registered owner of this Bond, by acceptance hereof, assents and agrees.

     The Bonds and the  interest  thereon are payable  solely from  Revenues (as
defined in the  Indenture)  and are secured by a pledge of said  Revenues and of
amounts  held in the funds  (except as provided in the  Indenture)  and accounts
established  pursuant to the  Indenture  (including  proceeds of the sale of the
Bonds),  subject  only  to  the  provisions  of  the  Indenture  permitting  the
application  thereof for the purposes and on the terms and  conditions set forth
in the Indenture.  The Bonds are further  secured by an assignment of the right,
title and interest of the  Authority in the Agreement (to the extent and as more
particularly described in the Indenture) and by the Letter of Credit.

     The Bonds shall bear  interest  from and  including the Date of Delivery of
the  Bonds  to and  including  a date  specified  in the  Indenture  at the rate
specified in the  Indenture.  Thereafter,  prior to the Fixed Rate Date or final
maturity date, whichever is earlier,  the Bonds shall bear interest,  calculated
on the basis of a year of 365 or 366 days, as  appropriate,  at a rate per annum
equal to the Weekly Interest Rate (as hereinafter defined). Each period from and
including  the  Date  of  Delivery  to and  including  September  1,  1997  and,
thereafter,  the period  from and  including  an  Interest  Payment  Date to and
including the day next preceding the  immediately  succeeding  Interest  Payment
Date is herein called an "Interest Period."

     The Weekly  Interest Rate shall be the rate  determined by Rauscher  Pierce
Refsnes,  Inc.  (together  with any  successor  as  Remarketing  Agent under the
Indenture,  the  "Remarketing  Agent"),  on  the  basis  of the  examination  of
Tax-exempt  (as defined in the  Indenture)  obligations  comparable to the Bonds
known  by the  Remarketing  Agent to have  been  priced  or  traded  under  then
prevailing market conditions, to be the minimum interest rate which, if borne by
the Bonds, would enable the Remarketing Agent to sell the Bonds on the date such
interest rate becomes effective at a price equal to the principal amount thereof
plus accrued  interest,  if any, but in no event exceeding twelve percent (12%);
provided,  however,  that if for any reason a Weekly Interest Rate so determined
shall be held to be  invalid  or  unenforceable  by a court of law,  the  Weekly
Interest Rate shall be the rate established in accordance with the Indenture.

     The  Remarketing  Agent shall  determine the Weekly Interest Rate as of the
close of  business  on Tuesday in each  calendar  week until the  earlier of the
Fixed Rate Date,  or payment in full of the Bonds;  provided  that if Tuesday in
any calendar week shall not be a Business Day then such  determination  shall be
made on the next preceding  Business Day, and  communicate by telephonic  notice
such rate to the Trustee  (with  prompt  confirmation  in  writing).  The Weekly
Interest  Rate so  determined  shall become  effective  Wednesday in the week of
determination  thereof,  to and including the following Tuesday  irrespective of
when the rate was determined by the Remarketing  Agent. If the Remarketing Agent
shall fail to determine a new Weekly  Interest Rate in any week,  the previously
effective  Weekly  Interest Rate shall remain in effect for the next  succeeding
week and shall thereafter be determined in accordance with the Indenture.



                                       A-3

<PAGE>



     Each  determination  of the Weekly Interest Rate by the  Remarketing  Agent
shall be conclusive and binding on the owners of the Bonds.

     Anything  herein  to the  contrary  notwithstanding,  in no  event  may the
interest  rate borne by the Bonds exceed  twelve  percent (12%) per annum or, if
lower,  the maximum rate of interest which may be charged or collected  pursuant
to applicable provisions of federal or state law.

     On any  Interest  Payment  Date,  the  interest  rate on the  Bonds  may be
converted to a fixed annual rate of interest  (the "Fixed  Interest  Rate") upon
receipt  by the  Authority,  the  Trustee,  the Tender  Agent,  the Bank and the
Remarketing  Agent  not less  than 45 days in  advance  of the date on which the
Bonds begin to bear interest at the Fixed  Interest Rate (the "Fixed Rate Date")
of (i) notice from the Borrower  electing to have the interest rate on the Bonds
converted  to a Fixed  Interest  Rate,  (ii) an opinion  of Bond  Counsel to the
effect that  conversion  to a Fixed  Interest Rate is permitted by the Indenture
and the Act and that  conversion to the Fixed  Interest Rate in accordance  with
the  provisions of the Indenture  will not cause interest on the Bonds to not be
Tax-exempt and (iii)  satisfaction of certain other  conditions set forth in the
Indenture.

     After the Fixed Rate Date,  interest  on the Bonds shall be computed on the
basis of a year of 360 days and 12 months of 30 days each.  The interest rate on
all Bonds from the Fixed Rate Date until the  maturity  or prior  redemption  or
acceleration thereof shall be a rate per annum equal to the Fixed Interest Rate,
which shall be  determined  as follows on or prior to, but not more than 15 days
prior to, the  Business  Day  immediately  preceding  the Fixed  Rate Date.  The
Remarketing Agent shall specify the Fixed Interest Rate to be borne by the Bonds
on and after the Fixed Rate Date.

     The Fixed  Interest  Rate shall be the rate,  but not  exceeding  the rate,
which at the time of  determination  thereof in the judgment of the  Remarketing
Agent,  having due regard for prevailing  financial market conditions,  would be
necessary to remarket the Bonds at a price equal to 100% of the principal amount
thereof  on  the  Fixed  Rate  Date.  If on the  date  of  determination  by the
Remarketing  Agent of the  Fixed  Interest  Rate,  the  Fixed  Interest  Rate so
determined  is held by a court to be  invalid or  unenforceable,  then the Fixed
Interest Rate shall be a rate determined by the Remarketing Agent, not less than
90% or more than 130% of the  "Alternate  Fixed  Rate," which in the judgment of
the Remarketing Agent, having due regard for prevailing market conditions, would
be the minimum rate at which owners of the Bonds would be able to sell the Bonds
at a price equal to the  principal  amount  thereof on the Fixed Rate Date.  The
Alternate Fixed Rate shall be determined by the Remarketing Agent and shall be a
rate per annum  based upon yield  evaluations  at par of  Tax-exempt  securities
having a remaining term equal, as nearly as  practicable,  to the time remaining
until the  maturity  of the Bonds of not less than  five  Component  Issues  (as
defined in the Indenture)  selected by the Remarketing Agent each of which would
be rated by either Moody's Investors Service,  Inc. or Standard & Poor's Ratings
Group  in a  long-term  debt  rating  category  which  is  the  same  as,  or is
immediately  proximate  to, the  long-term  debt rating  category  which will be
assigned to the Bonds after the Fixed Rate Date. Anything to the contrary herein
notwithstanding,  the Fixed  Interest Rate shall not exceed twelve percent (12%)
per annum. If, after the Fixed Rate Date the Bonds shall fail to be converted to
a Fixed  Interest  Rate,  the Bonds will continue to earn interest at the Weekly
Interest Rate as provided in the Indenture  and the  registered  owners shall be
notified thereof.

     At least thirty (30) days prior to the Fixed Rate Date,  the Trustee  shall
give an irrevocable  notice to the registered owners of conversion of the Weekly
Interest Rate borne by the Bonds to the Fixed Interest  Rate.  Such notice shall
(i) specify the  proposed  Fixed Rate Date,  (ii)  require  owners of all of the
Outstanding  Bonds to tender their Bonds for purchase on the Fixed Rate Date and
(iii) state


                                       A-4

<PAGE>



that all  Outstanding  Bonds  not  purchased  on or before  the Fixed  Rate Date
pursuant to the Indenture  will be deemed to be purchased on the Fixed Rate Date
at a price equal to the principal amount thereof,  plus unpaid interest, if any,
accrued to such date.

     Any Bond purchased by the Tender Agent from the date notice of the proposed
Fixed Rate Date is given to registered  owners through the Fixed Rate Date shall
be remarketed  at the Weekly  Interest Rate for a period up to and including the
Fixed Rate Date;  provided,  however,  that all Bonds  remarketed  from the date
notice of the  proposed  Fixed Rate Date is given to an owner  through the Fixed
Rate Date shall be tendered by the owner thereof on the Fixed Rate Date pursuant
to the provisions of the Indenture.

     The Bonds are also subject to mandatory  tender for purchase on the date an
alternate  letter of credit is substituted for the Letter of Credit (the "Letter
of Credit  Substitution  Date").  The Fixed  Rate Date and the  Letter of Credit
Substitution Date are also referred to as the "Mandatory Tender Date."

     All Bonds which on the  Mandatory  Tender Date have not been  tendered  for
purchase  ("Non-Tendered  Bonds"), shall be deemed purchased by the Tender Agent
on the  Mandatory  Tender Date at a price of the principal  amount  thereof plus
unpaid  interest,  if any,  accrued  to such  date.  Replacement  bonds  for the
Non-Tendered  Bonds may be remarketed  and delivered to new owners as instructed
by the Borrower or the Remarketing  Agent. The Tender Agent shall hold in escrow
for the owners of the Non-Tendered  Bonds the purchase price thereof,  and after
the  Mandatory  Tender Date such owners will no longer be entitled to any of the
benefits of the Indenture except for the payment of such purchase price.

     The Indenture  provides that prior to the Fixed Rate Date, the Bonds may be
delivered by the owners  thereof to the Tender Agent at its principal  corporate
trust office in San  Francisco,  California or at such other place as the Tender
Agent may  designate  in writing to the owners.  Any Bond so delivered or notice
with  respect to which is received  shall be  purchased  by the Tender  Agent on
demand of the owner thereof on the close of any Business Day at a purchase price
equal to the principal amount thereof plus accrued interest to but not including
the date of purchase  (unless such date is an Interest  Payment  Date,  in which
case the purchase price will be the principal amount of such Bond) upon:

     (A) delivery to the Tender Agent of an  irrevocable  written notice by 4:00
p.m.,  California  time, which states (i) the name and address of the registered
owner,  (ii) the number or numbers of the Bond or Bonds to be  purchased,  (iii)
the aggregate  principal  amount of the Bond or Bonds to be purchased,  and (iv)
the date on which the Bond is or Bonds are to be purchased,  which date shall be
a Business Day not prior to the seventh (7th)  calendar day next  succeeding the
date of delivery of such notice; and

     (B)  delivery  to the Tender  Agent at or prior to 10:00  a.m.,  California
time, on the Purchase Date  specified in the  aforesaid  notice,  of the Bond or
Bonds to be tendered; provided, however, that any Bond for which a notice of the
exercise of the  purchase  option has been given as provided in  subsection  (A)
above and which is not so  delivered  shall be deemed  delivered  on the date of
purchase and shall be purchased in accordance with the Indenture.

The Bonds are subject to redemption by the Authority upon the following terms in
increments of $5,000,  provided that in the event of redemption of less than all
of the Bonds,  the  amount  which  remains  outstanding  shall be in  Authorized
Denominations (as defined in the Indenture):



                                       A-5

<PAGE>



          (i) The Bonds are not subject to sinking fund redemption.

          (ii) On or prior to the Fixed  Rate  Date,  the Bonds are  subject  to
redemption  on any Interest  Payment Date, in whole or in part, to the extent of
prepayments  of  amounts  due  under  the  Agreement  made at the  option of the
Borrower,  with the written  approval of the Bank, at a redemption price of 100%
of the principal amount of the Bonds redeemed,  plus interest accrued thereon to
the redemption date.

          (iii)  The  Bonds  Outstanding  on the  date  of the  occurrence  of a
Determination  of Taxability (as defined in the Indenture)  shall be redeemed in
whole, at a price of 100% of the principal  amount thereof plus interest accrued
thereon  to  the  redemption  date,  at any  time  within  60  days  after  such
occurrence.  IF THE LIEN OF THE INDENTURE IS DISCHARGED  PRIOR TO THE OCCURRENCE
OF A  DETERMINATION  OF TAXABILITY  THE BONDS SHALL NOT BE REDEEMED AS DESCRIBED
HEREIN.

          (iv) The Bonds shall be redeemed in whole, at a redemption price equal
to 100% of the principal  amount  thereof plus interest  accrued  thereon to the
redemption  date, on a redemption date not less than fifteen (15) days preceding
the  expiration  date of the  Letter of Credit  selected  by the  Trustee  if no
Alternate  Letter of Credit has been delivered to the Trustee in accordance with
the Agreement.

          (v) The Bonds are subject to  redemption  in whole or in part,  on any
date,  at a  redemption  price  equal to 100% of the  principal  amount of Bonds
redeemed, plus interest accrued thereon to the redemption date, to the extent of
prepayments  of  amounts  due  under  the  Agreement  made at the  option of the
Borrower  following  the  occurrence  of damage to, or the  destruction  of, the
Project,  the taking  thereof under the power of eminent domain or the Agreement
is void unenforceable, impossible of performance or unlawful.

          (vi) After the Fixed Rate Date, the Bonds are subject to redemption to
the extent of  prepayments of amounts due under the Agreement made at the option
of the  Borrower,  with the  consent  of the Bank,  in whole or in part,  on any
Interest  Payment Date during the applicable  periods  specified  below,  at the
applicable  redemption price stated below,  plus interest accrued thereon to the
redemption date:

Number of Years From
Fixed Rate Date to            First Optional                   Redemption
Final Maturity                Redemption Date                  Price

greater than 9 years          7 years from                     102%,
                              conversion                       declining
                                                               1% annually
                                                               to 100%

6-9 years                     6 years from                     101%,
                              conversion                       declining
                                                               1% annually
                                                               to 100%

less than 6 years             no optional
                              redemption




                                       A-6

<PAGE>



Notwithstanding the optional redemption schedule set forth above, on or prior to
the Fixed Rate Date,  the  Remarketing  Agent may provide an alternate  optional
redemption schedule if it obtains an opinion of Bond Counsel that such alternate
schedule will not cause interest on the Bonds not to be Tax-exempt.

          (vii) The Bonds  shall be  redeemed in whole,  at a  redemption  price
equal to 100% of the principal amount thereof,  plus interest accrued thereon to
the  redemption  date,  within five (5) calendar  days (and before the following
Saturday  if the fifth  calendar  day is a  Saturday)  from the date the Trustee
receives  written  notice from the Bank that an event of default has taken place
under the Reimbursement Agreement and directing the Trustee to redeem the Bonds.

          (viii) The Bonds are subject to  redemption,  in part on any  Interest
Payment  Date,  at a  redemption  price  equal to 100% of the  principal  amount
thereof,  plus accrued interest to the redemption date, to the extent of amounts
remaining in the Project Fund upon completion of the Project which are deposited
in the Surplus  Account (as such terms are defined in the Indenture) as provided
in the Indenture.

     If an Event of Default  (as  defined in the  Indenture)  shall  occur,  the
principal of all Bonds may be declared due and payable upon the  conditions,  in
the manner and with the effect provided in the Indenture. The Indenture provides
that in certain events such declaration and its consequences may be rescinded.

     The Bonds  are  issuable  as fully  registered  Bonds  without  coupons  in
denominations  of  $100,000  or any  multiple  of $5,000 in excess of  $100,000,
provided   that  after  the  Fixed  Rate  Date  the  Bonds  will  be  issued  in
denominations  of  $5,000  or  any  integral  multiple  thereof.  This  Bond  is
transferable by the registered  owner hereof,  in person or by his attorney duly
authorized in writing,  but only in the manner,  subject to the  limitations and
upon  payment  of the  charges,  if any,  provided  in the  Indenture,  and upon
surrender and  cancellation  of this Bond.  Upon such transfer a new  registered
Bond or  Bonds,  of  authorized  denomination  or  denominations,  for the  same
aggregate  principal  amount,  will be  issued  to the  transferee  in  exchange
therefor.

     The  Indenture and the rights and  obligations  of the Authority and of the
owners of the Bonds  and of the  Trustee  or  Tender  Agent may be  modified  or
amended  from time to time and at any time (and in  certain  cases  without  the
consent of the owners) in the manner, to the extent, and upon the terms provided
in the  Indenture;  provided that no such  modification  or amendment  shall (i)
extend  the fixed  maturity  of this Bond,  or reduce  the  amount of  principal
hereof, or extend the time of payment or change the method of computing the rate
of interest hereon,  or extend the time of payment of interest  hereon,  without
the consent of the owner hereof, (ii) reduce the percentage of Bonds the consent
of the owners of which is required to effect any such modification or amendment,
or permit the creation of any lien on the  Revenues and other assets  pledged as
security  for the Bonds  prior to or on a parity  with the lien  created  by the
Indenture,  or  deprive  the  owners  of the  Bonds of the lien  created  by the
Indenture on such Revenues and other assets (except as expressly provided in the
Indenture),  without the consent of the owners of all Bonds then outstanding, or
(iii)  adversely  affect the  interests  of the Tender  Agent  without its prior
written  consent.  The  Trustee  shall not be  required  to  consent to any such
amendment which materially  adversely affects its rights,  duties and immunities
under the Indenture or otherwise, all as more fully set forth in the Indenture.

     If moneys or securities  shall have been set aside and held for the payment
or redemption of Bonds and the interest installments therefor to the maturity or
redemption date thereof in accordance


                                       A-7

<PAGE>



with the  Indenture,  such Bonds  shall be deemed to be paid  within the meaning
provided in the Indenture and the pledge of Revenues and other assets made under
the  Indenture  and all  covenants,  agreements  and  other  obligations  of the
Authority  under  the  Indenture  shall  cease,  terminate,  become  void and be
completely discharged and satisfied.

     It is hereby certified and recited that any and all conditions,  things and
acts required to exist, to have happened and to have been performed precedent to
and in the issuance of this Bond do exist, have happened and have been performed
in due time, form and manner as required by the Act, and by the Constitution and
laws of the State,  and that the amount of this  Bond,  together  with all other
indebtedness of the Authority,  does not exceed any limit prescribed by the Act,
or by the Constitution and laws of the State, and is not in excess of the amount
of Bonds permitted to be issued under the Indenture.

     This Bond shall not be  entitled  to any benefit  under the  Indenture,  or
become  valid  or  obligatory  for  any  purpose,   until  the   certificate  of
authentication  and  registration  hereon endorsed shall have been signed by the
Trustee.




                                       A-8

<PAGE>



     IN WITNESS WHEREOF, the California Economic Development Financing Authority
has caused  this Bond to be executed in its name and on its behalf by the manual
or facsimile  signature of the Chair of the Authority and attested by the manual
or facsimile signature of its Secretary, all as of the date set forth above.


                                    CALIFORNIA ECONOMIC DEVELOPMENT
                                    FINANCING AUTHORITY


                                    By
                                            Chair



Attest:



Secretary



                                       A-9

<PAGE>



                 CERTIFICATE OF AUTHENTICATION AND REGISTRATION

     This is one of the Bonds described in the within-mentioned Indenture, which
has been registered on August 5, 1997.

                              FIRST TRUST OF CALIFORNIA,
                              NATIONAL ASSOCIATION,
                              as Trustee


                              By
                                 Authorized Signatory




                                      A-10

<PAGE>


                                   ASSIGNMENT

     For value received the undersigned  do(es) hereby sell, assign and transfer
unto (Insert  name,  address,  zip code and Social  Security,  taxpayer or other
identification  numbers of Assignee) the  within-mentioned  registered  Bond and
hereby irrevocably  constitute(s) and appoint(s) attorney,  to transfer the same
on the  books of the Bond  Registrar  with  full  power of  substitution  in the
premises.

Dated:  

                                        Notice: The signature on this Assignment
                                        must  correspond  with  the  name of the
                                        Registered  Owner as it appears upon the
                                        face  of  the   within   Bond  in  every
                                        particular    without    alteration   or
                                        enlargement or any change whatsoever.


                                        Signature guaranteed:



                                        (NOTE:  Signature  must be guaranteed by
                                        an Eligible Guarantor Institution


                                      A-11



                          IRREVOCABLE LETTER OF CREDIT





Letter of Credit No. G/LA-400557                                 August 5, 1997



First Trust of California, National Association
not individually but solely as Trustee
One California Street, Fourth Floor
San Francisco, California 94111

Attention:  Corporate Trust Department

Ladies and Gentlemen:

         We hereby issue in your favor, not individually,  but solely as Trustee
(the  "Trustee")  under the  Indenture  of Trust dated as of August 1, 1997 (the
"Indenture")  between the California  Economic  Development  Financing Authority
(the  "Issuer")  and you,  this  irrevocable  direct pay letter of credit  (this
"Letter of Credit") in an amount not exceeding $8,625,754 (the "Stated Amount"),
of which an amount not  exceeding  $8,500,000  may be drawn upon with respect to
the  payment of  principal  of the  Issuer's  $8,500,000  Variable  Rate  Demand
Industrial  Development  Revenue Bonds,  Series 1997 (Advanced  Aerodynamics and
Structures, Inc. Project) (the "Bonds") and an amount not exceeding $125,754 may
be drawn upon with respect to the payment of up to forty-five (45) days' accrued
interest  (at the rate of 12% per annum  based on a 365-day  year) on the Bonds,
for payment of your draft, drawn at sight on The Sumitomo Bank, Limited,  acting
through its Los Angeles Branch (the "Bank"),  777 South Figueroa  Street,  Suite
2600, Los Angeles,  California 90017 (or such other address in the United States
of America as may be designated to you in writing from time to time by the Bank)
accompanied   by  your   signed   certificate   (with  the   blanks   filled  in
appropriately):

         1. if the  drawing  is  being  made  with  respect  to the  payment  or
provision for payment of interest on the Bonds,  whether for regularly scheduled
interest  payments  pursuant  to Section  2.02 of the  Indenture  or for accrued
interest  on Bonds  subject to  optional  or  mandatory  redemption  pursuant to
Article IV of the Indenture or upon the  acceleration  of the Bonds  pursuant to
Section 7.01 of the Indenture, your certificate in the form attached as Annex I;

         2. if the  drawing  is  being  made  with  respect  to the  payment  of
principal upon an optional or mandatory  redemption of Bonds pursuant to Article
IV of the  Indenture or upon the maturity of the Bonds  pursuant to Section 2.02
of the Indenture or upon the  acceleration of the Bonds pursuant to Section 7.01
of the Indenture, your certificate in the form attached as Annex II;


                                        1

<PAGE>



         3. if the  drawing is made with  respect to the  payment of the accrued
interest and the principal  portion of the purchase  price of Bonds  tendered or
deemed to have been  tendered  pursuant to Section  4.06 or Section  4.07 of the
Indenture,  your  certificate  in the form attached as Annex III (any such draft
accompanied  by such  signed  certificate  is herein  referred to as a "Purchase
Price Draft").

         More than one demand  for  payment  may be made  under  this  Letter of
Credit.  A demand for  payment  with  respect to the  payment of  interest on or
principal  of the Bonds  shall not exceed  that  portion  of the  Stated  Amount
allocated  to interest  or  principal,  respectively,  as the same is reduced or
reinstated from time to time as provided below.

         The expiration  date of this Letter of Credit (the  "Expiration  Date")
shall be the  earliest  of:  (i) our  close of  business  on August 5, 2002 (the
"Stated Expiration  Date"),  unless the Stated Expiration Date has been extended
and the Stated Amount adjusted (if  appropriate) by an instrument  substantially
in the form of  Attachment C hereto (which forms an integral part of this Letter
of  Credit);  (ii) ten (10) days after you  receive  notice  from the Bank of an
Event of Default under (and as defined in) the Reimbursement Agreement dated as.
of August 1, 1997  between  Advanced  Aerodynamics  and  Structures,  Inc.  (the
"Company") and the Bank (the "Reimbursement Agreement") and a direction to cause
a redemption of all  outstanding  Bonds under the terms of the Indenture;  (iii)
the date on which the Bank,  receives  notice  from you that all Bonds have been
paid in full or such payment has been provided for in accordance  with the terms
of the  Indenture;  (iv)  the date on  which  the  Bonds  become  secured  by an
Alternate  Letter of Credit (as defined in the Indenture) in accordance with the
terms of the Indenture; and (v) the date on which the interest rate on the Bonds
is  converted  to a fixed rate of interest in  accordance  with the terms of the
Indenture.  You  shall  surrender  this  Letter  of  Credit  to the  Bank on the
Expiration Date of this Letter of Credit.

         A draft and completed signed  certificate  (other than a Purchase Price
Draft)  presented prior to 9:00 a.m., Los Angeles,  California  time, on any day
except Saturday, Sunday or any day on which banking institutions located, in the
Cities of New York, New York or Los Angeles, California or the city in which the
principal  office of the  Trustee or the  Remarketing  Agent (as  defined in the
Indenture) is located  (initially,  San Francisco,  California)  are required or
authorized  by law to close or a day on which  the New York  Stock  Exchange  is
closed (a  "Business  Day") shall be honored and the amount of the draft paid in
immediately  available funds by 1:00 p.m., Los Angeles,  California time) on the
same Business Day,  provided  that such draft and signed  certificate  presented
conform  to the terms and  conditions  of this  Letter  of  Credit.  A draft and
completed signed certificate (other than a Purchase Price Draft) presented after
9:00 a.m., Los Angeles, California time on any Business Day shall be honored and
the amount of the draft paid in  immediately  available  funds by 11:00 a.m. Los
Angeles,  California  time,  on the following  Business Day,  provided that such
draft and signed  certificate  presented  conform to the terms and conditions of
this Letter of Credit.  A Purchase Price Draft presented prior to 9:00 a.m., Los
Angeles, California time, on any Business Day shall be honored and the amount of
the  draft  paid in  immediately  available  funds  by 1:00  p.m.  Los  Angeles,
California  time on the same  Business Day,  provided  that such Purchase  Price
Draft presented conforms to the terms and conditions of this Letter of Credit. A
Purchase Price Draft presented after

                                        2

<PAGE>



9:00 a.m., Los Angeles, California time on any Business Day shall be honored and
the amount of the draft paid in immediately  available  funds by 11:00 a.m., Los
Angeles, California time on the following Business Day, provided that such draft
and signed  certificate  presented  conform to the terms and  conditions of this
Letter  of  Credit.  Payment  under  this  Letter  of  Credit  shall  be made in
accordance with the payment instructions set forth in the completed  certificate
accompanying  each  draft.  All  payments  made by the Bank under this Letter of
Credit shall be made from the Bank's own funds without any requirement  that the
Trustee,  the holders of the Bonds or the Bank make any prior claims against the
Company  and not out of any  funds of the  Company,  the  Issuer  or any  entity
related to either of them.  By the time set forth above on the Business Day such
payment is due the Bank shall  enter such  payment  instructions  on the Federal
Reserve  wire or, in the event  such  payment  instructions  specify  an account
maintained with the Bank, credit such account with immediately available funds.

         Any draft or certificate  may be presented in person to the Bank or may
be sent to the Bank by telecopier or other  electronic  communication,  promptly
confirmed  by  telephone  at (213) 955- 0800,  Attention:  Manager -  Structured
Finance and Financial  Institutions Group, to telecopy number (213) 623-6832 (or
such other  telecopy or telephone  number as may be designated to you in writing
from time to time by the  Bank).  Any such  draft or  certificate  presented  by
telecopy or other electronic  communication  shall be mailed or delivered to the
Bank on the same day to our  office  specified  in the first  paragraph  of this
Letter of Credit.

         This Letter of Credit is successively  transferable only to a successor
paying agent upon receipt by the Bank of prior  written  notice of such transfer
in accordance  with Attachment A (which forms an integral part of this Letter of
Credit),  acknowledged by a purported officer of the Trustee and the transferee,
addressed to the Bank and certifying that the transferee is a successor  trustee
under the Indenture.

         Each  payment of a draft with  respect to the payment of interest on or
principal of the Bonds honored by the Bank shall. pro Tanto, reduce that portion
of the  Stated  Amount  available  under  this  Letter  of  Credit.  subject  to
reinstatement as provided below.  Following the honoring of a drawing  hereunder
to pay regularly scheduled principal of the Bonds or principal of the Bonds upon
an optional or  mandatory  redemption  of the Bonds,  that portion of the Stated
Amount  available  under  this  Letter of Credit to pay  interest  shall also be
reduced to an amount equal to  forty-five  (45) days'  accrued  interest (at the
rate of  interest  of 12% per annum  based on a 365-day  year) on the  principal
amount of the remaining  outstanding Bonds (other than Pledged Bonds (as defined
in the Reimbursement Agreement)).  In addition, the Stated Amount of this Letter
of Credit  shall also be reduced  by the  amount  stated in a written  notice of
reduction  executed by a purported  officer of the Trustee  substantially in the
form of Attachment B (which forms an integral part of this Letter of Credit).  A
reduction  of the  Stated  Amount  through  the use of such a written  notice of
reduction  shall be  effective  as of the actual  date of receipt by the Bank of
such notice at its above-stated address.


                                        3

<PAGE>



         The Stated Amount shall be reinstated as follows:

         (a) Following the honoring of a drawing under this Letter of Credit for
the  payment of the  purchase  price of Bonds  tendered,  or deemed to have been
tendered,  to the  Trustee or the  Tender  Agent (as  defined in the  Indenture)
pursuant to Section 4.06 or Section  4.07 of the  Indenture,  the Stated  Amount
shall be reinstated  automatically  and immediately  upon and to the extent that
you have received payment in immediately available funds of the principal of and
accrued interest on the Pledged Bonds in connection with the remarketing thereof
and are holding such  payment for the Bank's sole  benefit and account;  in such
case, (i) the principal  portion of this Letter of Credit shall be reinstated in
an amount equal to the  principal  amount of the  remarketed  Bonds and (ii) the
interest portion shall be reinstated to an amount equal to forty-five (45) days'
accrued interest on the Bonds outstanding (other than Pledged Bonds), calculated
at the rate of 12% per annum based on a 365-day year.  In connection  therewith,
you shall wire  transfer  such  payment to the Bank  immediately  after  receipt
thereof and you shall send to the Bank your telecopy  (promptly followed by mail
delivery) notifying the Bank of such payment.

         (b) Immediately following the honoring of a drawing hereunder to make a
regularly  scheduled interest payment on the Bonds (that is, other than interest
in connection with an optional  redemption or mandatory  redemption of the Bonds
in whole or in part or an  acceleration  or optional or mandatory  tender of the
Bonds)  in an  amount  set  forth  in the  certificate  in the  form of  Annex I
submitted in conjunction with such drawing, the Bank's obligation hereunder with
respect to the payment of interest on the Bonds will be automatically reinstated
by the amount of such drawing.

         (c) The  principal  and  interest  portions of the Stated  Amount shall
otherwise be reinstated as the Bank may from time to time notify you in writing.

         The Sumitomo Bank, Limited acknowledges and agrees, notwithstanding any
terms or provisions of this Letter of Credit or the  Reimbursement  Agreement to
the contrary, that this Letter of Credit is in all respects an obligation of The
Sumitomo Bank, Limited,  binding and enforceable against its properties,  assets
and revenues wherever located.

         This  Letter of Credit  shall be  governed  by the laws of the State of
California  including without  limitation,  Article 5 of the Uniform  Commercial
Code as in effect in the State of California,  as supplemented by the provisions
(to the extent such provisions are consistent with this Letter of Credit) of the
Uniform   Customs  and  Practice  for   Documentary   Credits  (1993   Revision)
International Chamber of Commerce, Publication No. 500 (the "Uniform Customs").


                                        4

<PAGE>



         We undertake that your draft and certificate  drawn and presented on or
before the time of expiration  of this Letter of Credit in  conformity  with the
terms of this Letter of Credit will be duly honored.


                                       Very truly yours,

                                       THE SUMITOMO BANK, LIMITED


                                       By:____________________________________
                                        __________________, Los Angeles Branch




                                        5

<PAGE>



ANNEX I (INTEREST DRAW) to 
Transferable  Irrevocable Direct Pay Letter of Credit
Issued by The Sumitomo Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to  Transferable  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

         1. As the Trustee pursuant to the Indenture, in trust for the owners of
the Bonds,  we hereby make demand for payment  under the Letter of Credit to pay
or provide for the payment of unpaid  interest on such Bonds in connection  with
either a  regularly  scheduled  interest  payment,  an  optional  redemption,  a
mandatory  redemption or  acceleration  of the Bonds.  Such Bonds have been duly
authenticated under and in accordance with the Indenture.

         2.  Interest  on the  Bonds  is now or  will  under  the  terms  of the
Indenture become due and payable on or prior to the regularly scheduled interest
payment date,  maturity  date or redemption  date of the Bonds and the aggregate
amount  required  to  pay  or to  provide  for  the  payment  of  the.  same  is
$________________ and payment of such amount is hereby demanded.

         3. The amount demanded does not exceed the amount available today to be
drawn  under the Letter of Credit in respect of the  payment of  interest on the
Bonds.

         4. Upon receipt of the amount demanded under this Letter of Credit,  we
will  apply the same  directly  to the  payment  when due of  interest  owing on
account of the Bonds.


                                        6

<PAGE>



         5. (Please wire the amount demanded hereunder to account no. __________
at  _______________  in __________  [Please credit account no. _____  maintained
with you.]

Dated as of __________ 19__.

                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.


                                        By:_____________________________________
                                        Title:__________________________________



                                        7

<PAGE>



ANNEX II  (PRINCIPAL  DRAW) to  
Transferable  Irrevocable  Direct  Pay Letter of Credit  Issued by The  Sumitomo
Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to  Transferable  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

         1. As the Trustee pursuant to the Indenture, in trust for the owners of
the Bonds,  we hereby make demand for payment  under the Letter of Credit to pay
all or a portion of the unpaid  principal  amount of such Bonds  which have been
duly authenticated under and in accordance with the Indenture in connection with
either an  optional  redemption,  a  mandatory  redemption  or upon  maturity or
acceleration of the Bonds.

         2.  Principal  on the  Bonds  is now or will  under  the  terms  of the
Indenture  become due and payable on or prior to the maturity date or redemption
date of the Bonds;  the drawing in the amount of  $____________ is being made to
pay the principal portion of each such Bond and payment of such amount is hereby
demanded.

         3. The amount demanded does not exceed the amount available on the date
hereof to be drawn  under the  Letter of Credit in  respect  of the  payment  of
principal on the Bonds.

         4. Upon receipt of the amount demanded under this Letter of Credit,  we
will apply the same directly to the payment of the principal owing on account of
the Bonds.

         5. The  Stated  Amount of the  Letter of  Credit  shall be  permanently
reduced by the amount of the draw hereunder.


                                        8

<PAGE>



         6. [Please wire the amount demanded hereunder to account no. __________
at _______________  in __________  [Please credit account no._______  maintained
with you.]

Dated as of __________, 19__.

                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.


                                        By:
                                        Title:



                                        9

<PAGE>



ANNEX III (PURCHASE PRICE DRAW) to

Transferable  Irrevocable  Direct  Pay Letter of Credit  Issued by The  Sumitomo
Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to  Transferable  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

         1. As the Trustee pursuant to the Indenture,  we hereby make demand for
payment under the Letter of Credit to pay a part or all of the interest  portion
and the principal  portion of the purchase  price to be paid in respect of Bonds
which have been duly  authenticated  under and in accordance  with the Indenture
and which have been  tendered or were deemed to have been  tendered  pursuant to
Section 4.06 or Section 4.07 of the Indenture and for which remarketing proceeds
have not been received.

         2. The drawing in the aggregate  amount of $  _______________  is being
made to pay the purchase  price of Bonds which have been tendered or were deemed
to have been tendered.  Such aggregate  amount equals the sum of the amounts set
forth in paragraphs 3 and 5 below.

         3. The portion of the drawing equal to $ _______________  is being made
to pay a part or all of the interest portion of the purchase price of such Bonds
which have been  tendered  or were  deemed to have been  tendered  and for which
remarketing  proceeds  have  not  been  received  corresponding  to the  accrued
interest thereon, and payment of such amount is hereby demanded.

         4. Upon  receipt of the amount set forth under  paragraph  3 above,  we
will apply the same  directly  to the  payment of a part or all of the  interest
portion of the amount to be paid in respect of the Bonds.

         5. The portion of the drawing equal to $ _______________  is being made
to pay the principal portion of the purchase price of such Bonds which have been
tendered or were deemed to have been tendered and for which remarketing proceeds
have not been received, and payment of such amount is hereby demanded.

                                       10

<PAGE>



         6. Upon  receipt of the amount set forth under  paragraph  5 above,  we
will apply the same  directly  to the  payment of the  principal  portion of the
purchase price to be paid in respect of the Bonds.

         7. The amount  set forth  under  paragraph  3 above does not exceed the
amount  available  on the date  hereof to be drawn under the Letter of Credit in
respect of the  payment of  interest on the Bonds and the amount set forth under
paragraph 5 above does not exceed the amount  available on the date hereof to be
drawn under the Letter of Credit in respect of the payment of  principal  on the
Bonds.

         8. [Please wire the amount demanded hereunder to account no. __________
at  _______________  in  __________.]  [Please  credit  account  no.  __________
maintained with you.]

Dated as of _______________ 19__.


                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.


                                         By:
                                         Title:



                                       11

<PAGE>



                    ATTACHMENT A TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                             (Transfer Certificate)

                                                     ____________________ 19__

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to Transfer-able  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit").

         The undersigned is the Trustee  referred to in the Letter of Credit and
we  hereby  give you  notice  that  __________  is the  successor  Trustee  (the
"Successor  Trustee")  under the Indenture  referred to in the Letter of Credit,
and that the Successor  Trustee shall succeed to all the rights and  obligations
of the Trustee under the Letter of Credit.

         Upon payment to you of a $2,000  transfer fee by Advanced  Aerodynamics
and Structures,  Inc., your consent to the transfer of the Letter of Credit with
the date thereof to be confirmed by a

                                       12

<PAGE>



Notary Public in Japan (or  otherwise  officially  established)  pursuant to the
laws of Japan and receipt by us of your acknowledgment and acknowledgment by the
Successor  Trustee of this notice,  the Letter of Credit shall be deemed to have
been transferred to the Successor Trustee.

                                        Very truly yours,

                                        First Trust of California, National 
                                        Association

                                        By:
                                        Title:

Agreed and Accepted:                    Acknowledged:

The Sumitomo Bank, Limited,             [Name of Successor Trustee]
acting through Its
Los Angeles Branch

By:_________________________________     By:
Title:______________________________     Title:
Date:_______________________________     Date:



                                       13

<PAGE>



                    ATTACHMENT B TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                             (Reduction Certificate)


                                                      ____________________ 19__

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to  Transferable  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series  1997  (Advanced   Aerodynamics   and   Structures,   Inc.   Project)  by
_______________ Dollars ($ __________). This reduction in Stated Amount shall go
to reduce that portion of the Stated Amount allocated to (principal, interest)1/
relating to the Bonds and shall be effective as of the actual date of receipt of
this instrument by The Sumitomo Bank, Limited. Accordingly, the Stated Amount of
the  Letter  of  Credit  after  giving  effect  to  such   reduction   shall  be
____________________  Dollars ($  _______________).  It is acknowledged that the
amount of such  reduction  shall no longer be  available  for  payment of drafts
under the Letter of Credit.  All terms used in this instrument which are defined
in the Letter of Credit shall have the same meaning in this instrument as in the
Letter of Credit.

                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture  referred to
                                        in the Letter of Credit.


                                         By:
                                         Title:


- --------
1/ Complete as appropriate.

                                       14

<PAGE>


                    ATTACHMENT C TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                              (Notice of Extension)


                                                      ____________________ 19__


The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

         We refer to  Transferable  Irrevocable  Direct Pay Letter of Credit No.
G/LA-400557 issued in support of the $8.500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series  1997  (Advanced  Aerodynamics  and  Structures,  Inc.  Project),  in the
original Stated Amount of $8,625,754 (the "Letter of Credit").  We hereby notify
you that, in accordance  with the terms of the Letter of Credit and that certain
Reimbursement   Agreement  dated  as  of  August  1,  1997,   between   Advanced
Aerodynamics and Structures, Inc. and us, the Stated Expiration Date (as defined
in the  Letter  of  Credit)  of the  Letter  of  Credit  has  been  extended  to
_______________.

         The portions of the Stated Amount of the Letter of Credit  available to
pay  principal  and  interest  on  the  Bonds  are  $   _______________   and  $
_______________, respectively, and the Stated Amount is $ _______________.

         This letter  should be attached to the Letter of Credit and made a part
thereof.

                                         THE SUMITOMO BANK, LIMITED
                                         LOS ANGELES BRANCH


                                         By:
                                         Its:




                                       15




                             REIMBURSEMENT AGREEMENT

                                     Between

                   ADVANCED AERODYNAMICS AND STRUCTURES, INC.

                                       And

                           THE SUMITOMO BANK, LIMITED
                              (LOS ANGELES BRANCH)


                               -------------------

                           Dated as of August 1, 1997

                                   Relating to
                                   $8,500,000
               California Economic Development Financing Authority
                         Variable Rate Demand Industrial
                     Development Revenue Bonds, Series 1997
              (Advanced Aerodynamics and Structures, Inc. Project)








                                        1

<PAGE>



                                TABLE OF CONTENTS



                                        2

<PAGE>



                             REIMBURSEMENT AGREEMENT


     THIS  REIMBURSEMENT  AGREEMENT  dated as of August 1, 1997 is entered  into
between  ADVANCED  AERODYNAMICS  AND STRUCTURES,  INC., a corporation  organized
under the laws of the State of  Delaware,  and THE  SUMITOMO  BANK,  LIMITED,  a
banking  corporation  organized under the laws of Japan,  acting through its Los
Angeles  Branch,  which branch is authorized to do business in California by the
Department of Financial Institutions.

                                    ARTICLE I

                                   DEFINITIONS

     Section  1.1  Definitions.  The  following  words  and  terms  used in this
Reimbursement Agreement shall have the following meanings:

     "Authorized  Officer"  means,  with respect to the Issuer,  its Chair,  its
Secretary  or any  other  officer  or  employee  of  the  issuer  authorized  by
resolution  of the Issuer to perform the act or sign the  document in  question,
and,  with respect to the Company,  any person so designated to act on behalf of
the Company by resolution of the Company.

     "Bank Rate" means LIBOR less 0.15% per annum.

     "Bank   Reimbursement   Obligations"   means  all  indebtedness  and  other
obligations  of the  Company to  Sumitomo  arising  under or in relation to this
Reimbursement Agreement or any other Related Document.

     "Bond" or "Bonds"  means the  $8,500,000  Variable  Rate Demand  Industrial
Development  Revenue Bonds,  Series 1997 (Advanced  Aerodynamics and Structures,
Inc.  Project)  dated  August 5, 1997,  authorized  and issued  pursuant  to the
Indenture.

     "Bond Documents" means the Bonds, the Resolutions,  the Indenture, the Loan
Agreement, the Remarketing Agreement, any and all other documents related to the
issuance of the Bonds, and all amendments and supplements to those documents.

     "Business  Day" means any day other than (a) a Saturday,  Sunday or any day
on which banking institutions located in the Cities of New York, New York or Los
Angeles,  California or the city in which the principal office of the Trustee or
the Remarketing  Agent  (initially,  San Francisco,  California) are located are
required or  authorized by law to close or (b) a day on which the New York Stock
Exchange or DTC is closed.

     "Closing Date" means August 5, 1997, or any other Business Day agreed to by
Sumitomo and the Company on which the Letter of Credit is issued.

                                        1

<PAGE>



     "Code" means the Internal Revenue Code of 1986, as amended.

     "Company" means Advanced  Aerodynamics and Structures,  Inc., a corporation
organized under the laws of the State of Delaware.

     "Conversion Date" means the date on which the interest rate on the Bonds is
converted  to a  Fixed  Interest  Rate  pursuant  to,  and as  defined  in,  the
Indenture.

     "Corporate  Base Rate" means the rate of  interest  publicly  announced  by
Morgan  Guaranty  Trust  Company  of New  York,  in New York,  New York,  or its
successor, from time to time as its corporate base rate.

     "Credit Amount" means the Stated Amount  outstanding from time to time less
the principal amount of any Loans  outstanding.  For purposes of determining the
Credit  Amount  the  Stated  Amount  shall not be  deemed  to have been  reduced
pursuant  to the  terms of the  Letter  of  Credit  other  than as a result of a
permanent reduction of the Stated Amount.

     "Credit Documents" means this Reimbursement Agreement, the Note, the Letter
of Credit, the Investment Agreement and the Pledge Agreement.

     "DTC"  means The  Depository  Trust  Company,  New York,  New York,  or its
nominee,  or its  successors  and assigns,  or any other  depository  performing
similar functions under the Indenture.

     "Default Rate" means the Corporate Base Rate plus two percent (2%).

     "Determination  of  Taxability"  has the meaning  given to that term in the
Indenture.

     "ERISA"  means the Employee  Retirement  Income  Security  Act of 1974,  as
amended.

     "Event of Default" has the meaning set forth in Section 5.1 hereof.

     "Expiration  Date"  means  the  earliest  to  occur  of (i)  the  close  of
Sumitomo's  business on the Stated  Expiration  Date; (ii) the date which is ten
(10) days following the Trustee's receipt of written notice from Sumitomo of the
occurrence  of an Event of Default and a direction to cause an  acceleration  of
all  outstanding  Bonds  pursuant  to the  Indenture;  (iii)  the  date on which
Sumitomo  receives notice from the Trustee that all Bonds have been paid in full
or such  payment  has been  provided  for in  accordance  with the  terms of the
Indenture;  (iv) the date on which  the Bonds  become  secured  by an  Alternate
Letter of Credit in accordance with the terms of the Indenture;  (v) the date on
which the interest  rate on the Bonds is converted to a Fixed  Interest  Rate in
accordance with the terms of the Indenture;  and (vi) the date on which Sumitomo
honors a drawing  following a mandatory  tender of the Bonds pursuant to Section
4.07 of the Indenture.

     "GAAP" means generally accepted  accounting  principles in effect from time
to time.

                                        2

<PAGE>



     "Governmental Requirement" means any law, statute, code, ordinance,  order,
rule, regulation, judgment, decree, injunction,  franchise, permit, certificate,
license,  authorization  or other direction or requirement  (including,  without
limitation,  any of the  foregoing  which relate to  environmental  standards or
controls,  energy  regulations and occupational,  safety and health standards or
controls)  of  any  federal,  state,  county,  municipal  or  other  government,
department, commission, board, court, agency or any other instrumentality of any
of them,  which exercises  jurisdiction  over the Company or any of its Property
(including, without limitation, the Project).

     "Indebtedness"  means and  includes,  as of any date as of which the amount
thereof is to be  determined,  (i) all items (other than  capital  items such as
surplus and fund  balances,  as well as reserves  for taxes in respect of income
deferred  to the  future  and other  deferred  credits  and  reserves)  which in
accordance with generally accepted  accounting  principles  (including,  without
limitation,   capitalized   leases)  would  be  included  in  determining  total
liabilities  on the  balance  sheet  of a  Person  as of  such  date,  (ii)  all
obligations  which are secured by any Lien  existing  on Property  owned by such
Person,  whether or not the obligations  secured thereby shall have been assumed
by any other  Person,  (iii) all  obligations  of such  Person to  purchase  any
materials,  supplies or other  Property,  or to obtain the services of any other
Person, if the relevant contract or other related document requires that payment
for such materials,  supplies or other Property, or for such services,  shall be
made regardless of whether or not delivery of such materials,  supplies or other
Property  is ever  made or  tendered  or such  services  are ever  performed  or
tendered, and (iv) all guarantees by such Person for the payment of Indebtedness
of others of the character described in (i) through (iii) above.

     "Indenture" means the Indenture of Trust dated as of August 1, 1997 between
the Issuer and the Trustee,  and all  amendments  and  supplements to that Trust
Indenture.

     "Interest  Payment  Date"  has  the  meaning  given  to  that  term  in the
Indenture.

     "Investment  Agreement" means the Investment Agreement dated August 5, 1997
between the Company and Sumitomo,  substantially in the form attached as Exhibit
B, and all amendments and supplements thereto.

     "Issuer" means the California Economic Development  Financing Authority,  a
body public and corporate and a public instrumentality of the State.

     "Letter of Credit" means the Transferable  Irrevocable Direct Pay Letter of
Credit,  substantially  in the form  attached  as  Exhibit  A, to be  issued  by
Sumitomo on the Closing  Date,  including  any  extension  of that letter or any
letter of credit issued by Sumitomo in replacement for that letter.

     "LIBOR" means with respect to any Reset Date (as  hereinafter  defined) the
arithmetic  mean of the rates at which  deposits in U.S.  Dollars are offered by
four  major  banks In the  London  interbank  market  selected  by the Bank,  at
approximately 11:00 a.m., London time, on the day that is two

                                        3

<PAGE>



Business Days  preceding  the Reset Date to prime banks in the London  interbank
market for a period of one (1) week commencing on the Reset Date.

     "Lien" means (i) any interest in Property (whether real, personal or mixed)
which  secures  an  obligation  owed to a Person  other  than the  owner of such
Property,  including,  without  limitation,  any such  interest  arising  from a
mortgage, charge, pledge, security agreement, conditional sale or trust receipt,
or arising from a lease,  consignment or bailment  given for security  purposes,
(ii) any  encumbrance or charge upon such Property which does not secure such an
obligation,  and (iii) any  exception  to or defect in the title to or ownership
interest in such Property.

     "Loan"  means a loan made to the  Company  pursuant  to Section 2.5 of this
Reimbursement Agreement.

     "Loan  Agreement"  means  the Loan  Agreement  dated as of  August  1, 1997
between the Issuer and the Company,  and all amendments and  supplements to that
Loan Agreement.

     "Non-tendered  Bonds" means Bonds which were required to be tendered  under
Section 4.07 of the Indenture  following notice of mandatory  tender  thereunder
and which are  deemed to have been  properly  tendered  to the  extent  that the
Trustee  has  sufficient  moneys for the payment of the  purchase  price of such
Bonds.

     "Note" means the Direct Obligation Note, substantially in the form attached
as Exhibit C, being issued by the Company to Sumitomo on the Closing Date.

     "Official  Statement"  means the  Official  Statement  of the Issuer  dated
August 4, 1997 relating to the Bonds.

     "Outstanding Bonds" or "Bonds Outstanding" when used in connection with the
Bonds shall have the same meaning as in the Indenture.

     "Person" means an individual, a corporation, a partnership, an association,
a joint stock company, a joint venture, a trust, an unincorporated organization,
or a government or any agency or political subdivision thereof.

     "Pledge  Agreement" means the Custody,  Pledge and Security Agreement dated
as of August 1, 1997 among the Trustee as  custodian,  the Company and Sumitomo,
substantially  in the  form  attached  as  Exhibit  D,  and all  amendments  and
supplements thereto.

     "Pledged Bond" means any Bond during the period from and including the date
of its  purchase  with  amounts  realized  under  the  Letter  of  Credit to but
excluding  the date on which such Bond is  purchased  by any  Person  other than
Sumitomo or the Company.

     "Pledged Collateral" has the meaning set forth in Section 2.8 hereof

                                        4

<PAGE>



     "Potential  Default"  means an event which but for the lapse of time or the
giving of notice, or both, would constitute an Event of Default.

     "Project"  means  the  construction  and  installation  of a  manufacturing
facility by the Company, financed with the proceeds of the Bonds.

     "Property" means any and all rights,  titles and interests of any Person in
and to any and all property,  whether real or personal,  tangible or intangible,
wherever situated.

     "Rebate  Consultant"  means a firm  of  nationally  recognized  independent
certified  accountants,  as  consultants  appointed by the Company,  to make the
calculations and determinations required by Section 147(f) of the Code.

     "Regulation U" means  Regulation U of the Board of Governors of the Federal
Reserve  System from time to time in effect and includes any  successor or other
regulation or official  interpretation of the Board of Governors relating to the
extension of credit by banks for the purpose of  purchasing  or carrying  margin
stocks applicable to member banks of the Federal Reserve System.

     "Reimbursement  Agreement" means this  Reimbursement  Agreement dated as of
August  1, 1997  between  the  Company  and  Sumitomo,  and all  amendments  and
supplements to this Reimbursement Agreement.

     "Related Documents" means the Credit Documents,  the Bond Documents and any
other agreement or instrument relating thereto.

     "Remarketing  Agent" means Rauscher  Pierce  Refsnes,  Inc., as remarketing
agent for the Bonds, and any successor variable rate remarketing agent appointed
in accordance with the terms hereof and of the Indenture.

     "Remarketing  Agreement" means that certain Remarketing  Agreement dated as
of August 1, 1997, among the Remarketing Agent, the Issuer and the Company,  and
any similar agreement with respect to any successor remarketing agent.

     "Reset Day" means  Wednesday  of each week (or, if such  Wednesday is not a
Business Day, the next Business Day).

     "Resolutions" means the resolutions of the Issuer adopted on April 30, 1997
and June 20, 1997,  authorizing  the issuance of the Bonds,  and  approving  the
Letter of Credit.

     "Section" means a numbered section of this  Reimbursement  Agreement unless
another document is specifically referenced.

     "State" means the State of California.

                                        5

<PAGE>



     "Stated Amount" has the meaning given to that term in the Letter of Credit.

     "Stated  Expiration Date" means August 5, 2002, or such later date to which
the Stated Expiration Date may be extended from time to time pursuant to Section
2.9 hereof.

     "Sumitomo"  means  The  Sumitomo  Bank,   Limited,  a  banking  corporation
organized under the laws of Japan, acting through its Los Angeles Branch,  which
branch is authorized to do business in California by the Department of Financial
Institutions.

     "Taxes" has the meaning set forth in Section 2.10 hereof.

     "Trust Estate" means the Revenues and other assets granted by the issuer to
the Trustee  pursuant to Section  5.01 of the  Indenture  for the benefit of the
holders of the Bonds and Sumitomo.

     "Trustee"  means  the  trustee  at the  time  serving  as  such  under  the
Indenture, currently First Trust of California, National Association.

     The foregoing  definitions shall be equally applicable to both the singular
and plural  forms of the  defined  terms.  All times used in this  Reimbursement
Agreement shall refer to Los Angeles, California time unless otherwise stated.

     Section 1.2 Terms Defined in Indenture. Terms not otherwise defined in this
Reimbursement Agreement shall have the meanings given to them in the Indenture.

                                   ARTICLE II

                                      TERMS

     Section 2.1 Issuance of Letter of Credit.  Subject to the  satisfaction  of
the terms and conditions of this  Reimbursement  Agreement,  Sumitomo  agrees to
issue the Letter of Credit on the Closing  Date.  The Letter of Credit  shall be
issued by Sumitomo in the initial Stated Amount of $8,625,754  which  represents
$8,500,000 in principal amount of the Bonds and forty-five (45) days of interest
on the Bonds at an interest  rate of 12% per annum  calculated on the basis of a
year of 365 days).

     Section 2.2 Letter of Credit Fees.

          (a) The Company agrees to pay Sumitomo on or before the Closing Date a
nonrefundable  facility fee of $8,626 (0.10% of the initial Stated Amount).  The
Bank acknowledges receipt of such fee.

          (b) For a term  commencing  on the  Closing  Date  and  ending  on the
Expiration Date, the Company agrees to pay Sumitomo a support fee (calculated on
the basis of a year

                                        6

<PAGE>



of 360 days for actual days elapsed) equal to twenty-five one hundredths percent
(0.25%) per annum of the average  daily Credit  Amount  payable at the office of
Sumitomo in Los Angeles, California (or such other office of Sumitomo located in
the United States of America as Sumitomo may designate to the Company in writing
from time to time),  quarterly in arrears on November 1, 1997 and  thereafter on
each February 1, May 1, August 1 and November 1. Notwithstanding any other terms
or provisions  herein  contained,  such support fee shall be prorated (i) to the
date on which  the  Letter of Credit  is  cancelled,  in the event a  substitute
credit facility is issued and the Letter of Credit is surrendered by the Trustee
for cancellation, or (ii) to the Expiration Date, as appropriate.

     Section 2.3 Drawing and Transfer  Fees. The Company agrees to pay Sumitomo-
$100 each time there is a draw on the Letter of Credit, regardless of the amount
of such drawing. In addition, the Company agrees to pay Sumitomo $2,000 upon the
transfer of the Letter of Credit to a successor Trustee under the Indenture.

     Section  2.4  Reimbursement  for  Certain  Draws.  The  Company  agrees  to
immediately  reimburse  Sumitomo or cause Sumitomo to be immediately  reimbursed
for the amount of any draft drawn under the Letter of Credit on the date of such
drawing  either (i) for payment of interest on the Bonds  whether for  regularly
scheduled  interest  payments on an Interest  Payment Date or at maturity or for
accrued interest on Bonds subject to optional redemption or mandatory redemption
or acceleration pursuant to the Indenture;  (ii) for payment of principal on the
Bonds  whether at maturity or pursuant to an optional  redemption or a mandatory
redemption or an acceleration pursuant to the Indenture; or (iii) for payment of
the purchase price of Bonds tendered or deemed tendered pursuant to Section 4.06
or Section 4.07 of the  Indenture.  Each amount for which the Company has agreed
to reimburse  Sumitomo pursuant to this Section 2.4 shall bear interest from the
date on which  Sumitomo  honors a  drawing  under  the  Letter of Credit in such
amount until paid at a rate per annum  (calculated on the basis of a year of 360
days for actual days elapsed) equal to the Default Rate,  which rate of interest
shall change when and as such Default Rate changes.

     Section 2.5 Loan.

          (a)  Subject  to the  satisfaction  of the ten-ns  and  conditions  in
Section 7.2 of this Reimbursement  Agreement,  Sumitomo agrees to make a Loan to
the Company on each  purchase  date to purchase  Bonds  delivered to the Trustee
pursuant to Section 4.06 or Section 4.07 of the Indenture and Non-Tendered Bonds
which have not been remarketed,  in a principal amount equal to the amount drawn
under the Letter of Credit  (other  than  amounts to be  reimbursed  to Sumitomo
pursuant to Section 2.4);  provided,  however,  that if the terms and conditions
set forth in Section 7.2 are not  satisfied,  the Company  agrees to immediately
reimburse Sumitomo or cause Sumitomo to be immediately reimbursed for the amount
drawn  under the Letter of Credit to  purchase  such  Bonds.  The Loans shall be
evidenced by and payable pursuant to the Note.


                                        7

<PAGE>



          (b) The principal  amount of each Loan shall be due and payable on the
 .earliest of (i) the Expiration  Date,  (ii) the date on which any Pledged Bonds
purchased  with finds  disbursed  under the Letter of Credit in connection  with
such Loan are redeemed or cancelled pursuant to the Indenture, (iii) the date on
which any  Pledged  Bonds  purchased  with funds  disbursed  under the Letter of
Credit are  remarketed  pursuant  to the  Indenture,  (iv) the date on which the
Letter of Credit is replaced by an Alternate  Credit  Enhancement  in accordance
with the terms of the Indenture and Section 4.10 hereof,  and (v) the date which
is 30 days  immediately  succeeding the date of such Loan.  Each Loan shall bear
interest,  payable monthly in arrears, on its outstanding principal balance at a
rate per annum  (calculated  on the basis of a year of 360 days for actual  days
elapsed)  equal to the Bank Rate from the date of such Loan  until the  maturity
(whether by acceleration or otherwise) of such Loan.  Amounts owing on each Loan
which are not paid on the maturity date shall bear interest,  payable on demand,
until paid at the  Default  Rate.  Each Loan may be prepaid by the  Company,  in
whole or in part, at any time upon two (2) Business  Days'  written  notice from
the Company to Sumitomo, by payment of the principal amount to be so prepaid and
accrued interest on such amount to the date of prepayment. Sumitomo shall record
all Loans and all payments  made on account of the  principal due on the Loan on
the loan schedule  attached to the Note.  Sumitomo's  endorsements  on such loan
schedule shall be conclusive absent manifest error. The failure to make any such
notation shall not, however,  impair the Company's obligations hereunder and the
failure to make a notation  with respect to any  prepayment  shall not prejudice
any assertion by the Company that a prepayment has been made.

          (c) The Company and  Sumitomo  agree that in the event  Pledged  Bonds
held by the Trustee as Custodian  under the Pledge  Agreement are  remarketed by
the Remarketing Agent, the amount received from the remarketing shall be paid to
Sumitomo in full or partial payment of the outstanding balance of any Loan.

     Section 2.6 Additional  Amounts.  If the implementation of or any change in
any law or regulation or in the interpretation by any court or administrative or
governmental  authority  charged  with  their  administration  shall  either (i)
impose, modify or deem applicable any reserve, special deposit, capital adequacy
or similar requirement not existing on the date of this Reimbursement  Agreement
against  letters of credit issued by Sumitomo,  or any assets held by,  deposits
with or for the account of, or loans or commitments by, an office of Sumitomo in
connection  with  payments  by  Sumitomo  under the Letter of Credit  (including
without  limitation a request or  requirement  which affects the manner in which
Sumitomo   allocates  capital  resources  to  its  commitments,   including  its
obligations  hereunder);  or (ii) impose on  Sumitomo  any other  condition  not
existing  on  the  date  of  this   Reimbursement   Agreement   regarding   this
Reimbursement  Agreement  or the Letter of  Credit,  and the result of any event
referred  to in clause (i) or (ii) above  shall be to (x)  increase  the cost to
Sumitomo of issuing or maintaining  the Letter of Credit (which increase in cost
shall be the result of Sumitomo's reasonable allocation of the aggregate of such
cost increases resulting from such events), or (y) reduce any amounts payable by
the Company hereunder, or (z) reduce the rate of return on Sumitomo's capital as
a consequence of its  obligations  hereunder or its issuance and  maintenance of
the Letter of Credit to a level below that which  Sumitomo  could have  achieved
but for such

                                        8

<PAGE>



circumstances,  then the Company shall immediately pay to Sumitomo, from time to
time as specified by Sumitomo,  additional  amounts which shall be sufficient to
compensate  Sumitomo for such  increased cost or reduction in payment or in rate
of return, together with interest at the Corporate Base Rate on each such amount
from the date  demanded  until paid in full.  Each demand by Sumitomo  hereunder
shall be  accompanied by a certificate  setting forth in reasonable  detail such
increased  cost or  reduction in payment or in rate of return as a result of any
event mentioned in clause (i) or (ii) above and shall, absent manifest error, be
conclusive.  In  determining  such  amounts,  Sumitomo  may use  any  reasonable
commonly accepted averaging and attribution methods.

     Section  2.7  Reimbursement  Unconditional.  The  Company's  obligation  to
reimburse  Sumitomo  for  payments  under the Letter of Credit  made by Sumitomo
shall be absolute and unconditional  under any and all circumstances,  including
without  limitation  the  following:  (i) the  existence of any claim,  set-off,
counterclaim or defense to payment which the Company may have against  Sumitomo,
the Issuer,  the Trustee or any other Person,  including without  limitation any
failure to receive any of the proceeds from the sale of the Bonds to which it is
entitled,  misapplication by the Trustee of such proceeds or the proceeds of any
draw  under  the  Letter  of  Credit,  or (ii) the lack of  legality,  validity,
regularity or  enforceability of the Related  Documents,  (iii) any amendment or
waiver of or consent to departure from any or all of the Related Documents, (iv)
any statement or any other document presented under the Letter of Credit proving
to be forged, fraudulent, invalid or insufficient or any statement therein being
untrue  or  inaccurate,  (v) any other  circumstance  or  happening  whatsoever,
whether or not similar to any of the foregoing.

     Section 2.8 Security for Bank Reimbursement Obligations.  To secure the due
payment and performance of all Bank Reimbursement  Obligations,  (i) the Company
has caused the Credit  Documents to be executed and delivered to Sumitomo,  (ii)
pursuant to the Indenture, the Issuer has granted to the Trustee for the benefit
of Sumitomo all of its rights,  title and  interest in and to the Trust  Estate,
subject  only to the  security  interest  therein  granted  by the Issuer to the
Trustee  for the  benefit of the  holders of the  Bonds,  and (iii) the  Company
hereby  pledges  and  assigns to  Sumitomo,  and  grants to  Sumitomo a security
interest in and to, the investment Agreement and all moneys and investments held
thereunder.  The interests,  rights and amounts pledged to Sumitomo as described
in this Section 2.8 are hereinafter referred to as the "Pledged Collateral". The
Company  shall  execute and deliver to  Sumitomo,  at any time at the request of
Sumitomo,  all such financing  statements and other instruments and documents as
Sumitomo may reasonably request, in a form satisfactory to Sumitomo,  to perfect
and maintain  perfected any security interest granted by the Company to Sumitomo
in the Pledged Collateral.

     Section 2.9  Extension  of Term.  The initial  term of the Letter of Credit
shall be extended by two years at the written  request of the Company  delivered
to Sumitomo on or before  August 5, 2000 ff  Sumitomo,  in its sole  discretion,
notifies  the Issuer,  the Company and the Trustee in writing  within  three (3)
months of its  receipt  of such  request  that the  Letter of Credit  will be so
extended. Thereafter, the Letter of Credit shall be extended by two years at the
written  request of the Company  delivered on or before August 5 in every second
succeeding year if Sumitomo, in its sole discretion, gives notice to such effect
within three (3) months of its receipt of such request. In the event of such

                                        9

<PAGE>



an  extension  or  extensions,  Sumitomo  shall extend the term of the Letter of
Credit  by  delivering  to the  Trustee,  on or  prior to the  fifteenth  (15th)
Business  Day  next  preceding  the  related   Expiration  Date,  a  certificate
substantially  in the form of  Attachment  C to the Letter of  Credit.  Any such
extension shall be at the sole discretion of Sumitomo and Sumitomo  reserves the
right to renegotiate any provision hereof in connection with any such extension.

     Section 2.10 Taxes on Payments. All payments made by the Company under this
Reimbursement  Agreement shall be made free and clear of, and without  deduction
or  withholding  for or on account of, any present and future  income,  stamp or
other taxes,  levies,  imposts,  deductions,  charges, or withholdings  imposed,
assessed,  levied or collected by any country or any  political  subdivision  or
taxing authority  thereof or therein,  but excluding taxes imposed on net income
of Sumitomo  by the country  under the laws of which  Sumitomo is  organized  or
managed and controlled or any political  subdivision or taxing authority thereof
or  therein or the  country in which  Sumitomo's  office  issuing  the Letter of
Credit may be located or any taxing  authority  of such  country or the state or
any political  subdivision or taxing authority of the state in which such office
is located (all such non-excluded taxes, levies, imposts, deduction,  charges or
withholdings being hereinafter called "Taxes").  If any Taxes are required to be
withheld from any amounts payable to Sumitomo hereunder,  the amounts so payable
to Sumitomo  shall be  increased  to the extent  necessary  to yield to Sumitomo
(after  payment  of all  Taxes)  interest  or any  such  other  amounts  payable
hereunder  at the  rates  or in the  amounts  specified  in  this  Reimbursement
Agreement.  Whenever  any Tax is paid by the  Company,  as  promptly as possible
thereafter,  the Company shall send to Sumitomo a certified copy of any original
official receipt received by the Company showing payment thereof. If the Company
fails to pay any Taxes when due to the appropriate taxing authority, the Company
shall indemnify Sumitomo for any incremental  taxes,  interest or penalties that
may become payable by Sumitomo as a result of any such failure.

     Section 2.11 Making of Payments.  All payments to Sumitomo shall be made in
immediately  available  funds at the Los Angeles office (or such other office of
Sumitomo  located in the United  States of America as Sumitomo may  designate to
the Company in writing from time to time),  not later than 1:00 p.m. on the date
due; and funds received after that hour shall be deemed to have been received by
Sumitomo on the next following  Business Day. If any such payment falls due on a
day which is not a Business  Day,  then such due date shall be  extended  to the
next following Business Day, and appropriate  additional  interest or fees shall
accrue and be payable for the period of such extension.

     Section 2.12 Project Fund Requisitions. The Company and Sumitomo understand
and agree that Sumitomo  shall not approve any  Requisition  pursuant to Section
3.03 of the  Indenture  at any time that the  aggregate  amount held by Sumitomo
pursuant to the Investment Agreement is less than the aggregate principal amount
of Bonds Outstanding.


                                       10

<PAGE>



                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

     In order to induce  Sumitomo to enter into and perform  this  Reimbursement
Agreement,  including,  without limitation,  to issue and maintain the Letter of
Credit, the Company hereby represents and warrants to Sumitomo as follows:

     Section 3.1 Organization and Authorization. The Company is duly and validly
organized and existing under the laws of the State of Delaware,  is qualified to
do business in all jurisdictions (including the State) in which the ownership of
property  or the  nature  of its  business  requires  such  qualification  under
applicable  law or where failure to so qualify  would have an adverse  effect on
its business or properties, and has all requisite power and authority to conduct
its business as now conducted and as proposed to be conducted.

     Section 3.2 Power and  Authority.  The Company has full power and authority
to execute,  deliver and perform this  Reimbursement  Agreement  and the Related
Documents  to which  it is a party,  and has the full  power  and  authority  to
execute,  deliver and perform all other agreements and instruments  executed and
delivered  or to be executed and  delivered  by it pursuant to or in  connection
with this Reimbursement Agreement, the Bonds and the Related Documents.

     Section 3.3 Bank Reimbursement  Obligations Legal, Valid and Binding.  This
Reimbursement  Agreement  and the  Related  Documents  to which the Company is a
party have been duly and validly  authorized,  executed and delivered by it, and
constitute its legal, valid and binding  obligations  enforceable  against it in
accordance  with their  respective  terms,  except insofar as enforcement may be
limited by  applicable  bankruptcy,  insolvency,  reorganization,  moratorium or
similar  laws  affecting  the  enforcement  of  creditors'  rights and  remedies
generally,  and by general  principles of equity,  whether applied by a court of
law or equity.

     Section 3.4 No Legal Bar.  The  Company is not in default  under any of the
provisions  of its  certificate  of  Incorporation  or by-laws  (other  than any
defaults  which will be cured on the Closing Date  following the issuance of the
Bonds),  or any  laws of the  State  of  Delaware,  the  State,  and  all  other
jurisdictions  which would  affect its  existence  or its powers  referred to in
Section 3.1. The  execution,  delivery  and  performance  by the Company of this
Reimbursement  Agreement -and the Related  Documents to which it is a party, and
all other  agreements and  instruments  relating to the foregoing to be executed
and delivered by it In connection  herewith and  therewith,  (i) do not and will
not violate any provision of its certificate of incorporation or by-laws, or any
Governmental Requirement, and (ii) do not and will not violate any provision of,
constitute a default under,  or result in the creation or imposition of any Lien
on any assets of the Company (other than the Project) pursuant to the provisions
of, any mortgage,  indenture,  contract, agreement or other undertaking to which
it as a party or which purports to be binding on it or on any of its assets.


                                       11

<PAGE>



     Section 3.5 Consents. The Company has obtained or will obtain all consents,
permits,  licenses  and  approvals  of,  and  has  made  all  registrations  and
declarations  with,  and taken all other  actions with respect to,  governmental
authorities  required  under law to authorize its execution and delivery of this
Reimbursement Agreement and the Related Documents to which it is a party and all
other  agreements to be delivered in connection  with any thereof,  and all such
consents, permits, licenses, approvals, registrations,  declarations and actions
remain in fun force and effect.

     Section  3.6  Litigation.  There  is  no  action,  suit,  investigation  or
proceeding  pending  or,  to  the  best  of its  knowledge  after  due  inquiry,
threatened against or affecting the Company or the Project,  the result of which
could have a material  adverse  effect on the financial  condition,  business or
operations of the Company or impair its ability to perform or observe any of its
duties,  liabilities or obligations under this Reimbursement Agreement or any of
the Related Documents to which it is a party.

     Section 3.7 Related Documents.  As of the Closing Date, after giving effect
to the issuance of the Bonds, the  representations and warranties of the Company
set forth in the Related  Documents to which it is a party are true and accurate
and are deemed to be repeated herein for the benefit of Sumitomo as if fully set
forth in this Reimbursement Agreement.

     Section  3.8  Official  Statement.  Neither  information  furnished  by the
Company  contained in the Official  Statement,  nor any  certificate  or written
statement or any other data  furnished by it to Sumitomo in connection  with the
negotiation of this  Reimbursement  Agreement or the  transactions  contemplated
hereby,  contains any untrue  statement  of a material  fact or omits to state a
material fact necessary to make the statements  contained  herein or therein not
misleading;  there is no fact known to it which materially  adversely affects or
in the future may materially adversely affect its business, property, assets, or
financial  condition  which  has  not  been  set  forth  in  this  Reimbursement
Agreement,  the  Related  Documents,  the  Official  Statement  or in the  other
documents,  certificates and statements furnished to Sumitomo by it prior to the
date hereof in connection with the transactions contemplated hereby.

     Section 3.9 Collateral.

          (a) Pledged  Bonds.  The Company  has,  and on the date of delivery to
Sumitomo of any Pledged Bonds will have,  full power,  authority and legal right
to cause the Pledged Bonds to be transferred,  delivered and registered pursuant
to the terms of this  Reimbursement  Agreement,  the Pledge  Agreement,  and the
Indenture.  The Company  covenants  and agrees  that it will  defend  Sumitomo's
right,  title and interest in and to the Pledged Bonds and the proceeds  thereof
against the claims and demands of all Persons whomsoever.

          (b) Pledged  Collateral.  The  provisions  of the  Indenture  and this
Reimbursement  Agreement  are  effective to create in favor of Sumitomo a legal,
valid and enforceable  pledge of, and a fully perfected security interest in and
lien  on all of the  Pledged  Collateral,  including,  without  limitation,  the
Investment Agreement. The Company covenants and agrees that it

                                       12

<PAGE>



will  defend  Sumitomo's  right,  title  and  interest  in and  to  the  Pledged
Collateral,  including  but not  limited to the  Investment  Agreement,  and the
proceeds thereof against the claims and demands of all Persons whomsoever.

     Section 3.10 Balance Sheet. The balance sheet of the Company as at December
31, 1996 and the related  statements  of income and fund balances of the Company
for the  calendar  year  ended  December  31,  1996  (copies  of which have been
furnished to Sumitomo) fairly present the financial  condition of the Company as
of such date and the  results of the  operations  of the  Company for the period
ended on such  date;  and since such date,  there has been no  material  adverse
change in the  financial  condition,  results of  operations or prospects of the
Company  except as disclosed to Sumitomo by the Company in writing  prior to the
Closing Date.

     Section 3.11 Existence of Debt and Liens.

          (a) Debt.  The  Company  does not have any  outstanding  Indebtedness,
except as permitted pursuant to Section 4.2(c).

          (b) Lines.  There are no Liens (including  liens or retained  security
titles of conditional  vendors) of any nature whatsoever securing the payment of
Indebtedness  on any  properties of the Company,  except as permitted by Section
4.2(b).

     Section 3.12 Material Conflicts. Each of the material contracts, leases and
other  agreements  (including,  without  limitation,  each  contract,  lease  or
agreement  covered  by or to be covered by any  Related  Document)  to which the
Company  is a party is in full force and  effect,  and as of the  Closing  Date,
after giving effect to the issuance of the Bonds,  the Company is not in default
under any thereof,  nor is the Company  aware of any default or any event which,
with the giving of notice or lapse of time or both,  would  constitute a default
under any of such documents.

     Section 3.13 ERISA.  The Company does not  maintain or  participate  in any
plan which is subject to ERISA.

     Section  3.14  Compliance  with Land Use  Ordinances  and  Agreements.  The
Project  is or will be in  material  compliance  with all local  ordinances  and
agreements  affecting the Project,  including  applicable  zoning,  land use and
planned unit development ordinances and agreements.

                                   ARTICLE IV

                                    COVENANTS

     Section 4.1  Company's  Affirmative  Covenants.  The Company  covenants and
agrees with Sumitomo that it will do the following so long as any amounts may be
drawn under the Letter of Credit,  and  thereafter so long as any amounts remain
outstanding or Bank Reimbursement

                                       13

<PAGE>



Obligations  remain  unfulfilled  under  this  Reimbursement  Agreement,  unless
Sumitomo shall otherwise consent in writing-

          (a) Notice of Defaults and  Bankruptcy.  The Company  shall  forthwith
notify  Sumitomo,  the Remarketing  Agent, and the Trustee,  in writing,  of the
occurrence of any Event of Default or any event which, with the giving of notice
or lapse of time or both, would  constitute an Event of Default,  or any default
under the Related  Documents or any filing by it or any of its  affiliates  of a
petition in bankruptcy  under the United States  Bankruptcy  Code, 11 U.S.C. ss.
101, et seq., or any successor or similar  provisions now or hereafter in effect
and applicable to it or such affiliates.

          (b)  Financial  and Other  information.  The Company  shall furnish to
Sumitomo,  as soon as available  and in any event within 90 days after the close
of its fiscal  year,  (i) a balance  sheet of the  Company as of the end of each
fiscal year, (ii) the related statements of changes in fund balances,  and (iii)
the  related  statements  of  revenues,  expenditures  and the  changes for such
calendar year,  all of which shall be certified by an Authorized  Representative
of the Company and prepared on a  consistent  basis.  In  addition,  the Company
shall furnish to Sumitomo on each April 15, July 15,  October 15 and January 15,
a financial summary of the operations of the Project for the preceding  calendar
quarter and from time to time, as Sumitomo may  reasonably  request,  such other
financial information  concerning the Company and the Project in order to enable
Sumitomo  to  determine  whether the  covenants,  terms and  provisions  of this
Reimbursement Agreement, the Related Documents and all other indebtedness of the
Company  have  been  complied  with by the  Company,  and for that  purpose  all
pertinent  books,  documents  and vouchers  relating to the  Company's  business
affairs and properties  shall at all times during regular business hours be open
to the  inspection of such  accountants  or other agents (who may make copies of
all or any part  thereof  at their own cost and  expense)  as shall from time to
time reasonably be designated by Sumitomo.  Without limiting the foregoing,  the
Company will permit Sumitomo and its designated  agents to visit and inspect any
of the  properties  of the  Company  and to discuss the  affairs,  finances  and
accounts of the Company with its officers and employees and any accounting  firm
performing services for the Company,  all at such times and as often as Sumitomo
may reasonably request.

          (c)  Compliance  with Credit and Bond  Documents.  The  Company  shall
observe and comply with all of its  obligations  arising in connection  with the
Credit  Documents  and  the  Bond  Documents  to  which  it is a  party  and its
certificate of incorporation and by-laws, and all Governmental Requirements, and
all of its covenants and  agreements  contained in the Credit  Documents and the
Bond  Documents to which it is a party are hereby  reaffirmed  and adopted by it
for the benefit of Sumitomo  and are  incorporated  by  reference  herein as now
written  and agreed  upon.  If the  Company  does not  observe or comply with an
obligation arising in connection with this Reimbursement  Agreement or the other
Credit  Documents  or the Bond  Documents  to which it is a party,  Sumitomo may
inform the Company of such non-  observance or  non-compliance  and request that
the  Company  immediately  observe or comply  with such  obligation;  and if the
Company does not so observe or comply to Sumitomo's

                                       14

<PAGE>



satisfaction  within three (3) Business Days after such  request,  then Sumitomo
may,  but shall not be  required  to,  perform or satisfy  such  obligation  and
request  that the Company  reimburse  Sumitomo in  accordance  with  Section 8.5
hereof.

          (d)  Insurance.  The  Company  shall from and after the  Closing  Date
continuously  maintain  at all  times  insurance  with  respect  to the  Project
satisfactory  in all respects to Sumitomo.  Sumitomo  agrees that the  insurance
currently  in force with  respect to the  Project  is  satisfactory.  Any public
liability  insurance  policy shall name the Trustee and  Sumitomo as  additional
insureds.  All insurance  policies shall contain a provision that they shall not
expire,  be canceled or materially  modified by the insurer except upon at least
thirty (30) days' prior written notice to the Company, the Trustee and Sumitomo.
On the Closing  Date,  the Company  shall  provide to the Trustee and Sumitomo a
certificate  or  certificates  of  insurance   establishing  that  the  required
insurance  is in full force and effect,  and shall,  upon request of Sumitomo or
the Trustee,  furnish copies to the requesting  party of the original  insurance
policies required by this Section 4.1(d).

          (e) Licenses and Permits.  The Company  shall take all  necessary  and
appropriate action to ensure the continuance in force of all consents, licenses,
permits, orders, decrees, approvals,  authorizations,  registrations and filings
obtained or made by it in  connection  with this  Reimbursement  Agreement,  the
Project or the Related  Documents  or  necessary  to  authorize  the  execution,
delivery  and  performance  of this  Reimbursement  Agreement  by it,  or of the
Related  Documents  to  which  it is a party  and  all  other  agreements  to be
delivered in connection with any thereof.

          (f)  Further  Assurances.  The  Company  shall  execute and deliver to
Sumitomo all such documents and instruments, and do all such acts and things, as
may  reasonably  be  necessary  or required  by  Sumitomo to enable  Sumitomo to
exercise  and  enforce  its rights  under this  Reimbursement  Agreement  and to
realize  thereon,  and record and Me and rerecord and re-file all such documents
and  Instruments,  at such time or times,  in such  manner  and at such place or
places,  all as may be necessary  or required by Sumitomo to validate,  preserve
and protect the position of Sumitomo under this Reimbursement Agreement.

          (g)  Compliance  Certificates.  As soon as  available  and in no event
later than  ninety  (90) days after the close of each of its fiscal  years,  the
Company  will  furnish  to  Sumitomo  certificates  of  compliance  signed by an
Authorized  Representative  of the  Company  (i)  stating  that a review  of the
activities  of the  Company has been made under its  supervision  with a view to
determining  whether the Company has fulfilled all of its obligations under this
Reimbursement  Agreement  and the Related  Documents;  and (ii) stating that the
Company  has  fulfilled  its  obligations  under  such  documents  and  that all
representations  made herein  continue to be true and correct (or specifying the
nature of any  change),  or if any Event of Default or Potential  Default  shall
have  occurred  specifying  such Event of Default or  Potential  Default and the
nature and status thereof.


                                       15

<PAGE>



          (h) Payment of Taxes. The Company shall pay or cause to be paid to the
public officers charged with the collection  thereof promptly as the same become
due, all taxes,  including but not limited to income, profits or property taxes,
which may now or hereafter be imposed by the United States of America, any state
or municipality or any political  subdivision or subdivisions  thereof,  and all
assessments for public improvements or other assessments,  levies, license fees,
charges for publicly  supplied  water or sewer  services,  excises,  franchises,
imposts and charges, general and special,  ordinary and extraordinary (including
interest,  penalties and all costs  resulting from delayed payment of any of the
foregoing) of whatever  name,  nature and kind and whether or not now within the
contemplation  of the parties  hereto which are now or may  hereafter be levied,
assessed,  charged or imposed upon the Company or which are or may become a lien
upon this Reimbursement  Agreement,  the Related Documents, the Project, the use
or  occupation  thereof or upon the owner or occupants in respect of or upon the
basis  of the  rent or the  estate  thereby  created  (in  connection  with  the
Project), or upon any franchises, businesses, transactions, income, earnings and
receipts  (gross,  net or  otherwise)  of the  Company  in  connection  with the
Project, for payment or collection of which the Company is liable or accountable
under  any  lawful  authority  whatever  by reason of  ownership,  occupancy  or
operation of the Project,  or its  earnings,  profits or receipts  from,  or its
leasing  of, the  Project;  provided,  however,  that the  Company  shall not be
required  to pay or  discharge  or  cause  to be paid  or  discharged  any  tax,
assessment,  lien or other matter  hereunder so long as the validity  thereof is
being contested in good faith and by appropriate  legal  proceedings and neither
the Project nor any rent or income therefrom or interest therein would be in any
immediate danger of being sold,  forfeited,  attached or lost. The Company will,
upon request,  provide Sumitomo or the Trustee with copies of any tax returns of
the Company and receipts for payment of taxes.

          (i)  Maintenance  of  Existence.  The Company  shall (i)  preserve and
maintain its  corporate  existence,  rights and  privileges  in the state of its
incorporation and (ii) qualify and remain qualified as a foreign  corporation in
each  jurisdiction  in which the  ownership  of  property  or the  nature of its
business requires such qualification under applicable law.

          (j) Remarketing  Agent. The Company shall at all times engage or cause
to be  engaged  a  Remarketing  Agent to serve as such  under  the  terms of the
Indenture.

          (k) Rebate  Consultant.  The Company shall engage a Rebate  Consultant
acceptable  to  Sumitomo  in  the  event  it or  the  Internal  Revenue  Service
determines that the Bonds are subject to the provisions of Section 147(f) of the
Code.

     Section 4.2 Company's Negative Covenants.  The Company covenants and agrees
with  Sumitomo  that so long as any  amounts  may be drawn  under the  Letter of
Credit  and -  thereafter  so long as any  amounts  remain  outstanding  or Bank
Reimbursement Obligations remain unfulfilled under this Reimbursement Agreement,
the Company will not,  directly or indirectly,  unless  Sumitomo shall otherwise
consent in writing:


                                       16

<PAGE>



          (a) Related Documents.  Agree to amend, extend,  modify, waive, revise
or otherwise alter or terminate any term of the Related Documents.

          (b) Liens,  etc.  Create or suffer to exist any Lien or any other type
of  preferential  arrangement,  upon or with  respect to any of its  Properties,
whether now owned or hereafter acquired,  or assign any right to receive income,
in each  case to secure  any  Indebtedness,  other  than (i) as  created  by the
Related  Documents,  (ii)  imposed by law on any property of the Company such as
landlords',  carriers',  warehousemen's,  mechanics'  and  other  similar  liens
arising in the ordinary  course of its  business,  not to exceed  $25,000 in the
aggregate,  (iii) purchase money liens or purchase money security interests upon
or in any equipment  owned or held by the Company on the date hereof or owned or
held  by the  Company  hereafter  in the  ordinary  course  of its  business  as
conducted on the date hereof to secure the purchase  price of such  equipment or
to  secure  indebtedness  incurred  solely  for the  purpose  of  financing  the
acquisition of such equipment, (iv) Liens existing on such equipment at the time
of its acquisition,  (v)  encumbrances on equipment  leased,  as lessee,  by the
Company  pursuant to a lease permitted by this  Reimbursement  Agreement and the
Related  Documents,  or (vi) any Liens  disclosed  on the  financial  statements
referred to in Section 3. 1 0 hereof.

          (c) Debt.  Create or suffer to exist any  Indebtedness  other than (i)
any  Indebtedness  incurred  under this  Reimbursement  Agreement  or any of the
Related  Documents,  (ii)  Indebtedness  secured by Liens permitted  pursuant to
Section 4.2(b) hereof, (iii) short-term Indebtedness on customary trade terms in
connection  with the  provision  to the  Company  of goods and  services  in the
ordinary  course  of its  business  as  conducted  on the date  hereof,  or (iv)
Indebtedness  disclosed on the financial statements refer-red to in Section 3.10
hereof.

          (d) Change in Business.  Make any material change in the nature of its
business as conducted on the date hereof.

          (e) Consolidations,  etc. Liquidate, consolidate or merge with or into
any other Person, or convey, transfer, lease or otherwise dispose of (whether in
one transaction or in a series of transactions)  all or substantially all of its
assets,  property or interest  (whether  now owned or  hereafter  acquired),  or
acquire all or substantially  all of the assets of any Person,  or engage in any
other similar or unusual action.

          (f) Sales, etc. of Assets. Sell, assign, encumber,  mortgage,  pledge,
lease,  transfer  or  otherwise  dispose of any of its assets or  properties  or
interests  therein  (including,  without  limitation,  all  or any  part  of the
Project), other than as permitted pursuant to Section 4.2(b) hereof.

          (g)  Investments  in Other  Persons.  Make any loan or  advance to any
Person or purchase or otherwise acquire any capital stock,  obligations or other
securities  of, make any capital  contribution  to, or otherwise  invest in, any
Person; provided, however, that nothing

                                       17

<PAGE>



in this subsection shall prevent the Company from purchasing  readily marketable
direct  obligations  of the United States of America  solely in connection  with
routine cash management operations.

          (h) Official  Statement.  Refer to Sumitomo in any  offering  document
(other than the Official Statement) or make any changes in reference to Sumitomo
in any revision of the Official  Statement,  without  Sumitomo's  prior  written
consent thereto.

          (i) Purchase of Stocks.  Extend credit to others for the purpose of to
purchasing" or "carrying" any "margin stock" (as defined in Regulation U) or use
any of the proceeds of the Bonds to (i) "purchase" or "carry" any "margin stock"
or (ii)  acquire  any  security in any  transaction  which is subject to Section
13(d) or made unlawful pursuant to Section 14 of the Securities  Exchange Act of
1934.

          (j) Optional  Redemption  of Bonds.  Permit an optional  redemption of
Bonds under the Indenture without the prior written consent of Sumitomo.  If the
Company  has  deposited  with  Sumitomo  or the  Trustee an amount  equal to the
principal  amount of Bonds to be redeemed  pursuant to the  Indenture,  Sumitomo
shall consent to such optional redemption to the extent of such amounts.

          (k) Remarketing Agent. Remove or replace the Remarketing Agent without
the prior written consent of Sumitomo.

                                    ARTICLE V

                                     DEFAULT

     Section  5.1  Events  of  Default.  The  occurrence  of one or  more of the
following events shall constitute an Event of Default:

          (a) The occurrence of any "Event of Default" or "Default"  under,  and
as defined in, any Credit Document (other than this Reimbursement  Agreement) or
any Bond  Document,  in each case after giving  effect to any  applicable  grace
periods.

          (b)  Default  in the  payment  of any  Bank  Reimbursement  Obligation
required to be paid or  reimbursed  under this  Reimbursement  Agreement  or any
other  Credit  Document  when and as the same is due and  payable  hereunder  or
thereunder.

          (c) Any  representation  or warranty  made by the Company  under or in
connection with this  Reimbursement  Agreement or the other Related Documents or
in any certificate,  agreement,  instrument or statement contemplated by or made
or delivered  pursuant to or in connection  herewith or therewith shall prove to
have been false or misleading in any material respect.

                                       18

<PAGE>




          (d) The breach by the Company (other than a breach that constitutes an
Event of Default  under Section 5.1 clauses (a) through (c) above) of any of the
covenants,  terms and  provisions  contained in Section 4.1(i) or (j) or Section
4.2 hereof.

          (e) The breach by the Company (other than a breach that constitutes an
Event of Default  under  Section 5.1 clauses (a) through (d) above) of any other
covenants,  terms and provisions of this  Reimbursement  Agreement  which is not
remedied within 30 days after written notice to the Company by Sumitomo,  unless
Sumitomo  shall  consent  to any  extension  of  time  for  such  observance  or
performance.

          (f) The Company shall (i) be adjudicated as bankrupt,  or an order for
relief  shall be  entered  against  it under the  federal  bankruptcy  law which
remains  unstayed or is not dismissed  within sixty (60) days after the entry of
such  adjudication  or  order;  (ii)  make  an  assignment  for the  benefit  of
creditors;  (iii) apply for, seek,  consent to, or acquiesce in, the appointment
of a receiver,  custodian, trustee, examiner, liquidator or similar official for
it or any  substantial  part of its  property;  (iv)  institute  any  proceeding
seeking  an order for  relief  under the  federal  bankruptcy  law or seeking to
adjudicate  it as bankrupt or  insolvent,  or seeking  dissolution,  winding up,
liquidation, reorganization, arrangement, adjustment or composition of it or its
debts  under any  federal or state law  relating to  bankruptcy,  insolvency  or
reorganization  or relief of debtors or fail to file an answer or other pleading
denying the material  allegations of any such  proceeding  filed against it; (v)
take any action to authorize or effect any of the foregoing actions set forth in
this Section  5.1(f);  or (vi) fail to contest in good faith any  appointment or
proceeding described in Section 5.1(g).

          (g) Without the  application,  approval or consent of the  Company,  a
receiver,  custodian, trustee, examiner, liquidator or similar official shall be
appointed  for  the  Company  or any  substantial  part  of its  Property,  or a
proceeding  described in Section 5.1(f) shall be instituted  against the Company
and  such  appointment  continues  undischarged  or  such  proceeding  continues
undismissed or unstayed for a period of sixty (60) consecutive days.

          (h) Any court,  government or governmental agency shall condemn, seize
or otherwise  appropriate,  or take custody or control of all or any substantial
portion of the Property of the Company which is material to the operation of the
Company unless the proceeds are used to replace such Property.

          (i) The occurrence of a Determination of Taxability.

          (j) Any material provision of this  Reimbursement  Agreement or any of
the other Related Documents shall cease to be valid and binding,  or the Company
or any governmental authority shall contest any such provision,  or the Company,
or any agent or trustee on behalf of the Company,  shall deny that it has any or
further  liability  under this  Reimbursement  Agreement  or any of the  Related
Documents.

                                       19

<PAGE>



          (k) Any  governmental  body,  authority  or agency  shall  require any
amendment to this Reimbursement Agreement or any of the other Related Documents,
or any modification to any of the parties hereto or thereto,  which amendment or
modification,  in the opinion of Sumitomo,  may materially  adversely affect any
right or remedy of Sumitomo hereunder or thereunder,  or any statute or any rule
or  regulation  of any  governmental  body,  authority  or agency  shall  render
ineffective or shall materially adversely affect any right or remedy of Sumitomo
hereunder or thereunder,  or any such requirement,  statute,  rule or regulation
shall  cause  the  termination  of or  otherwise  materially  affect  any  duty,
liability  or  obligation,  of the  Company to Sumitomo  hereunder  or under the
Related Documents.

          (l) A default shall occur and be continuing beyond any applicable cure
period  under any  agreement  (other  than the  Related  Documents)  between the
Company and Sumitomo or under any obligation owed by the Company to Sumitomo.

          (m) Any material provision of this  Reimbursement  Agreement or any of
the other Related  Documents shall cease to be valid and binding as respects any
party  other  than  Sumitomo;  or any party or any agent or trustee on behalf of
such  party,   shall  deny  that  it  has  any  further   liability  under  this
Reimbursement  Agreement,  or any material provision of any of the other Related
Documents to which it is a party.

     Section 5.2 Remedies.  Upon the occurrence of any Event of Default Sumitomo
may exercise any one or more of the following rights and remedies in addition to
any other remedies herein or by law provided:

          (a) declare the  principal of and  interest on the Bank  Reimbursement
Obligations  owing hereunder  immediately due and payable,  notwithstanding  the
provisions of Section 2.5;

          (b) give  notice  of the  occurrence  of an Event  of  Default  to the
Trustee,  which notice shall  provide that the Letter of Credit shall expire ten
(10) days after  receipt of such notice by the Trustee and  instruct the Trustee
to cause a redemption of the Bonds pursuant to Section 4.01(7) of the Indenture;

          (c) direct the Trustee to exercise its rights under the  Indenture and
the Loan Agreement;

          (d) exercise Sumitomo's rights under the Related Documents,  including
taking sole possession and ownership or control of the Investment  Agreement and
all moneys and investments held thereunder; or

          (e) pursue any other action available at law or in equity.


                                       20

<PAGE>



                                   ARTICLE VI

                         WAIVER, AMENDMENTS AND REMEDIES

     Section 6.1 Waiver and  Amendments.  No delays or  omissions of Sumitomo to
exercise  any right  under the Credit  Documents  shall  impair such right or be
construed to be a waiver of or an acquiescence in any Event of Default,  and any
single or partial exercise of any such right shall not preclude other or further
exercise  of that  right or the  exercise  of any other  right,  and no  waiver,
amendment or other  variation of the terms,  conditions  or  provisions  of this
Reimbursement Agreement shall be valid unless in writing signed by Sumitomo, and
then only to the extent specifically set forth in such writing.

     Section 6.2  Remedies  Cumulative.  All  remedies  contained  in the Credit
Documents or by law afforded  shall be cumulative  and all shall be available to
Sumitomo until the Letter of Credit has expired or been  terminated and the Bank
Reimbursement Obligations have been indefeasibly paid in full.

                                   ARTICLE VII

                              CONDITIONS PRECEDENT

     Section  7.1  Conditions  Precedent  to  Issuance  of Letter of Credit.  As
conditions  precedent  to the  obligation  of  Sumitomo  to issue the  Letter of
Credit, (a) the Company shall provide or cause to be provided to Sumitomo on the
Closing Date, in form and substance satisfactory to Sumitomo and its counsel:

          (i) a written  opinion  of Luce,  Forward,  Hamilton  &  Scripps  LLP,
counsel  to the  Company,  dated the  Closing  Date,  substantially  in the form
attached as Exhibit E;

          (ii) the  written  opinion  of Kutak  Rock,  bond  counsel,  dated the
Closing Date, in form and substance satisfactory to Sumitomo's counsel;

          (iii) a written  opinion of counsel to the  issuer,  dated the Closing
Date,  with  respect to the due  organization  of the  Issuer,  the power of the
Issuer to enter into the  transactions  contemplated by the Bond Documents,  the
due  adoption  of all  proceedings  of the  Issuer  and the  due  authorization,
execution, delivery and enforceability of the Bond Documents to which the Issuer
is a party, in form and substance satisfactory to Sumitomo's counsel;

          (iv) a  certificate  of good  standing  of the Company and a certified
copy of its Certificate of Incorporation, both certified on or within sixty (60)
days  prior to the date of  execution  of this  Reimbursement  Agreement  by the
Secretary of State of

                                       21

<PAGE>



Delaware and a certificate of an Authorized  Officer of the Company stating that
no changes have been made in the Certificate of  Incorporation  or good standing
of the Company since such date;

          (v) a  certificate  of good  standing of the Company,  certified on or
within  sixty (60) days  prior to the date of  execution  of this  Reimbursement
Agreement by the  Secretary of the State of California  and a certificate  of an
Authorized  Officer or the Company stating that no changes have been made in the
good standing of the Company since such date;

          (vi)  copies,  certified  on  the  date  of  execution  hereof  by  an
Authorized  Officer of the Company,  of its by-laws and resolutions  authorizing
the  execution of the Related  Documents  to which the Company is a party,  upon
which Sumitomo shall be entitled to rely until informed of any change in writing
by the Company;

          (vii) an incumbency certificate,  executed by an Authorized Officer of
the Company,  which shall  identify by name and title and bear the signatures of
the  Authorized  Officers of the Company  authorized to sign this  Reimbursement
Agreement  and those  Related  Documents  to which the Company is a party and to
effect the  transactions  under them,  upon which  Sumitomo shall be entitled to
rely until informed of any change in writing by the Company;

          (viii)  copies,  certified  on the  date  of  execution  hereof  by an
Authorized  Officer of the Issuer, of the resolutions of the Issuer  authorizing
the issuance of the Bonds and any other  resolutions  of the Issuer  authorizing
the execution of those Bond Documents to which the Issuer is a party, upon which
Sumitomo  shall be entitled  to rely until  informed of any change in writing by
the Issuer;

          (ix) an incumbency  certificate,  executed by an Authorized Officer of
the Issuer,  which shall  identify by name and title and bear the  signatures of
the Authorized Officers of the Issuer authorized to sign those Bond Documents to
which the  Issuer is a party and to effect the  transactions  under  them,  upon
which Sumitomo shall be entitled to rely until informed of any change in writing
by the Issuer;

          (x) a  certificate  signed by an  Authorized  Officer of the  Company,
dated the Closing Date and stating that:

               (a) the representations  and warranties  contained in Article III
of this  Reimbursement  Agreement  are correct on and as of the Closing  Date as
though made on such date; and

               (b) no Event of Default has occurred and is continuing,  or would
result from the issuance of the Letter of Credit or the execution and delivery

                                       22

<PAGE>



of this Reimbursement Agreement or any Bond Document or Credit Document to which
the  Company  is a party,  and no event has  occurred  and is  continuing  which
constitutes a Potential Default;

               (xi)  true  and  correct  copies  of all  governmental  approvals
necessary for the Issuer to enter into the Bond Documents to which the Issuer is
a party;

               (xii) evidence that the Remarketing  Agent has  acknowledged  and
accepted in writing its appointment as Remarketing Agent under the Indenture and
its duties and obligations thereunder;

               (xiii) the  receipt  of the  facility  fee  payable  pursuant  to
Section  2.2(a)  hereof  and  all  reasonable  costs  (including  the  fees  and
disbursements of Sumitomo's  special and Japanese  counsel)  associated with the
transactions contemplated by this Reimbursement Agreement in lawful money of the
United States of America in freely transferable and immediately available funds;

               (xiv) true and correct copies of the Bond Documents and all other
documents furnished in connection with the issuance and delivery of the Bonds;

               (xv) the  Credit  Documents  (other  than the  Letter of  Credit)
executed and delivered on behalf of the parties thereto;

               (xvi) evidence  satisfactory  to Sumitomo and its special counsel
that the insurance policies required by Section 4. 1 (d) hereof are in fun force
and effect on the Closing Date;

               (xvii)  evidence of filing or  simultaneous  filing of  completed
Uniform Commercial Code financing  statements from the Company in such forms and
in such places as Sumitomo shall require; and

               (xviii) the  receipt of such other  documents,  certificates  and
opinions as Sumitomo or its special counsel may reasonably request;

          (a) no law,  regulation,  ruling or other  action  of any  government,
foreign or  domestic,  or any  political  subdivision  or  authority  therein or
thereof shall be in effect or shall have occurred,  the effect of which would be
to prevent  Sumitomo from  fulfilling its obligations  under this  Reimbursement
Agreement; and

          (b) all legal requirements  provided herein incident to the execution,
delivery  and  performance  of this  Reimbursement  Agreement  and  the  Related
Documents  and the  transactions  contemplated  hereby  and  thereby,  shall  be
reasonably satisfactory to Sumitomo and its counsel.

                                       23

<PAGE>



     Section  7.2  Conditions  Precedent  to Loans.  Following  any  payment  by
Sumitomo  under the Letter of Credit  pursuant  to a drawing  for the payment of
Bonds  tendered  pursuant to Section  4.06 or Section  4.07 of the  Indenture or
Non-Tendered  Bonds which have not been remarketed,  a loan with respect to such
drawing  shall be made  available  to the  Company  only if on the date on which
Sumitomo honors such drawing the following statements shall be true:

          (a) the  representations  and  warranties of the Company  contained in
Article III of this Reimbursement  Agreement and the other Related Documents are
true and correct on and as of the date of such  payment as though made on and as
of such date; and

          (b) no event has occurred and is continuing, or would result from such
payment, which constitutes a Potential Default or an Event of Default.

     Unless the Company  shall have  previously  advised  Sumitomo in writing or
Sumitomo has actual  knowledge  that one or more of the above  statements  is no
longer true,  the Company shall be deemed to have  represented  and warranted on
the date of such payment that the above statements are true and correct.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

     Section  8.1  Survival  of Certain  Representations  and  Obligations.  The
respective  agreements,  representations and other statements of the Company and
Sumitomo and their  respective  partners,  officials or officers set forth in or
made  pursuant to this  Reimbursement  Agreement  will  survive the issuance and
delivery of the Bonds.

     Section 8.2  Governing  Law.  The  obligations  of the Company and Sumitomo
under  this  Reimbursement  Agreement  shall be  governed  by and  construed  in
accordance with the laws of the State.

     Section 8.3 Headings.  Section headings in this Reimbursement Agreement are
for  convenience  of  reference  only and shall not  govern,  or be used in, the
interpretation of any of the provisions of this Reimbursement Agreement.

     Section 8.4 Benefit of Agreement:  Successors.  The terms and provisions of
the  Credit  Documents  shall be  binding  upon and inure to the  benefit of the
Company and Sumitomo and their  respective  successors and assigns,  except that
the Company shall not have the right to assign its rights or delegate its duties
under any of the Credit  Documents,  or any interest in them,  without the prior
written consent of Sumitomo.

     Section  8.5  Costs,  Expenses.  The  Company  agrees to pay on demand  all
reasonable costs and expenses (including  out-of-pocket  expenses) in connection
with the preparation, execution,

                                       24

<PAGE>



delivery and  administration  of the Credit  Documents  and any other  documents
which may be  delivered  in  connection  with the Credit  Documents,  including,
without  limitation,  the reasonable fees and out-of-pocket  expenses of counsel
for Sumitomo  with respect  thereto and with respect to advising  Sumitomo as to
its  rights  and  responsibilities  under  the  Credit  Documents  and the  Bond
Documents and all costs and expenses in connection  with the  enforcement of the
Credit  Documents and the Bond Documents and such other  documents  which may be
delivered in  connection  herewith  and  therewith  and agrees to save  Sumitomo
harmless from and against any and all  liabilities  with respect to or resulting
from any  delay by the  Company  in  paying  or  omission  to pay such  fees and
expenses.

     Section  8.6 Entire  Agreement.  The  Related  Documents  embody the entire
agreement and  understanding  between the Company and Sumitomo and supersede all
prior agreements between the Company and Sumitomo relating to the subject matter
of this Reimbursement Agreement.

     Section 8.7 Termination.  This Reimbursement Agreement shall terminate upon
the  later  to  occur of the  Expiration  Date or the  date of the  indefeasible
payment in full of all of the Bank Reimbursement Obligations.

     Section 8.8 Execution in Counterparts.  This Reimbursement Agreement may be
executed in multiple counterparts, each of which shall be an original and all of
which shall constitute but one and the same instrument.

     Section 8.9 Set-Off.  In addition to, and without limitation of, any rights
of Sumitomo under  applicable law, if any Event of Default or Potential  Default
occurs,  any indebtedness from Sumitomo to the Company (including the Investment
Agreement but excluding any trust  accounts and other  security and cash held in
an agency capacity  pursuant to a written  agreement with respect to such agency
or trust capacity  between  Sumitomo and the Company) may be set-off and applied
toward payment of the Bank  Reimbursement  Obligations,  whether or not the Bank
Reimbursement Obligations, or any part of them, shall then be due.

     Section 8.10 Severability. If any provision of this Reimbursement Agreement
shall be held invalid or unenforceable  by any court of competent  jurisdiction,
such holding shall not invalidate or render unenforceable any other provision of
this Reimbursement Agreement.

     Section 8.11 Notices.  Unless otherwise  provided for in this Reimbursement
Agreement, any notice required or permitted to be given under this Reimbursement
Agreement  may  be  given  by  certified  or  registered  mail,  return  receipt
requested, or by telex or telecopy,  charges prepaid, or by commercial overnight
delivery service, prepaid, addressed:


                                       25

<PAGE>



         To the Company as follows:

                  Advanced Aerodynamics and Structures, Inc.
                  3501 Lakewood Boulevard
                  Long Beach, California  90808
                  Attention:  Carl L. Chen, Ph.D.
                  Telecopy:  (562) 938-8620
                  Telephone:  (562) 938-8618

         To Sumitomo as follows:

                  The Sumitomo Bank, Limited
                  Los Angeles Branch
                  777 South Figueroa Street, Suite 2600
                  Los Angeles, California 90017
                  Attention:  Manager - Structured Finance
                              and Financial Institutions Group
                  Telecopy:  (213) 623-6832
                  Telephone:  (213) 955-0800

         To the Trustee as follows:

                  First Trust of California, National Association
                  One California Street, Fourth Floor
                  San Francisco, California 94111
                  Attention:  Corporate Trust Department
                  Telecopy:  (415) 273-4590
                  Telephone:  (415) 273-4576

Any  notice  sent by mail  shall be  deemed  given  three  (3) days  after it is
deposited  in the mails.  Any notice sent by telex or  telecopy  shall be deemed
given when confirmed by telex answerback or sent, respectively.  Any notice sent
by commercial  overnight delivery service shall be deemed given one (1) Business
Day after it is deposited  for  delivery.  Each party may change the address for
service of notice upon it by a notice in writing to the other.

                                   ARTICLE IX

                               WAIVER OF LIABILITY

     Sumitomo shall not be responsible for: (a) the use which may be made of the
Letter  of  Credit or for any acts or  omissions  of the users of the  Letter of
Credit;  (b) the validity,  sufficiency,  accuracy or  genuineness  of documents
presented  under  or in  connection  with the  Letter  of  Credit,  even if such
documents should in fact prove to be in any or all respects invalid,  fraudulent
or forged; (c) payment

                                       26

<PAGE>



by  Sumitomo to the Trustee or any  transferee  of the Letter of Credit  against
presentation  of  documents  which do not comply with the terms of the Letter of
Credit,  including  failure of any  documents to bear any  reference or adequate
reference  to the Letter of Credit;  or (d)  delivery  of any  messages by mail,
cable, telegraph or otherwise, whether or not they may be in cipher; except only
that the Company may have a claim against Sumitomo and Sumitomo may be liable to
the  Company to the  extent,  but only to the extent of any direct as opposed to
consequential  damages  suffered  by the Company  which the Company  proves were
caused by (i) Sumitomo's  willful  misconduct or gross negligence in determining
whether  documents  presented  under the Letter of Credit  comply with the terms
thereof or (ii)  Sumitomo's  failure to pay under the Letter of Credit after the
presentation to it by the Trustee of a draft and certificate  strictly complying
with the terms and conditions of the Letter of Credit.  The happening of any one
or  more of the  contingencies  referred  to in the  preceding  clauses  of this
Article IX shall not affect,  impair or prevent the vesting of any of Sumitomo's
rights or powers hereunder,  or the Company's  obligation to make reimbursement.
In  furtherance  and extension and not in limitation of the specific  provisions
set forth above,  the Company  agrees that any action taken by Sumitomo under or
in connection  with the Letter of Credit or the related drafts or documents,  if
taken in good faith,  shall be binding on the Company and shall not put Sumitomo
under any resulting  liability to the Company and the Company thereby makes like
agreement  as to any  inaction or omission  unless in breach of good faith.  The
Company  acknowledges  that the Letter of Credit shall be transferable and it is
understood  and agreed that  Sumitomo is under no duty to  determine  the proper
identity of any one appearing in the draft or documents as transferee, nor shall
Sumitomo  be charged  with  responsibility  of any nature or  character  for the
validity or correctness of any transfer or successive transfers,  and payment by
Sumitomo  to any  purported  transferee  as  reasonably  determined  by Sumitomo
pursuant to the terms of the Letter of Credit is hereby authorized and approved,
and the Company further agrees to hold Sumitomo harmless and indemnified against
any liability or claim in connection with or arising out of the foregoing.

                                    ARTICLE X

                                 INDEMNIFICATION

     The  Company  hereby  indemnifies  and  holds  harmless  Sumitomo  and  its
officers,  directors,  employees  and  attorneys  from and  against  any and all
claims,  damages,  losses,  liabilities  and reasonable  costs or expenses which
Sumitomo  may incur (or which may be claimed  against  Sumitomo by any entity or
entities whatsoever) by reason of or in connection with: (i) the issuance,  sale
or resale of the  Bonds;  (ii) any  provision,  misstatement  or  omission  of a
material  fact  contained  in (or not  contained  in,  as the  case  may be) any
document  pursuant  to which  the  Bonds  are  offered  for sale or are sold (or
resold),  except any  provision,  misstatement  or omission  contained in or not
contained  under the caption  "The Bank" in the  Official  Statement;  (iii) the
execution  and delivery or transfer of, or payment or failure to pay under,  the
Letter of Credit, except for any claims, damages, losses, liabilities,  costs or
expenses to the extent,  but only to the extent,  caused by the gross negligence
or willful  misconduct of Sumitomo in  determining  whether a statement or draft
presented  under the Letter of Credit  complied  with the terms of the Letter of
Credit or Sumitomo's willful failure to pay under the Letter of Credit after the
proper presentation of a certificate or draft strictly complying with

                                       27

<PAGE>



the terms and  conditions  of the  Letter of Credit;  and (iv) any other  action
taken by  Sumitomo  in  connection  with the  transactions  contemplated  by the
Related Documents, except for any claims, damages, losses, liabilities, costs or
expenses to the extent,  but only to the extent,  caused by the gross negligence
or willful misconduct of Sumitomo.

     The  Company  agrees  that  its  obligations,   covenants  and  liabilities
hereunder  shall  survive the  execution  of each of the Credit  Documents,  and
continue  in full  force and  effect  and shall not be  terminated,  discharged,
released,  in whole or in part,  affected  or impaired by any act of Sumitomo or
any event or condition.  The Company agrees that its liability  hereunder  shall
not be  discharged  by: (i) the renewal or  extension of time for the payment of
the Bank  Reimbursement  Obligations  under any of the Credit  Documents  or any
other agreement  relating to the Bank  Reimbursement  Obligations,  whether made
with or without the  knowledge  or consent of the  Company;  (ii) any  transfer,
waiver, compromise,  settlement,  modification,  surrender, or release of any of
the Bank  Reimbursement  Obligations;  (iii) the  existence  of any  defenses to
enforcement of any of the Credit Documents; (iv) any failure, omission, delay or
inadequacy,  whether entire or partial, of Sumitomo to exercise any right, power
or remedy regarding the Bank Reimbursement  Obligations or to enforce or realize
upon (or to make any guarantor a party to the  enforcement or realization  upon)
any of  Sumitomo's  security  for the Bank  Reimbursement  Obligations;  (v) the
existence  of  any  set-off,   claim,  reduction,  or  diminution  of  the  Bank
Reimbursement  Obligations,  or any  defense  of any kind or  nature,  which the
Company may have  against  the Company or which any party has against  Sumitomo;
(vi) the application of payments  received from any source to the payment of any
obligation other than the Bank Reimbursement  Obligations,  even though Sumitomo
might  lawfully  have  elected to apply such  payments to any part or all of the
Bank Reimbursement Obligations;  (vii) the addition,  deletion or release of any
and all other  borrowers,  endorsers,  guarantors,  obligors  and other  persons
liable for the payment of the Bank Reimbursement  Obligations and the acceptance
of any  and all  other  security  for  the  payment  of the  Bank  Reimbursement
Obligations;  (viii) any change in the manner,  place or terms of payment of any
of the Bank Reimbursement Obligations; and (ix) any act or failure to act in any
manner  referred  to  herein  which  may  deprive  the  Company  of its right to
subrogation  against the Company to recover full indemnity for any payments made
pursuant  hereto;  all  whether  or not the  Company  shall  have had  notice or
knowledge  of any act or  omission  referred  to in the  foregoing  clauses  (i)
through (ix) of this Paragraph.  The Company intends that it shall remain liable
hereunder as a principal even if all of the Bank Reimbursement Obligations shall
have been paid in full, notwithstanding any fact, act, event or occurrence which
might  otherwise  operate  as a legal or  equitable  discharge  of a  surety  or
guarantor.



                                       28

<PAGE>



     IN WITNESS  WHEREOF,  the parties  hereto  have  caused this  Reimbursement
Agreement  to be duly  executed  and  delivered  by  their  respective  officers
hereunto duly authorized as of the date first above written.


                                        ADVANCED AERODYNAMICS AND
                                        STRUCTURES, INC.


                                         By:
                                              President


ATTEST:



By:
    Secretary

(SEAL)


                                         THE SUMITOMO BANK, LIMITED



                                          By:
                                                         , Los Angeles Branch









                                       29

<PAGE>



     IN WITNESS  WHEREOF,  the parties  hereto  have  caused this  Reimbursement
Agreement  to be duly  executed  and  delivered  by  their  respective  officers
thereunto duly authorized as of the date first above written.


                                         ADVANCED AERODYNAMICS AND
                                         STRUCTURES, INC.



                                          By:
                                                 President

ATTEST:



By:
     Secretary

(SEAL)

                                          THE SUMITOMO BANK, LIMITED



                                          By:
                                             Joint General Manager, Los Angeles
                                             Branch





                                       30

<PAGE>





                                    EXHIBIT A
                            Form of Letter of Credit




                          IRREVOCABLE LETTER OF CREDIT




Letter of Credit No. G/LA-400557                                 August 5, 1997



First Trust of California, National Association
  not individually but solely as Trustee
One California Street, Fourth Floor
San Francisco, California  94111

Attention:  Corporate Trust Department

Ladies and Gentlemen:

     We hereby issue in your favor, not individually, but solely as Trustee (the
"Trustee")  under  the  Indenture  of Trust  dated as of  August  1,  1997  (the
"Indenture")  between the California  Economic  Development  Financing Authority
(the  "Issuer")  and you,  this  irrevocable  direct pay letter of credit  (this
"Letter of Credit") in an amount not exceeding $8,625,754 (the "Stated Amount"),
of which an amount not  exceeding  $8,500,000  may be drawn upon with respect to
the  payment of  principal  of the  Issuer's  $8,500,000  Variable  Rate  Demand
Industrial  Development  Revenue Bonds,  Series 1997 (Advanced  Aerodynamics and
Structures, Inc. Project) (the "Bonds") and an amount not exceeding $125,754 may
be drawn upon with respect to the payment of up to forty-five (45) days' accrued
interest  (at the rate of 12% per annum  based on a 365-day  year) on the Bonds,
for payment of your draft, drawn at sight on The Sumitomo Bank, Limited,  acting
through its Los Angeles Branch (the "Bank"),  777 South Figueroa  Street,  Suite
2600, Los Angeles,  California 90017 (or such other address in the United States
of America as may be designated to you in waiting from time to time by the Bank)
accompanied   by  your   signed   certificate   (with  the   blanks   filled  in
appropriately):

     1. if the drawing is being made with  respect to the  payment or  provision
for payment of interest on the Bonds,  whether for regularly  scheduled interest
payments  pursuant to Section 2.02 of the  Indenture or for accrued  interest on
Bonds subject to optional or mandatory  redemption pursuant to Article IV of the
Indenture or upon the  acceleration of the Bonds pursuant to Section 7.01 of the
Indenture, your certificate in the form attached as Annex I;

                                       A-1

<PAGE>



     2. if the drawing is being made with  respect to the  payment of  principal
upon an optional or mandatory  redemption of Bonds pursuant to Article IV of the
Indenture  or upon the  maturity of the Bonds  pursuant  to Section  2.02 of the
Indenture or upon the  acceleration of the Bonds pursuant to Section 7.01 of the
Indenture, your certificate in the form attached as Annex II;

     3. If the  drawing  is made with  respect  to the  payment  of the  accrued
interest and the principal  portion of the purchase  price of Bonds  tendered or
deemed to have been  tendered  pursuant to Section  4.06 or Section  4.07 of the
Indenture,  your  certificate  in the form attached as Annex III (any such draft
accompanied  by such  signed  certificate  is herein  referred to as a "Purchase
Price Draft").

     More than one demand for payment may be made under this Letter of Credit. A
demand for payment  with  respect to the payment of interest on or  principal of
the Bonds  shall not  exceed  that  portion of the Stated  Amount  allocated  to
interest or principal,  respectively,  as the same is reduced or reinstated from
time to time as provided below.

     The expiration date of this Letter of Credit (the "Expiration  Date") shall
be the  earliest  of: (i) our close of business  on August 5, 2002 (the  "Stated
Expiration  Date"),  unless the Stated Expiration Date has been extended and the
Stated Amount adjusted (if  appropriate) by an instrument  substantially  in the
form of  Attachment  C hereto  (which  forms an integral  part of this Letter of
Credit);  (ii) ten (10) days after you receive  notice from the Bank of an Event
of Default  under (and as defined in) the  Reimbursement  Agreement  dated as of
August  1,  1997  between  Advanced  Aerodynamics  and  Structures,   Inc.  (the
"Company") and the Bank (the "Reimbursement Agreement") and a direction to cause
a redemption of all  outstanding  Bonds under the terms of the Indenture;  (iii)
the date on which the Bank  receives  notice  from you that all Bonds  have been
paid in full or such payment has been provided for in accordance  with the terms
of the  Indenture;  (iv)  the date on  which  the  Bonds  become  secured  by an
Alternate  Letter of Credit (as defined in the Indenture) in accordance with the
terms of the Indenture; and (v) the date on which the interest rate on the Bonds
is  converted  to a fixed rate of interest in  accordance  with the terms of the
Indenture.  You  shall  surrender  this  Letter  of  Credit  to the  Bank on the
Expiration Date of this Letter of Credit.

     A draft and  completed  signed  certificate  (other  than a Purchase  Price
Draft)  presented prior to 9:00 a.m., Los Angeles,  California  time, on any day
except Saturday,  Sunday or any day on which banking institutions located in the
Cities of New York, New York or Los Angeles, California or the city in which the
principal  office of the  Trustee or the  Remarketing  Agent (as  defined in the
Indenture) is located  (initially,  San Francisco,  California)  are required or
authorized  by law to close or a day on which  the New York  Stock  Exchange  is
closed (a  "Business  Day") shall be honored and the amount of the draft paid in
immediately  available funds by 1:00 p.m., Los Angeles,  California time) on the
same Business Day,  provided  that such draft and signed  certificate  presented
conform  to the terms and  conditions  of this  Letter  of  Credit.  A draft and
completed signed certificate (other than a Purchase Price Draft) presented after
9:00 a.m., Los Angeles, California time on any Business Day shall be honored and
the amount of the draft paid in  immediately  available  funds by 11:00 a.m. Los
Angeles,  California  time,  on the following  Business Day,  provided that such
draft and signed

                                       A-2

<PAGE>



certificate  presented  conform to the terms and  conditions  of this  Letter of
Credit.  A Purchase  Price  Draft  presented  prior to 9:00 a.m.,  Los  Angeles,
California  time,  on any  Business  Day shall be honored  and the amount of the
draft paid in immediately available funds by 1:00 p.m., Los Angeles,  California
time on the same Business Day, provided that such Purchase Price Draft presented
conforms to the terms and conditions of this Letter of Credit.  A Purchase Price
Draft  presented  after 9:00 a.m., Los Angeles,  California time on any Business
Day shall be honored and the amount of the draft paid in  immediately  available
funds by 11:00 a.m., Los Angeles, California time on the following Business Day,
provided that such draft and signed  certificate  presented conform to the terms
and  conditions  of this Letter of Credit.  Payment  under this Letter of Credit
shall be made in  accordance  with the  payment  instructions  set  forth in the
completed  certificate  accompanying  each draft.  All payments made by the Bank
under this Letter of Credit shall be made from the Bank's own funds  without any
requirement  that the  Trustee,  the  holders  of the Bonds or the Bank make any
prior claims  against the Company and not out of any funds of the  Company,  the
Issuer or any entity  related to either of them.  By the time set forth above on
the  Business  Day  such  payment  is due the  Bank  shall  enter  such  payment
instructions  on the  Federal  Reserve  wire  or,  in  the  event  such  payment
instructions  specify an account  maintained with the Bank,  credit such account
with immediately available funds.

     Any draft or  certificate  may be presented in person to the Bank or may be
sent to the Bank by  telecopier  or  other  electronic  communication,  promptly
confined by telephone at (213) 955-0800, Attention: Manager - Structured Finance
and Financial  Institutions  Group,  to telecopy  number (213) 623-6832 (or such
other  telecopy or telephone  number as may be designated to you in writing from
time to time by the Bank).  Any such draft or certificate  presented by telecopy
or other  electronic  communication  shall be mailed or delivered to the Bank on
the same day to our office  specified  in the first  paragraph of this Letter of
Credit.

     This  Letter of Credit is  successively  transferable  only to a  successor
paying agent upon receipt by the Bank of prior  written  notice of such transfer
in accordance  with Attachment A (which forms an integral part of this Letter of
Credit),  acknowledged by a purported officer of the Trustee and the transferee,
addressed to the Bank and certifying that the transferee is a successor  trustee
under the Indenture.

     Each  payment of a draft  with  respect to the  payment of  interest  on or
principal of the Bonds honored by the Bank shall, pro tanto, reduce that portion
of the  Stated  Amount  available  under  this  Letter  of  Credit,  subject  to
reinstatement as provided below.  Following the honoring of a drawing  hereunder
to pay regularly scheduled principal of the Bonds or principal of the Bonds upon
an optional or  mandatory  redemption  of the Bonds,  that portion of the Stated
Amount  available  under  this  Letter of Credit to pay  interest  shall also be
reduced to an amount equal to  forty-five  (45) days'  accrued  interest (at the
rate of  interest  of 12% per annum  based on a 365-day  year) on the  principal
amount of the remaining  outstanding Bonds (other than Pledged Bonds (as defined
in the Reimbursement Agreement)).  In addition, the Stated Amount of this Letter
of Credit  shall also be reduced  by the  amount  stated in a written  notice of
reduction  executed by a purported  officer of the Trustee  substantially in the
form of Attachment B (which forms an integral part of this Letter of

                                       A-3

<PAGE>



Credit).  A  reduction  of the Stated  Amount  through the use of such a written
notice of  reduction  shall be effective as of the actual date of receipt by the
Bank of such notice at its above-stated address.

     The Stated Amount shall be reinstated as follows:

     (a) Following the honoring of a drawing under this Letter of Credit for the
payment  of the  purchase  price of  Bonds  tendered,  or  deemed  to have  been
tendered,  to the  Trustee or the  Tender  Agent (as  defined in the  Indenture)
pursuant to Section 4.06 or Section  4.07 of the  Indenture,  the Stated  Amount
shall be reinstated  automatically  and immediately  upon and to the extent that
you have received payment in immediately available funds of the principal of and
accrued interest on the Pledged Bonds in connection with the remarketing thereof
and are holding such  payment for the Bank's sole  benefit and account;  in such
case, (i) the principal  portion of this Letter of Credit shall be reinstated in
an amount equal to the  principal  amount of the  remarketed  Bonds and (ii) the
interest portion shall be reinstated to an amount equal to forty-five (45) days'
accrued interest on the Bonds outstanding (other than Pledged Bonds), calculated
at the rate of 12% per annum based on a 365-day year.  In connection  therewith,
you shall wire  transfer  such  payment to the Bank  immediately  after  receipt
thereof and you shall send to the Bank your telecopy  (promptly followed by mail
delivery) notifying the Bank of such payment.

     (b)  Inunediately  following the honoring of a drawing  hereunder to make a
regularly  scheduled interest payment on the Bonds (that is, other than interest
in connection with an optional  redemption or mandatory  redemption of the Bonds
in whole or in part or an  acceleration  or optional or mandatory  tender of the
Bonds)  in an  amount  set  forth  in the  certificate  in the  form of  Annex I
submitted in conjunction with such drawing, the Bank's obligation hereunder with
respect to the payment of interest on the Bonds will be automatically reinstated
by the amount of such drawing.

     (c)  The  principal  and  interest  portions  of the  Stated  Amount  shall
otherwise be reinstated as the Bank may from time to time notify you in writing.

     The Sumitomo Bank,  Limited  acknowledges and agrees,  notwithstanding  any
terms or provisions of this Letter of Credit or the  Reimbursement  Agreement to
the contrary, that this Letter of Credit is in all respects an obligation of The
Sumitomo Bank, Limited,  binding and enforceable against its properties,  assets
and revenues wherever located.

     This  Letter  of  Credit  shall be  governed  by the  laws of the  State of
California  including without  limitation,  Article 5 of the Uniform  Commercial
Code as in effect in the State of California,  as supplemented by the provisions
(to the extent such provisions are consistent with this Letter of Credit) of the
Uniform   Customs  and  Practice  for   Documentary   Credits  (1993   Revision)
International Chamber of Commerce, Publication No. 500 (the "Uniform Customs").


                                       A-4

<PAGE>



     We  undertake  that your draft and  certificate  drawn and  presented on or
before the time of expiration  of this Letter of Credit in  conformity  with the
terms of this Letter of Credit will be duly honored.


                                       Very truly yours,

                                       THE SUMITOMO BANK, LIMITED


                                        By:
                                                           , Los Angeles Branch




                                       A-5

<PAGE>



ANNEX I (INTEREST DRAW) to
Transferable  Irrevocable  Direct  Pay Letter of Credit  Issued by The  Sumitomo
Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

     We refer to  Transferable  Irrevocable  Direct  Pay  Letter of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

     1. As the Trustee pursuant to the Indenture, in trust for the owners of the
Bonds,  we hereby make  demand for payment  under the Letter of Credit to pay or
provide for the  payment of unpaid  interest  on such Bonds in  connection  with
either a  regularly  scheduled  interest  payment,  an  optional  redemption,  a
mandatory  redemption or  acceleration  of the Bonds.  Such Bonds have been duly
authenticated under and in accordance with the Indenture.

     2.  Interest  on the Bonds is now or will under the terms of the  Indenture
become due and payable on or prior to the regularly  scheduled  interest payment
date,  maturity  date or redemption  date of the Bonds and the aggregate  amount
required   to  pay  or  to   provide   for   the   payment   of  the   same   is
$____________________ and payment of such amount is hereby demanded.

     3. The amount  demanded  does not exceed the amount  available  today to be
drawn  under the Letter of Credit in respect of the  payment of  interest on the
Bonds.

     4. Upon receipt of the amount demanded under this Letter of Credit, we will
apply the same directly to the payment when due of interest  owing on account of
the Bonds.


                                       A-6

<PAGE>



     5. [Please wire the amount demanded hereunder to account no.  _____________
at _____________ in _______.] [Please credit account no. _______ maintained with
you.]

         Dated as of ______________, 19__.


                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.


                                         By:
                                         Title:







                                       A-7

<PAGE>





ANNEX II (PRINCIPAL DRAW) to
Transferable  Irrevocable  Direct  Pay Letter of Credit  Issued by The  Sumitomo
Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

     We refer to  Transferable  Irrevocable  Direct  Pay  Letter of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

     1. As the Trustee pursuant to the Indenture, in trust for the owners of the
Bonds,  we hereby make demand for payment  under the Letter of Credit to pay all
or a portion of the unpaid  principal  amount of such Bonds which have been duly
authenticated  under and in accordance  with the  Indenture in  connection  with
either an  optional  redemption,  a  mandatory  redemption  or upon  maturity or
acceleration of the Bonds.

     2.  Principal on the Bonds is now or will under the terms of the  Indenture
become due and payable on or prior to the maturity  date or  redemption  date of
the Bonds;  the  drawing in the  amount of  $_________  is being made to pay the
principal  portion  of each  such  Bond and  payment  of such  amount  is hereby
demanded.

     3. The amount  demanded  does not exceed the amount  available  on the date
hereof to be drawn  under the  Letter of Credit in  respect  of the  payment  of
principal on the Bonds.

     4. Upon receipt of the amount demanded under this Letter of Credit, we will
apply the same directly to the payment of the principal  owing on account of the
Bonds.

     5. The Stated Amount of the Letter of Credit shall be  permanently  reduced
by the amount of the draw hereunder.


                                       A-8

<PAGE>



     6. [Please wire the amount demanded  hereunder to account no.  _________ at
________________  in _____.] [Please credit account no. _______  maintained with
you.]

     Dated as of ______________, 19__.


                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.


                                         By:
                                         Title:



                                       A-9

<PAGE>



ANNEX III (PURCHASE PRICE DRAW) to

Transferable  Irrevocable  Direct  Pay Letter of Credit  Issued by The  Sumitomo
Bank, Limited, acting through its Los Angeles Branch

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California  90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

     We refer to  Transferable  Irrevocable  Direct  Pay  Letter of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit"). Terms defined in the Letter of Credit and not otherwise defined herein
shall have the same meanings herein as therein.

     1. As the  Trustee  pursuant  to the  Indenture,  we hereby make demand for
payment under the Letter of Credit to pay a part or all of the interest  portion
and the principal  portion of the purchase  price to be paid in respect of Bonds
which have been duly  authenticated  under and in accordance  with the Indenture
and which have been  tendered or were deemed to have been  tendered  pursuant to
Section 4.06 or Section 4.07 of the Indenture and for which remarketing proceeds
have not been received.

     2. The  drawing  in the  aggregate  amount  of $ is  being  made to pay the
purchase  price of Bonds  which have been  tendered  or were deemed to have been
tendered.  Such  aggregate  amount  equals the sum of the  amounts  set forth in
paragraphs 3 and 5 below.

     3. The portion of the drawing equal to $ is being made to pay a part or all
of the  interest  portion of the  purchase  price of such Bonds  which have been
tendered or were deemed to have been tendered and for which remarketing proceeds
have not been  received  corresponding  to the  accrued  interest  thereon,  and
payment of such amount is hereby demanded.

     4. Upon  receipt of the amount set forth under  paragraph 3 above,  we will
apply the same directly to the payment of a part or all of the interest  portion
of the amount to be paid in respect of the Bonds.

     5. The portion of the drawing equal to $ is being made to pay the principal
portion of the  purchase  price of such Bonds  which have been  tendered or were
deemed to have been  tendered and for which  remarketing  proceeds have not been
received, and payment of such amount is hereby demanded.

                                      A-10

<PAGE>



     6. Upon  receipt of the amount set forth under  paragraph 5 above,  we will
apply the same directly to the payment of the principal  portion of the purchase
price to be paid in respect of the Bonds.

     7. The amount set forth under  paragraph 3 above does not exceed the amount
available  on the date  hereof to be drawn under the Letter of Credit in respect
of the payment of interest on the Bonds and the amount set forth under paragraph
5 above  does not exceed the  amount  available  on the date  hereof to be drawn
under the Letter of Credit in respect of the payment of principal on the Bonds.

     8. [Please wire the amount demanded  hereunder to account no.  ____________
at  _______________  in  __________.]  [Please  credit  account  no.  __________
maintained with you.]

         Dated as of ____________, 19__.


                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture.

                                        By:
                                        Title:



                                      A-11

<PAGE>



                    ATTACHMENT A TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                             (Transfer Certificate)
                                                               _________,19__
The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group
Gentlemen:

    We refer to  Transferable  Irrevocable  Direct  Pay  Letter  of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series 1997 (Advanced Aerodynamics and Structures, Inc. Project) (the "Letter of
Credit").

    The  undersigned  is the Trustee  referred to in the Letter of Credit and we
hereby give you notice that  _________________  is the  successor  Trustee  (the
"Successor  Trustee")  under the Indenture  referred to in the Letter of Credit,
and that the Successor  Trustee shall succeed to all the rights and  obligations
of the Trustee under the Letter of Credit.

    Upon payment to you of a $2,000  transfer fee by Advanced  Aerodynamics  and
Structures,  Inc., your consent to the transfer of the Letter of Credit with the
date  thereof  to be  confirmed  by a  Notary  Public  in  Japan  (or  otherwise
officially  established) pursuant to the laws of Japan and receipt by us of your
acknowledgment  and  acknowledgment by the Successor Trustee of this notice, the
Letter of Credit  shall be deemed  to have  been  transferred  to the  Successor
Trustee.

                                         Very truly yours,

                                         First Trust of California, National 
                                         Association

                                         By:
                                         Title:

Agreed and Accepted:                     Acknowledged:

The Sumitomo Bank, Limited,              [Name of Successor Trustee]
acting through its
Los Angeles Branch

By:                                      By:
  
Title:                                   Title:

Date:                                    Date:


                                      A-12

<PAGE>



                    ATTACHMENT B TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                             (Reduction Certificate)


                                                         _______________, 19__

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

    We refer to  Transferable  Irrevocable  Direct  Pay  Letter  of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series  1997  (Advanced   Aerodynamics   and   Structures,   Inc.   Project)  by
___________________  Dollars  ($___________).  This  reduction in Stated  Amount
shall go to reduce that portion of the Stated  Amount  allocated to  (principal,
interest)* relating to the Bonds and shall be effective as of the actual date of
receipt of this  instrument  by The Sumitomo  Bank,  Limited.  Accordingly,  the
Stated  Amount of the Letter of Credit  after  giving  effect to such  reduction
shall be _________________  Dollars ($___________).  It is acknowledged that the
amount of such  reduction  shall no longer be  available  for  payment of drafts
under the Letter of Credit.  All terms used in this instrument which are defined
in the Letter of Credit shall have the same meaning in this instrument as in the
Letter of Credit.

                                        First  Trust  of  California,   National
                                        Association,  not in its  individual  or
                                        corporate   capacity,   but   solely  as
                                        Trustee under the Indenture  referred to
                                        in the Letter of Credit.


                                         By:
                                         Title:





- ------------------
 *Complete as appropriate.

                                      A-13

<PAGE>



                    ATTACHMENT C TO TRANSFERABLE IRREVOCABLE
                           DIRECT PAY LETTER OF CREDIT
                              (Notice of Extension)


                                                             ____________, 19__

The Sumitomo Bank, Limited (Los Angeles Branch)
777 South Figueroa Street, Suite 2600
Los Angeles, California  90017

Attention:        Manager - Structured Finance and
                  Financial Institutions Group

Gentlemen:

     We refer to  Transferable  Irrevocable  Direct  Pay  Letter of  Credit  No.
G/LA-400557 issued in support of the $8,500,000  California Economic Development
Financing  Authority Variable Rate Demand Industrial  Development Revenue Bonds,
Series  1997  (Advanced  Aerodynamics  and  Structures,  Inc.  Project),  in the
original Stated Amount of $8,625,754 (the "Letter of Credit").  We hereby notify
you that, in accordance  with the terms of the Letter of Credit and that certain
Reimbursement   Agreement  dated  as  of  August  1,  1997,   between   Advanced
Aerodynamics and Structures, Inc. and us, the Stated Expiration Date (as defined
in the  Letter  of  Credit)  of the  Letter  of  Credit  has  been  extended  to
______________.

     The portions of the Stated Amount of the Letter of Credit  available to pay
principal and interest on the Bonds are  $______________  and  $_______________,
respectively, and the Stated Amount is $______________.

     This  letter  should be  attached  to the  Letter of Credit and made a part
thereof.

                                        THE SUMITOMO BANK, LIMITED LOS
                                        ANGELES BRANCH

 
                                        By:
                                        Its:


                                      A-14

<PAGE>



                                    EXHIBIT B

                              INVESTMENT AGREEMENT


     THIS INVESTMENT  AGREEMENT (this "Investment  Agreement"),  dated August 5,
1997  is by  and  between  ADVANCED  AERODYNAMICS  AND  STRUCTURES,  INC.  ("the
Company"),  and THE SUMITOMO BANK,  LIMITED (the "Bank"),  acting by and through
its Los Angeles Branch.

                                   WITNESSETH:

     WHEREAS,  the  California  Economic  Development  Financing  Authority (the
"Issuer") has issued its Variable  Rate Demand  Industrial  Development  Revenue
Bonds,  Series, 1997 (Advanced  Aerodynamics and Structures,  Inc. Project) (the
"Bonds")  in  the  aggregate  principal  amount  of  $8,500,000  pursuant  to an
Indenture  of Trust  dated as of August 1, 1997 (the  "Indenture")  between  the
Issuer and First Trust of California, National Association (the "Trustee"); and

     WHEREAS,  the Bank has agreed to issue its Irrevocable Letter of Credit No.
G/LA-400557  dated August 5, 1997 (the "Letter of Credit") to secure  payment of
principal  of,  interest  on and  purchase  price of,  the Bonds  pursuant  to a
Reimbursement   Agreement  dated  as  of  August  1,  1997  (the  "Reimbursement
Agreement") between the Bank and the Company; and

     WHEREAS,  to induce  the Bank to issue the  Letter of Credit and secure the
obligations of the Company to the Bank under the  Reimbursement  Agreement,  the
Company  has agreed to deposit  certain  moneys  with the Bank  pursuant to this
Investment Agreement;

     NOW,  THEREFORE,  in  consideration  of the  foregoing  and  of the  mutual
covenants  hereinafter  set forth,  the parties  intending  to be legally  bound
hereby agree as follows:

     Section 1. Invested Funds.  The Company hereby  establishes this Investment
Agreement  with  the  Bank  and  agrees  that,  pursuant  to the  terms  of this
Investment  Agreement,  the Company  shall  invest  with the Bank the  aggregate
amount of $8,500,000  (the  "Invested  Funds").  The Company agrees to cause the
Invested  Funds to be  delivered  to the Bank on August  5, 1997 for  investment
pursuant  to  the  terms  of  this  Investment  Agreement.  The  Company  hereby
acknowledges that the Invested Funds and any interest accrued thereon under this
Investment   Agreement  are  not  insured  by  the  Federal  Deposit   Insurance
Corporation.

     Section 2. Investments with the Bank.  Investments  hereunder shall be made
by wire transfer in immediately  available funds to Sumitomo Bank of California,
San Francisco,  California,  ABA #121002042 for the account of the Bank, account
number 051-014969-86, reference: AASI.

     Section 3. Term of Agreement. This Investment Agreement will terminate with
respect to the Invested Funds on the earlier of August 5, 2002 or the Expiration
Date of the  Letter of Credit  (the  "Maturity  Date")  unless  extended  at the
request of the Company with the approval of the Bank.


<PAGE>



Prior to the  Maturity  Date,  the Bank shall have  absolute  and  unconditional
custody  and  control  over the  Invested  Funds.  Subject  to the  terms of the
Reimbursement Agreement, the Invested Funds shall be due and payable by the Bank
to the Company in immediately  available  funds to the account  specified by the
Company to the Bank on the  Maturity  Date.  Provided  no Event of  Default  has
occurred and is continuing  under the  Reimbursement  Agreement,  Invested Funds
shall be due and  payable by the Bank to the  Company in  immediately  available
funds to the account  specified  by the  Company to the Bank  within  three days
following  (i) an  optional  redemption  of Bonds  pursuant to Article IV of the
Indenture in the amount of the Bonds so redeemed or (ii) receipt of a request by
the Company,  which request shall include an  acknowledgment by the Company that
the Bank shall not  approve  any  Requisition  pursuant  to Section  3.03 of the
Indenture  at any time that the  aggregate  amount held by the Bank  pursuant to
this Investment  Agreement is less than the aggregate  principal amount of Bonds
Outstanding  and that an amount of Bond proceeds at least equal to the amount of
Invested Funds paid to the Company has been invested with the Bank.

     Section 4. Interest. Interest shall accrue on the daily outstanding balance
of the Invested  Funds from and  including  August 5, 1997 to and  including the
Maturity Date at LIBOR (as hereinafter defined) less 0.15% per annum (calculated
on the basis of a 360-day  year for  actual  number  of days  elapsed).  As used
herein,  "LIBOR" means with respect to any Reset Date (as  hereinafter  defined)
the arithmetic  mean of the rates at which deposits in U.S.  Dollars are offered
by four major banks in the London  interbank  market  selected  by the Bank,  at
approximately  11:00 a.m.,  London time,  on the day that is two  Business  Days
preceding  the Reset Date to prime  banks in the London  interbank  market for a
period of one (1) month  commencing  on the Reset Date.  "Reset  Date" means the
first business day of each calendar week.

     Provided  no Event of Default  has  occurred  and is  continuing  under the
Reimbursement Agreement,  interest shall be credited to the account specified by
the Company on the first Business Day of each month,  on the Maturity Date or on
any earlier  date on which  Invested  Funds are paid to the  Company  hereunder.
Interest  in an  amount  equal to  one-quarter  of the total  interest  accruing
hereunder  through  August  5,  1999  shall be added to and  become  part of the
Invested  Funds on such date. The balance shall be paid to or for the account of
the  Company on such date to the account  specified  in or pursuant to Section 3
hereof or as otherwise directed by the Company.

     Section 5.  Representations and Warranties.  (a) The Company represents and
warrants to the Bank that: (i) this Investment Agreement constitutes a valid and
binding  obligation  of the  Company;  and  (ii)  the  execution,  delivery  and
performance  of this  Investment  Agreement  by the Company will not result in a
breach or  violation  of or cause a  default  under  any  provision  of any law,
regulation,  order, license, decree, judgment,  indenture, contract or agreement
binding upon the Company.

     (b) The  Bank  represents  and  warrants  to the  Company  that:  (i)  this
Investment Agreement constitutes a valid and binding obligation of the Bank; and
(ii) the execution, delivery and performance of this Investment Agreement by the
Bank will not result in a breach or violation of or

                                       B-2

<PAGE>



cause a default  under any  provision of any law,  regulation,  order,  license,
decree, judgment, indenture, contract or agreement binding upon the Bank.

     Section 6. Role of the Bank. It is expressly  understood and agreed that in
performing  its  obligations  hereunder,  the Bank is not acting as a fiduciary,
agent or other  representative  for the registered owners of the Bonds or anyone
else, and that neither the Bank nor any of its directors,  officers,  employees,
or agents shall be liable or responsible  for: (i) the payment to the registered
owners of any amounts owing on or with respect to the Bonds; or (ii) any acts or
omissions of the Issuer or the Trustee  under or with respect to the validity or
enforceability of the Bonds or the Indenture.

     Section 7. No  Implied  Rights.  Nothing  expressed  or  implied  herein is
intended or shall be  construed to confer upon any person,  firm or  corporation
other  than the  parties  hereto  any  right,  remedy or claim by reason of this
Investment Agreement or any term hereof, and all terms contained herein shall be
for the sole and exclusive benefit of the parties hereto and their successors.

     Section 8. Notices. All notices given pursuant to this Investment Agreement
shall be given  telephonically,  with  verification  sent by  first-class  mail,
postage prepaid, or by telex or telecopier, or overnight commercial courier sent
that Business Day to the addresses  fisted below,  or to such other addresses or
to the  attention of such other person as such party shall have  designated  for
such purpose in a written notice to the other:

         To the Company as follows:

                  Advanced Aerodynamics and Structures, Inc.
                  3501 Lakewood Boulevard
                  Long Beach, California 90808
                  Attention:  Carl L. Chen, Ph.D.
                  Telecopy:  (562) 938-8620
                  Telephone:  (562) 938-8618

         To Sumitomo as follows:

                  The Sumitomo Bank, Limited
                  Los Angeles Branch
                  777 South Figueroa Street, Suite 2600
                  Los Angeles, California 90017
                  Attention:  Manager - Structured Finance
                              and Financial Institutions Group
                  Telecopy:  (213) 623-6832
                  Telephone:  (213) 955-0800


                                       B-3

<PAGE>



         To the Trustee as follows:

                  First Trust of California, National Association
                  One California Street, Fourth Floor
                  San Francisco, California  94111
                  Attention:  Corporate Trust Department
                  Telecopy:  (415) 273-4590
                  Telephone:  (415) 273-4576

However, the failure by either party to provide written confirmation on the same
Business  Day of any  telephonic  notice  given  hereunder  will not result in a
breach of this Investment Agreement.

     Section 9.  Successors  and  Assigns.  This  Investment  Agreement  and all
obligations and rights arising  hereunder shall be binding upon and inure to the
benefit of the parties hereto and their respective  successors,  transferees and
assigns.  This Investment Agreement may not be assigned by any party without the
prior written consent of the other party.

     Section 10.  Amendments and Waivers.  This Investment  Agreement may not be
modified,  amended  or  supplemented,  and no term or  provision  hereof  may be
waived, except in writing signed by the parties hereto.

     Section 11.  Governing  Law.  The  obligations  of the Company and the Bank
under this Investment Agreement shall be governed by and construed in accordance
with the laws of the State of California.

     Section 12.  Counterparts.  This  Investment  Agreement  may be executed in
counterparts,  each of which shall be deemed to be an original  and all of which
taken together shall constitute one and the same instrument.



                                       B-4

<PAGE>



     IN  WITNESS  WHEREOF,  the  parties  hereto  have  caused  this  Investment
Agreement to be executed as of the date written above.

                                      THE SUMITOMO BANK, LIMITED



                                       By:
                                          _______________, Los Angeles Branch


                                       ADVANCED AERODYNAMICS AND
                                       STRUCTURES, INC.



                                        By:
                                            President
ATTEST:


By:
         Secretary

(SEAL)




                                       B-5

<PAGE>



                                    EXHIBIT C

                             DIRECT OBLIGATION NOTE


     FOR VALUE RECEIVED, the undersigned,  ADVANCED AERODYNAMICS AND STRUCTURES,
INC.  (the  "Company"),  hereby  promises to pay to THE SUMITOMO  BANK,  LIMITED
("Sumitomo"),  a banking  corporation  organized under the laws of Japan, acting
through its Los Angeles  Branch,  on or before August 5, 2002, the lesser of (i)
the  principal  sum of Eight  Million Six  Hundred  Twenty-Five  Thousand  Seven
Hundred Fifty-Four Dollars ($8,625,754), together with all other amounts due and
owing under the  Reimbursement  Agreement dated as of August 1, 1997 (as amended
from time to time,  the  "Reimbursement  Agreement")  between  the  Company  and
Sumitomo,  or (ii) the  aggregate  outstanding  amount of all loans  made to the
Company by Sumitomo pursuant to the Reimbursement  Agreement,  together with all
other amounts due and owing under the  Reimbursement  Agreement,  in immediately
available  funds at the principal  corporate  office of  Sumitomo's  Los Angeles
Branch in Los Angeles,  California (or such other office of Sumitomo  located in
the United States of America as Sumitomo may designate to the Company in writing
from time to time), on the dates and at the times specified in the Reimbursement
Agreement and to pay interest on the outstanding  balance of such amounts at the
times  specified in the  Reimbursement  Agreement at a rate per annum (except as
otherwise  specified  in the  Reimbursement  Agreement)  equal to (x) LIBOR less
0.15% per annum and (y) with  respect to any  amounts  not paid when due, a rate
per annum equal to the sum of the  corporate  base rate  publicly  announced  by
Morgan  Guaranty  Trust  Company  of New  York in New  York,  New  York  (or its
successor),  from time to time as its prevailing corporate base rate, which rate
shall  change when and as said  corporate  base rate  changes,  plus two percent
(2.0%).  Sumitomo is  authorized  to record all loans and all  payments  made on
account of the principal due on the loans on the Loan Schedule  attached hereto.
Such Loan Schedule,  and any continuations  thereof,  are hereby incorporated by
reference  herein and made a part hereof,  and Sumitomo's  endorsements  thereon
shall be conclusive absent manifest error. The failure to make any such notation
shall not,  however,  affect the Company's  obligations under this Note. As used
herein,  "LIBOR" means with respect to any Reset Date (as  hereinafter  defined)
the arithmetic  mean of the rates at which deposits in U.S.  Dollars are offered
by four major banks in the London  interbank  market  selected  by the Bank,  at
approximately  11:00 a.m.,  London time,  on the day that is two  Business  Days
preceding  the Reset Date to prime  banks in the London  interbank  market for a
period  of one (1)  week  commencing  on the  Reset  Date.  "Reset  Date"  means
Wednesday of each week (or, if such  Wednesday  is not a Business  Day, the next
Business Day).

     This obligation is issued under, and is subject to all of the terms of, the
Reimbursement  Agreement.  Terms defined in the Reimbursement  Agreement and not
otherwise defined herein shall have the same meanings herein as therein.

     Notwithstanding  the due date of this Note each and  every  amount  payable
shall be  accelerated  to the  extent  that:  (x) funds are  available  from the
Trustee from sources available under the Indenture, (y) funds are available from
the Remarketing  Agent from the remarketing  proceeds of the Bonds, or (z) funds
are available from any Alternate Letter of Credit (as defined in the Indenture).



<PAGE>



     The Company hereby waives presentment for payment,  demand, protest, notice
of protest,  notice of dishonor  and all  defenses on the ground of extension of
time of  payment  for the  payment  hereof  which  may be given  (other  than in
writing) by Sumitomo to the Company.

     This Note shall be governed by and construed in accordance with the laws of
the State of California.

     IN WITNESS WHEREOF, the Company has caused this Note to be duly executed.

         Dated:   August 5, 1997

                                        ADVANCED AERODYNAMICS AND
                                        STRUCTURES, INC.



                                        By:
                                            President
ATTEST:


By:
        Secretary



                                       C-2

<PAGE>



                                  LOAN SCHEDULE



               Principal       Principal                         Notation
Date            Amount            Paid           Balance          Made By























                                       C-3

<PAGE>



                                    EXHIBIT D

                     CUSTODY, PLEDGE AND SECURITY AGREEMENT


     CUSTODY,  PLEDGE  AND  SECURITY  AGREEMENT  dated as of  August  1, 1997 is
entered  into  among  ADVANCED  AERODYNAMICS  AND  STRUCTURES,  INC.,  a limited
partnership  organized under the laws of the State of Delaware (the  "Company"),
THE SUMITOMO BANK,  LIMITED, a banking  corporation  organized under the laws of
Japan,  acting through its Los Angeles Branch  ("Sumitomo"),  and FIRST TRUST OF
CALIFORNIA,  NATIONAL ASSOCIATION,  as custodian (the "Custodian"),  pursuant to
the  Reimbursement  Agreement dated as of August 1, 1997 between the Company and
Sumitomo  (hereinafter,  as the  same  may  from  time  to time  be  amended  or
supplemented, called the "Reimbursement Agreement"):

                                    RECITALS

     1. On  August  5,  1997,  the  California  Economic  Development  Financing
Authority (the "Issuer") issued its Variable Rate Demand Industrial  Development
Revenue Bonds, Series l 997 (Advanced Aerodynamics and Structures, Inc. Project)
(the  "Bonds")  pursuant to an Indenture of Trust dated as of August 1, 1997 (as
amended or supplemented  from time to time, the "Indenture")  between the Issuer
and First Trust of California,  National Association,  as trustee (together with
any successor trustee under the Indenture, the "Trustee").

     2. The  Indenture  requires  that the Bonds be  purchased  from the  owners
thereof on the dates on which the Bonds are  subject to  optional  or  mandatory
tender  pursuant to Sections  4.06 and 4.07 of the  Indenture  (any such date is
referred to herein as the "Tender  Date") under the  circumstances  set forth in
the Indenture.

     3. The Company  has agreed to enter into the  Reimbursement  Agreement  and
thereby cause Sumitomo to issue its transferable  irrevocable  direct pay letter
of credit (the "Letter of Credit")  which may be drawn upon,  inter alia, to pay
the purchase price of Bonds which are subject to optional or mandatory tender on
such Tender Dates.

     4. Bonds tendered or deemed to have been tendered pursuant to the Indenture
which are  purchased by a draw on the Letter of Credit will be registered in the
name of  Sumitomo  or its  nominee  pursuant  to this  Pledge  Agreement  unless
Sumitomo directs otherwise.

     5. It is a  condition  precedent  to  Sumitomo's  delivery of the Letter of
Credit that the Company enter into this Custody,  Pledge and Security  Agreement
(as amended or  supplemented  from time to time, this "Pledge  Agreement")  with
Sumitomo and the Custodian.

     6. First Trust of California,  National  Association  has been appointed as
the Trustee under the Indenture and has also agreed to act as a custodian  under
this Pledge Agreement.


                                       D-1

<PAGE>



     NOW,  THEREFORE,  in  consideration  of the premises and in order to induce
SUMITOMO  to enter  into the  Reimbursement  Agreement  and issue the  Letter of
Credit thereunder and for other good and valuable consideration, the receipt and
sufficiency  of  which is  hereby  acknowledged,  the  parties  hereto  agree as
follows:

     1. Defined Terms.  Unless  otherwise  defined herein,  terms defined in the
Reimbursement  Agreement or the Indenture shall have such defined  meanings when
used herein.

     2. Pledge. The Company hereby pledges, assigns, hypothecates, transfers and
delivers to Sumitomo all its right,  title and interest in and to all Bonds,  as
the  same  may be from  time to time  delivered  to the  Trustee  by the  owners
thereof,  that may be purchased with funds drawn under the Letter of Credit (the
"Pledged  Bonds"),  and hereby  grants to Sumitomo a first lien on, and security
interest in, all rights, title and interest of the Company in and to the Pledged
Bonds, the interest thereon and all proceeds thereof, as collateral security for
the prompt and complete  payment  when due of all amounts due to Sumitomo  under
the Reimbursement  Agreement and the performance of all other obligations of the
Company under the Reimbursement Agreement and the other Credit Documents (all of
the foregoing being hereinafter called the "Obligations").

     3. Custody and Registration of Bonds: Fees of Custodian.

          (a) Sumitomo hereby designates and appoints the Custodian as its agent
and bailee to perfect Sumitomo's pledge, assignment and security interest in the
Pledged Bonds and to serve in accordance  with the terms and  conditions of this
Pledge  Agreement as  custodial  agent of Sumitomo  for the Pledged  Bonds,  the
interest thereon and all proceeds thereof.  Upon any drawing under the Letter of
Credit for the  purchase  price of the Bonds,  the Trustee  shall  deliver  such
Pledged  Bonds  to  the  Custodian,   and  the  Custodian  hereby  accepts  such
appointment  and agrees to perform as  custodial  agent for Sumitomo and to hold
Pledged  Bonds on behalf of Sumitomo in accordance  with the  provisions of this
Pledge  Agreement.  Upon receipt of such Bonds,  the Custodian  shall notify the
Remarketing   Agent  and  the  Company  (by   telecopier  or  other   electronic
communication)   that  Bonds  equal  to  the  portion  of  the  purchase   price
attributable to principal are being held by the Custodian for Sumitomo  pursuant
to this Pledge Agreement.

          (b)  Unless  otherwise  directed  by  Sumitomo  (but  subject  to  the
provisions  of Section 11 hereof),  the  Custodian  shall  cause  either (A) any
Pledged Bonds which have not been  remarketed in accordance with the Remarketing
Agreement to be registered by the Trustee in the name of Sumitomo or its nominee
or (B) if DTC is the registered owner of all Bonds, any Pledged Bonds which have
not  been  remarketed  in  accordance  with  the  Remarketing  Agreement  to  be
registered  in the  name of DTC  with  Sumitomo's  or its  nominee's  beneficial
ownership  interest of such  Pledged  Bonds  recorded  by DTC on its books.  The
Company  hereby agrees that it will execute and deliver such  documents and take
such steps as Sumitomo may  reasonably  request in order to perfect and maintain
perfected Sumitomo's security interest in the Collateral.

                                       D-2

<PAGE>



          (c) The Company irrevocably  constitutes and appoints the Custodian as
its  attorney to cause the  transfer of any Pledged  Bonds on the books kept for
the  registration  thereof and authorizes the Custodian to deliver Pledged Bonds
to the Trustee for  reregistration,  if appropriate,  and delivery in accordance
with the terms of this Pledge Agreement.

          (d) The fees of the Custodian,  if any, in connection with this Pledge
Agreement shall be for the account of the Company.

     4. Payments on the Bonds; Voting Rights.

          (a) If, while this Pledge  Agreement is in effect,  the Company  shall
become  entitled to receive or shall  receive any  payment,  including,  without
limitation, any payment of principal,  premium, interest or proceeds of sale, in
respect of the  Pledged  Bonds,  such  payment  shall be subject to this  Pledge
Agreement.  Any such payment  shall be made  directly to  Sumitomo,  and, in the
event any such payment is received by the Company,  the Company agrees to accept
the same as  Sumitomo's  agent,  to hold the same in trust on behalf of Sumitomo
and to deliver  the same  forthwith  to  Sumitomo.  All sums of money so paid in
respect of the  Pledged  Bonds  which are  received  by the  Company and paid to
Sumitomo  and all such amounts  which shall be paid  directly to Sumitomo by the
Trustee  shall be  credited  against  the  Obligations  of the  Company  owed to
Sumitomo.  If the  payments  are in  excess  of the  amounts  owed to  Sumitomo,
Sumitomo shall return the excess to the Company.

          (b) During such time as Bonds are pledged to Sumitomo  under the terms
of this Pledge  Agreement,  Sumitomo  shall be  entitled to exercise  all of the
rights of an owner of Bonds with respect to voting, consenting and directing the
Trustee as if  Sumitomo  were the owner of such Bonds,  and the  Company  hereby
grants and assigns to Sumitomo all such rights.

     5. Collateral. The Pledged Bonds, all income therefrom and proceeds thereof
are herein collectively sometimes called the "Collateral."

     6. Release of the Bonds.

          (a)  Simultaneously  with the receipt by the Custodian of the proceeds
of sale of any  Pledged  Bonds  which  are  remarketed  in  accordance  with the
Indenture and the  Remarketing  Agreement for a purchase  price of not less than
the principal  amount thereof,  Pledged Bonds in a principal amount equal to the
purchase  price shall be released  from the lien of this  Pledge  Agreement  and
delivered at the direction of the Remarketing  Agent.  The Custodian agrees that
the proceeds of such sale will be disbursed in accordance with the provisions of
Section 8.11 of the Indenture.


                                       D-3

<PAGE>



          (b) Upon  receipt by the  Custodian of written  notice from  Sumitomo,
which notice may be sent by telecopy if immediately  confirmed in writing,  that
Sumitomo has received  payment or  prepayment in full of all amounts owing under
the  Reimbursement  Agreement,  all such Pledged Bonds and any other  Collateral
pledged to Sumitomo then subject to the lien of this Pledge  Agreement  shall be
released  herefrom and registered in the name of and delivered to the Company or
its order.

     7. Exculpatory  Provisions.  Neither the Custodian nor any of its officers,
directors,  employees,  agents,  attorneys-in-fact or affiliates shall be liable
for any action  lawfully taken or omitted to be taken by it or such person under
or in connection with this Pledge Agreement (except for its or each person's own
gross  negligence  or willful  misconduct),  including any failure to collect or
realize upon the Obligations or any Collateral, security or guaranty therefor or
any part thereof.  The Company hereby indemnifies the Custodian from and against
any and all claims,  losses,  damages,  liabilities  and  expenses  which may be
imposed on, incurred by or asserted  against the Custodian in any way related to
or arising out of the subject matter of this Pledge  Agreement  (except for such
claims,  losses,  damages,  liabilities  and  expenses  which  arise  out of the
Custodian's gross negligence or willful misconduct). The Custodian undertakes to
perform only such duties as are expressly  set forth  herein.  The Custodian may
rely and shall be protected in acting or refraining from acting upon any written
notice,  instruction or request  furnished to it hereunder and believed by it to
be  genuine  and  to  have  been  signed  or  presented  by an  Authorized  Bank
Representative; "Authorized Bank Representative" means any one of the persons at
the  time  designated  to act on  behalf  of  Sumitomo  by  written  certificate
furnished to the Custodian, which certificate shall be substantially in the form
set forth in Attachment A attached  hereto and by reference  made a part hereof,
and may be changed from time to time by Sumitomo furnishing a new certificate to
the  Custodian.  The  Custodian  may consult  with counsel of its own choice and
shall have full and complete  authorization  and protection for any action taken
or suffered by it hereunder in good faith and in accordance  with the opinion of
such counsel.  Notwithstanding  any provision to the contrary  contained herein,
the Custodian  shall not be responsible for any act or failure to act absent its
gross negligence or willful misconduct.

     8.  Resignation  or Removal of  Custodian.  The Custodian may resign and be
discharged from its duties and  obligations  hereunder by giving at least thirty
(30) days' prior written notice of such resignation to Sumitomo,  specifying the
date on which such resignation is to take effect.  Sumitomo, with the consent of
the Company  (which consent shall not be  unreasonably  withheld and which shall
not be  required  if an Event of Default  (as  defined in Section 9 hereof)  has
occurred and is  continuing),  may remove and discharge  the Custodian  from its
duties and  obligations  hereunder  by giving at least five (5)  Business  Days'
prior  written  notice of such removal to the Custodian  specifying  the date on
which such removal is to take effect.

     9. Event of  Default.  The term  "Event of  Default" as used in this Pledge
Agreement  shall  mean (a) an Event  of  Default  under  and as  defined  in the
Reimbursement  Agreement  or (b)(i) the failure by any of the parties  hereto to
comply with the  provisions  of Sections 3 or 6 hereof,  (ii) the failure by the
Company to perform or observe any covenant contained in Section 12 or 13 hereof,
or

                                       D-4

<PAGE>



(iii) any  representation or warranty made by the Company pursuant to Section 12
hereof proving to have been incorrect in any material respect when made.

     10. Rights of Sumitomo. Sumitomo shall not be liable for failure to collect
or realize  upon the  Obligations  or any  Collateral  or any  security or other
guarantee therefor, or any part thereof, or for any delay in so doing, nor shall
either party be under any obligation to take any action  whatsoever  with regard
thereto.  If an Event of Default or event  which with notice or lapse of time or
both would become an Event of Default has occurred and is  continuing,  Sumitomo
may  thereafter,  without  notice,  exercise all rights,  privileges  or options
pertaining  to any Pledged  Bonds  pledged to  Sumitomo as if Sumitomo  were the
holder and absolute  owner  thereof,  upon such terms and conditions as Sumitomo
may determine,  all without  liability except to account for Collateral or other
property  actually  received  by it,  but  Sumitomo  shall  not have any duty to
exercise any of the  aforesaid  rights,  privileges  or options and shall not be
responsible for any failure to do so or delay in so doing.

     11. Remedies. In the event any portion of the Obligations has been declared
due and payable,  Sumitomo may, with the prior written  approval of the Company,
forthwith collect, receive,  appropriate and realize upon the Collateral pledged
to it, or any part thereof,  and/or may forthwith sell,  assign,  give option or
options to purchase,  contract to sell or otherwise  dispose of and deliver said
Collateral pledged to it, or any part thereof,  in one or more parcels at public
or  private  sale  or  sales,  at  any  exchange,  broker's  board  or at any of
Sumitomo's  branches,  agencies or  offices,  or  elsewhere  upon such terms and
conditions as Sumitomo and the Company may deem  advisable and at such prices as
Sumitomo  and the  Company  may deem  best,  for cash or on credit or for future
delivery without  assumption of any credit risk, with the right to Sumitomo upon
any such sale or sales,  public or private, to purchase the whole or any part of
said  Collateral  pledged  to it and so sold,  free of any  right or  equity  of
redemption  in the Company which right or equity is hereby  expressly  waived or
released.  Sumitomo  shall  pay over the net  proceeds  of any such  collection,
recovery,  receipt,  appropriation,  realization  or sale  after  deducting  all
reasonable  costs and expenses of every kind  incurred  therein or incidental to
the care,  safekeeping or otherwise of any and all of the Collateral  pledged to
it or in any  way  relating  to the  rights  of  Sumitomo  hereunder,  including
reasonable  attorneys' fees and legal expenses,  to the payment,  in whole or in
part, of the Obligations in such order as Sumitomo may elect.

     12.  Representations,  Warranties and Covenants of the Company. The Company
represents, warrants and covenants that:

          (a) on the date of delivery to  Sumitomo or to the  Custodian  for the
account of Sumitomo of any Pledged  Bonds  described  herein,  the Company shall
have taken no action which would  create any right,  title or interest in and to
the Pledged Bonds in favor of the Remarketing Agent or the Trustee;

          (b)  it  has,  and on the  date  of  delivery  to  Sumitomo  or to the
Custodian  for the  account of Sumitomo  of any  Pledged  Bonds will have,  full
power, authority and legal right

                                       D-5

<PAGE>



to pledge all of its  right,  title and  interest  in and to the  Pledged  Bonds
pursuant to this Pledge Agreement;

          (c) this  Pledge  Agreement  has been duly  authorized,  executed  and
delivered by the Company and constitutes a legal,  valid and binding  obligation
of  the  Company   enforceable   in  accordance   with  its  terms,   except  as
enforceability   may  be   limited   by   applicable   bankruptcy,   insolvency,
reorganization,  moratorium or similar laws affecting  creditors' rights and, to
the extent that such instruments require or may require,  enforcement by a court
of  equity,  such  principles  of equity as the court  having  jurisdiction  may
impose;

          (d) no consent of any other party (including,  without limitation, the
creditors  of  the  Company)  and  no  consent,  license,  permit,  approval  or
authorization of, exemption by, notice or report to, or registration,  filing or
declaration with, any governmental  authority,  domestic or foreign, is required
to be obtained  by the Company in  connection  with the  execution,  delivery or
performance of this Pledge Agreement;

          (e) the execution,  delivery and performance of this Pledge  Agreement
will not result in a material  violation of any provision of any  applicable law
or regulation or of any order, judgment,  writ, award or decree directly binding
on the Company of any court, arbitrator or governmental  authority,  domestic or
foreign,  or of the  Company's  organizational  documents,  or of any  mortgage,
indenture,  lease,  contract,  or other agreement,  instrument or undertaking to
which the Company is a party or which,  to the best  knowledge  of the  Company,
purports to be binding upon the Company or upon any of its respective assets and
will not result in the creation or imposition of any lien, charge or encumbrance
on or  security  interest  in  any of  the  assets  of  the  Company  except  as
contemplated by this Pledge Agreement; and

          (f) the pledge,  assignment and delivery of the Pledged Bonds pursuant
to this Pledge Agreement will create a valid first lien on and a first perfected
security interest in Sumitomo in all right,  title or interest of the Company in
or to such  Bonds,  and the income  and  proceeds  thereof,  subject to no prior
pledge,  lien, mortgage,  hypothecation,  security interest,  charge,  option or
encumbrance  or to any  agreement  purporting  to  grant  to any  third  party a
security  interest in the property or assets of the Company  which would include
the  Pledged  Bonds.  The  Company  covenants  and  agrees  that it will  defend
Sumitomo's  right,  title and security  interest in and to the Pledged Bonds and
the income and  proceeds  thereof  against the claims and demands of all persons
whomsoever.

     13. No Disposition,  Etc. The Company agrees that it will not,  without the
prior written consent of Sumitomo, sell, assign, transfer, exchange or otherwise
dispose  of, or grant any option  with  respect  to, the  Collateral  (except as
provided in Section 6 of this Pledge  Agreement),  nor will it create,  incur or
permit to exist any pledge,  lien, mortgage,  hypothecation,  security interest,
charge,  option or any other  encumbrance with respect to any of the Collateral,
or any  interest  therein,  or any  proceeds  thereof,  except  for the lien and
security interest provided for by this Pledge Agreement.

                                       D-6

<PAGE>



     14. Further  Assurances.  The Company agrees that at any time and from time
to tine,  upon the written  request of  Sumitomo,  the Company  will execute and
deliver such further  documents  and do such further acts and perform all things
as  Sumitomo  may  reasonably  request in order to effect the  purposes  of this
Pledge Agreement.

     15.  Severability.   Any  provision  of  this  Pledge  Agreement  which  is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining  provisions  hereof,  and any such  prohibition  or
unenforceability m any jurisdiction shall not invalidate or render unenforceable
such provision in any other jurisdiction.

     16. No Waiver;  Cumulative Remedies.  Sumitomo shall not by any act, delay,
omission  or  otherwise  be deemed to have  waived any of its rights or remedies
hereunder,  and no waiver shall be valid unless in writing,  signed by Sumitomo,
and then only to the extent therein set forth. A waiver by Sumitomo of any right
or remedy  hereunder on any one occasion  shall not be construed as a bar to any
right or remedy which Sumitomo would otherwise have on any further occasion.  No
failure to exercise nor any delay in exercising by Sumitomo of any right,  power
or privilege  hereunder shall operate as a waiver thereof;  nor shall any single
or partial  exercise of any right,  power or  privilege  hereunder  preclude any
other or further exercise  thereof or the exercise of any other right,  power or
privilege.  The rights and remedies  herein  provided are  cumulative and may be
exercised singly or concurrently and are not exclusive of any rights or remedies
provided by law.

     17. Waivers, Amendments: Applicable Law. None of the terms or provisions of
this Pledge Agreement may be waived,  altered,  modified or amended except by an
instrument in writing, duly executed by Sumitomo, the Company and the Custodian.
This Pledge  Agreement and all  obligations  of the Company  hereunder  shall be
binding upon the successors and assigns of the Company and shall,  together with
the rights and  remedies of  Sumitomo,  inure to the benefit of Sumitomo and its
respective  successors  and assigns.  THE  OBLIGATIONS OF THE PARTIES UNDER THIS
PLEDGE  AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF CALIFORNIA.

     18. Term.  This Pledge  Agreement shall remain in full force and effect for
so long as the Letter of Credit is in effect or any  amount is owed to  Sumitomo
under this Pledge  Agreement,  the  Reimbursement  Agreement or any other Credit
Documents,  provided  that in the event of the  resignation  or  removal  of the
Trustee under the Indenture, the Custodian shall resign or be removed under this
Pledge Agreement,  and the successor Trustee appointed under the Indenture shall
be appointed as the successor custodian under this Pledge Agreement.

     19. Notices.  Unless otherwise  provided for in this Pledge Agreement,  any
notice  required or  permitted  to be given under this Pledge  Agreement  may be
given by certified or registered mail, return receipt requested, or by telecopy,
charges  prepaid,  or  by  commercial   overnight  delivery  service,   prepaid,
addressed:


                                       D-7

<PAGE>



         If to the Company:

                  Advanced Aerodynamics and Structures, Inc.
                  3501 Lakewood Boulevard
                  Long Beach, California  90808
                  Attention:  Carl L. Chen, Ph.D.
                  Telecopy:  (562) 938-8620
                  Telephone:  (562) 938-8618

         If to the Custodian:

                  First Trust of California, National Association
                  One California Street, Fourth Floor
                  San Francisco, California  94111
                  Attention:  Corporate Trust Department
                  Telecopy:  (415) 273-4590
                  Telephone:  (415) 273-4576

         If to Sumitomo:

                  The Sumitomo Bank, Limited
                  Los Angeles Branch
                  777 South Figueroa Street, Suite 2600
                  Los Angeles, California 90017
                  Attention:  Manager - Structured Finance
                              and Financial Institutions Group
                  Telecopy:  (213) 623-6832
                  Telephone:   (213) 955-0800

Any  notice  sent by mail  shall be  deemed  given  three  (3) days  after it is
deposited in the mails.  Any notice sent by telecopy  shall be deemed given when
sent. Any notice sent by commercial  overnight  delivery service shall be deemed
given one (1) Business Day after it is deposited for  delivery.  Notwithstanding
anything  herein to the contrary,  notices to release Bonds from Sumitomo to the
Custodian  may be made by  telecopy  and each  such  notice  shall  be  promptly
confirmed in writing as specified above.

     20.  Execution in  Counterparts.  This Pledge  Agreement may be executed in
multiple counterparts, each of which shall be an original and all of which shall
constitute but one and the same instrument.


                                       D-8

<PAGE>



     IN WITNESS WHEREOF, the parties hereto have caused this Pledge Agreement to
be duly executed and delivered by their duly  authorized  officers as of the day
and year first above written.

                                        ADVANCED AERODYNAMICS AND
                                        STRUCTURES, INC.


                                         By:
                                               President
ATTEST:


By:
       Secretary

(SEAL)
                                         THE SUMITOMO BANK, LIMITED



                                         By:
                                            _____________,. Los Angeles Branch


                                         FIRST TRUST OF CALIFORNIA,
                                         NATIONAL ASSOCIATION, as Custodian



                                         By:
                                         Its:


                                       D-9

<PAGE>



                                  ATTACHMENT A
                                       TO
                                PLEDGE AGREEMENT

             CERTIFICATE DESIGNATING AUTHORIZED BANK REPRESENTATIVES

     The  Sumitomo  Bank,  Limited,   acting  through  its  Los  Angeles  Branch
("Sumitomo"),   hereby   certifies  to  FIRST  TRUST  OF  CALIFORNIA,   NATIONAL
ASSOCIATION  (the  "Custodian"),  as custodian  agent for Sumitomo in accordance
with that certain Custody, Pledge and Security Agreement,  dated as of August 1,
1997  among  Advanced  Aerodynamics  and  Structures,  Inc.,  Sumitomo  and  the
Custodian, that the "Authorized Bank Representatives" for Sumitomo from the date
of this Certificate until the Custodian's receipt of a Certificate  furnished in
replacement hereof shall be the following individuals so designated below:

Name                                        Specimen Signature


     IN WITNESS  WHEREOF,  Sumitomo has executed this Certificate as of this lst
day of August, 1997.

                                         THE SUMITOMO BANK, LIMITED

                                          By:
                                          Title:


                                      D-10

<PAGE>



                                    EXHIBIT E


             [Letterhead of Luce, Forward, Hamilton and Scripps LLP]



                                 August 5, 1997



The Sumitomo Bank, Limited
777 South Figueroa Street, Suite 2600
Los Angeles, California 90017

California Economic Development
Financing Authority
801 K Street, Suite 1700
Sacramento, California 95814

         Re:      $8,500,000 California Economic Development
                  Financing Authority Variable Rate Demand Industrial
                  Development Revenue Bonds, Series 1997
                  (Advanced Aerodynamics and Structures, Inc. Project)

Ladies and Gentlemen:

     We have acted as counsel to Advanced  Aerodynamics and Structures,  Inc., a
corporation  organized and existing under the laws of the State of Delaware (the
"Borrower"),  in  connection  with  the  issuance  by  the  California  Economic
Development  Financing  Authority (the "Issuer") of its $8,500,000 Variable Rate
Demand Industrial  Development Revenue Bonds, Series 1997 (Advanced Aerodynamics
and Structures, Inc.) (the "Bonds").

     We have  examined  the  original,  certified  copies,  or copies  otherwise
identified to our satisfaction as being true copies of the following:

     1 . The Certificate of Incorporation  and By-Laws of Advanced  Aerodynamics
and Structures, Inc.;

     2. The Official Statement, dated August 4, 1997, relating to and describing
the Bonds;

     3. The  Indenture of Trust,  dated as of August 1, 1997 (the  "Indenture"),
between  the Issuer and First Trust of  California,  National  Association  (the
"Trustee");


                                       E-1

<PAGE>



     4. The Loan Agreement,  dated as of August 1, 1997 (the "Loan  Agreement"),
between the Issuer and the Borrower  relating to the Project  described  therein
(the "Project");

     5.  The  Reimbursement   Agreement,   dated  as  of  August  1,  1997  (the
"Reimbursement Agreement"),  between The Sumitomo Bank, Limited (the "Bank") and
the Borrower;

     6. The Direct Obligation Note, dated August 5, 1997 (the "Note"),  from the
Borrower to the Bank;

     7. The Custody,  Pledge and Security Agreement,  dated as of August 1, 1997
(the  "Pledge  Agreement"),  among the  Borrower,  the Bank and  First  Trust of
California, National Association, as custodian; and

     8.  The  Investment   Agreement  dated  August  5,  1997  (the  "Investment
Agreement"), between the Borrower and the Bank

and such other documents,  certificates,  and records as we have deemed relevant
and necessary as the basis for the opinions set forth herein (collectively,  the
"Documents").  The items referred to in numbers 4, 5, 6, 7 and 8 are referred to
as the "Borrower  Documents".  Relying on such examination and pertinent law and
subject to the limitations and  qualifications  hereinafter set forth, we are of
the opinion that:

     1. The Borrower is a corporation duly organized under the laws of the State
of  Delaware,  is duly  authorized  to  conduct  its  business  in the  State of
California,  has  power to enter  into the  Borrower  Documents,  and to use the
Project for the purpose set forth in the Loan Agreement and has duly  authorized
the  execution  and  delivery of the  Borrower  Documents  and has  reviewed and
approved the Indenture.

     2. The execution and delivery of the Borrower  Documents,  the consummation
of the transactions  contemplated  thereby and by the other Borrower  documents,
and the  fulfillment of the terms and  conditions  thereof do not, and will not,
conflict  with,  or result in a breach of, any of the terms or conditions of the
Borrower's  Certificate  of  Incorporation  or By-Laws,  any  restriction or any
agreement or  instrument  to which the Borrower is now a party or by which it is
bound or to which any property of the  Borrower is subject,  and do not and will
not constitute a default under any of the  foregoing,  or be in violation of any
order, decree,  statute, rule or regulation of any court or any state or federal
regulatory  body  having  jurisdiction  over  the  Borrower  or its  properties,
including  the  Project,  and do not,  and will not,  result in the  creation or
imposition of any lien,  charge,  or  encumbrance  of any nature upon any of the
property or assets of the Borrower  contrary to the terms of any  instrument  or
agreement to which the Borrower is a party or by which it is bound.


                                       E-2

<PAGE>


     3. The Borrower Documents have been duly authorized, executed and delivered
and are valid and legally  binding  obligations  of the Borrower  enforceable in
accordance with their terms.

     4. There are no actions,  suits or proceedings pending, or to the knowledge
of the Borrower, threatened against the Borrower or any property of the Borrower
in any court or before any  federal,  state,  municipal,  or other  governmental
agency,  which,  if decided  adversely  to the  Borrower,  would have a material
adverse  effect upon the  Borrower or upon the  business  or  properties  of the
Borrower,  and the  Borrower is not in default  with respect to any order of any
court or governmental agency.

     5 . There are presently no actions,  proceedings,  or litigation before any
court or governmental agency nor to the best of our knowledge,  after reasonable
investigation,  are any threatened or pending against or affecting the Borrower,
in which an unfavorable decision,  ruling, or finding would adversely affect the
validity or  enforceability  of the  Borrower  Documents,  or the  exclusion  of
interest on the Bonds from federal income taxation.

     6. We are unaware of any fact which materially  adversely  affects,  or may
materially  adversely  affect,  the  ability  of the  Borrower  to pay the  Bank
Reimbursement Obligations, as defined in the Reimbursement Agreement.

     7. No  further  approval,  authorization,  consent,  or other  order of any
public board or body (other than the  authorization of the Issuer and compliance
with any applicable  securities  laws) is legally  required for the transactions
contemplated by the Borrower Documents.

     8. The  financing  evidenced  and secured by the Borrower  Documents is not
usurious.

     9. Pursuant to the Reimbursement Agreement, the Borrower has granted to the
Bank a first lien perfected security interest in the Investment Agreement.

     Our opinion is subject to principles of equity  affecting  enforcement  and
remedies,  bankruptcy,  insolvency,   reorganization,   moratorium  and  similar
statutes  affecting  the  rights  of  creditors  and  secured  parties,  and the
availability of the remedy of specific performance or injunctive relief or other
equitable  relief  subject  to the  discretion  of the  court  before  which any
proceeding may be brought.

                                           Very truly yours,



                                       E-3



                                PURCHASE CONTRACT

                                   $8,500,000
               California Economic Development Financing Authority
                              Variable Rate Demand
                Industrial Development Revenue Bonds, Series 1997
              (Advanced Aerodynamics and Structures, Inc. Project)

                                 August 4, 1997

California Economic Development Financing Authority
801 K Street, Suite 1700
Sacramento, California 91584

The Honorable Matt Fong
Treasurer of the State of California
915 Capitol Mall, Room 110
Sacramento, California 95814

Ladies and Gentlemen:

         1. Rauscher Pierce Refsnes,  Inc. (the  "Underwriter")  offers to enter
into this purchase  contract  (this  "Purchase  Contract")  with the  California
Economic Development  Financing Authority (the "Authority") and the Treasurer of
the  State  of  California,  solely  in his  capacity  as  agent of sale for the
Authority (the  "Treasurer"),  which upon the  Authority's  and the  Treasurer's
acceptance  hereof will be binding upon the  Authority,  the  Treasurer  and the
Underwriter.  This offer is made  subject  to the  Authority's  and  Treasurer's
acceptance  by  execution  of this  Purchase  Contract  and approval by Advanced
Aerodynamics and Structures,  Inc., a Delaware  corporation (the "Borrower") and
their delivery of same to the Underwriter at or before 9:00 p.m., New York time,
today.  Delivered to you herewith as Exhibit A, is the Letter of Representation,
dated the date hereof (the "Letter of Representation"), under which the Borrower
makes certain representations and undertakes certain obligations with respect to
this Purchase Contract.

         2.  Upon  the  terms  and   conditions   and  upon  the  basis  of  the
representations, warranties and covenants hereinafter set forth, the Underwriter
hereby  agrees to purchase  from the Authority and the Treasurer for offering to
the public,  and the  Authority  and the  Treasurer  hereby agree to sell to the
Underwriter for such purpose, at an interest rate to be determined in accordance
with the terms of the Indenture  (hereinafter  defined),  all (but not less than
all) of $8,500,000  aggregate principal amount of the Authority's  Variable Rate
Demand Industrial  Development Revenue Bonds, Series 1997 (Advanced Aerodynamics
and Structures,  Inc.  Project),  dated as of the date of delivery  thereof (the
"Bonds").  The purchase price of the Bonds shall be 100% of the principal amount
of the Bonds.

         3. The Bonds shall be otherwise  as  described  in, and shall be issued
and secured under the provisions of, the Indenture of Trust,  dated as of August
1, 1997 (the "Indenture"), by and



<PAGE>



between the Authority and First Trust of California,  National  Association,  as
trustee (the "Trustee"). The proceeds of sale of the Bonds will be loaned to the
Borrower  pursuant to the Loan  Agreement (as  hereinafter  defined) and will be
applied  by the  Borrower  to defray  the  Borrower's  cost of the  acquisition,
construction,   improving  and  equipping  of  a  manufacturing   facility  (the
"Project").  The Project is further described in the Loan Agreement, dated as of
August 1, 1997 (the "Loan  Agreement"),  between the Authority and the Borrower.
The Bonds  will be secured by an  irrevocable  direct pay letter of credit  (the
"Letter of Credit") issued by The Sumitomo Bank, Limited, acting through its Los
Angeles Branch, (the "Bank"), pursuant to the Reimbursement Agreement,  dated as
of  August 1, 1997 (the  "Reimbursement  Agreement"),  between  the Bank and the
Borrower.

         The Bonds are more fully described in the Official  Statement  relating
to the Bonds, dated August 4, 1997 (the "Official Statement").

         4. The  Underwriter  agrees to make a bona fide public  offering of all
the  Bonds  at par,  plus  interest  accrued  thereon,  if any,  to the  date of
delivery.  The Bonds may be offered and sold to certain  dealers  (including the
Underwriter and other dealers depositing such Bonds into investment trusts) at a
price or at prices lower than such public offering price.

         5. As soon as practicable after the execution of this Purchase Contract
by the Authority,  but no later than the Closing, the Authority shall deliver or
use its best  efforts  to  cause to be  delivered  to the  Underwriter  manually
executed originals of the documents listed below in subparagraphs (a), (b), (d),
(e) and  (g),  a copy of the  document  listed  below  in  subparagraph  (c) and
certified copies of the documents listed below in subparagraph (f):

                  (a)      the Indenture;

                  (b)      the Reimbursement Agreement;

                  (c) the Letter of  Credit,  issued by the Bank in favor of the
         Trustee  in an  amount  equal to at least the  principal  amount of the
         Bonds and 45 days'  interest  thereon  calculated at the rate of 12% on
         the basis of a 365/366 day year;

                  (d)      the Loan Agreement;

                  (e) the Tax Regulatory  Agreement,  dated as of August 1, 1997
         (the "Tax Regulatory Agreement"), among the Authority, the Borrower and
         the Trustee;

                  (f) (i) the resolution of the Authority,  adopted on April 30,
         1997,  expressing the  Authority's  intention to issue the Bonds and to
         reimburse certain  expenditures  incurred by the Borrower from proceeds
         of the Bonds,  certified by the  Secretary of the  Authority,  (ii) the
         resolution of the Authority,  adopted on June 20, 1997, authorizing the
         issuance, sale and delivery of the Bonds and the execution and delivery
         of the Indenture,  the Loan Agreement, the Tax Regulatory Agreement and
         this Purchase  Contract,  certified by the Secretary of the  Authority,
         and (iii) the resolution of the California  Infrastructure and Economic
         Development Bank (the "Infrastructure Bank"), adopted June 20, 1997,


                                        2

<PAGE>



          approving the issuance of the Bonds by the Authority, certified by the
          Secretary of the Infrastructure Bank; and

                  (g) the Official Statement.

         By execution of this Purchase  Contract,  the Authority consents to the
use  by the  Underwriter  of all of the  above  documents  and  the  information
contained therein in connection with the public offering of the Bonds.

         6. The Authority represents and warrants to the Underwriter that:

                  (a) The Authority is a body public and corporate, and a public
         instrumentality of the State of California (the "State"), organized and
         existing  under the laws of the State,  specifically  Section  15710 et
         seq. of the California  Government Code, as amended, with all necessary
         power and  authority  to issue  the  Bonds  and to enter  into the Loan
         Agreement  for the purpose of promoting  and  encouraging  commerce and
         industry, and generally to foster economic development in the State; to
         enter  into  the  Indenture,  the Tax  Regulatory  Agreement  and  this
         Purchase  Contract;  to  issue,  sell  and  deliver  the  Bonds  to the
         Underwriter  as provided  herein;  and to carry out and  consummate all
         other transactions contemplated by each of the aforesaid documents.

                  (b) The  Authority  has duly  authorized,  by all  appropriate
         action,  and complied  with all  provisions of law with respect to, the
         execution and delivery of the Indenture,  the Loan  Agreement,  the Tax
         Regulatory Agreement and this Purchase Contract and the issuance, sale,
         execution and delivery of the Bonds.

                  (c)  When  delivered  to and paid  for by the  Underwriter  in
         accordance with the terms of this Purchase  Contract and the Indenture,
         the  Bonds  will  have  been  duly and  validly  authorized,  executed,
         authenticated,   issued  and   delivered  by  the  Authority  and  will
         constitute  legal,  valid  and  binding  limited   obligations  of  the
         Authority  enforceable  in  accordance  with  their  terms,  subject to
         applicable  bankruptcy,  insolvency or other laws affecting  creditors'
         rights  and  remedies,  and will be  entitled  to the  benefits  of the
         Indenture.

                  (d) The  execution and delivery of the Bonds,  the  Indenture,
         the Loan  Agreement,  the Tax  Regulatory  Agreement  and this Purchase
         Contract,  and compliance with the provisions  thereof, do not and will
         not  conflict  with,  or  constitute  on the  part of the  Authority  a
         violation of, breach of or default under any indenture,  mortgage, deed
         of trust,  resolution,  note agreement or other agreement or instrument
         to which the  Authority is a party or by which the  Authority is bound,
         or, to its knowledge,  any  constitutional  provision or statute of the
         State or of the United States of America, any order, rule or regulation
         of any court or governmental  agency or body having  jurisdiction  over
         the Authority or any of its activities or properties;  and all consents
         of any  governmental  authority of the State or of the United States of
         America  required in connection  with the issuance or sale of the Bonds
         by the Authority have been obtained;


                                        3

<PAGE>



         provided, however, that no representation is made concerning compliance
         with the federal  securities  laws or the securities or "Blue Sky" laws
         of the various states.

                  (e)  There  is  no  action,  suit,   proceeding,   inquiry  or
         investigation,  at law or in  equity,  or  before  or by any  court  or
         governmental  agency or body pending or, to the best of its  knowledge,
         threatened  against or affecting the Authority,  nor to the best of its
         knowledge is there any basis therefor, wherein an unfavorable decision,
         ruling or finding would  materially  adversely  affect the transactions
         contemplated  by  this  Purchase  Contract,  the  Indenture,  the  Loan
         Agreement or the Tax Regulatory Agreement,  or which, in any way, would
         adversely  affect the  validity  or  enforceability  of the Bonds,  the
         Indenture,  the Loan  Agreement,  the Tax Regulatory  Agreement or this
         Purchase  Contract or any other  agreement or  instrument  to which the
         Authority is a party,  used or contemplated for use in the consummation
         of  the  transactions  contemplated  by  this  Purchase  Contract,  the
         Indenture, the Loan Agreement or the Tax Regulatory Agreement.

                  (f) The  Authority  will not  take or omit to take any  action
         which action or omission  will in any way cause the  proceeds  from the
         sale of the Bonds to be applied in a manner  contrary to that  provided
         for in the Indenture.

                  (g) The Authority has reviewed the statements contained in the
         Official  Statement  relating to the  Authority  under the caption "THE
         AUTHORITY"  and  such  statements,  insofar  as  they  are  within  the
         knowledge of the Authority,  are true and correct and fairly  summarize
         the  matters  encompassed  thereby  to  the  extent  such  matters  are
         described  therein.  If between the date of this Purchase  Contract and
         the date of the Closing (as hereinafter  defined) any event shall occur
         which,  in the  opinion  of the  Authority,  might or would  cause  the
         Official  Statement as then  supplemented  or amended to contain,  with
         respect to statements  contained in the Official  Statement relating to
         the Authority under the caption "THE  AUTHORITY",  any untrue statement
         of a material fact or omit to state any material fact necessary to make
         the statements  therein,  in the light of the circumstances under which
         they  were  made,  not  misleading,  the  Authority  shall  notify  the
         Underwriter,  and if in the opinion of the Authority or the Underwriter
         such event requires the  preparation and publication of a supplement or
         amendment to the Official Statement,  the Authority,  at the expense of
         the Borrower, will supplement or amend the Official Statement in a form
         and in a manner approved by the Underwriter.

         7. At 11:00 A.M.,  New York time,  on August 5, 1997,  or at such other
time or on such earlier or later business day as shall have been mutually agreed
upon by the  Authority,  the Borrower and the  Underwriter,  the Authority  will
deliver or cause to be delivered to the  Underwriter  the Bonds,  in  definitive
fully registered form, duly executed and authenticated,  at a place in New York,
New York, to be mutually agreed upon by the Authority and the  Underwriter.  The
Authority  will  deliver  or cause to be  delivered  to the  Underwriter  in Los
Angeles, California, at such time and on such date and at a place to be mutually
agreed upon by the  Authority,  the  Borrower and the  Underwriter,  the closing
documents  mentioned  paragraph 7(b) hereof.  The  Underwriter  will accept such
delivery  and pay the  purchase  price of the Bonds as set forth in  Paragraph 2
hereof,  by a Federal  Funds check or wire transfer to the order of "First Trust
of California, National Association, as Trustee" unless the Authority


                                        4

<PAGE>



shall  otherwise  direct.  This  payment  and  delivery  is  herein  called  the
"Closing." The Bonds will be delivered in authorized  denominations as set forth
in the  Indenture  and  registered  in the name of CEDE & Co., as nominee of The
Depository  Trust Company or in such other names as the  Underwriter  shall have
requested.  The Bonds will be made available to the Underwriter for checking and
packaging by the  Underwriter  at least one business day before the Closing at a
place to be mutually agreed upon by the Authority and the Underwriter.

         8. The Underwriter's  obligations hereunder to purchase and pay for the
Bonds shall be subject to the performance by the Authority of the obligations to
be performed by it hereunder at or prior to the Closing,  to the  performance by
the Borrower of the  obligations  and agreements to be performed by the Borrower
at or prior  to the  Closing  under  the  Letter  of  Representation  and to the
accuracy in all material respects of the  representations  and warranties of the
Authority  contained  herein  and of the  Borrower  contained  in the  Letter of
Representation,  as of the date hereof and as of the Closing,  and shall also be
subject to the following conditions:

                  (a) At the time of the Closing (i) the  Indenture,  the Letter
         of Credit,  the Loan Agreement,  the Reimbursement  Agreement,  the Tax
         Regulatory  Agreement and the Letter of Representation shall be in full
         force  and  effect,  and  shall  not have  been  amended,  modified  or
         supplemented  except  as may have  been  agreed  to in  writing  by the
         Underwriter; and (ii) the Authority shall perform or have performed all
         of its  obligations  required  under  or  specified  in  this  Purchase
         Contract to be performed at or prior to the Closing.

                  (b) The Bonds shall have been duly  authorized,  executed  and
         authenticated in accordance with the provisions of the Indenture.

                  (c) The  Underwriter  may terminate this Purchase  Contract by
         notification  to the  Authority if at any time  subsequent  to the date
         hereof and at or prior to the Closing (i)  legislation  shall have been
         enacted  by the  United  States  or shall  have  been  reported  out of
         committee or being  considered  by any committee of the Congress of the
         United States, or a decision shall have been rendered by a court of the
         United States or the Tax Court of the United States,  or a ruling shall
         have been made or a  regulation  or a temporary  regulation  shall have
         been proposed or made or any other release or  announcement  shall have
         been  made by the  Treasury  Department  of the  United  States  or the
         Internal  Revenue  Service,  with  respect  to  federal  taxation  upon
         revenues or other  income or payments  of the general  character  to be
         derived by the State or upon interest  received on  obligations  of the
         general character of the Bonds,  which in the reasonable opinion of the
         Underwriter materially adversely affects the market for the Bonds; (ii)
         there  shall have  occurred  any new  outbreak  of  hostilities  or any
         national  or  international  calamity  or  crisis,  the  effect of such
         outbreak,  calamity  or  crisis  being  such  as  could  cause  a major
         disruption  in the debt markets and as, in the  reasonable  judgment of
         the Underwriter, would make it impracticable for it to market the Bonds
         or to enforce contracts for the sale of the Bonds; (iii) there shall be
         in  force  a  general  suspension  of  trading  on The New  York  Stock
         Exchange,  Inc.,  or minimum or maximum  prices for trading  shall have
         been fixed and be in force, or maximum ranges for prices for securities
         shall  have  been  required  and be in  force  on The  New  York  Stock
         Exchange,


                                        5

<PAGE>



         Inc., whether by virtue of a determination by that exchange or by order
         of the  Securities  and Exchange  Commission or any other  governmental
         authority having jurisdiction;  (iv) a general banking moratorium shall
         have been  declared by federal,  New York,  or  California  authorities
         having  jurisdiction  and be in  force;  or (v) any  event  shall  have
         occurred or shall exist which  makes  untrue or  incorrect,  as of such
         time, in any material  respect,  any material  statement or information
         contained  in the Official  Statement or which is not  reflected in the
         Official  Statement,  but should be reflected  therein in order to make
         such  material   statements  and  information   contained  therein  not
         misleading as of such time.

                  (d) At or prior to the Closing,  the Underwriter shall receive
         the following documents:

                           (1)  The  approving  opinion  of  Kutak  Rock  ("Bond
                  Counsel"),  relating  to the  Bonds,  dated  the  date  of the
                  Closing,  in the form set forth as Appendix A to the  Official
                  Statement,  together with a letter of Bond Counsel,  dated the
                  date of the Closing and addressed to the  Underwriter  stating
                  that the Underwriter may rely on such opinion.

                           (2) The  supplemental  opinion of Bond Counsel  dated
                  the date of the Closing and addressed to the  Underwriter,  to
                  the effect that:

                                    (i) this  Purchase  Contract  has been  duly
                           authorized,  executed and  delivered by the Authority
                           and,  assuming  due   authorization,   execution  and
                           delivery  by  the  Underwriter  and  approval  by the
                           Borrower,  is a valid and  binding  agreement  of the
                           Authority,  subject to laws  relating to  bankruptcy,
                           insolvency,   reorganization   or  creditors'  rights
                           generally  and  to  the   application   of  equitable
                           principles;

                                    (ii)  the   statements   contained   in  the
                           Official  Statement in the sections thereof entitled:
                           "DESCRIPTION OF THE BONDS," "SECURITY FOR THE BONDS,"
                           "THE  LOAN   AGREEMENT,"  "THE  INDENTURE"  and  "TAX
                           MATTERS"  insofar  as  such  statements   purport  to
                           summarize  certain  provisions of the Bonds, the Loan
                           Agreement  or  the  Indenture,   and  Bond  Counsel's
                           opinion  concerning  certain tax matters  relating to
                           the Bonds are accurate in all material respects; and

                                    (iii)  the  Bonds  are  not  subject  to the
                           registration  requirements  of the  Securities Act of
                           1933,  as amended,  and the  Indenture is exempt from
                           qualification  as an indenture  pursuant to the Trust
                           Indenture Act of 1939, as amended.

                           (3) The opinion of counsel to the Borrower, which may
                  be rendered by one or more firms  acceptable  to the Authority
                  and the Underwriter, dated the date of the closing and in form
                  and substance acceptable to the Authority and the Underwriter.


                                        6

<PAGE>




                           (4) A  certificate  dated the date of the  Closing of
                  the Chair of the Authority,  or the Chair's  designee,  to the
                  effect that as of such date,  (a) no litigation is pending or,
                  to his knowledge,  threatened in any court (i) challenging the
                  creation,  organization  or existence of the  Authority,  (ii)
                  seeking to restrain or enjoin the  issuance or delivery of any
                  of the Bonds,  or the  collection  of revenues or other moneys
                  pledged or to be pledged to pay the  principal of and interest
                  on the  Bonds,  or in any  way  contesting  or  affecting  the
                  validity of the Bonds or the  Indenture or the  collection  of
                  revenues or other moneys or the pledge thereof,  or contesting
                  the  powers  of the  Authority  to issue the Bonds or to enter
                  into the  Indenture,  (iii) in any way contesting or affecting
                  the  validity  of  the  Loan  Agreement,  the  Tax  Regulatory
                  Agreement or this Purchase Contract,  or contesting the powers
                  of the  Authority  to enter into or to execute and deliver the
                  Loan Agreement,  the Tax Regulatory Agreement or this Purchase
                  Contract,  (b)  the  representations  and  warranties  of  the
                  Authority  contained  herein  are  true  and  correct  in  all
                  material  respects  on and as of the date of the Closing as if
                  made on the  date of the  Closing;  and (c) to the best of his
                  knowledge, no event affecting the Authority has occurred since
                  the  date  of  the  Official  Statement  which  has  not  been
                  disclosed  therein or by supplement  or amendment  thereto and
                  which should be disclosed  in the Official  Statement  for the
                  purpose for which it is to be used or which it is necessary to
                  disclose   therein  in  order  to  make  the   statements  and
                  information therein not misleading in any material respect.

                           (5) An  opinion,  dated the date of the  Closing  and
                  addressed to the Underwriter,  the Authority, Bond Counsel and
                  Standard & Poor's  Ratings  Services  ("Standard & Poor's") of
                  United  States  and  Japanese  counsel to the Bank in form and
                  substance acceptable to the Underwriter,  the Authority,  Bond
                  Counsel and Standard & Poor's.

                           (6) A  certificate  of an  authorized  officer of the
                  Bank,  dated the date of the  Closing,  to the effect that the
                  information  under the captions  "THE BANK" and "THE LETTER OF
                  CREDIT  AND  THE  REIMBURSEMENT  AGREEMENT"  in  the  Official
                  Statement does not contain any untrue  statement of a material
                  fact or omit to state a material  fact  necessary  to make the
                  statements   made  under  such   caption,   in  light  of  the
                  circumstances under which they were made, not misleading.

                           (7) A  preference  opinion,  dated  the  date  of the
                  Closing, of Bond Counsel, addressed to Standard & Poor's.

                           (8) A certificate of the Borrower,  dated the date of
                  the  Closing  and  signed  by an  authorized  officer  of  the
                  Borrower,  acting  solely  in his  official  capacity,  to the
                  effect that (i) since the date hereof no material  and adverse
                  change has  occurred in the  financial  position or results of
                  operations of the Borrower;  (ii) the Borrower has not,  since
                  the date hereof,  incurred any material liabilities other than
                  in the  ordinary  course  of  business  or as set  forth in or
                  contemplated  by  the  Official  Statement;   (iii)  no  event
                  affecting the Borrower has


                                        7

<PAGE>



                  occurred since the date of the Official Statement which should
                  be  disclosed in the  Official  Statement  for the purpose for
                  which it is to be used or which is  necessary  to be disclosed
                  therein  in  order  to make  the  statements  and  information
                  therein  in light of the  circumstances  under  which they are
                  made not  misleading  as of the date of Closing;  and (iv) the
                  representations  and  warranties  included  in the  Letter  of
                  Representation  are true and correct in all material  respects
                  as of the  date  of the  Closing,  and all  obligations  to be
                  performed by the Borrower  under the Letter of  Representation
                  on or prior to the date of the Closing have been performed.

                           (9) The Official Statement signed on behalf of the
                  Authority.

                           (10) Executed counterparts of the Indenture, the Loan
                  Agreement,   the  Remarketing  Agreement,   the  Reimbursement
                  Agreement  and the Tax  Regulatory  Agreement and specimens of
                  the Letter of Credit and the Bonds.

                           (11) Copies of the  resolutions or other documents of
                  the Borrower  authorizing  the  execution  and delivery of the
                  Loan Agreement,  the Reimbursement  Agreement, the Remarketing
                  Agreement,   the  Letter  of   Representations   and  the  Tax
                  Regulatory  Agreement,   certified  by  the  Secretary  or  an
                  Assistant  Secretary  of the  Borrower  as  having  been  duly
                  adopted and being in full force and effect.

                           (12)  Copies  of the  resolutions  of  the  Authority
                  authorizing the issuance of the Bonds, the use of the Official
                  Statement  and  authorizing  or approving  the  execution  and
                  delivery of the  documents to which the  Authority is a party,
                  certified by the  Secretary of the  Authority,  as having been
                  duly adopted and being in full force and effect.

                           (13) A certificate  of a duly  authorized  officer of
                  the Authority satisfactory to the Underwriter,  dated the date
                  of Closing, stating that such officer is charged, either alone
                  or with others, with the responsibility for issuing the Bonds;
                  setting  forth,  in  the  manner  permitted  by  the  Treasury
                  Regulations  and  the  Internal  Revenue  Code  of  1986  (the
                  "Code"),  the reasonable  expectations  of the Authority as of
                  such  date as to the use of  proceeds  of the Bonds and of any
                  other funds of the Authority pledged or expected to be used to
                  pay  principal  or  purchase  price of,  premium,  if any,  or
                  interest  on the Bonds and the  facts and  estimates  on which
                  such  expectations are based; and stating that, to the best of
                  the  knowledge  and  belief  of the  certifying  officer,  the
                  Authority's  expectations are reasonable,  which certification
                  may be made in reliance  upon a similar  certification,  dated
                  the date of the  Closing,  furnished  to such  person for such
                  purpose by a duly authorized officer or  attorneys-in-fact  of
                  the Borrower satisfactory to the Underwriter.

                           (14) An opinion of  counsel to the  Authority,  dated
                  the date of the  Closing,  addressed to the  Underwriter,  the
                  Trustee and Bond Counsel, in form and substance  acceptable to
                  the Underwriter, the Trustee and Bond Counsel.


                                        8

<PAGE>




                           (15) The letter from Standard & Poor's indicating the
                  rating for the Bonds which is not lower than "A/A-1."

                           (16) Evidence  satisfactory to the  Underwriter  that
                  the Bonds have been  approved by the  Governor of the State or
                  other  appropriate  official or governing body, after a public
                  hearing  thereon  held  after  reasonable   public  notice  in
                  accordance with Section 147(f) of the Code.

                           (17)  Evidence of the filing,  as required by Section
                  149(e) of the Code, of Form 8038.

                           (18)  A  certified  copy  of  the  resolution  of the
                  California  Debt  Limit  Allocation   Committee  granting  the
                  Authority  a portion of the  State's  volume cap for the Bonds
                  equal to at least the amount of the Bonds purchased pursuant
                  to this Purchase Contract.

                           (19) Such  additional  certificates,  instruments and
                  other  documents  as  the  Underwriter   reasonably  may  deem
                  necessary to evidence the truth and accuracy as of the time of
                  the  Closing  of the  representations  of the  Authority,  the
                  Borrower and the Bank and the due  performance or satisfaction
                  by the  Authority,  the  Borrower  and the Bank at or prior to
                  such  time  of all  agreements  then to be  performed  and all
                  conditions then to be satisfied by the Authority, the Borrower
                  and the Bank.

         If the Authority shall be unable to satisfy the conditions contained in
this  Purchase  Contract,  or if the  obligations  of the  Underwriter  shall be
terminated  for any reason  permitted by this Purchase  Contract,  this Purchase
Contract shall  terminate and neither the Underwriter nor the Authority shall be
under further obligation hereunder, except as set forth in Paragraph 10.

         9. The Authority  covenants  with the  Underwriter to cooperate with it
and the Borrower in qualifying the Bonds for offer and sale under the securities
or "Blue Sky" laws of such States as the Underwriter may request;  provided that
in no event shall the  Authority  be  obligated  to take any action  which would
subject  it to general  service  of process in any State  where it is not now so
subject.  It is understood  that the Authority is not responsible for compliance
with or the consequences of failure to comply with applicable "Blue Sky" laws.

         10.  (a) The  Underwriter  shall  be  under  no  obligation  to pay any
expenses incident to the performance of the Authority's  obligations  hereunder,
including  but not  limited  to (i) the  cost of  printing  and  delivering  and
preparation for printing or other  reproduction of the Indenture,  the Letter of
Credit, the Loan Agreement, the Reimbursement Agreement, this Purchase Contract,
the  Letter  of  Representation,  the  Remarketing  Agreement  and the  Official
Statement;  (ii) the fees and  disbursements  of Bond  Counsel,  counsel  to the
Authority  and any  experts or  consultants  retained  by the  Authority  or the
Borrower;  (iii) the fees and disbursements of the Bank and its counsel and (iv)
the  fees of  Standard  &  Poor's.  The  costs  and  expenses  set  forth in the
immediately  preceding  sentence shall be paid out of the proceeds of the Bonds,
or other


                                        9

<PAGE>



available funds of the Borrower in accordance with the Indenture or if the Bonds
are not delivered to the  Underwriter by the Authority  (unless such delivery be
prevented by the Underwriter's default hereunder, in which event the Underwriter
shall pay such costs and  expenses  as and for  liquidated  damages  hereunder),
shall be paid by the Borrower pursuant to the Letter of Representation.

         (b)  The  Underwriter  shall  pay  (i)  all  advertising   expenses  in
connection  with the public  offering  of the Bonds and (ii) all other  expenses
incurred by it in connection  with the public  offering and  distribution of the
Bonds.

         11.  Any  notice or other  communication  to be given to the  Authority
under this Purchase  Contract may be given by delivering  the same in writing at
its address set forth above, addressed Attention:  Chair, and any such notice or
other  communication  to be given to the  Underwriter may be given by delivering
the same to Rauscher Pierce Refsnes,  Inc., 117 East Colorado  Boulevard,  Suite
210, Pasadena,  California 91105. All notices or communications hereunder by any
party shall be given and served upon each other party.

         12.  This  Purchase  Contract  shall  constitute  the entire  agreement
between the Authority,  the Treasurer and the Underwriter and is made solely for
the benefit of the Authority,  the Borrower and the  Underwriter  (including the
successors or assigns of the Underwriter). No other person shall acquire or have
any rights hereunder or by virtue hereof.  All  representations,  warranties and
agreements of the Authority in this Purchase Contract shall remain operative and
in full force and  effect,  regardless  of (a) any  investigation  made by or on
behalf  of the  Underwriter,  (b) the  delivery  of any  payment  for the  Bonds
hereunder and (c) any termination of this Purchase Contract.  The parties hereto
agree to cooperate  prior and  subsequent to the Closing to take such actions as
shall be necessary or desirable in  connection  with  securing the rating of the
Bonds by Standard & Poor's.

         13.  This  Purchase  Contract  may not be amended  without  the written
consent of the Authority, the Treasurer and the Borrower.


                                       10

<PAGE>



         14. The  validity,  interpretation  and  performance  of this  Purchase
Contract shall be governed by the laws of the State of California.


                                     RAUSCHER PIERCE REFSNES, INC.


                                     By:______________________________________
                                           Managing Director




                                     CALIFORNIA ECONOMIC DEVELOPMENT
                                     FINANCING AUTHORITY


                                     By:______________________________________
                                            Chair


Attest:


By:_________________________________
           Secretary


                                      OFFICE OF THE STATE TREASURER


                                      By:_____________________________________
                                            Deputy Treasurer

Agreed to and Approved by:

ADVANCED AERODYNAMICS AND
STRUCTURES, INC.


By:_______________________________
      Authorized Signatory


<PAGE>



                                    EXHIBIT A

                            Letter of Representation

                                 August 4, 1997

California Economic Development Financing Authority
801 K Street, Suite 1700
Sacramento, California 91584

The Honorable Matt Fong
Treasurer of the State of California
915 Capitol Mall, Room 110
Sacramento, California 95814

Rauscher Pierce Refsnes, Inc.
117 East Colorado Boulevard, Suite 210
Pasadena, California  91105

Ladies and Gentlemen:

         Pursuant to a purchase  contract  dated the date hereof (the  "Purchase
Contract"),  with Rauscher Pierce Refsnes,  Inc. (the "Underwriter"),  which the
undersigned (the "Borrower") has approved,  the California Economic  Development
Financing  Authority  (the  "Authority")  and  the  Treasurer  of the  State  of
California  propose  to  sell  $8,500,000  aggregate  principal  amount  of  the
Authority's  Variable Rate Demand Industrial  Development  Revenue Bonds, Series
1997 (Advanced  Aerodynamics and Structures,  Inc.  Project) (the "Bonds").  The
offering of the Bonds is  described  in an official  statement,  dated August 4,
1997 (the "Official Statement").

         Certain revenues and other moneys received by the Authority pursuant or
with  respect  to the Loan  Agreement,  dated as of August  1,  1997 (the  "Loan
Agreement"),  between the  Authority  and the Borrower will be pledged to secure
the  payment  of the  Bonds,  including  the  interest  thereon  pursuant  to an
Indenture  of Trust,  dated as of August 1, 1997 (the  Indenture"),  between the
Authority and First Trust of California,  National Association,  as trustee (the
"Trustee"),  relating to the Bonds. In addition, the Bonds shall be payable from
funds drawn  under an  irrevocable  direct pay letter of credit (the  "Letter of
Credit")  issued by The  Sumitomo  Bank,  Ltd.,  acting  through its Los Angeles
Branch, (the "Bank"), pursuant to a Reimbursement Agreement,  dated as of August
1, 1997 (the "Reimbursement Agreement"), between the Borrower and the Bank.

         In order to induce you to enter into the Purchase  Contract and to make
the sale and purchase and  reoffering  of the Bonds  therein  contemplated,  the
Borrower hereby represents, warrants and agrees with each of you as follows:

                  (1) The  Borrower  is a  corporation,  organized  and  validly
         existing under the laws of the State of Delaware, has full legal right,
         power and authority to enter into this


                                       A-1

<PAGE>



         Letter  of  Representation,   the  Loan  Agreement,  the  Reimbursement
         Agreement  and the  Remarketing  Agreement,  to  approve  the  Purchase
         Contract and to carry out and consummate all transactions  contemplated
         by this Letter of Representation, the Loan Agreement, the Reimbursement
         Agreement,  the Remarketing Agreement, the Tax Regulatory Agreement and
         the Purchase  Contract  and by proper  action has duly  authorized  the
         execution  and  delivery  of this  Letter of  Representation,  the Loan
         Agreement,  the Reimbursement  Agreement,  the Tax Regulatory Agreement
         and  the  Remarketing  Agreement  and  the  approval  of  the  Purchase
         Contract.

                  (2) The  officer  of the  Borrower  executing  this  Letter of
         Representation, the Loan Agreement, the Reimbursement Agreement and the
         Remarketing  Agreement and approving the Purchase  Contract is duly and
         properly authorized to execute the same.

                  (3) The Purchase  Contract has been duly approved by, and this
         Letter  of  Representation,   the  Loan  Agreement,  the  Reimbursement
         Agreement,  the Tax Regulatory Agreement and the Remarketing  Agreement
         have been duly authorized,  executed and delivered by the Borrower. The
         Loan Agreement, when assigned to the Trustee pursuant to the Indenture,
         will constitute the legal, valid and binding obligation of the Borrower
         to the Trustee  enforceable against the Borrower in accordance with its
         terms for the benefit of the owners of the Bonds; except as enforcement
         of  the  Loan  Agreement  may be  limited  by  bankruptcy,  insolvency,
         moratorium, reorganization,  fraudulent conveyance laws, laws affecting
         the  enforcement  of creditors  rights,  the  application  of equitable
         principles and judicial  discretion,  and by the covenant of good faith
         and fair  dealing  which may be  implied  by law into  contracts.  This
         Letter of Representation,  the Reimbursement Agreement, the Remarketing
         Agreement  and the Tax  Regulatory  Agreement  and  any  rights  of the
         Authority and  obligations of the Borrower under the Loan Agreement not
         so assigned to the Trustee will constitute the legal, valid and binding
         agreements  of  the  Borrower   enforceable  against  the  Borrower  in
         accordance with their respective  terms;  except as enforcement of each
         of the above-named documents may be limited by bankruptcy,  insolvency,
         moratorium, reorganization,  fraudulent conveyance laws, laws affecting
         the  enforcement  of creditors  rights,  the  application  of equitable
         principles and judicial  discretion,  and by the covenant of good faith
         and fair dealing which may be implied by law into contracts.

                  (4) The  Borrower is not in any  material  way in breach of or
         default under (i) any  applicable law or  administrative  regulation of
         the State of California or the United States or any applicable judgment
         or decree or (ii) any material loan agreement,  indenture,  bond, note,
         resolution,  agreement or other instrument to which it is a party or is
         otherwise  subject,  and no event has occurred and is continuing which,
         with the  passage  of time or the  giving  of  notice  or  both,  would
         constitute an event of default under any such instrument.

                  (5) The  approval of the  Purchase  Contract  and the Official
         Statement;  the  execution  and  delivery  of the Loan  Agreement,  the
         Reimbursement  Agreement, the Tax Regulatory Agreement, the Remarketing
         Agreement and this Letter of  Representation;  the  consummation of the
         transactions herein and therein contemplated; and the fulfillment


                                       A-2

<PAGE>



         of or compliance with the terms and conditions  hereof and thereof will
         not  conflict  with or  constitute  a violation or breach of or default
         (with due notice or the passage of time or both)  under the  Borrower's
         Organization Documents (as defined in the Indenture), or any applicable
         law or  administrative  rule or regulation,  or any applicable court or
         administrative  decree or order,  or, to the knowledge of the Borrower,
         any indenture, mortgage, deed of trust, loan agreement, lease, contract
         or other  agreement or instrument to which it is a party or by which it
         or its  properties  are  otherwise  subject or bound,  or result in the
         creation or imposition of any prohibited lien, charge or encumbrance of
         any  nature  whatsoever  upon  any  of  the  Borrower's  assets,  which
         conflict, violation, breach, default, lien, charge or encumbrance might
         have  consequences  that  would  materially  and  adversely  affect the
         consummation of the transactions contemplated by the Purchase Contract,
         the Indenture,  the Loan Agreement,  the Reimbursement  Agreement,  the
         Remarketing  Agreement,  the Tax Regulatory  Agreement,  this Letter of
         Representation  or the Official  Statement or the financial  condition,
         assets, properties or operations of the Borrower.

                  (6) No consent  or  approval  of any  trustee or holder of any
         indebtedness   of   the   Borrower,   and   no   consent,   permission,
         authorization, order or license of, or filing or registration with, any
         governmental authority (except in connection with Blue Sky proceedings)
         is  necessary in  connection  with the  execution  and delivery of this
         Letter  of  Representation,   the  Loan  Agreement,  the  Reimbursement
         Agreement,  the Tax Regulatory Agreement or the Remarketing  Agreement;
         the  approval of the  Purchase  Contract;  or the  consummation  of any
         transaction therein or herein contemplated on the part of the Borrower,
         except  as have  been  obtained  or made and as are in full  force  and
         effect  or, as  appropriate,  will be in full  force and  effect at the
         Closing.  The Borrower makes no  representation  as to any approvals or
         actions  as may  be  required  under  any  state  Blue  Sky or  federal
         securities laws.

                  (7)  There  is  no  action,  suit,   proceeding,   inquiry  or
         investigation  before or by any court or federal,  state,  municipal or
         other  government  authority  pending  or,  to  the  knowledge  of  the
         Borrower,  threatened  against or affecting the Borrower or its assets,
         properties or operations which, if determined adversely to the Borrower
         or the interests thereof, would have a material and adverse effect upon
         the consummation of the transactions contemplated by or the validity of
         the Purchase Contract, the Loan Agreement, the Reimbursement Agreement,
         the Remarketing Agreement, the Tax Regulatory Agreement, this Letter of
         Representation  or  the  Official   Statement  or  upon  the  financial
         condition,  assets,  properties or operations of the Borrower,  and the
         Borrower is not in default  with  respect to any order or decree of any
         court  or any  order,  regulation  or  demand  of any  federal,  state,
         municipal  or  other  governmental   authority,   which  default  would
         materially and adversely  affect the  consummation of the  transactions
         contemplated  by  the  Purchase  Contract,  the  Loan  Agreement,   the
         Reimbursement  Agreement, the Remarketing Agreement, the Tax Regulatory
         Agreement, this Letter of Representation, the Official Statement or the
         financial condition, assets, properties or operations of the Borrower.



                                       A-3

<PAGE>



                  (8) The  Borrower  has  obtained or will obtain all  variances
         from  applicable  zoning  ordinances and has obtained or will obtain in
         due course all  building  permits and  easements  or  licenses  for the
         acquisition, construction and equipping of the Project (as said term is
         defined  in the  Indenture),  to the  extent  and as  such  Project  is
         described  in the  Official  Statement,  and such  variances,  permits,
         easements  and  licenses  constitute  all  approvals  required  for the
         Project;  and the  Project  should  not be  subject  to  change  by any
         administrative  or  judicial  body  so as  to  materially  affect  such
         acquisition  and  construction.  The  Project  has  complied  with  the
         requirements of the California Environmental Quality Act.

                  (9) The Borrower  hereby agrees to pay the expenses  described
         in Paragraph  10(a) of the Purchase  Contract,  and to pay any expenses
         incurred in amending or supplementing the Official  Statement  pursuant
         to the Purchase Contract.

                  (10) As of the date hereof, the Official Statement, as amended
         or  supplemented  pursuant to the  Purchase  Contract or this Letter of
         Representation,  if applicable, does not and will not contain as of the
         Closing  any untrue  statement  of a  material  fact or omit to state a
         material  fact  required to be stated  therein or necessary to make the
         statements  therein, in the light of the circumstances under which they
         were made, not misleading.

                  (11) If between  the date  hereof and the date of the  Closing
         any  event  shall  occur  which  might  or  would  cause  the  Official
         Statement,  as then  supplemented  or  amended,  to  contain  an untrue
         statement  of a  material  fact  or to omit to  state a  material  fact
         required  to be stated  therein  or  necessary  to make the  statements
         therein,  in the light of the circumstances under which they were made,
         not  misleading,  the  Borrower  shall  notify  the  Authority  and the
         Underwriter and if in the opinion of the Borrower, the Authority or the
         Underwriter  such event requires the  preparation  and publication of a
         supplement or amendment to the Official  Statement,  the Authority will
         request the Borrower to cause the  Official  Statement to be amended or
         supplemented in a form and in a manner approved by the Underwriter.

                  (12) After the Closing,  the Borrower (a) will not participate
         in the  issuance of any  amendment  of or  supplement  to the  Official
         Statement to which,  after being furnished with a copy, the Underwriter
         or the Authority shall  reasonably  object in writing or which shall be
         disapproved by counsel for the  Underwriter or the Authority and (b) if
         any event relating to or affecting the Authority or the Borrower or its
         present or proposed  facilities  shall occur as a result of which it is
         necessary,  in the  opinion  of  counsel  for  the  Underwriter  or the
         Authority,  to amend or supplement  the Official  Statement in order to
         make  the  Official  Statement  not  misleading  in  the  light  of the
         circumstances  existing  at the time it is  delivered  to a  purchaser,
         forthwith  prepare and furnish to the Underwriter and the Authority (at
         the  expense  of the  Borrower)  a  reasonable  number  of copies of an
         amendment  of or  supplement  to the  Official  Statement  (in form and
         substance  satisfactory  to counsel for the  Underwriter and counsel to
         the Authority) which will amend or supplement the Official Statement so
         that it will not contain an untrue statement of a material fact or omit
         to state a  material  fact  necessary  in order to make the  statements
         therein,  in the light of the  circumstances  existing  at the time the
         Official Statement is


                                       A-4

<PAGE>



         delivered  to  purchaser,  not  misleading.  For the  purposes  of this
         subsection,   the   Authority   and  the  Borrower  will  furnish  such
         information  as the  Underwriter  may  from  time  to  time  reasonably
         request.

                  (13) The Borrower  agrees to indemnify  and hold  harmless the
         Authority and the Underwriter and each person, if any, who controls (as
         such term is defined in Section 15 of the  Securities  Act of 1933,  as
         amended) the Authority and the Underwriter and their officers,  agents,
         employees,  advisors  and  attorneys  against  any and  all  judgments,
         losses,  claims,  damages,  liabilities and expenses (i) arising out of
         any statement or information in the Official Statement, relating to the
         Borrower  and  the  Project,  that is or is  alleged  to be  untrue  or
         incorrect in any material  respect or the omission or alleged  omission
         therefrom of any statement or information that should be stated therein
         or that is necessary  to make the  statements  therein  relating to the
         Borrower and the Project not  misleading in any material  respect,  and
         (ii) to the extent of the  aggregate  amount paid in  settlement of any
         litigation  commenced or threatened arising from a claim based upon any
         such untrue  statement or omission if such  settlement is effected with
         the written consent of the Borrower. In case any claim shall be made or
         action  brought  against  the  Authority  or  the  Underwriter  or  any
         controlling   person  based  upon  the  Official  Statement  for  which
         indemnity may be sought against the Borrower,  as provided above,  such
         party shall promptly  notify the Borrower in writing  setting forth the
         particulars  of such claim or action and the Borrower  shall assume the
         defense thereof,  including the retaining of counsel acceptable to such
         party  and  the  payment  of  all  expenses.   The  Authority  and  the
         Underwriter  or any such  controlling  person  shall  have the right to
         retain  separate  counsel in any such action and to  participate in the
         defense  thereof but shall bear the fees and  expenses of such  counsel
         unless  (i)  the  Borrower  shall  have  specifically   authorized  the
         retaining of such counsel or (ii) the parties to such suit include such
         Underwriter or controlling person or persons, and the Borrower and such
         Underwriter or controlling  person or persons have been advised by such
         counsel that one or more legal  defenses may be available to it or them
         which may not be available to the Borrower,  in which case the Borrower
         shall  not  be   entitled   to  assume   the   defense   of  such  suit
         notwithstanding  its  obligation  to bear the fees and expenses of such
         counsel.

                  (14) In order to provide for just and  equitable  contribution
         in circumstances in which the indemnification provided for in Paragraph
         (13) hereof is applicable  but for any reason is held to be unavailable
         from the Borrower, the Borrower and the Underwriter shall contribute to
         the aggregate losses,  claims,  damages and liabilities  (including any
         investigation,  legal and other expenses  incurred in connection  with,
         and any amount paid in settlement of, any action, suit or proceeding or
         any claims asserted,  but after deducting any contribution  received by
         the Borrower  from persons who control the Borrower  within the meaning
         of Section 20 of the Securities  Exchange Act of 1934 and Section 15 of
         the Securities Act of 1933, as amended  (collectively,  the "Securities
         Acts"),  to which the  Borrower and the  Underwriter  may be subject in
         such  proportions that the Underwriter are responsible for that portion
         represented by the  percentage  that the  underwriting  discount or fee
         received by the  Underwriter  bears to the offering  price of the Bonds
         and the Borrower is  responsible  for the balance;  provided,  however,
         that (i) in no case shall the Underwriter be responsible for any amount
         in excess of the


                                       A-5

<PAGE>



         underwriting fee or discount  applicable to the Bonds purchased by such
         Underwriter pursuant to the Purchase Contract and (ii) no person guilty
         of fraudulent misrepresentation (within the meaning of Section 11(f) of
         the   Securities  Act  of  1933,  as  amended)  shall  be  entitled  to
         contribution  from any  person  who was not  guilty of such  fraudulent
         misrepresentation. For purposes of this Paragraph (14), each person, if
         any, who controls the Underwriter  within the meaning of the Securities
         Acts,  shall have the same rights to contribution  as the  Underwriter,
         and each person,  if any, who controls the Borrower  within the meaning
         of the Securities  Acts shall have the same rights to  contribution  as
         the  Borrower,  subject  in each case to  clauses  (i) and (ii) of this
         Paragraph (14). Any party entitled to contribution will, promptly after
         receipt of notice of  commencement  of any action,  suit or  proceeding
         against such party in respect of which a claim for  contribution may be
         made against another party or parties under this Paragraph (14), notify
         such party or parties  from whom  contribution  may be sought,  but the
         omission to so notify such party from whom  contribution  may be sought
         shall not relieve the party or parties  from whom  contribution  may be
         sought  from any  other  obligation  it or they may have  hereunder  or
         otherwise than under this Paragraph  (14). No party shall be liable for
         contribution  with respect to any action or claims settled  without its
         consent.

         The  representations,  warranties,  agreements and  indemnities  herein
shall survive the Closing under the Purchase Contract and any investigation made
by or on behalf of the Authority and the  Underwriter or any person who controls
the Authority or the  Underwriter of any matters  described in or related to the
transactions  contemplated  hereby and by the  Purchase  Contract,  the Official
Statement, the Loan Agreement, the Remarketing Agreement and the Indenture.




                                       A-6

<PAGE>



         This Letter of  Representation  shall be binding  upon the Borrower and
shall inure solely to the benefit of the Authority,  the Underwriter and, to the
extent set forth herein,  persons controlling the Authority and the Underwriter,
and their  respective  officers,  employees,  agents,  advisors,  attorneys  and
personal  representatives,  successors and assigns,  and no other person or firm
shall  acquire  or  have  any  right  under  or by  virtue  of  this  Letter  of
Representation.

                                Very truly yours,

                                ADVANCED AERODYNAMICS AND
                                STRUCTURES, INC.


                                By:________________________________
                                     Authorized Signatory



                                       A-7

<PAGE>










                                PURCHASE CONTRACT


                                      among


                         CALIFORNIA ECONOMIC DEVELOPMENT
                               FINANCING AUTHORITY


                      TREASURER OF THE STATE OF CALIFORNIA


                                       and


                          RAUSCHER PIERCE REFSNES, INC.




                              Dated August 4, 1997



                                   Relating to


                                   $8,500,000
               California Economic Development Financing Authority
                              Variable Rate Demand
                Industrial Development Revenue Bonds, Series 1997
              (Advanced Aerodynamics and Structures, Inc. Project)




                              REMARKETING AGREEMENT



     THIS  REMARKETING  AGREEMENT  (this  "Remarketing  Agreement"),  dated  and
effective  as of  August 1,  1997,  by and  between  ADVANCED  AERODYNAMICS  AND
STRUCTURES,  INC., a Delaware  corporation  (the "Borrower") and RAUSCHER PIERCE
REFSNES, INC. (the "Remarketing Agent").

                              W I T N E S S E T H:

     WHEREAS,  the  California  Economic  Development  Financing  Authority (the
"Issuer") has issued its Variable  Rate Demand  Industrial  Development  Revenue
Bonds, Series 1997 (Advanced  Aerodynamics and Structures,  Inc. Project) in the
aggregate principal amount of $8,500,000 (the "Bonds"), pursuant to that certain
Indenture of Trust, dated as of August 1, 1997 (the "Indenture"), by and between
the Issuer and First Trust of California,  National Association, as trustee (the
"Trustee"); and

     WHEREAS,  to secure  the  payment  of the  principal  of,  interest  on and
purchase price of the Bonds, The Sumitomo Bank, Limited,  acting through its Los
Angeles  Branch (the "Bank"),  has issued its  irrevocable  direct pay letter of
credit (the "Letter of Credit") to the Trustee; and

     WHEREAS,  the Bonds are subject to purchase upon notice and delivery to the
Tender  Agent (as such term is  defined in the  Indenture)  as  provided  in the
Indenture; and

     WHEREAS,  the  Remarketing  Agent has been appointed  (and the  Remarketing
Agent by execution hereby accepts the appointment) as Remarketing Agent pursuant
to the Indenture; and

     WHEREAS,  the Borrower and the Remarketing  Agent desire to make additional
provisions  regarding the Remarketing  Agent's role as Remarketing Agent for the
Bonds.

     NOW, THEREFORE,  for and in consideration of the covenants herein made, the
Borrower and the Remarketing Agent hereby agree as follows:

     Section 1.  Definitions.  All  capitalized  terms used in this  Remarketing
Agreement  which  are not  otherwise  defined  herein  shall  have the  meanings
ascribed to them in the Indenture.

     Section 2. Duties. (a) In reliance upon the representations and agreements,
but subject to the terms and  conditions  contained in the Indenture and in this
Remarketing  Agreement,  the  Remarketing  Agent  has  been  appointed,  and the
Remarketing  Agent hereby  accepts such  appointment,  as exclusive  remarketing
agent in connection with the offering and sale of the Bonds from time to time in
the secondary market  subsequent to the initial  offering,  issuance and sale of
the Bonds.



<PAGE>




     (b)  It  is   understood   and   agreed   that  the   Remarketing   Agent's
responsibilities  hereunder and under the Indenture  will include (i) exercising
its best efforts in its sale of the Bonds (ii)  effecting  and  processing  such
purchases,  (iii) billing and receiving payment of Bond purchases,  (iv) causing
the  proceeds  from the  secondary  sale of the Bonds to be  transferred  to the
Tender Agent,  (v)  determining  the Fixed Interest Rate and the Weekly Interest
Rates,  and (vi) performing such other related  functions as may be provided for
in the  Indenture  of the  Remarketing  Agent  or  reasonably  requested  by the
Borrower and agreed to by the Remarketing Agent.

     (c) The  obligations  of the  Remarketing  Agent  hereunder  and  under the
Indenture,  with  respect  to the date on which the  Bonds are to be  remarketed
pursuant  to  this  Remarketing  Agreement,  are  also  subject  to the  further
condition that on and prior to such date there shall not have been any change in
the ownership of the Project  except as permitted  pursuant to the Agreement and
the Indenture, the Indenture, the Agreement and the Letter of Credit shall be in
full force and effect and shall not have been amended,  modified or supplemented
in any way  which  would  materially  and  adversely  affect  the  duties of the
Remarketing  Agent,  except  as  may  have  been  agreed  to in  writing  by the
Remarketing  Agent,  and there shall be in full force and effect such additional
resolutions,  agreements,  certificates  (including such  certificates as may be
required by regulations  for the Internal  Revenue Service in order to establish
or preserve the  tax-exempt  character  of interest on the Bonds) and  opinions,
which  resolutions,  agreements,  certificates  and opinions shall be reasonably
satisfactory  in form and substance to the Trustee,  to the Issuer,  to the Bank
and to counsel for the Remarketing Agent.

     The  Remarketing  Agent will perform the duties  specified  as  Remarketing
Agent  under  the  Indenture  and  this  Remarketing  Agreement.  In  acting  as
Remarketing  Agent, the Remarketing Agent will act as agent and not as principal
except as expressly provided in this Section.

     The  Remarketing  Agent  may,  if  it  determines  to do  so  in  its  sole
discretion,  buy as  principal  any such  Bonds  but it will not in any event be
obligated to do so.

     Section 3. Disclosure  Statement.  (a) If the Remarketing  Agent reasonably
determines that it is necessary or desirable to amend or supplement the Official
Statement (as defined below) in connection  with its offering of the Bonds,  the
Remarketing  Agent will notify the Borrower and the Borrower  will  provide,  or
cause to be provided to, the Remarketing Agent an amendment or supplement to the
Official  Statement  satisfactory to the Remarketing  Agent and its counsel with
respect to the Bonds. The Borrower will supply,  or cause to be supplied to, the
Remarketing  Agent with such number of copies of the  amendment or supplement to
the Official  Statement and documents  related thereto as the Remarketing  Agent
reasonably  requests from time to time and will amend or supplement the Official
Statement (and/or the documents  incorporated by reference in it) so that at all
times the Official  Statement and any documents related thereto will not contain
any  untrue  statement  of a  material  fact or omit to  state a  material  fact
necessary  to  make  the  statements  in such  documents,  in the  light  of the
circumstances  under which they were made,  not  misleading.  In  addition,  the
Borrower will take all steps reasonably


                                        2

<PAGE>



requested by the Remarketing  Agent which the  Remarketing  Agent or its counsel
may  consider  necessary  or  desirable to register the sale of the Bonds by the
Remarketing  Agent under any Federal or state  securities  law or to qualify the
Indenture  under the Trust  Indenture  Act of 1939,  as  amended  and as then in
effect (the "Trust  Indenture  Act") to the extent required under any federal or
state  securities  law or the  Trust  Indenture  Act for  municipal  obligations
similar in character to the Bonds,  and will provide the Remarketing  Agent such
officers'  certificates,   counsel  opinions,  accountants'  letters  and  other
documents as may be customary in similar transactions.  If the Borrower does not
perform  its  obligations   under  this  Section,   the  Remarketing  Agent  may
immediately  cease to remarket  the Bonds and, in such  event,  shall  resign as
Remarketing Agent as provided herein.

     (b) The Issuer has  previously  prepared and  delivered to the  Remarketing
Agent a copy of the  Official  Statement,  dated  August 4, 1997 (the  "Official
Statement"), including financial and other information in respect of the Issuer,
the Borrower and the Bank. The Issuer has authorized the use by the  Remarketing
Agent of the Official Statement in connection with the remarketing of Bonds. For
purposes of this  Remarketing  Agreement,  the Official  Statement and any other
documents  provided to the  Remarketing  Agent pursuant to paragraph (a) of this
Section  shall be  considered  to be the  Disclosure  Statement  (as  defined in
Section 7 hereof).

     Section 4.  Representations,  Warranties,  Covenants and  Agreements of the
Remarketing Agent. The Remarketing Agent, by its acceptance hereof,  represents,
warrants, covenants and agrees with the Borrower as follows:

     (a) It is a member  of the  National  Association  of  Securities  Dealers,
having  a  capitalization   of  at  least   $15,000,000,   otherwise  meets  the
requirements for the Remarketing Agent set forth in the Indenture, is authorized
by  law to  perform  all  duties  imposed  upon  it by the  Indenture  and  this
Remarketing  Agreement  and has full  power and  authority  to take all  actions
required or permitted to be taken by the  Remarketing  Agent hereunder and under
the Indenture.

     (b) The  execution  and  delivery  of this  Remarketing  Agreement  and the
consummation of the transactions  contemplated  herein and in the Indenture will
not conflict with or constitute on the part of the Remarketing Agent a breach of
or default under its charter documents, its by-laws, or any statute,  indenture,
mortgage,  deed of trust, lease, note agreement or other agreement or instrument
to which the  Remarketing  Agent is a party or by which it or its properties are
bound, or any order,  rule or regulation of any court or governmental  agency or
body having  jurisdiction over the Remarketing Agent or any of its activities or
properties.

     (c) This  Remarketing  Agreement  has been duly  authorized,  executed  and
delivered by the Remarketing Agent and this Remarketing Agreement is a valid and
binding  obligation of the Remarketing  Agent enforceable in accordance with its
terms.



                                        3

<PAGE>



     (d) The  Remarketing  Agent will use its best efforts to remarket the Bonds
pursuant to this Remarketing Agreement and the Indenture.

     Section 5.  Representation,  Warranties,  Covenants  and  Agreements of the
Borrower.  The  representations,  warranties  and agreements of the Borrower set
forth in the Letter of  Representation,  dated August 4, 1997, from the Borrower
to Rauscher  Pierce Refsnes,  Inc., as the underwriter of the Bonds,  the Issuer
and the Treasurer of the State of California  attached to the Purchase  Contract
are hereby  incorporated herein as being made to the Remarketing Agent as of the
date hereof.

     Section 6. Conditions to Remarketing Agent's  Obligations.  The obligations
of the Remarketing  Agent under this Remarketing  Agreement have been undertaken
in reliance on, and shall be subject to, the due  performance by the Borrower of
its obligations and agreements to be performed  hereunder and to the accuracy of
and compliance with the representations, warranties, covenants and agreements of
the  Borrower  contained  herein,  on and as of the  date  of  delivery  of this
Remarketing  Agreement.  The obligations of the  Remarketing  Agent on and as of
each date on which Bonds are to be offered and sold pursuant to this Remarketing
Agreement are also subject to the following further conditions:

     (a) Each of the  Indenture,  the  Agreement,  the  Letter  of  Credit,  the
Reimbursement Agreement and all other documents and agreements referenced in the
Indenture  or  relating to the Bonds shall be in full force and effect and shall
not  have  been  amended,  modified  or  supplemented  in any  way  which  would
materially and adversely affect the Bonds,  except as may have been agreed to in
writing by the  Remarketing  Agent,  and there shall be in full force and effect
such  additional  resolutions,  agreements,  certificates  and  opinions,  which
resolutions, agreements, certificates and opinions shall be satisfactory in form
and substance to the Remarketing Agent; and

     (b) No Event of Default shall have occurred and be continuing  and no event
shall have  occurred and be  continuing  which,  with the passage of time or the
giving of notice or both, would constitute such an Event of Default.

     Section 7. Indemnification and Contribution. (a) To the extent permitted by
law, the Borrower will indemnify and hold harmless the Remarketing  Agent,  each
of its  directors,  officers  and  employees  and each person who  controls  the
Remarketing  Agent  within the  meaning of Section 15 of the  Securities  Act of
1933, as amended (herein called the  "Securities  Act" and any such person being
herein  sometimes  called an "Indemnified  Party"),  against any and all losses,
claims,  damages or  liabilities,  joint or several,  to which such  Indemnified
Party may become  subject under any statute or at law or in equity or otherwise,
and shall reimburse any such  Indemnified  Party for any legal or other expenses
incurred  by it in  connection  with  investigating  any  claims  against it and
defending any actions, but only to the extent that such losses, claims, damages,
liabilities  or  actions  arise out of or are based  upon (i) an  allegation  or
determination  that the Bonds or the obligations of the Bank under the Letter of
Credit should have been  registered  under the  Securities  Act or the Indenture
should have been  qualified  under the Trust  Indenture  Act, or (ii) any untrue
statement or alleged untrue statement of a material fact


                                        4

<PAGE>



contained in any amendment or supplement to the Official  Statement  referred to
in  Section 3 hereof (a  "Disclosure  Statement")  or any  amendment  thereof or
supplement  thereto,  or the  omission or alleged  omission  to state  therein a
material fact necessary to make the statements  therein not misleading,  but the
Borrower  shall not be liable in any such case to the extent that any such loss,
claim,  damage,  liability or action  arises out of, or is based upon,  any such
untrue  statement or alleged  untrue  statement or omission or alleged  omission
made  therein  in  reliance  upon and in  conformity  with  written  information
furnished to the Borrower or the Issuer by the  Remarketing  Agent  specifically
for use in connection with the preparation  thereof,  or if the person asserting
any such loss, claim,  damage or liability  purchased Bonds from the Remarketing
Agent,  if delivery to such person of the Disclosure  Statement or any amendment
or  supplement  to it would have been a valid  defense to the action  from which
such loss, claim, damage or liability arose and if the same was not delivered to
such person by or on behalf of the Remarketing  Agent. This indemnity  agreement
shall not be construed as a limitation on any other liability which the Borrower
may otherwise have to any Indemnified  Party. The Remarketing  Agent may, in its
sole discretion,  pursue any rights it may have against any party other than the
Borrower to recover any losses,  damages or liabilities  covered by this Section
7(a); provided,  however,  that the Borrower's liability under this Section 7(a)
shall not be  limited  by the  availability  of such  rights or the  Remarketing
Agent's actions with respect to such rights.

     (b) An Indemnified Party shall, promptly after the receipt of notice of the
commencement  of any action against such  Indemnified  Party in respect of which
indemnification  may be sought against the Borrower (the "Indemnifying  Party"),
notify the Indemnifying  Party in writing of the commencement  thereof.  In case
any  such  action  shall  be  brought  against  an  Indemnified  Party  and such
Indemnified  Party shall notify the Indemnifying  Party, the Indemnifying  Party
may, or if so requested by such Indemnified Party shall,  participate therein or
assume  the  defense  thereof,  with  counsel  reasonably  satisfactory  to such
Indemnified  Party,  and  after  notice  from  the  Indemnifying  Party  to such
Indemnified  Party of an  election  so as to assume the  defense  thereof,  such
Indemnified Party shall reasonably  cooperate in the defense thereof,  including
without  limitation,  the settlement of outstanding claims, and the Indemnifying
Party will not be liable to such Indemnified  Party under this Section 7 for any
legal or other  expenses  subsequently  incurred  by such  Indemnified  Party in
connection with the defense thereof other than reasonable costs of investigation
incurred with the consent of the Indemnifying  Party, which consent shall not be
unreasonably withheld; provided, however, that unless and until the Indemnifying
Party assumes the defense of any such action at the request of such  Indemnified
Party,  the  Indemnifying  Party shall have the right to  participate at its own
expense in the defense of any such action.  If the Indemnifying  Party shall not
have employed counsel to have charge of the defense of any such action or if any
Indemnified  Party shall have  reasonably  concluded  that there may be defenses
available  to it or them  which  are  different  from  or  additional  to  those
available to the Indemnifying  Party (in which case the Indemnifying Party shall
not have the  right to  direct  the  defense  of such  action  on behalf of such
Indemnified Party),  legal and other expenses incurred by such Indemnified Party
shall be borne by the  Indemnifying  Party. Any obligation under this Section of
an Indemnifying Party to reimburse an Indemnified Party for


                                        5

<PAGE>



expenses  includes the obligation to make advances to the  Indemnified  Party to
cover such expenses in reasonable  amounts and at reasonable  periodic intervals
not  more  often  than   monthly  as  requested   by  the   Indemnified   Party.
Notwithstanding  the foregoing,  the Indemnifying  Party shall not be liable for
any  settlement  of any action or claim  effected  without  its  consent,  which
consent shall not be unreasonably withheld.

     (c)  In  order  to  provide  for  just  and   equitable   contribution   in
circumstances in which the indemnification provided for in paragraph (a) of this
Section 7 is due in  accordance  with its terms but is for any reason  held by a
court to be  unavailable  from the  Borrower  on  grounds  of  public  policy or
otherwise,  the  Borrower  and the  Remarketing  Agent shall  contribute  to the
aggregate  losses,  claims,  damages and liabilities  (including  legal or other
expenses reasonably incurred in connection with investigating or defending same)
to which the  Borrower  and the  Remarketing  Agent may be  subject  (i) in such
proportion as is  appropriate to reflect the relative  benefits  received by the
Borrower  on the one  hand  and the  Remarketing  Agent  on the  other  from the
remarketing of the Bonds or (ii) if the allocation  provided by clause (i) above
is not permitted by applicable  law, in such  proportion  as is  appropriate  to
reflect not only the relative  benefits referred to in clause (i) above but also
the relative fault of the Borrower and the Remarketing  Agent in connection with
the failure to register or qualify  certain  instruments as described in Section
7(a)(i) or in connection with the statements or omissions which resulted in such
losses,  claims,  damages  or  liabilities,   as  well  as  any  other  relevant
considerations.  The relative  benefits received by the Borrower on the one hand
and the  Remarketing  Agent  on the  other  shall  be  deemed  to be in the same
proportion as the aggregate principal amount of the Bonds remarketed pursuant to
this  Remarketing  Agreement bear to the total  remarketing fees received by the
Remarketing Agent. The relative fault of the Borrower on the one hand and of the
Remarketing  Agent on the other shall be determined by reference to, among other
things, whether the untrue or alleged untrue statement of a material fact or the
omission or alleged  omission to state a material  fact  relates to  information
supplied by the Borrower or by the Remarketing  Agent and the parties'  relative
intent,  knowledge,  access to information and opportunity to correct or prevent
such statement or omission;  provided,  however, in the case of an allegation or
determination  that the Bonds or the obligations of the Bank under the Letter of
Credit should have been  registered  under the  Securities  Act or the Indenture
should have been  qualified  under the Trust  Indenture  Act, the fault shall be
deemed to be  entirely  that of the  Borrower.  The amount  paid or payable by a
party as a result of the losses,  claims,  damages and  liabilities  referred to
above shall be deemed to include any legal or other fees or expenses  reasonably
incurred by such party in connection with  investigating or defending any action
or claim.

     (d) The Borrower and the Remarketing  Agent agree that it would not be just
and equitable if contribution  pursuant to this Section 7 were determined by pro
rata allocation or by any other method of allocation which does not take account
of  the  equitable  considerations  referred  to in  the  immediately  preceding
paragraph.  Notwithstanding  the  provisions of this Section 7, the  Remarketing
Agent  shall  not  be  required  to  contribute  any  amount  in  excess  of the
remarketing fee applicable to the Bonds remarketed  pursuant to this Remarketing
Agreement. No person guilty of


                                        6

<PAGE>



fraudulent  misrepresentation  (within  the  meaning  of  Section  11(f)  of the
Securities  Act) shall be  entitled to  contribution  from any person who is not
guilty of such fraudulent misrepresentation.


     (e)  For  purposes  of  this  Section  7,  each  person  who  controls  the
Remarketing  Agent within the meaning of Section 15 of the  Securities Act shall
have  the  same  rights  as  the  Remarketing   Agent.  Any  party  entitled  to
contribution  shall,  promptly  after receipt of notice of  commencement  of any
action,  suit or  proceeding  against such party in respect of which a claim for
contribution  may be made against  another party or parties under paragraph (d),
notify  such  party or parties  from whom  contribution  may be sought,  but the
omission  so to notify  such party or  parties  shall not  relieve  the party or
parties from whom  contribution  may be sought from any other  obligation  it or
they may have hereunder or otherwise than under paragraph (d).

     Section 8. Fees and Expenses.  In consideration of the Remarketing  Agent's
services under this Remarketing Agreement, the Borrower will pay the Remarketing
Agent an annual  amount equal to an  aggregate  of 1/8 of 1.0% of the  aggregate
principal amount of Bonds outstanding under the Indenture,  payable quarterly in
arrears on February 1, May 1, August 1 and November 1, commencing on November 1,
1997 and computed on the basis of the actual number of days elapsed  during such
calculation  period and the aggregate  principal amount of the Bonds outstanding
during such  calculation  period.  The  Borrower  also will pay all  expenses in
connection with the preparation of any Disclosure Statement, the registration of
the Bonds and any other documents  relating to the Bonds required to comply with
any applicable  securities  laws or required to comply with the Trust  Indenture
Act and will reimburse the  Remarketing  Agent for all of its reasonable  direct
out-of-pocket   expenses   incurred  by  it  as  Remarketing  Agent  under  this
Remarketing   Agreement   and  the   Indenture,   including   counsel  fees  and
disbursements.

     Section  9.  Dealing  in Bonds by  Paying  Agent,  Tender  Agent,  Bank and
Remarketing Agent. The Trustee,  the Paying Agent, the Tender Agent, the Bank or
the Remarketing Agent, in their respective  individual  capacities,  may in good
faith buy,  sell,  own,  hold and deal in any of the Bonds,  and may join in any
action  which Bond  owners may be entitled to take with like effect as if it did
not act in any capacity  hereunder.  The Trustee,  the Paying Agent,  the Tender
Agent,  the  Bank or the  Remarketing  Agent,  in  their  respective  individual
capacities, either as principal or agent, may also engage in or be interested in
any financial or other  transaction with the Issuer,  and may act as depositary,
trustee or agent for other  obligations of the Issuer as freely as if it did not
act in any capacity hereunder.

     Section 10. Intention of Parties. It is the intention of the parties hereto
that no purchase,  sale or transfer of any Bonds, as herein and in the Indenture
provided,  shall constitute or be construed to be extinguishment of any Bonds or
the indebtedness represented thereby or the reissuance of any Bonds.

     Section 11. Fails. The Remarketing  Agent will not be liable to the Issuer,
the  Borrower,  the  Trustee,  the  Tender  Agent or the Bank on  account of the
failure of any person to whom the  Remarketing  Agent has sold a Bond to pay for
such Bond or to deliver any


                                        7

<PAGE>



document  in  respect  of  the  sale.  It is  understood  and  agreed  that  the
Remarketing  Agent shall not be  obligated to advance its own funds to purchase,
or to effect the purchase of, any Bonds.

     Section 12. Remarketing Agent's Performance. (a) The duties and obligations
of the Remarketing  Agent as Remarketing Agent shall be determined solely by the
express  provisions of this  Remarketing  Agreement and the  Indenture,  and the
Remarketing Agent shall not be responsible for the performance of any duties and
obligations  other  than as are  specifically  set  forth  in  this  Remarketing
Agreement and the Indenture,  and no implied  covenants or obligations  shall be
read into this  Remarketing  Agreement or the Indenture  against the Remarketing
Agent.

     (b) The Remarketing Agent may conclusively rely upon any notice or document
given or furnished to the Remarketing  Agent and conforming to the  requirements
of this Remarketing  Agreement or the Indenture and shall be protected in acting
upon any such notice or document  reasonably believed by it to be genuine and to
have been given, signed or presented by the proper party or parties.

     (c) The  Remarketing  Agent  shall not be liable for any  actions  taken or
omitted to be taken pursuant to this Remarketing  Agreement,  except for its own
negligence or willful misconduct.

     Section 13.  Termination.  (a) This  Remarketing  Agreement  will terminate
automatically  at such  time as all of the Bonds  have been paid or deemed  paid
under  the  Indenture  and upon the  effective  resignation  or  removal  of the
Remarketing  Agent as Remarketing  Agent in accordance  with the Indenture.  The
Remarketing  Agent  will  resign as  Remarketing  Agent  under  the  Remarketing
Agreement  if  requested  to do so by the Borrower and the Issuer in writing and
may resign at any time upon forty-five (45) days written notice delivered to the
Issuer, the Borrower, the Tender Agent, the Bank, the Trustee, Standard & Poor's
Ratings Services and Moody's Investors  Service,  to the extent each such rating
agency is then rating the Bonds.

     (b) In addition to the  provisions of paragraph  (a) of this  section,  the
Remarketing Agent may terminate its obligations under this Remarketing Agreement
at any time by notifying the Borrower in writing or by telegram,  telex or other
electronic communications of its election so to do, if:

          (i) Legislation shall be favorably reported,  recommended by committee
or enacted by the Congress or adopted by either House thereof or a decision by a
Court of the United  States of America or the United  States Tax Court  shall be
rendered,  or a ruling,  regulation or official statement by or on behalf of the
Treasury  Department  of the United  States of  America,  the  Internal  Revenue
Service or other  governmental  agency  shall be made,  with  respect to federal
taxation of receipts, revenues or other income of the general character expected
to be derived  by the Issuer or of  interest  received  on bonds of the  general
character  of the Bonds or which would have the effect of  changing  directly or
indirectly  the  federal  income tax  consequences  of  interest on bonds of the
general


                                        8

<PAGE>



character  of the  Bonds in the  hands of the  holders  thereof,  which,  in the
opinion of the Remarketing Agent,  materially adversely affects the market price
of the Bonds;

          (ii)  Legislation  shall be introduced  by committee,  by amendment or
otherwise,  in, or be enacted by, the House of  Representatives or the Senate of
the Congress of the United States, or a decision by a court of the United States
shall be rendered, or a stop order, ruling, regulation or official statement by,
or on behalf of, the United States  Securities and Exchange  Commission or other
governmental  agency having  jurisdiction of the subject matter shall be made or
proposed,  to the effect that the offering or sale of obligations of the general
character of the Bonds, as contemplated  hereby,  is or would be in violation of
any provision of the Securities Act, or the Securities  Exchange Act of 1934, as
amended and as then in effect,  or the Trust  Indenture Act, or with the purpose
or effect of otherwise  prohibiting  the offering or sale of  obligations of the
general character of the Bonds, or the Bonds, as contemplated hereby;

          (iii)  Any  information  shall  have  become  known,   which,  in  the
Remarketing Agent's reasonable opinion, makes untrue, incorrect or misleading in
any material  respect any statement or  information  contained in the Disclosure
Statement, as the information contained therein has been supplemented or amended
by  other  information,  as  of  the  date  furnished  or  supplemented  to  the
Remarketing  Agent in accordance with Section 3 hereof, or causes the Disclosure
Statement,  as so  supplemented or amended,  to contain an untrue,  incorrect or
misleading  statement  of a material  fact or to omit to state a  material  fact
required to be stated therein or necessary to make the statements  made therein,
in light of the circumstances under which they were made, not misleading;

          (iv)  Except  as  provided  in clause  (i)  hereof,  any  legislation,
resolution,  ordinance, rule or regulation shall be introduced in, or be enacted
by, any  governmental  body,  department  or agency of the United  States or the
State  of  California  shall  be  rendered  which,  in the  Remarketing  Agent's
reasonable opinion, materially adversely affects the marketability of the Bonds;

          (v)  Additional  material  restrictions  not in  force  as of the date
hereof  shall have been  imposed  upon  trading in  securities  generally by any
governmental authority or by any national securities exchange;

          (vi) Any  governmental  authority  shall impose,  as to the Bonds,  or
obligations of the general character of the Bonds, any material restrictions not
now in force, or increase materially those now in force;

          (vii) A general  banking  moratorium  shall have been  established  by
federal, New York or California authorities;



                                        9

<PAGE>



          (viii) Any rating of the Bonds shall have been downgraded or withdrawn
by a national rating  service,  which,  in the  Remarketing  Agent's  reasonable
opinion, materially adversely affects the marketability of the Bonds;

          (ix) A war involving the United  States shall have been  declared,  or
any existing conflict involving the armed forces of the United States shall have
escalated,  or any other national emergency relating to the effective  operation
of government or the financial  community  shall have  occurred,  which,  in the
Remarketing  Agent's  reasonable  opinion,   materially  adversely  affects  the
marketability of the Bonds;

          (x) An event, including, without limitation, the bankruptcy or default
of any other issuer of or obligor on obligations of the general character of the
Bonds or on similar  commercial paper, shall have occurred which, in the opinion
of the Remarketing  Agent, makes the marketability of obligations of the general
character of the Bonds impossible over an extended period of time.

The provisions of Section 7 shall survive the  termination  of this  Remarketing
Agreement and the payment or defeasance of the Bonds.

     Section 14. Miscellaneous.  (a) Except as otherwise provided, any notice or
other  communication  herein  required  or  permitted  to be  given  shall be in
writing,  by facsimile  transmission  or by telephone  with  subsequent  written
confirmation  and may be personally  served or sent by United States mail, first
class mail postage prepaid,  and shall be deemed to have been given upon receipt
by the party  notified.  For the  purposes  hereof,  the  address of the parties
(until notice of a change thereof is delivered as provided in this Section 14(a)
shall be as follows:


     Remarketing Agent:       Rauscher Pierce Refsnes, Inc.
                              2711 North Haskell Avenue, Suite 2400
                              Dallas, Texas  75204
                              Attention:  Fixed Income Banking
                              (214) 989-1834   Fax: (214) 989-1842

     Issuer:                  California Economic Development
                              Financing Authority
                              801 K Street, Suite 1700
                              Sacramento, California  91584
                              Attention:  Chair
                              (916) 323-8022   Fax:  (916) 322-7214




                                       10

<PAGE>



     Bank:                    The Sumitomo Bank, Limited
                              777 South Figueroa Street, Suite 2600
                              Los Angeles, California  90017
                              Attention: Structured Finance & Financial
                              Institutions Group
                              (213) 955-0800  Fax:  (213) 623-6832

     Borrower:                Advanced Aerodynamics and Structures, Inc.
                              3501 Lakewood Boulevard
                              Long Beach, California 90808
                              Attention: President
                              (562) 938-8618  Fax: (562) 938-8620

     Trustee:                 First Trust of California, National Association
                              One California Street, 4th Floor
                              San Francisco, California  94111
                              Attention: Municipal Trusts and Agency
                              (415) 273-4500     Fax: (415) 273-4590

     Tender Agent:            First Trust of California, National Association
                              One California Street, 4th Floor
                              San Francisco, California  94111
                              Attention: Municipal Trusts and Agency
                              (415) 273-4590     Fax: (415) 273-4590

     The Remarketing Agent, the Issuer, the Borrower,  the Trustee, the Bank and
the  Tender  Agent  may,  by notice  given  under  this  Remarketing  Agreement,
designate  other  addresses to which  notices or other  communications  shall be
directed.

     (b) This Remarketing  Agreement will inure to the benefit of and be binding
upon the parties hereto and their respective  successors and assigns.  The terms
"successors"  and "assigns"  shall not include any purchaser of any of the Bonds
merely because of such purchase.

     (c)  All of the  representations,  warranties  and  covenants  made in this
Remarketing  Agreement  shall  remain  operative  and in full force and  effect,
regardless  of (i) any  investigation  made by or on behalf of any party hereto,
(ii) delivery of and any payment for any Bonds hereunder,  or (iii)  termination
or cancellation of this Remarketing Agreement.

     (d) Section headings have been inserted in this Remarketing  Agreement as a
matter of  convenience  of  reference  only,  and it is agreed that such section
headings are not a part of this  Remarketing  Agreement  and will not be used in
the interpretation of any provisions of this Remarketing Agreement.



                                       11

<PAGE>



     (e) If any provision of this Remarketing  Agreement shall be held or deemed
to be or shall, in fact, be invalid,  inoperative or unenforceable as applied in
any  particular  case  in  any   jurisdiction  or   jurisdictions,   or  in  all
jurisdictions  because it conflicts  with any  provisions  of any  constitution,
statute,  rule or public policy, or any other reason,  such circumstances  shall
not have the effect of rendering the provisions in question invalid, inoperative
or unenforceable  in any other case or  circumstance,  or of rendering any other
provisions of this Remarketing  Agreement invalid,  inoperative or unenforceable
to any extent whatsoever.

     (f) This  Remarketing  Agreement  may be executed in several  counterparts,
each of which shall be regarded as an original and all of which shall constitute
one and the same document.

     (g) The terms of this Remarketing  Agreement shall not be waived,  altered,
modified,  amended or  supplemented in any manner  whatsoever  except by written
instrument signed by all of the parties hereto.

     (h) This  Remarketing  Agreement  shall be  governed  by and  construed  in
accordance with the laws of the State of California.





                                       12

<PAGE>



     IN WITNESS WHEREOF, the Remarketing Agent and the Borrower have caused this
Remarketing  Agreement to be signed in their names by the undersigned  officers,
thereunto duly authorized, all as of the day and year first above written.



                                            RAUSCHER PIERCE REFSNES, INC.


                                            By ________________________________
                                                Managing Director



                                            ADVANCED AERODYNAMICS AND
                                            STRUCTURES, INC.


                                            By ________________________________
                                                Authorized Signatory




<PAGE>










                              REMARKETING AGREEMENT


                                 by and between



                          RAUSCHER PIERCE REFSNES, INC.


                                       and


                   ADVANCED AERODYNAMICS AND STRUCTURES, INC.



                           Dated as of August 1, 1997





                                   Relating to


                                   $8,500,000
               California Economic Development Financing Authority
                              Variable Rate Demand
                Industrial Development Revenue Bonds, Series 1997
              (Advanced Aerodynamics and Structures, Inc. Project)




                    Blanket Issuer Letter of Representations
                           [To be Completed by Issuer]


               California Economic Development Financing Authority
                                [Name of Issuer]


                                                                 April 11, 1996
                                                                     [Date]


Attention:  Underwriting Department - Eligibility
The Depository Trust Company
55 Water Street, 50th Floor
New York, NY 10041-0099

Ladies and Gentlemen:

         This letter  sets forth our  understanding  with  respect to all issues
(the  "Securities")  that Issuer shall request be made eligible for deposit,  by
The Depository Trust Company ("DTC").

         To induce DTC to accept the  Securities as eligible for deposit at DTC,
and to act in accordance with DTC's Rules with respect to the Securities, Issuer
represents to DTC that Issuer will comply with the requirements  stated in DTC's
Operational Arrangements, as they may be amended from time to time.


Note:                                 Very truly yours,

Schedule A contains  statements       Califonria Economic Development Financing
that DTC believes  accurately         Authority
describe DTC, the method of           -----------------------------------------
effecting book-entry transfers                         Issuer
of securities  distributed 
through DTC, and certain related      By:______________________________________
matters.                                   (Authorized Officer's Signature)


Received and Accepted:

THE DEPOSITORY TRUST COMPANY          Loren Kaye, Chair
                                      -----------------------------------------
                                             (Typewrite Name & Title)
By:_____________________________      801 "K" Street, Suite 1700
                                      -----------------------------------------
                                                  (Street Address)    
                                      Sacramento, CA  95814
                                      -----------------------------------------
                                      (City)          (State)             (Zip)
                                      916-324-9775
                                      -----------------------------------------

<PAGE>



                                                                     SCHEDULE A

                        SAMPLE OFFERING DOCUMENT LANGUAGE
                       DESCRIBING BOOK-ENTRY-ONLY ISSUANCE

  (Prepared by DTC-bracketed material may be applicable only to certain issues)

          1. The  Depository  Trust Company  ("DTC"),  New York, NY, will act as
securities depository for the securities (the "Securities"). The Securities will
be issued as  fully-registered  securities  registered in the name of Cede & Co.
(DTC's partnership nominee).  One fully-registered  Security certificate will be
issued for [each issue of] the  Securities,  [each] in the  aggregate  principal
amount  of such  issue,  and will be  deposited  with  DTC.  [If,  however,  the
aggregate principal amount of [any] issue exceeds $200 million, one certificate,
will be issued with  respect to each $200 million of  principal  amount,  and an
additional  certificate  will be issued with respect to any remaining  principal
amount of such issue.]

         2. DTC is a limited-purpose  trust company organized under the New York
Banking Law, a "banking organization" within the meaning of the New York Banking
Law, a member of the Federal Reserve System, a "clearing corporation" within the
meaning  of the New  York  Uniform  Commercial  Code,  and a  "clearing  agency"
registered  pursuant to the provisions of Section 17A of the Securities Exchange
Act of 1934. DTC holds securities that its participants ("Participants") deposit
with DTC. DTC also facilitates the settlement  among  Participants of securities
transactions,  such as transfers and pledges,  in deposited  securities  through
electronic computerized  book-entry changes in Participants'  accounts,  thereby
eliminating the need for physical  movement of securities  certificates.  Direct
Participants  include  securities  brokers and dealers,  banks, trust companies,
clearing corporations, and certain other organizations. DTC is owned by a number
of its  Direct  Participants  and by the New  York  Stock  Exchange,  Inc.,  the
American  Stock  Exchange,  Inc.,  and the National  Association  of  Securities
Dealers,  Inc.  Access to the DTC  system is also  available  to others  such as
securities brokers and dealers, banks, and trust companies that clear through or
maintain a custodial relationship with a Direct Participant,  either directly or
indirectly  ("Indirect  Participants").  The  Rules  applicable  to DTC  and its
Participants are on file with the Securities and Exchange Commission.

         3.  Purchases  of  Securities  under the DTC system  must be made by or
through Direct  Participants,  which will receive a credit for the Securities on
DTC's records.  The ownership interest of each actual purchaser of each Security
("Beneficial  Owner")  is in turn to be  recorded  on the  Direct  and  Indirect
Participants'  records.  Beneficial Owners will not receive written confirmation
from DTC of their  purchase,  but  Beneficial  Owners  are  expected  to receive
written confirmations providing details of the transaction,  as well as periodic
statements of their holdings,  from the Direct or Indirect  Participant  through
which the Beneficial Owner entered into the transaction.  Transfers of ownership
interest in the Securities are to be  accomplished  by entries made on the books
of Participants  acting on behalf of Beneficial  Owners.  Beneficial Owners will
not receive  certificates  representing their ownership interests in Securities,
except in the event  that use of the  book-entry  system for the  Securities  is
discontinued.


                                        1

<PAGE>



         4. To facilitate  subsequent  transfers,  all  Securities  deposited by
Participants with DTC are registered in the name of DTC's  partnership  nominee,
Cede & Co. The deposit of Securities with DTC and their registration in the name
of Cede & Co. effect no change in beneficial ownership.  DTC has no knowledge of
the actual Beneficial  Owners of the Securities.  DTC's records reflect only the
identity  of the Direct  Participants  to whose  accounts  such  Securities  are
credited,  which may or may not be the Beneficial  Owners. The Participants will
remain  responsible  for  keeping  account of their  holdings on behalf of their
customers.

         5.  Conveyance  of notices  and other  communications  by DTC to Direct
Participants,  by Direct  Participants to Indirect  Participants,  and by Direct
Participants and Indirect  Participants to Beneficial Owners will be governed by
arrangements among them, subject to any statutory or regulatory  requirements as
may e in effect from time to time.

          [ 6.  Redemption  notices shall be sent to Cede & Co. If less than all
of the  Securities  within an issue are being  redeemed,  DTC's  practice  is to
determine by lot the amount of the interest of each Direct  Participant  in such
issue to be redeemed.]

         7.  Neither  DTC nor Cede & Co.  will  consent or vote with  respect to
Securities. Under its usual procedures, DTC mails an Omnibus Proxy to the Issuer
as soon as possible  after the record  date.  The Omnibus  Proxy  assigns Cede &
Co.'s consenting or voting rights to those Direct Participants to whose accounts
the Securities are credited on the record date (identified in a listing attached
to the Omnibus Proxy).

         8. Principal and interest  payments on the  Securities  will be made to
DTC. DTC's practice is to credit Direct  Participants'  accounts on payable date
in accordance with their  respective  holdings shown on DTC's records unless DTC
has reason to believe that it will not receive payment on payable date. Payments
by Participants to Beneficial  Owners will be governed by standing  instructions
and customary practices, as is the case with securities held for the accounts of
customers  in  bearer  form or  registered  in  "street  name,"  and will be the
responsibility  of such  Participant  and not of DTC, the Agent,  or the Issuer,
subject to any  statutory or  regulatory  requirements  as may be in effect from
time to time.  Payment of principal and interest to DTC is the responsibility of
the Issuer or the Agent,  disbursement  of such payments to Direct  Participants
shall be the  responsibility  of DTC, and  disbursement  of such payments to the
Beneficial   Owners  shall  be  the   responsibility   of  Direct  and  Indirect
Participants.

[ 9. A  Beneficial  Owner  shall  give  notice  to elect to have its  Securities
purchased  or tendered,  through its  Participant,  to the  [Tender/Remarketing]
Agent,  and shall  effect  delivery  of such  Securities  by causing  the Direct
Participant to transfer the Participant's  interest in the Securities,  on DTC's
records,  to  the  [Tender/Remarketing]  Agent.  The  requirement  for  physical
delivery of Securities  in connection  with a demand for purchase or a mandatory
purchase will be deemed  satisfied  when the ownership  rights in the Securities
are transferred by Direct Participants on DTC's records.]


                                        2

<PAGE>



         10. DTC may discontinue providing its services as securities depository
with respect to the  Securities at any time by giving  reasonable  notice to the
Issuer or the Agent.  Under such  circumstances,  in the event that a  successor
securities depository is not obtained,  Security certificates are required to be
printed and delivered.

         11.  The  issuer  may  decide  to  discontinue  use  of the  system  of
book-entry transfers through DTC (or a successor securities depository). In that
event, Security certificates will be printed and delivered.

         12. The information in this section concerning DTC and DTC's book-entry
system has been obtained  from sources that the Issuer  believes to be reliable,
bu the Issuer takes no responsibility for the accuracy thereof.



                                        3

<PAGE>



APPENDIX B - Variable Rate Demand Obligations (VRDOs)

This section is intended to advise issuers, agents and Participants (the parties
to the  Book-Entry-Only  (BEO  issue)  of  additional  operational  requirements
necessary to process VRDOs through the depository.

1.        In the event  that  certain  Securities  are not  subject to a partial
          redemption,  DTC will  exclude  such  Securities  from its  redemption
          procedures  if such  exclusion is  requested as follows.  Such request
          shall be in writing and shall contain (a)  certification by Trustee or
          Issuer that the principal  amount of such Securities is not subject to
          the  partial   redemption  and   certification   by  a   custodian/DTC
          Participant that the Participant's  position on DTC's records includes
          such Securities;  and (b)  certification by Trustee or Issuer that the
          election to exclude such  Securities  from the partial  redemption  is
          authorized  under the  Document.  Such request  shall be sent to DTC's
          Call  Notification  Department  in the  manner  indicated  on page 11,
          paragraph  4b, to assure that such request is in DTC's  possession  no
          later  than  the  close of  business  two  business  days  before  the
          Publication Date of the partial redemption notice.

2.        It is  understood  that  for  so  long  as  optional  tenders  of  the
          Securities may be made daily following  same-day or seven-day  notice,
          such  tenders  will be  effected  by  means  of  DTC's  Deliver  Order
          Procedures.  DTC shall have no  responsibility  to distribute  notices
          regarding such option tenders, or to ascertain whether any such tender
          has been made. Except as otherwise  provided herein, and in accordance
          with DTC's  procedures for exercise of voting and  consenting  rights,
          the parties hereto  acknowledge that so long as Cede & Co. is the sole
          record  owner of the  Securities  it shall be  entitled  to all voting
          rights  applicable to the Securities and to receive the full amount of
          all distributions payable with respect to the Securities.  The parties
          acknowledge  that DTC shall treat any DTC Participant  ("Participant")
          having Securities credited to its DTC accounts as entitled to the full
          benefits  of  ownership  of such  Securities  even if the  credits  of
          Securities  to the  DTC  accounts  of  such  Participant  result  from
          failures to deliver Securities or improper deliveries of Securities by
          an owner  of  Securities  subject  to  tender  for  purchase.  Without
          limiting  the  generality  of  the  preceding  sentence,  the  parties
          acknowledge  that DTC shall  treat  any  Participant  have  Securities
          credited to its DTC accounts as entitled to receive  distributions and
          voting  rights,  if any, with respect to the Securities and to receive
          certificates  evidencing  Securities  if such  certificates  are to be
          issued  in  accordance  with  paragraphs  4 & 5 of  Appendix  A.  (The
          treatment by DTC of the effects of the  crediting by it of  Securities
          to  the  accounts  of  Participant  described  in  the  preceding  two
          sentences  shall not affect the rights of the parties  hereto  against
          any Participant.)

3.        It is  understood  that  for  so  long  as  optional  tenders  of  the
          Securities may be made less frequently  than daily following  same-day
          or seven-day notice (e.g., during a monthly,  quarterly,  semi-annual,
          or annual  tender  period)  and Cede & Co.,  as nominee of DTC, or its
          registered assigns, as the record owner of Securities,  is entitled to
          tender the Securities, such tenders will be effected by means of DTC's
          Put Option Procedures. Under the Put Option

                                        4

<PAGE>



         Procedures,  DTC will  receive  during  the  applicable  tender  period
         instructions  from its Participants to tender  Securities for purchase.
         The parties  agree that such tenders for purchase may be made by DTC by
         means of a  book-entry  credit of such  Securities  to the  account  of
         Tender Agent,  provided that such credit is made on or before the final
         day of the applicable  tender period.  DTC agrees that,  promptly after
         the recording of any such book-entry  credit, it will provide to Tender
         Agent an Agent Put Daily  Activity  Report in  accordance  with the Put
         Option  Procedures,   identifying  the  Securities  and  the  aggregate
         principal  amount  thereof as to which such tenders for  purchase  have
         been made.

Trustee or Issuer shall send a notice to DTC regarding such optional  tenders of
Securities by hand or by a secure means (e.g.,  legible telecopy,  registered or
certified mail,  overnight  delivery) in a timely manner designed to ensure that
such  notice is in DTC's  possession  no later  than the close of  business  two
business days before the  Publication  Date. The  Publication  Date shall be not
less  than 15 days  prior to the start of the  applicable  tender  period.  Such
notice shall state whether any partial redemption of the Securities is scheduled
to occur during the applicable optional tender period.

If delivered by hand or sent by mail or overnight delivery, such notice shall be
sent to:

                  Supervisor, Put Bond Unit
                  Reorganization Department
                  The Depository Trust Company
                  7 Hanover Square, 23rd Floor
                  New York, NY 10004-2695

If sent by  telecopy,  such  notice  shall  be sent to (212)  709-1093  or (212)
709-1094.  Trustee or Issuer shall  confirm  DTC's  receipt of such  telecopy by
telephoning (212) 709-1470.

For so long as the  Securities  are SDFS  Securities,  principal  payments (plus
accrued  interest,  if any) as the  result  of  optional  tenders  fro  purchase
effected  by means of DTC's Put Option  Procedures  shall be  received by DTC on
each purchase date in same-day  funds in the manner set forth in the SDFS Paying
Agent Operating Procedures.*/ Such payments shall be sent in time to be credited
to DTC's  account at the FRBNY no later than 10:00 a.m.  (Paying  Agent's  local
time) on the purchase date or as soon as possible  thereafter  following  Paying
Agent's  receipt of funds from  Issuer.  It is  understood  that:  (a) until DTC
receives such payments in its FRBNY account,  the optionally tendered Securities
will remain in Tender  Agent's DTC  account;  and (b) unless DTC  receives  such
payments in its FRBNY account by 2:00 p.m.  (Eastern  Time), it may be unable to
distribute  such payments to DTC  Participants  or release the Securities to the
Remarketing Agent that same day.

- --------
         * Beginning  on the day DTC  converts  its  settlement  systems to only
same-day funds these SDFS Paying Agent Operating Procedures will expire. At that
time,  these  principal  payments  shall  not be  paid to DTC  according  to the
instructions listed in the last paragraph of this section 3 by 2:30 p.m. ET.

                                        5

<PAGE>



For so long as the  Securities  are NDFS  Securities,  principal  payments (plus
accrued  interest,  if any) as the  result  of  optional  tenders  for  purchase
effected  by means of DTC's Put Option  Procedures  shall be  received by Cede &
Co., as nominee of DTC, or its  registered  assigns,  on each  purchase  date in
next-day  funds or the  equivalent  in  accordance  with  existing  arrangements
between  Tender Agent and DTC. Such payments  shall be made payable to the order
of  Cede  &  Co.  and  shall  be  addressed  to   Supervisor,   Put  Bond  Unit,
Reorganization Department, as indicated in paragraph 3 above.

4.        In the event of a change or proposed change in the interest-rate  mode
          of  the  Securities   from  one   variable-rate   mode  to  any  other
          variable-rate  mode, or to a fixed-rate mode,  Trustee or Issuer shall
          send a notice to DTC of such event specifying, as applicable:  (a) the
          name and number of the DTC  Participant  account to which  mandatorily
          tendered  Securities  are to be delivered by DTC on the purchase  date
          after DTC  receives  payment  for such  Securities;  and (b) the first
          interest payment date under the new mode. Such notice shall be sent to
          DTC by a secure means (e.g., legible telecopy, registered or certified
          mail,  overnight  delivery) in a timely manner designed to ensure that
          such notice is in DTC's possession no later than the close of business
          two business days before the Publication  Date. The  Publication  Date
          shall be not less  that 15 days  prior to the  expiration  date of the
          period provided for security owner  elections to retain  Securities as
          discussed  in  paragraph  6. If  delivered  by hand or sent by mail or
          overnight delivery, such notice shall be sent to both:

Manager, VRDO Eligibility Section
Underwriting Department
The Depository Trust Company
55 Water Street; 50th Floor
New York, NY 10041-0099


and
Supervisor, Put Bond Unit
Reorganization Department
The Depository Trust Company
7 Hanover Square; 23rd Floor
New York, NY 10004-2695
If sent by telecopy, such notice shall be sent to both:

DTC's Underwriting Department at
(212) 898-3726 or (212) 344-1531
and
DTC's Reorganization Department at
(212) 709-1093 or (212) 709-1094
Trustee or Issuer shall confirm  DTC's  receipt of such telecopy by  telephoning
the Underwriting Department at (212) 898-3731 and the Reorganization  Department
at (212) 709-1470.

All other  notices  regarding the interest  rate on the  Securities  (before and
after any change in the interest-rate mode) shall be delivered to Manager,  VRDO
Announcement, Dividend Department.

5.        In the event of expiration or  substitution  of a facility  supporting
          the Securities  (such as a letter of credit) or non  reinstatement  of
          the amount  available  to pay interest on the  Securities  pursuant to
          such a facility,  Trustee or Issuer shall send a notice to DTC of such
          event  specifying,  as  applicable,  the  name and  number  of the DTC
          Participant account to which mandatorily tendered Securities are to be
          delivered by DTC on the purchase  date after DTC receives  payment for
          such Securities. Such notice shall be sent to DTC by a secure means

                                        6

<PAGE>



         (e.g.,  legible  telecopy,  registered  or  certified  mail,  overnight
         delivery) in a timely manner  designed to ensure that such notice is in
         DTC's  possession no later than the close of business two business days
         before  the  Publication  Date or,  as  applicable,  immediately  after
         Trustee   receives   notice   that  the   Securities   are  subject  to
         acceleration. The Publication Date shall be not less than 15 days prior
         to the  expiration  ate of  the  period  provided  for  security  owner
         elections to retain Securities as discussed in paragraph 6. Such notice
         shall be sent to Supervisor, Put Bond Unit, Reorganization Department.

6.        Where the offering  Document  provides that the Securities are subject
          to mandatory tender except with respect to security owner elections to
          retain  Securities,  it is understood  that DTC will use it Put Option
          Procedures to process such elections. Under the Put Option Procedures,
          DTC will receive  instructions  during the applicable  election period
          from  Participants  to  retain  Securities,  DTC,  on  behalf  of such
          Participant,  will  notify  Tender  Agent of the  aggregate  principal
          amount of  Securities  that will not be tendered and will be retained.
          If the mandatorily  tendered Securities are to be replaced with two or
          more issues of Securities (the "Replacement Securities"), Tender Agent
          shall be responsible for allocating specific Replacement Securities by
          CUSIP number to the Participants that elected to retain Securities.

In cases in  which  prior to a  mandatory  tender,  certain  Securities  are not
subject to such mandatory tender, if requested as follows, DTC will exclude such
Securities  from its  mandatory  tender  procedures.  Such  request  shall be in
writing  and shall  contain:  (a)  certification  by Trustee or Issuer  that the
principal  amount of such Securities is not subject to the mandatory  tender and
certification  by a  custodian/Participant  that the  Participant's  position on
DTC's records  includes such  Securities;  and (b)  certification  by Trustee or
Issuer that the election to exclude such Securities from the mandatory tender is
authorized  under the Document.  Such request shall be sent to  Supervisor,  Put
Bond Unit,  Reorganization  Department,  in the manner indicated in paragraph 4,
above,  to ensure  that such  request is in DTC's  possession  no later than the
close of business two business days before the Publication Date of the mandatory
tender notice.

For so long as the  Securities  are SDFS  Securities,  principal  payments (plus
accrued  interest,  in any) as the  result of  mandatory  tenders  for  purchase
(including  mandatory  tenders  upon  change  in the  interest  rate mode of the
Securities, or upon expiration,  substitution, or nonreinstatement of a facility
supporting  the  Securities)  shall be received by DTC on the  purchase  date in
same-day  funds in the  manner  set  forth in the SDFS  Paying  Agent  Operating
Procedures and described on page 10, paragraph 1 in main body of OA.**/

- --------
         ** Beginning on the day DTC  converts  its  settlement  systems to only
same-day funds the SDFS Paying Agent Operating  Procedures will expire.  At that
time,  these  principal   payments  shall  be  paid  to  DTC  according  to  the
instructions listed in the next paragraph of this section 6.

                                        7

<PAGE>



For so long as the Securities are NDFS Securities, such principal payments shall
be received  by DTC on the  purchase  date in  next-day  funds in the manner set
forth on page 10, paragraph 1 in main body of OA.


                                        8

<PAGE>

                                                          Date:  March 15, 1995



The Depository Trust Company
Mr. Vincent A. Mauro
Vice President
55 Water Street-19th Floor
New York, NY  10041

                                                                     CA07295047

Dear Mr. Mauro:

Re:      Operational Arrangements Letter of Representations

From time to time,  this  organization  may be  appointed  as a trustee,  paying
agent,  transfer agent, or an agent in some other capacity for securities issues
that DTC will be requested to make  eligible for its services.  The  undersigned
confirms that when this  organization  acts in one of these  capacities  for any
such issues,  it hereby  represents  that, to the extent within its control,  it
will comply with the  requirements  stated in the DTC  Operational  Arrangements
memorandum dated December 12, 1994, as they may be amended from time to time.



                                First Trust of California, National Association
                                -----------------------------------------------
                                              (Name of Organization)


                                -----------------------------------------------
                                         (Authorized Officer's Signature)


                                -----------------------------------------------
                                                (Please Print Name)


                                -----------------------------------------------
                                                      (Title)



                            TAX REGULATORY AGREEMENT


                                      Among

               California Economic Development Financing Authority

                First Trust of California, National Association,
                                   as Trustee,

                                       and

                   Advanced Aerodynamics and Structures, Inc.

              -----------------------------------------------------

                           Dated as of August 1, 1997

              -----------------------------------------------------



                   Executed as Part of the Proceedings for the
                         Authorization and Issuance of:

                                   $8,500,000
               California Economic Development Financing Authority
                              Variable Rate Demand
                Industrial Development Revenue Bonds, Series 1997
              (Advanced Aerodynamics and Structures, Inc. Project)











<PAGE>




              -----------------------------------------------------

                                TABLE OF CONTENTS

              -----------------------------------------------------


         (This Table of Contents is for convenience of reference only and is not
part of the Tax Regulatory Agreement.)

                                    ARTICLE I

                                   DEFINITIONS

Section 1.1.  Definitions.....................................................1
Section 1.2.  Reliance on Borrower's Information..............................12

                                   ARTICLE II

                             CERTAIN REPRESENTATIONS
                                 BY THE BORROWER

Section 2.1.   Description of the Project and Description of the Facilities...12
Section 2.2.   Capital Expenditures...........................................13
Section 2.3.   Prior Issues and $40 Million Limit.............................14
Section 2.4.   Federal Tax Return Information.................................14
Section 2.5.   Composite Issues...............................................14
Section 2.6.   Prohibited Uses................................................15
Section 2.7.   No Composite Project...........................................15
Section 2.8.   Acquisition of Existing Property...............................15
Section 2.9.   Land Acquisition Limit and No Acquisition of Farmland..........16
Section 2.10.  Representations by the Borrower for Purposes of IRS Form 8038..16

                                   ARTICLE III

                              USE OF BOND PROCEEDS

Section 3.1.  Anticipated Use of Proceeds.....................................17
Section 3.2.  Certification as to Costs of the Project........................18

                                   ARTICLE IV

                                    ARBITRAGE

Section 4.1.  Arbitrage Representations and Elections.........................18
Section 4.2.  Arbitrage Compliance............................................20
Section 4.3.  Calculation of Rebate Amount....................................20




                                        i

<PAGE>



Section 4.4.  Payment to United States........................................23
Section 4.5.  Recordkeeping...................................................23
Section 4.6.  Rebate Analyst..................................................24

                                    ARTICLE V
                             COMPLIANCE WITH CODE.............................24

                                   ARTICLE VI

                       TERM OF TAX REGULATORY AGREEMENT.......................26

                                   ARTICLE VII

                                   AMENDMENTS.................................26

                                  ARTICLE VIII

                           EVENTS OF DEFAULT, REMEDIES

Section 8.1. Events of Default................................................26
Section 8.2.  Remedies for an Event of Default................................26


EXHIBIT A-1-Sources and Uses of Funds......................................A-1-1
EXHIBIT A-2-Property Financed or Refinanced by the Bonds...................A-2-1
EXHIBIT B-1-Form of Dealer Certification of Bona Fide Bid Price of a
                           Certificate of Deposit..........................B-1-1
EXHIBIT B-2-Form of Dealer Certification for a Certificate of Deposit
                           for Which No Active Secondary Market Exists.....B-2-1
EXHIBIT B-3-Form of Provider Certification for a Certificate of Deposit....B-3-1
EXHIBIT B-4-Form of Provider Certification For an Investment Contract......B-4-1
EXHIBIT B-5-Form of Borrower's Certification for a
                           Certificate of Deposit Involving Three Bids.....B-5-1
EXHIBIT B-6-Form of Borrower's Certification for an
                           Investment Contract Involving Three Bids........B-6-1
EXHIBIT C-Useful Life Calculation............................................C-1
EXHIBIT D-Declaration of Official Intent.....................................D-1




                                       ii

<PAGE>



                            TAX REGULATORY AGREEMENT


         THIS TAX REGULATORY AGREEMENT (this "Tax Regulatory Agreement") is made
and dated as of August 1, 1997,  by and among  California  Economic  Development
Financing  Authority  and its  successors  or assigns (the  "Issuer"),  Advanced
Aerodynamics  and  Structures,  Inc., a corporation  duly organized and existing
under the laws of the State of  California  and its  successors  or assigns (the
"Borrower"), and First Trust of California,  National Association, solely in its
capacity as trustee under the Indenture, as defined below (the "Trustee");

                              W I T N E S S E T H:

         WHEREAS, the Issuer has authorized the issuance of $8,500,000 aggregate
principal  amount of its Variable  Rate Demand  Industrial  Development  Revenue
Bonds,  Series 1997 (Advanced  Aerodynamics and Structures,  Inc.  Project) (the
"Bonds"),  the proceeds of which are being loaned to the Borrower  pursuant to a
Loan Agreement,  dated as of August 1, 1997, between the Issuer and the Borrower
(the   "Agreement"),   to  finance  the   construction  and  installation  of  a
manufacturing  facility and the acquisition of certain manufacturing  equipment,
as more fully set forth in the Agreement (the "Project") and to pay a portion of
the costs of issuance of the Bonds;

         WHEREAS,  the Borrower will use the Project in the  manufacture of wire
bonding tools and accessories or for the manufacture of other tangible  personal
property; and

          WHEREAS,  the  Issuer  has  determined  that  the  issuance,  sale and
delivery of the Bonds is needed to finance the Project; and

         WHEREAS,  this Tax  Regulatory  Agreement  has been entered into by the
Issuer, the Borrower and the Trustee to ensure compliance with the provisions of
the Internal  Revenue Code of 1986, as amended,  and the Regulations  thereunder
(the "Code"); and

         WHEREAS,  to  ensure  that  interest  on the Bonds  will be and  remain
excludable from gross income under the Code, the restrictions listed in this Tax
Regulatory Agreement must be satisfied.

         NOW THEREFORE, the Issuer, the Borrower and the Trustee hereby agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

         Section 1.1.  Definitions.  The following  words and phrases shall have
the following meanings. Any capitalized word or term used herein but not defined
herein shall have the same meaning given in the hereinafter defined Indenture.





<PAGE>




         "Abusive Arbitrage Device" means any action which has the effect of (i)
enabling the Issuer or the Borrower to exploit the  difference  between  taxable
and tax-exempt interest rates to obtain a material financial advantage; and (ii)
overburdening  the  tax-exempt  bond  market as defined in ss.  1.148-10  of the
Regulations.

         "Accounting  Method" means both the overall  method used to account for
the Gross  Proceeds of the Bonds  (e.g.,  the cash method or a modified  accrual
method)  and the method  used to account for or  allocate  any  particular  item
within  that  overall  accounting  method  (e.g.,  accounting  for  Investments,
Expenditures,  allocations to and from different sources and particular items of
the foregoing).

         "Agreement" means Loan Agreement,  dated as of August 1, 1997,  between
the Issuer and the Borrower, and any amendments and supplements thereto.

         "Average Economic Life" means the average reasonably  expected economic
life of the Facilities as defined in ss. 147(b) of the Code.

          "Average  Maturity" means the average maturity of the Bonds as defined
in ss. 147(b) of the Code.

         "Bond Counsel" means a law firm of nationally  recognized  bond counsel
who is requested to deliver its  approving  opinion with respect to the issuance
of and the exclusion from federal income taxation of interest on the Bonds.

         "Bond Year" means the period  commencing August 1 of each calendar year
and  terminating on July 31 of the immediately  succeeding  calendar year during
the term of the Bonds,  except  that the first Bond Year shall  commence  on the
Date of Issuance and end on July 31, 1998 (unless a different period is required
by the Regulations or selected by the Borrower pursuant to the Regulations).

         "Bond Yield" means the Yield of the Bonds calculated in accordance with
Section 1.148-4 of the Regulations.

         "Borrower"  means  Advanced   Aerodynamics  and  Structures,   Inc.,  a
corporation  duly  organized  and  existing  under  the  laws  of the  State  of
California or any entity which is the surviving,  resulting or transferee entity
in any merger, consolidation or transfer permitted under the Agreement.

         "Capital  Expenditure"  means  any  cost  of a type  that  is  for  the
acquisition, construction,  reconstruction or improvement of land or property of
a character  subject to the  allowance  for  depreciation.  For  example,  costs
incurred to acquire,  construct,  reconstruct  or improve  land,  buildings  and
equipment  generally  are  Capital  Expenditures.  Whether an  expenditure  is a
capital  expenditure  is  determined  at the time the  expenditure  is paid with
respect  to the  property.  Future  changes  in law do  not  affect  whether  an
expenditure is a capital expenditure.




                                        2

<PAGE>




         "Capital  Project"  means all Capital  Expenditures  that carry out the
governmental  purpose of the Bonds.  For example,  a Capital Project may include
Capital  Expenditures for one or more building  improvements or equipment,  plus
related  capitalized  interest paid or accrued prior to the in-service  date for
the Capital Project.

         "Class  of  Investments"  means  one of the  following,  each of  which
represents a different Class of Investments:

         (a) Each category of yield  restricted  Purpose  Investment and Program
Investment,  as  defined  in ss.  1.148-1(b),  that is  subject  to a  different
definition of materially higher Yield under ss. 1.148-2(d)(2);

         (b) Yield restricted Nonpurpose Investments; and

         (c) All other Nonpurpose Investments.

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Collateral   Account"  means  the  interest  bearing  deposit  account
established by the Borrower with the Bank pursuant to the Investment  Agreement,
dated August 5, 1997, between the Bank and the Borrower to secure the Borrower's
obligations to the Bank under the Reimbursement Agreement.

     "Computation  Date"  means an  Installment  Computation  Date or the  Final
Computation Date.

         "Computation  Date  Credit"  means on the last  day of each  Bond  Year
during  which  there are Gross  Proceeds  subject to the rebate  requirement  of
Article IV hereof, and on the Final Computation Date, the amount of $1,000.

         "Consistently  Applied" means applied  uniformly within a fiscal period
and between  fiscal  periods to account  for Gross  Proceeds of an issue and any
amounts that are in a commingled fund.

         "Costs of Issuance"  means all costs  incurred in  connection  with the
issuance of the Bonds,  other than fees paid to or on behalf of credit enhancers
as  fees  for  "qualified  guarantees"  as  defined  in  ss.  1.148-4(f)  of the
Regulations  or to the Issuer as a portion of its higher Yield  permitted on the
Agreement  under ss.  1.148-2(d)(2)  of the  Regulations.  Examples  of Costs of
Issuance include (but are not limited to):

                  (a) underwriter's spread (whether realized directly or derived
         through  purchase of the Bonds at a discount below the price at which a
         substantial  number of the Bonds are sold to the  public) or  placement
         agent's fee;





                                        3

<PAGE>



                  (b)  counsel  fees  (including  bond  counsel,   underwriter's
         counsel,  placement  agent's  counsel,  issuer's  counsel,   borrower's
         counsel,  trustee's  counsel,  and any other  specialized  counsel fees
         incurred in connection with the issuance of the Bonds);

                  (c)  financial advisor fees incurred in connection with the 
          issuance of the Bonds;

                  (d) rating  agency fees  (except for any such fee that is paid
         in connection  with or as a part of the fee for credit  enhancement  of
         the Bonds);

                  (e) trustee fees incurred in  connection  with the issuance of
         the Bonds;

                  (f) accountant  fees incurred in connection  with the issuance
         of the Bonds;

                  (g) printing costs (for the Bonds and of the  preliminary  and
         final offering circulars or official statements);

                  (h) costs  incurred in  connection  with the  required  public
         approval process (e.g.,  publication costs for public notices generally
         and costs of the public hearing); and

                  (i) Issuer  fees to cover  administrative  costs and  expenses
         incurred in connection with the issuance of the Bonds.

         "Current Outlay of Cash" means an outlay  reasonably  expected to occur
not later than 5 banking days after the date as of which the allocation of Gross
Proceeds to the Expenditure is made.

         "Date of Issuance" means August 5, 1997.

         "Discharged"  means,  with  respect to any Bond,  the date on which all
amounts due with respect to such Bond are actually and  unconditionally  due, if
cash is available at the place of payment,  and no interest accrues with respect
to such Bond after such date.

         "Economic  Accrual Method" (also known as the constant  interest method
or actuarial  method)  means the method of computing  Yield that is based on the
compounding of interest at the end of each compounding period.

         "Exempt Person" means any organization  described in Section  501(c)(3)
of the Code or a state or a local governmental unit of a state.

         "Expenditure"  means a book or record entry which allocates Proceeds of
the Bonds in connection with a Current Outlay of Cash.





                                        4

<PAGE>



         "Facilities"  means the  Manufacturing  Facility financed or refinanced
with the Proceeds of the Bonds and described in Exhibit A-2 hereto.

         "Fair  Market  Value"  means the price at which a willing  buyer  would
purchase  an  Investment  from a  willing  seller in a bona  fide,  arm's-length
transaction.  Fair Market Value  generally is  determined on the date on which a
contract to purchase or sell the Nonpurpose  Investment  becomes  binding (i.e.,
the trade date rather than the settlement date). Except as otherwise provided in
this  definition,  an Investment  that is not of a type traded on an established
securities  market  (within the meaning of ss. 1273 of the Code),  is rebuttably
presumed to be acquired or disposed of for a price that is not equal to its Fair
Market Value. The Fair Market Value of a United States Treasury  obligation that
is purchased directly from the United States Treasury is its purchase price. The
following  guidelines  shall apply for purposes of  determining  the Fair Market
Value of the obligations described below:

                  (a)  Certificates of Deposit.  The purchase of certificates of
         deposit  with  fixed  interest  rates,   fixed  payment  schedules  and
         substantial  penalties  for  early  withdrawal  will be deemed to be an
         Investment  purchased at its Fair Market Value on the purchase  date if
         the Yield on the certificate of deposit is not less than:

                            (i)  The  Yield  on  reasonably   comparable  direct
                  obligations of the United States; and

                           (ii) The highest Yield that is published or posted by
                  the  provider to be currently  available  from the provider on
                  reasonably  comparable  certificates of deposit offered to the
                  public.

                  (b) Guaranteed Investment  Contracts.  A Guaranteed Investment
         Contract is a Nonpurpose  Investment that has  specifically  negotiated
         withdrawal or  reinvestment  provisions and a  specifically  negotiated
         interest rate, and also includes any agreement to supply Investments on
         two or more  future  dates  (e,g,,  a  forward  supply  contract).  The
         purchase  price of a Guaranteed  Investment  Contract is treated as its
         Fair Market Value on the purchase date if:

                            (i) The Borrower makes a bona fide  solicitation for
                  a specified  Guaranteed  Investment  Contract  and receives at
                  least  three  bona  fide  bids  from  providers  that  have no
                  material   financial   interest   in  the  issue   (e.g.,   as
                  underwriters or brokers);

                           (ii)  The  Borrower  purchases  the  highest-Yielding
                  Guaranteed  Investment  Contract for which a qualifying bid is
                  made (determined net of broker's fees);

                          (iii) The Yield on the Guaranteed  Investment Contract
                  (determined  net of broker's  fees) is not less than the Yield
                  then available from the provider on




                                        5

<PAGE>



                  reasonably comparable Guaranteed Investment Contracts, if any,
                  offered  to other  persons  from a source of funds  other than
                  gross proceeds of tax-exempt bonds;

                           (iv) The determination of the terms of the Guaranteed
                  Investment Contract takes into account as a significant factor
                  the Borrower's  reasonably  expected drawdown schedule for the
                  amounts to be invested, exclusive of amounts deposited in debt
                  service funds and reasonably  required  reserve or replacement
                  funds;

                            (v) The terms of the Guaranteed Investment Contract,
                  including  collateral security  requirements,  are reasonable;
                  and

                           (vi)  The  obligor  on  the   Guaranteed   Investment
                  Contract certifies the administrative  costs that it is paying
                  (or expects to pay) to third  parties in  connection  with the
                  Guaranteed Investment Contract.

         "Final Computation Date" means the date the last Bond is Discharged.

         "Future  Value"  means the Value of a Receipt  or Payment at the end of
any interval as determined by using the Economic  Accrual  Method and equals the
Value of that Payment or Receipt when it is paid or received (or treated as paid
or received),  plus interest assumed to be earned and compounded over the period
at a rate equal to the Yield on the Bonds,  using the same compounding  interval
and financial conventions used to compute the Yield on the Bonds.

          "Gross  Proceeds"  means any Proceeds or  Replacement  Proceeds of the
Bonds.

         "Indenture"  means, the Indenture of Trust, dated as of August 1, 1997,
between the Issuer and the Trustee, and any amendments and supplements thereto.

         "Installment  Computation  Date"  means the last day of the fifth  Bond
Year and each succeeding  fifth Bond Year as stated in Section 4.1 hereof or the
last day of any Bond Year prior to the fifth Bond Year  selected by the Borrower
as stated in Section 4.1 hereof.

         "Investment"  means any Purpose  Investment or  Nonpurpose  Investment,
including any other tax-exempt bond.

         "Investment Instructions" means the letter of instructions set forth as
an exhibit to the No Arbitrage  Certificate  of the Issuer dated the date of the
initial delivery of the Bonds.

         "Investment  Proceeds"  means any amounts  actually  or  constructively
received from investing Proceeds of the Bonds.

         "Investment-Type  Property"  means any  property,  other than  property
described  in ss.  148(b)(2)(A),  (B),  (C) or (E) of  the  Code  that  is  held
principally as a passive vehicle for the




                                        6

<PAGE>



production of income. Except as otherwise provided, a prepayment for property or
services is Investment-Type  Property if a principal purpose for prepaying is to
receive an Investment return from the time the prepayment is made until the time
payment  otherwise would be made. A prepayment is not  Investment-Type  Property
if--

                  (a) The prepayment is made for a substantial  business purpose
         other  than  Investment  return  and  the  issuer  has no  commercially
         reasonable alternative to the prepayment, or

                  (b) Prepayments on substantially  the same terms are made by a
         substantial  percentage  of persons who are  similarly  situated to the
         issuer but who are not beneficiaries of tax-exempt financing.

         "Issue  Price"  means,  except as  otherwise  provided,  issue price as
defined in ss.ss. 1273 and 1274 of the Code. Generally, the Issue Price of bonds
that are publicly  offered is the first price at which a  substantial  amount of
the bonds is sold to the public. Ten percent is a substantial amount. The public
does not include bond houses, brokers or similar persons or organizations acting
in the capacity of underwriters or wholesalers.  The Issue Price does not change
if part of the issue is later  sold at a  different  price.  The Issue  Price of
bonds that are not substantially  identical is determined separately.  The Issue
Price of bonds for which a bona fide public offering is made is determined as of
the sale date based upon  reasonable  expectations  regarding the initial public
offering  price.  If a bond is  issued  for  property,  the  applicable  Federal
tax-exempt  rate is used in lieu of the Federal  rate in  determining  the Issue
Price under ss. 1274 of the Code.  The issue price of bonds may not exceed their
Fair Market Value as of the sale date.
With respect to the Bonds, the Issue Price is $8,500,000.

         "Manufacturing  Facility"  means a Capital  Project that is used in the
manufacturing  or  production  of  tangible  personal  property  (including  the
processing  resulting in a change in the condition of such  property)  including
facilities that are directly  related and ancillary to a Manufacturing  Facility
if such directly  related and ancillary  facilities are located on the same site
as the Manufacturing Facility and not more than 25 percent of the proceeds of an
issue that finances the Manufacturing Facility are used to provide such directly
related and ancillary facilities.

         "Net Sale Proceeds" means Sale Proceeds, less the portion of those Sale
Proceeds invested in a reasonably required reserve or replacement fund under ss.
148(d) of the Code and as part of a minor portion under ss. 148(e) of the Code.

         "Nonpurpose  Investment"  means  any  security,   obligation,   annuity
contract  or  Investment  type  property  as defined in ss.  148(b) of the Code,
including  "specified  private activity bonds" as defined in ss.  57(a)(5)(c) of
the  Code,  but  excluding  all  other  obligations  the  interest  on  which is
excludable from federal gross income. The term "Nonpurpose  Investment" does not
include the Borrower's  obligations  to make payments to the Issuer  pursuant to
the provisions of the Agreement.




                                        7

<PAGE>




         "Payments"  means,  for purposes of computing  the Rebate  Amount,  (a)
amounts actually or constructively  paid to acquire a Nonpurpose  Investment (or
treated as paid to a commingled  fund); (b) for a Nonpurpose  Investment that is
allocated  to an  issue  on a date  after  it is  actually  acquired  (e.g.,  an
Investment  that becomes  allocable to  Transferred  Proceeds or to  Replacement
Proceeds) or that  becomes  subject to the rebate  requirement  of the Code on a
date  after  it  is  actually  acquired  (e.g.,  an  Investment  allocated  to a
reasonably  required reserve or replacement fund for a construction issue at the
end of the two-year spending period), the Value of that Investment on that date;
(c) for a Nonpurpose Investment that was allocated to an issue at the end of the
preceding  computation  period, the Value of that Investment at the beginning of
the computation period; (d) on the last day of each Bond Year during which there
are  amounts  allocated  to Gross  Proceeds  of an issue that are subject to the
rebate  requirement  of the Code,  and on the final maturity date, a Computation
Date Credit;  and (e) Yield Reduction  Payments on Nonpurpose  Investments  made
pursuant to ss.  1.148-5(c)  of the  Regulations.  For purposes of computing the
Yield on an Investment  (including the Value of the  Investment),  Payment means
amounts  to be  actually  or  constructively  paid to  acquire  the  Investment;
provided,  however,  that  payments  made  by a  conduit  borrower,  such as the
Borrower,  are not treated as paid until the conduit  borrower ceases to receive
the benefit of earnings on those  amounts.  Payments on  Investments,  including
Guaranteed Investment Contracts, are adjusted for Qualified Administrative Costs
of acquiring a Nonpurpose Investment.

         "Pre-Issuance  Accrued  Interest" means amounts  representing  interest
that accrued on an obligation  for a period not greater than one year before the
Date of  Issuance  but only if those  amounts are paid within one year after the
Date of Issuance.

         "Principal  User"  means a person who is a principal  owner,  principal
lessee, a principal  output purchaser or "other"  principal user and any Related
Person to a Principal  User. A principal owner is a person who at any time holds
more than a 10 percent  ownership  interest  (by value) in a facility  or, if no
person  holds more than a 10  percent  ownership  interest,  then the person (or
persons in the case of multiple  equal  owners) who holds the largest  ownership
interest in the facility.  A person is treated as holding an ownership  interest
if such  person  is an owner  for  federal  income  tax  purposes  generally.  A
principal  lessee is a person who at any time leases more than 10 percent of the
facility  (disregarding  portions used by the lessee under a short-term  lease).
The  portion  of a  facility  leased  to a lessee  is  generally  determined  by
reference to its fair rental value.  A short-term  lease is one which has a term
of one year or less,  taking into  account  all options to renew and  reasonably
anticipated  renewals.  A principal output purchaser is any person who purchases
output of a facility,  unless the total output  purchased by such person  during
each one-year period  beginning with the date such facility is placed in service
is 10 percent or less of such  facility's  output  during each such  period.  An
"other"  principal user is a person who enjoys a use of a facility (other than a
short-term use) in a degree  comparable to the enjoyment of a principal owner or
a  principal   lessee,   taking  into  account  all  the   relevant   facts  and
circumstances,  such as the person's  participation  in control over use of such
facility or its remote or proximate geographic location.





                                                         8

<PAGE>



         "Prior  Issues" means any issue of tax-exempt  obligations  (whether or
not the issuer of each issue is the same) to which Section 103(b)(6) of the 1954
Code or Section 144(a) of the Code applies.

         "Proceeds" means any Sale Proceeds, Investment Proceeds and Transferred
Proceeds of an issue.  Proceeds do not  include,  however,  amounts  actually or
constructively  received with respect to a Purpose  Investment that are properly
allocable  to  the  immaterially  higher  Yield  under  ss.  1.148-2(d)  of  the
Regulations or section 143(g) of the Code or to Qualified  Administrative  Costs
recoverable under ss. 1.148-5(e) of the Regulations.

         "Project" has the meaning given to such term in the preambles hereto.

          "Project  Fund" means the  Project  Fund  established  pursuant to the
Indenture.
          "Purchase  Fund" means the Purchase Fund  established  pursuant to the
Indenture.

          "Purpose Investment" means an Investment that is acquired to carry out
the governmental
purpose of an issue.  The Agreement constitutes a Purpose Investment.

         "Qualified    Administrative    Costs"   means    reasonable,    direct
administrative  costs,  other than carrying  costs,  such as  separately  stated
brokerage  or  selling   commissions,   but  not  legal  and  accounting   fees,
recordkeeping,  custody and similar  costs.  General  overhead costs and similar
indirect costs of the issuer such as employee  salaries and office  expenses and
costs   associated   with   computing   the  Rebate  Amount  are  not  Qualified
Administrative Costs. In general, administrative costs are not reasonable unless
they are comparable to  administrative  costs that would be charged for the same
Investment  or a reasonably  comparable  Investment if acquired with a source of
funds other than Gross Proceeds of tax-exempt bonds.

         "Qualified  Hedging  Transaction"  means a  contract  which  meets  the
requirements of ss. 1.148-4(h)(2) of the Regulations.

         "Rebate Amount" means the excess of the Future Value of all Receipts on
Nonpurpose  Investments  over the Future Value of all the Payments on Nonpurpose
Investments.  Future Value is computed as of the Computation Date. Rebate Amount
additionally  includes any penalties and interest on  underpayments  reduced for
recoveries of overpayments.

         "Rebate  Analyst"  shall mean the entity chosen by the Borrower and the
Issuer in accordance with Section 4.6 hereof to determine the amount of required
deposits to the Rebate Fund, if any.

          "Rebate  Fund"  means the  Rebate  Fund  established  pursuant  to the
Indenture.

         "Receipts"  means,  for purposes of computing  the Rebate  Amount,  (a)
amounts  actually  or  constructively  received  from  a  Nonpurpose  Investment
(including amounts treated as received




                                        9

<PAGE>



from a commingled  fund),  such as earnings and return of  principal;  (b) for a
Nonpurpose  Investment  that  ceases  to be  allocated  to an issue  before  its
disposition or redemption date (e.g.,  an Investment  that becomes  allocable to
Transferred  Proceeds  of another  issue or that ceases to be  allocable  to the
issue  pursuant to the universal cap under ss.  1.148-6 of the  Regulations)  or
that  ceases  to be  subject  to the  rebate  requirement  of the Code on a date
earlier than its disposition or redemption  date (e.g., an Investment  allocated
to a fund  initially  subject  to the  rebate  requirement  of the Code but that
subsequently  qualifies  as a bona fide debt  service  fund),  the Value of that
Nonpurpose  Investment on that date; and (c) for a Nonpurpose Investment that is
held at the end of a computation period, the Value of that Investment at the end
of that period. For purposes of computing Yield on an Investment, Receipts means
amounts to be actually or constructively  received from the Investment,  such as
earnings  and  return  of  principal  (including  the  Value of an  Investment).
Receipts on Investments, including Guaranteed Investment Contracts, are adjusted
(reduced) for Qualified Administrative Costs.

         "Recomputation Event" means a transfer, waiver, modification or similar
transaction  of any right that is part of the terms of the Bonds or a  Qualified
Hedging  Transaction  is entered into,  or  terminated,  in connection  with the
Bonds.

         "Regulation" or  "Regulations"  means the temporary,  proposed or final
Income  Tax  Regulations  promulgated  by the  Department  of the  Treasury  and
applicable to the Bonds,  including ss.ss.  1.148-0 through 1.148-11,  ss. 1.149
and ss.ss. 1.150-1 and 1.150-2 as issued by the Internal Revenue Service on June
18, 1993 for bonds  issued after July 1, 1993,  including  any  amendments  made
thereto.

         "Related  Person"  means  any  person if (i) the  relationship  to such
person would result in a  disallowance  of loss under  Sections 267 or 707(b) of
the Code or (ii)  such  person  is a  member  of the  same  controlled  group of
corporations (as defined in Section 1563(a) of the Code,  except that "more than
50 percent" shall be substituted for "at least 80 percent" each place it appears
therein).

         "Replacement  Proceeds" means amounts which have a sufficiently  direct
nexus to the Bonds or to the governmental  purpose of the Bonds to conclude that
the amounts would have been used for that  governmental  purpose if the Proceeds
of the Bonds were not used or to be used for that governmental  purpose, as more
fully defined in ss. 1.148-1(c) of the Regulations.

         "Revenue  Fund"  means the  Revenue  Fund  established  pursuant to the
Indenture.

         "Sale Proceeds" means any amounts actually or  constructively  received
from the sale of the Bonds, including amounts used to pay underwriters' discount
or  compensation  or  placement  agent's  fee and  accrued  interest  other than
Pre-Issuance Accrued Interest.

         "SLGS" means United States Treasury Certificates of Indebtedness, Notes
and Bonds-State and Local Government Series.





                                       10

<PAGE>



         "Tax Regulatory Agreement" means this Tax Regulatory Agreement.

         "Test-Period  Beneficiary"  means  any  person  who  is an  owner  or a
Principal  User of  facilities  financed  by an issue or  issues  of  tax-exempt
obligations  issued under the 1954 Code or the Code during the three-year period
beginning on the later of the date such facilities were placed in service or the
date of  issuance  for such  issue or  issues  of  tax-exempt  obligations.  For
purposes  of  determining  whether a person is a  Test-Period  Beneficiary,  all
persons who are Related Persons shall be treated as one person.

         "Transferred Proceeds" means Proceeds of a refunding issue which become
transferred  proceeds of a  refunding  issue and cease to be Proceeds of a prior
issue when Proceeds of the  refunding  issue  discharge  any of the  outstanding
principal  amount of the prior issue.  The amount of Proceeds of the prior issue
that become  transferred  proceeds of the refunding  issue is an amount equal to
the Proceeds of the prior issue on the date of that  discharge  multiplied  by a
fraction:

                  (a) The  numerator  of which is the  principal  amount  of the
         prior issue discharged with Proceeds of the refunding issue on the date
         of that discharge; and

                  (b)  The  denominator  of  which  is  the  total   outstanding
         principal amount of the prior issue on the date immediately  before the
         date of that discharge.

         "Universal Cap" means the Value of all outstanding Bonds.

         "Value"  means  Value  as  determined  under  ss.   1.148-4(e)  of  the
Regulations  for a  Bond  and  Value  determined  under  ss.  1.148-5(d)  of the
Regulations for an Investment.

         "Yield" means,  for purposes of determining the Yield on the Bonds, the
Yield computed  under the Economic  Accrual  Method using  consistently  applied
compounding  intervals  of not more than one  year.  A short  first  compounding
interval and a short last  compounding  interval may be used. Yield is expressed
as an annual  percentage rate that is calculated to at least four decimal places
(e.g., 5.2525 percent). Other reasonable,  standard financial conventions,  such
as the 30 days per month/360 days per year convention,  may be used in computing
Yield but must be  consistently  applied.  The Yield on an issue that would be a
Purpose Investment  (absent ss.  148(b)(3)(A) of the Code) is equal to the Yield
on the conduit financing issue that financed that Purpose Investment.  The Yield
on a fixed yield issue is the discount  rate that,  when used in  computing  the
present Value as of the issue date of all  unconditionally  payable  payments of
principal,  interest and fees for qualified  guarantees on the issue and amounts
reasonably  expected to be paid as fees for  qualified  guarantees on the issue,
produces an amount equal to the present Value,  using the same discount rate, of
the  aggregate  issue price of bonds of the issue as of the issue  date.  In the
case of obligations  purchased or sold at a substantial discount or premium, the
Regulations  prescribe certain special Yield calculation  rules. For purposes of
determining  the Yield on an  Investment,  the Yield computed under the Economic
Accrual Method,  using the same compounding  interval and financial  conventions
used to compute the Yield on the Bonds.




                                       11

<PAGE>




         The Yield on an Investment  allocated to the Bonds is the discount rate
that,  when used in computing the present Value as of the date the Investment is
first allocated to the issue of all  unconditionally  payable  receipts from the
Investment, produces an amount equal to the present Value of all unconditionally
payable  payments for the  Investment.  The Yield on an Investment  shall not be
adjusted  by any  hedging  transaction  entered  into in  connection  with  such
Investment  unless the Issuer,  the Trustee and the  Borrower  have  received an
opinion of Bond Counsel that such an adjustment is permitted by the Regulations.
Yield shall be calculated separately for each Class of Investments.

         "Yield  Reduction  Payment"  means a payment to the United  States with
respect to an Investment  which is treated as a Payment for that Investment that
reduces the Yield on that  Investment in accordance  with ss.  1.148-5(c) of the
Regulations.  Yield Reduction Payments include Rebate Amounts paid to the United
States.

         "1954 Code" means the Internal Revenue Code of 1954, as amended,  as in
effect on the effective date of the Code.

         Section 1.2. Reliance on Borrower's  Information.  Bond Counsel and the
Issuer  shall be  permitted  to rely  upon the  contents  of any  certification,
document or instructions  provided pursuant to this Tax Regulatory Agreement and
shall not be responsible or liable in any way for the accuracy of their contents
or the failure of the Borrower to deliver any required information.

                                   ARTICLE II

                             CERTAIN REPRESENTATIONS
                                 BY THE BORROWER

         Section  2.1.  Description  of  the  Project  and  Description  of  the
Facilities.

         The  Borrower  hereby  represents  and  warrants for the benefit of the
Issuer, the Trustee and the registered owners of the Bonds that:

                  (a) The  description of the Project set forth in the preambles
         hereto and the  description  of the Facilities set forth in Exhibit A-2
         hereto are true and accurate.

                  (b) The  Facilities  constitute  a  Manufacturing  Facility of
         advanced  propjet and jet aircraft or facilities  directly  related and
         ancillary to such Manufacturing Facility.

                  (c) The portion of the  Facilities  which  constitutes  office
         space serves solely the manufacturing portion of the Facilities,  is on
         the same site as the  manufacturing  portion of the  Facilities  and is
         financed  with not more  than 25  percent  of the net  Proceeds  of the
         Bonds.

         Section 2.2.  Capital Expenditures.




                                       12

<PAGE>




         The  Borrower  hereby  represents  and  warrants for the benefit of the
Issuer, the Trustee and the registered owners of the Bonds that:

                  (a) During the period beginning three years before the Date of
         Issuance and ending on the Date of Issuance,  the  aggregate  amount of
         Capital Expenditures  (including any expenditure that was or could have
         been treated as a Capital  Expenditure under any rule or election under
         the Code) paid or incurred,  excluding  those to be paid or  reimbursed
         with Proceeds of the Bonds,  with respect to (i) facilities  located in
         the incorporated  municipality (or unincorporated  county) in which the
         Facilities  are located and (ii) the Principal  User of which was or is
         the Borrower, any other Principal User of the Facilities or any Related
         Person thereto, was $6,000.

                  (b) During the period  beginning  on the Date of Issuance  and
         ending  on the  date  three  years  after  the  Date of  Issuance,  the
         aggregate  amount of Capital  Expenditures  (including any  expenditure
         that was or could have been treated as a Capital  Expenditure under any
         rule or election  under the Code)  expected to be  incurred,  excluding
         those to be paid or reimbursed with Proceeds of the Bonds, with respect
         to  (i)  facilities  located  in  the  incorporated   municipality  (or
         unincorporated county) in which the Facilities are located and (ii) the
         Principal  User of which was or is the  Borrower,  any other  Principal
         User of the Facilities or any Related Person thereto, is anticipated to
         be $800,000.

                  (c)  The  amount  of  capitalized  interest  to be paid on all
         financings for the Facilities  excluding that paid from Proceeds of the
         Bonds  is  $0.  The  amount  of  Capitalized  interest  to be  paid  in
         connection  with the  Facilities  paid  from  Proceeds  of the Bonds is
         $184,000.

                  (d) The  sum of (i)  the  Capital  Expenditures  described  in
         paragraph  (a) above plus (ii) the actual  Capital  Expenditures  to be
         incurred  as  described  in  paragraphs  (b) and  (c)  plus  (iii)  the
         aggregate  outstanding  amount of all $1 million or $10 million  exempt
         small issues set forth in Section 2.3(a) below plus (iv) the greater of
         the Issue  Price or the par  amount of the Bonds  shall not  exceed $10
         million.

                  (e) The information contained in subsections (a), (b), (c) and
         (d) above,  which has been  provided to the Issuer to enable the Issuer
         to elect to qualify the Bonds for the $10,000,000 exemption afforded by
         Section  144(a)(4) of the Code,  is true,  accurate and  complete.  The
         Issuer  hereby  elects  to issue the Bonds  pursuant  to the  exemption
         afforded by Section 144(a)(4) of the Code.

                  (f)  The  Facilities  will  not be  sold,  leased  or the  use
         otherwise  transferred  to a person other than the Borrower,  any other
         Principal  User  of  the  Facilities  or  any  Related  Person  thereto
         identified  as of the Date of  Issuance  during the  three-year  period
         ending three years after the Date of Issuance,  unless the Borrower has
         received an  approving  opinion of Bond Counsel to the effect that such
         sale, lease or transfer will not adversely affect the tax-exempt status
         of the Bonds.




                                       13

<PAGE>




         Section 2.3.  Prior Issues and $40 Million Limit.

         The  Borrower  hereby  represents  and  warrants for the benefit of the
Issuer, the Trustee and the registered owners of the Bonds that:

                  (a) The aggregate face amount of all Prior Issues  outstanding
         as of the Date of Issuance,  the proceeds of which were or will be used
         to any extent with respect to  facilities  located in the  incorporated
         municipality  (or  unincorporated  county) in which the  Facilities are
         located and the Principal  Users of such  facilities  are the Borrower,
         any  other  Principal  User of the  Facilities  or any  Related  Person
         thereto, is $0.

                  (b) The  aggregate  face  amount of all Prior  Issues  and all
         exempt facility  bonds,  qualified  redevelopment  bonds and industrial
         development  bonds as defined in the 1954 Code or the Code  outstanding
         as of the Date of Issuance,  the proceeds of which were used by or were
         allocated to the Borrower,  any other  Principal User of the Facilities
         or any Related Person thereto as a Test-Period Beneficiary is $0.

         Section 2.4. Federal Tax Return Information.  The Facilities have a SIC
Code Number of 3721.  The  Borrower  files its federal  income tax return at the
Internal Revenue Service Center in Fresno,  California.  The Borrower's  federal
employer identification number of the Borrower is 95-4257380.

         Section 2.5.  Composite Issues.

         The  Borrower  hereby  represents  and  warrants for the benefit of the
Issuer, the Trustee and the registered owners of the Bonds that:

                  (a) During the period beginning 15 days prior to the sale date
         of the Bonds and ending 15 days  thereafter  none of the Borrower,  any
         other  Principal  User of the  Facilities or any Related Person thereto
         sold,  guaranteed,  arranged,  participated in, assisted with, borrowed
         the proceeds of, or leased  facilities  financed by obligations  issued
         under  Section  103 of the 1954 Code or Section  103 of the Code by any
         state or local governmental unit or any constituted authority empowered
         to issue obligations by or on behalf of any state or local governmental
         unit.

                  (b) During the period  commencing  on the Date of Issuance and
         ending 15 days thereafter,  there will be no obligations sold or issued
         under  Section 103 of the 1954 Code or the Code that are  guaranteed by
         the Borrower, any other Principal User of the Facilities or any Related
         Person or which are issued with the assistance or participation  of, or
         by  arrangement  with,  the Borrower,  any other  Principal User of the
         Facilities or any Related  Person  without the written  opinion of Bond
         Counsel to the effect that the  issuance of such  obligations  will not
         adversely  affect their opinion as to the  exclusion  from gross income
         for federal income tax purposes of interest with respect to the Bonds.





                                       14

<PAGE>



                  (c) Other than the Borrower,  any other  Principal User of the
         Facilities or any Related Person,  no person (or Related Person to such
         other person) has (i) guaranteed,  arranged,  participated in, assisted
         with the  issuance  of, or paid any portion of the Costs of Issuance of
         the Bonds or (ii) provided any property or any franchise,  trademark or
         trade name (within the meaning of Section 1253 of the Code) which is to
         be used in connection with the Facilities.

         Section 2.6.  Prohibited  Uses.  The  Borrower  hereby  represents  and
warrants for the benefit of the Issuer, the Trustee and the registered owners of
the Bonds that no portion of the  Proceeds of the Bonds is being used to provide
a facility, a purpose of which is retail food and beverage services,  automobile
sales or service, or the provision of recreation or entertainment. No portion of
the  proceeds of the Bonds is being used to provide  any  private or  commercial
golf course,  country club, health club,  massage parlor,  tennis club,  skating
facility  (including  roller skating,  skateboarding  and ice skating),  racquet
sports facility  (including any handball,  squash or racquetball court), hot tub
facility,  suntan  facility,  racetrack,  skybox or other luxury box,  airplane,
store the  principal  business of which is the sale of alcoholic  beverages  for
consumption off premises, or facility used primarily for gambling. No portion of
the  Proceeds  of the Bonds is being  used  directly  or  indirectly  to provide
residential real property for single- or multi-family units.

         Section 2.7. No Composite  Project.  The Borrower hereby represents and
warrants for the benefit of the Issuer, the Trustee and the registered owners of
the  Bonds  that  the  Facilities  are  a  stand-alone   Manufacturing  Facility
unconnected  to any other  facility and do not share any portion of  substantial
common  facilities with any other building (other than the  Facilities),  (b) an
enclosed shopping mall or (c) a strip of offices, stores or warehouses.

         Section 2.8.  Acquisition  of Existing  Property.  The Borrower  hereby
represents  and  warrants  for the  benefit of the  Issuer,  the Trustee and the
registered owners of the Bonds that no portion of the Proceeds of the Bonds will
be used to pay the cost of acquisition of real property  (other than land or any
interest therein) the first use of which will not be pursuant to the acquisition
with the Proceeds of the Bonds.

         Section 2.9.  Land Acquisition Limit and No Acquisition of Farmland.

         The  Borrower  hereby  represents  and  warrants for the benefit of the
Issuer, the Trustee and the registered owners of the Bonds that:

                  (a) The amount of Proceeds of the Bonds expended for land will
         not exceed $0,  which is not greater than 25 percent of the Proceeds of
         the Bonds.

                  (b) No  portion  of the  Proceeds  of the  Bonds  will be used
         directly or  indirectly  for the  acquisition  of land or any  interest
         therein to be used for the purpose of farming.





                                       15

<PAGE>



         Section 2.10.  Representations by the Borrower for Purposes of IRS Form
8038.  Section 149(e) of the Code requires as a condition to  qualification  for
tax-exemption  that the Issuer provide to the Secretary of the Treasury  certain
information  with  respect  to the Bonds  and the  application  of the  proceeds
derived therefrom. The following  representations of the Borrower will be relied
upon by the Issuer and Bond Counsel in  satisfying  this  information  reporting
requirement. Accordingly, the Borrower hereby represents, covenants and warrants
to the best of their knowledge,  for the benefit of the Issuer, Bond Counsel and
the  registered  owners of the Bonds,  the truth and accuracy of (c) through (t)
below:

         (a) Issuer's employer identification number.................68-0304653

         (b) Number of 8038 reports previously filed by the Issuer this 
             calendar year....................................................5

         (c) Issue price of the Bonds................................$8,500,000

         (d) Proceeds used for Accrued Interest............................. $0

         (e) Costs of Issuance (including Underwriter's
             Discount).................................................$170,000

         (f) Reasonably required Reserve Fund Deposits.......................$0

         (g) Proceeds used for Credit Enhancement............................$0

         (h) Proceeds used to refund prior issue............................ $0

         (i) Nonrefunding Proceeds.................................. $8,330,000

         (j) Date of final maturity of the Bonds.................August 1, 2027

         (k) Interest Rate on the final maturity of
             the Bonds..................................................... VR%

         (l) Issue price of the final maturity of
             the Bonds...............................................$8,500,000

         (m) Issue price on the entire issue of the Bonds............$8,500,000

         (n) Stated redemption price at maturity of the final maturity of
             the Bonds...............................................$8,500,000

         (o) Stated redemption price at maturity of the entire issue of
             the Bonds...............................................$8,500,000





                                       16

<PAGE>



         (p) Weighted average maturity of the entire issue
             of the Bonds.........................................  29.98 years

         (q) Yield on the entire issue of the Bonds.........................VR%

         (r)  Net interest cost for the entire issue of
              the Bonds.....................................................VR%

         (s)  The Standard Industrial Classification Code(s) for the
              Facilities is ...............................................3721

         (t)  Type of Property financed by Nonrefunding Proceeds of the Bonds:

              Land..........................................................$0

              Buildings.............................................$7,164,000

              Equipment with recovery period of more than 5 years...$1,166,000

              Equipment with recovery period of 5 years or less.............$0

              Other ........................................................$0

                  Total.............................................$8,330,000


                                   ARTICLE III

                              USE OF BOND PROCEEDS

         Section  3.1.  Anticipated  Use of Proceeds.  The  Borrower  covenants,
represents  and  warrants  for the  benefit of the  Issuer,  the Trustee and the
registered  owners of the Bonds that the  Proceeds  of the Bonds will be used in
the manner set forth in Exhibit  A-2 hereto and that the  Proceeds  of the Bonds
will be invested in accordance with the Investment Instructions.

         Section 3.2.  Certification  as to Costs of the  Project.  The Borrower
hereby  certifies,  with respect to the amounts  shown in Exhibit A-1, that such
amounts  consist only of costs which are directly  related to and  necessary for
the financing of the Project.





                                       17

<PAGE>



                                   ARTICLE IV

                                    ARBITRAGE

         Section 4.1.  Arbitrage  Representations  and Elections.  In connection
with the issuance of the Bonds,  the Borrower hereby  represents,  certifies and
warrants as follows:

                  (a) The Borrower has entered into contracts with third parties
         for the  acquisition,  construction  and  equipping  of the  Facilities
         obligating an  expenditure  in excess of 5% of the Net Sale Proceeds of
         the  Bonds  and  the  Borrower  will  proceed  with  due  diligence  in
         completing  the  Facilities  and in allocating the Net Sale Proceeds of
         the Bonds to such Expenditures.

                  (b) The Borrower will use a reasonable,  Consistently  Applied
         Accounting  Method to  account  for  Gross  Proceeds,  Investments  and
         Expenditures  for the Bonds.  The  Borrower  shall  additionally  use a
         Consistently  Applied Accounting Method for allocating  Proceeds of the
         Bonds to Expenditures, subject to the Current Outlay of Cash rule.

                  (c) The  Borrower  shall not  commingle  Proceeds of the Bonds
         with any other funds.

                  (d) In connection  with the Bonds,  there has not been created
         or  established  and the  Borrower  does not expect  that there will be
         created or established,  any sinking fund, pledged fund or similar fund
         (other than as  specifically  identified in the  Indenture),  including
         without  limitation any  arrangement  under which money,  securities or
         obligations  are pledged  directly or indirectly to secure the Bonds or
         any  contract  securing  the  Bonds or any  arrangement  providing  for
         compensating or minimum  balances to be maintained by the Borrower with
         any  owner or credit  enhancer  of the  Bonds,  except  the  Collateral
         Account.

                  (e)  The  allocation  of  Net  Proceeds  of the  Bonds  to the
         reimbursement portion of the costs of the Facilities will be made as of
         and  completed on the Date of  Issuance.  The  declaration  of official
         intent required by ss. 1.150-2 of the  Regulations  with respect to Net
         Proceeds  of the Bonds  used to  reimburse  the  Borrower  for  certain
         Capital Expenditures made in connection with the Facilities is attached
         hereto as Exhibit D.

                  (f) The Borrower  reasonably  expects that 85% of the Net Sale
         Proceeds of the Bonds will be used to complete  the  Facilities  within
         three  years  of the  Date of  Issuance  and not  more  than 50% of the
         Proceeds of the Bonds will be invested in Nonpurpose Investments having
         a substantially  guaranteed  Yield for four years or more. The Borrower
         reasonably expects that the Net Sale Proceeds of the Bonds deposited to
         the  Project  Fund will be  expended in  accordance  with the  schedule
         contained in the No




                                       18

<PAGE>



         Arbitrage   Certificate   executed  and  delivered  by  the  Issuer  in
         connection with the issuance and delivery of the Bonds.

                  (g)  All  funds  and  accounts  established  pursuant  to  the
         Indenture  will be invested  pursuant to the No  Arbitrage  Certificate
         executed  by the  Issuer  on the Date of  Issuance  and the  Investment
         Instructions  delivered  to the Issuer and the  Borrower on the Date of
         Issuance.

                  (h) The  Borrower  will not enter into and will not direct the
         Trustee to engage in any Abusive  Arbitrage  Devises.  If the  Borrower
         directs the Trustee to invest any of the Gross Proceeds in certificates
         of deposit or pursuant to an investment  contract or a  certificate  of
         deposit,   the  Borrower   will  obtain  and  provide  to  the  Trustee
         certifications in the form attached hereto as Exhibit B.

                  (i) The Borrower hereby makes,  and the Issuer hereby accepts,
         the following  elections and other choices  pursuant to the Regulations
         with respect to the Bonds:

                           (i) The  Borrower  elects the bond year stated in the
                  definition of the Bond Year.

                          (ii)  The  Borrower  elects  to  avail  itself  of all
                  unrestricted yield investments  granted in the Regulations for
                  temporary period,  reasonably  required reserve fund and minor
                  portion investments.

                         (iii)  So  long  as  the   amount  on  deposit  in  the
                  Collateral Account exceeds a reasonably  required reserve fund
                  for the Bonds  pursuant  to  Section  148(d) of the Code,  the
                  Borrower  elects to treat the last day of the first  Bond Year
                  (July 31, 1998) as the initial  Installment  Computation  Date
                  and  the  Borrower  elects  to  treat  the  last  day of  each
                  subsequent  Bond Year as  subsequent  Installment  Computation
                  Dates.  Commencing  with the Bond Year following the Bond Year
                  in which the amount on deposit in the Collateral  Account does
                  not exceed a  reasonably  required  reserve fund for the Bonds
                  pursuant to Section 148(d) of the Code, the Borrower elects to
                  treat the last day of the fifth  Bond Year as the  Installment
                  Computation Date and the Borrower elects to treat the last day
                  of each  subsequent  fifth Bond Year  thereafter as subsequent
                  Installment  Computation  Dates.  The Borrower elects to treat
                  the last day of the  fifth  Bond  Year as the  initial  rebate
                  payment  date  and  the  last  day of  each  fifth  Bond  Year
                  thereafter as subsequent  rebate payment  dates.  The Borrower
                  may  change  or  adjust  such  dates  as   permitted   by  the
                  Regulations.

                          (iv) With respect to the  Universal  Cap, the Borrower
                  as of the Date of Issuance  does not expect that the operation
                  of  the   Universal   Cap  will  result  in  a  reduction   or
                  reallocation  of  Gross  Proceeds  of the  Bonds  and that the
                  Borrower (A) does not expect to pledge funds (other than those
                  described in the Indenture)




                                       19

<PAGE>



                  to the  payment  of the  Bonds;  (B)  expects  to expend  Sale
                  Proceeds of the Bonds within the expected  temporary  periods;
                  and (C) does not  expect  to retire  any of the Bonds  earlier
                  than shown in the Yield computations for the Bonds pursuant to
                  this Article IV.

         Section  4.2.  Arbitrage  Compliance.   The  Borrower  and  the  Issuer
acknowledge  that the  continued  exclusion  of interest on the Bonds from gross
income of the  recipients  thereof  for  purposes  of  federal  income  taxation
depends, in part, upon compliance with the arbitrage  limitations imposed by ss.
148 of the Code,  including  the rebate  requirement  described  in Section  4.3
below. The Borrower and the Issuer hereby agree and covenant that they shall not
permit at any time or times any of the  Proceeds  of the Bonds or other funds of
the  Borrower  to be used,  directly  or  indirectly,  to  acquire  any asset or
obligation,  the  acquisition  of which would  cause the Bonds to be  "arbitrage
bonds" for  purposes of ss. 148 of the Code.  The  Borrower  further  agrees and
covenants  that it  shall,  to the  extent  that any  Proceeds  of the Bonds are
invested in any Investment  which is not Investment  Securities,  do and perform
all acts and things  necessary in order to ensure that the  requirements  of ss.
148 of the Code and the  Regulations are met. To the extent that Proceeds of the
Bonds are invested in any  Investment  which is not Investment  Securities,  the
Borrower  shall  retain,  at its own  expense,  a Rebate  Analyst  to make  such
determinations  and calculations as may be necessary in order to ensure that the
Borrower  takes the actions  described  in Sections  4.2 through 4.6 hereof with
respect to the Investment of Gross Proceeds on deposit in the funds and accounts
established  under the Indenture.  If the Borrower fails to retain such a Rebate
Analyst,  the Issuer shall,  upon being notified in writing of such failure,  at
the Borrower's expense,  retain such a Rebate Analyst. The Borrower shall direct
the  Trustee  to make the  required  transfers  and  dispositions  described  in
Sections  4.2,  4.3 and 4.4 hereof,  and the  Trustee may rely upon  information
provided by the Borrower.

         Section 4.3.  Calculation of Rebate Amount.

                  (a)ss.  148(f) of the Code  requires the payment to the United
         States of the Rebate  Amount.  Except as  provided  below,  the Revenue
         Fund, the Project Fund, the Rebate Fund, the Collateral Account and all
         other funds or  accounts  treated as  containing  Gross  Proceeds,  are
         subject to this rebate requirement.

                  (b)In accordance with the requirements set out in the Code and
         pursuant to the  Indenture,  the Issuer has created the Rebate Fund, to
         be held by the Trustee, in its capacity as Trustee under the Indenture,
         and used as provided in this Section.

                            (i) On or before 25 days following each  Computation
                  Date, upon the Borrower's written  direction,  an amount shall
                  be  deposited to the Rebate Fund by the Trustee from source or
                  sources  stated in such  direction  so that the balance of the
                  Rebate Fund shall equal the aggregate Rebate Amount as of such
                  determination date.





                                       20

<PAGE>



                           (ii)  Amounts  deposited  in the Rebate Fund shall be
                  invested in accordance with the Investment Instructions by the
                  Trustee at the written direction of the Borrower.

                          (iii) All money at any time  deposited  in the  Rebate
                  Fund shall be held by the Trustee,  to the extent  required by
                  this Tax Regulatory  Agreement and the Indenture,  for payment
                  to the United  States of America  of the  Rebate  Amount.  All
                  amounts  deposited into or on deposit in the Rebate Fund shall
                  be governed by this Tax Regulatory Agreement.

                           (iv) For purposes of crediting  amounts to the Rebate
                  Fund or withdrawing  amounts from the Rebate Fund,  Nonpurpose
                  Investments  shall be valued in the  manner  provided  in this
                  Article.

                  (c) In order to meet the rebate  requirement  of ss. 148(f) of
         the Code,  the Borrower  agrees and  covenants to take,  or cause to be
         taken by the  Trustee or the Rebate  Analyst  described  in Section 4.6
         hereof, as appropriate, the following actions:

                            (i) For each Investment of amounts held with respect
                   to the Bonds in (A) the Revenue Fund,  (B) the Purchase Fund,
                   (C) the  Project  Fund and (D) the Rebate  Fund,  the Trustee
                   shall  record  the  purchase  date  of such  Investment,  its
                   purchase  price,  accrued  interest due on its purchase date,
                   its face amount, its coupon rate, its Yield, the frequency of
                   its interest payment, its disposition price, accrued interest
                   due on its  disposition  date and its  disposition  date. The
                   Rebate Analyst  retained by the Borrower shall  determine the
                   Fair Market Value for such  Investments and the Yield thereon
                   as may be  required  by the  Regulations.  The  Yield  for an
                   Investment  shall be calculated by using the method set forth
                   in the Regulations.

                           (ii) For each Computation Date specified in paragraph
                   (iii) below,  the Rebate  Analyst  shall compute the Yield on
                   the  Bonds  as  required  by  the  Regulations  based  on the
                   definition of issue price  contained in Section 148(h) of the
                   Code and the Regulations. The Bonds are a variable rate issue
                   and  accordingly  the yield on the Bonds cannot be determined
                   at this time.  The Yield on the Bonds shall be  calculated by
                   the Rebate  Analyst at such time in order to comply with this
                   Tax  Regulatory  Agreement and the  Regulations  based on the
                   definitions of issue price contained in Section 148(h) of the
                   Code using  payments  or  prepayments  of the  principal  of,
                   premium,  if any, and  interest on the Bonds  required by the
                   Regulations.  For purposes of this Tax  Regulatory  Agreement
                   the initial  offering price to the public (not including bond
                   houses  and  brokers,  or similar  persons  or  organizations
                   acting in the capacity of  underwriters  or  wholesalers)  at
                   which a  substantial  amount  of the  Bonds  were sold is the
                   Issue  Price.   Any   reasonable   amounts  paid  for  credit
                   enhancement have been and may




                                       21

<PAGE>



                   generally be treated as interest on the Bonds for purposes of
                   Yield computation to the extent permitted by the Regulations.

                          (iii)  Subject  to the  special  rules  set  forth  in
                   paragraphs  (iv) and (v)  below,  the  Rebate  Analyst  shall
                   determine the amount of earnings  received on all  Nonpurpose
                   Investments  described  in  paragraph  (i)  above,  for  each
                   Computation Date. In addition,  where Nonpurpose  Investments
                   are retained by the Trustee  after  retirement  of the Bonds,
                   any  unrealized  gains or losses as of the date of retirement
                   of the Bonds must be taken into  account in  calculating  the
                   earnings  on  such  Nonpurpose   Investments  to  the  extent
                   required by the Regulations.

                           (iv)  In  determining   the  Rebate  Amount  computed
                   pursuant to this  Section,  (A) all earnings on any bona fide
                   debt  service  fund  (including  the  Revenue  Fund  and  the
                   Purchase  Fund) shall not be taken into  account for any Bond
                   Year during which the gross earnings of such funds total less
                   than $100,000,  (B) the Universal Cap applicable to the Bonds
                   pursuant to ss. 1.148-  6(b)(2) of the  Regulations  shall be
                   taken into account,  (C) all of the Borrower's  elections and
                   other  choices set forth in Section 4.1 hereof shall be taken
                   into account and (D) all spending exceptions to rebate met by
                   the Borrower shall be taken into account.

                            (v) For each Computation Date specified in paragraph
                   (iii) above,  the Rebate  Analyst  shall  calculate  for each
                   Investment  described in paragraphs  (i) and (iii) above,  an
                   amount equal to the earnings  which would have been  received
                   on such  Investment at an interest rate equal to the Yield on
                   the Bonds as described in paragraph (ii) above. The method of
                   calculation shall follow that set forth in the Regulations.

                           (vi) For each  Computation  Date,  the Rebate Analyst
                   shall  determine  the  amount  of  earnings  received  on all
                   Investments held in the Rebate Fund for the Computation Date.
                   The method of calculation  shall follow that set forth in the
                   Regulations.

                          (vii) For each  Computation  Date,  the Rebate Analyst
                   shall calculate the Rebate Amount, by any appropriate  method
                   to be described  in the Code and  Regulations  applicable  or
                   which becomes  applicable to the Bonds. The  determination of
                   the Rebate Amount shall account for the amount (to be rounded
                   down to the nearest multiple of $100) equal to the sum of all
                   amounts determined in paragraph (iii), all amounts determined
                   in  paragraphs  (v) and (vi),  and less any amount  which has
                   previously been paid to the United States pursuant to Section
                   4.4 below. The Rebate Analyst shall notify the Trustee of the
                   Rebate Amount.





                                       22

<PAGE>



                         (viii)  If the  Rebate  Amount  exceeds  the  amount on
                   deposit in the Rebate Fund,  the Borrower  shall  immediately
                   pay such amount to the  Trustee  for deposit  into the Rebate
                   Fund.






                                       23

<PAGE>



         Section 4.4.  Payment to United States.

                  (a) Not later  than sixty (60) days after the last day of each
         fifth  Bond  Year (or such  longer  period as may be  permitted  by the
         Regulations),  the  Trustee  shall pay to the  United  States an amount
         that, when added to the Future Value as of the most recent  Computation
         Date of previous  rebate  payments made for the Bonds,  equals at least
         ninety percent (90%) of the Rebate Amount  required to be on deposit in
         the Rebate Fund as of such payment  date. No later than sixty (60) days
         after the Final  Computation  Date the Trustee  shall pay to the United
         States  an  amount  that,  when  added to the  Future  Value as of such
         Computation Date of previous rebate payments made for the Bonds, equals
         at least one hundred  percent  (100%) of the balance  remaining  in the
         Rebate Fund.

                  (b) The Trustee shall mail each payment of an  installment  to
         the Internal Revenue Service Center, Philadelphia,  Pennsylvania 19255.
         Each payment shall be accompanied by Internal Revenue Form 8038-T, and,
         if necessary,  a statement  summarizing the determination of the Rebate
         Amount.

                  (c) If on any Computation Date, the aggregate amount earned on
         Nonpurpose  Investments  in which the Gross  Proceeds  of the Bonds are
         invested  is less than the amount  that  would have been  earned if the
         obligations had been invested at a rate equal to the Yield on the Bonds
         as determined  in Section 4.3, such deficit may at the written  request
         of the  Borrower  be  withdrawn  from the  Rebate  Fund and paid to the
         Borrower or as the Borrower shall direct.  The Borrower may direct that
         any  overpayment  of rebate may be  recovered  from any  Rebate  Amount
         previously paid to the United States pursuant to ss.  1.148-3(i) of the
         Regulations.

                  (d) The  Borrower  shall also pay any  penalty or  interest on
         underpayments  of Rebate Amount not paid in a timely manner pursuant to
         this Tax Regulatory Agreement, the Code and the Regulations.

         Section 4.5. Recordkeeping.  In connection with the rebate requirement,
the Borrower and the Trustee shall maintain the following records:

                  (a) The Borrower and the Trustee shall record all amounts paid
         to the United States pursuant to Section 4.4 hereof.  The Trustee shall
         furnish to the Issuer and the Borrower  copies of any  materials  filed
         with the Internal Revenue Service  pertaining thereto and shall provide
         the Issuer and the Borrower with all records in its possession that the
         Issuer,  the Borrower or the Rebate Analyst may request relating to the
         calculation of any Rebate Amount.

                  (b) The Borrower and the Trustee  shall retain  records of the
         rebate  calculations  until six years after the  retirement of the last
         obligation of the Bonds.






                                       24

<PAGE>



         Section 4.6.  Rebate Analyst.

                  (a) To the extent  required to comply with the  provisions  of
         Section 4.2 hereof, the Borrower shall appoint a Rebate Analyst and any
         successor  Rebate  Analyst for the Bonds  reasonably  acceptable to the
         Issuer, subject to the conditions set forth in this Section. The Rebate
         Analyst and each successor  Rebate Analyst shall signify its acceptance
         of the duties  imposed  upon it hereunder  by a written  instrument  of
         acceptance  delivered to the Trustee, the Issuer and the Borrower under
         which such Rebate  Analyst will agree to discharge its duties  pursuant
         to this Tax Regulatory  Agreement in a manner  consistent  with prudent
         industry practice.

                  (b)  The  Rebate  Analyst  may  at  any  time  resign  and  be
         discharged of the duties and obligations created by this Tax Regulatory
         Agreement by giving notice to the Trustee, the Issuer and the Borrower.
         The Rebate  Analyst may be removed at any time by an instrument  signed
         by the Issuer and the Borrower and filed with the Issuer,  the Borrower
         and  the  Trustee.   The  Borrower  and  the  Issuer  shall,  upon  the
         resignation  or  removal  of the Rebate  Analyst,  appoint a  successor
         Rebate Analyst.

                  (c) Each successor Rebate Analyst  appointed  pursuant to this
         Section  shall be  either  a firm of  independent  accountants  or Bond
         Counsel or another entity  experienced in calculating  rebate  payments
         required by ss. 148(f) of the Code.

                  (d) In order to provide for the  administration of the matters
         pertaining to arbitrage rebate  calculations  set forth herein,  and in
         the Investment Instructions and No Arbitrage Certificate,  the Trustee,
         the  Borrower  and the Issuer may  provide  for the  employment  of the
         Rebate Analyst on or prior to July 31, 2002. The Trustee and the Issuer
         may rely  conclusively  upon and  shall  be  fully  protected  from all
         liability in relying upon the opinions,  calculations,  determinations,
         directions and advice of the Rebate  Analyst.  The charges and fees for
         such Rebate Analyst shall be paid by the Borrower upon  presentation of
         an invoice for services rendered in connection therewith.

                                    ARTICLE V

                              COMPLIANCE WITH CODE

         In order to ensure that  interest on the Bonds is  excludable  from the
gross income of the recipients  thereof for purposes of federal income taxation,
the Borrower hereby represents and covenants as follows:

                  (a) The Average  Maturity of the Bonds does not exceed 120% of
         the Average  Economic Life of the Facilities  within the meaning of ss.
         147(b) of the Code as set forth in Exhibit C hereto.





                                       25

<PAGE>



                  (b) The  Bonds  are not  and  shall  not  become  directly  or
         indirectly "federally  guaranteed." Unless otherwise excepted under ss.
         149(b) of the Code, the Bonds will be considered "federally guaranteed"
         if (i) the payment of principal  and interest with respect to the Bonds
         is guaranteed (in whole or in part) by the United States (or any agency
         or  instrumentality  thereof),  (ii)  five (5)  percent  or more of the
         Proceeds of the Bonds is (A) to be used in making loans, the payment of
         principal or interest  with respect to which are to be  guaranteed  (in
         whole  or  in  part)  by  the   United   States   (or  any   agency  or
         instrumentality thereof) or (B) to be invested (directly or indirectly)
         in  federally  insured  deposits  or  accounts  or (iii) the payment of
         principal or interest on the Bonds is otherwise  indirectly  guaranteed
         (in  whole  or in  part)  by  the  United  States  (or  any  agency  or
         instrumentality thereof).

                  (c) The Borrower  will  provide to the Issuer all  information
         necessary  to enable the Issuer to complete and file  Internal  Revenue
         Forms 8038 and 8038-T pursuant to ss. 149(e) of the Code.

                  (d) As required by ss.  147(f) of the Code,  the Bonds and the
         Project  were the subject of a public  hearing  held on June 18,  1997,
         which was preceded by reasonable public notice.

                  (e) The  Borrower  will  comply  with,  and make  all  filings
         required by, all effective rules, rulings or regulations promulgated by
         the  Department  of the  Treasury  or IRS with  respect to  obligations
         described in ss.ss. 103 and 144 of the Code, such as the Bonds.

                  (f) The Borrower  agrees to rebate all amounts  required to be
         rebated to the United  States of America  pursuant to ss. 148(f) of the
         Code. The Borrower  agrees to provide any  instructions  to the Trustee
         that are  necessary to satisfy the  requirements  of ss.  148(f) of the
         Code.  The Borrower will not deposit or instruct the Trustee to deposit
         amounts in the Rebate Fund in excess of the amounts reasonably expected
         to be needed to make the  payments to the United  States as required by
         ss. 148(f) of the Code.

                  (g) The Sale Proceeds of the Bonds and any Investment Proceeds
         will be expended for the purposes set forth in the Agreement and in the
         Indenture  and no amount of such  Proceeds of the Bonds in excess of 2%
         of the Sale  Proceeds of the Bonds will be expended to pay the costs of
         issuing the Bonds within the meaning of ss. 147(g) of the Code.

                  (h) The Issuer shall not sell any other tax-exempt obligations
         within 15 days of the sale date of the Bonds  pursuant to the same plan
         of  financing  with the Bonds and payable from  substantially  the same
         source of funds, determined without regard to qualified guaranties from
         unrelated parties and used to pay the Bonds.

                  (i) The Bonds were  approved  by the  Governor of the State of
         California following the public hearings referred to in (d) above.




                                       26

<PAGE>




                                   ARTICLE VI

                        TERM OF TAX REGULATORY AGREEMENT

         This  Tax  Regulatory  Agreement  shall be  effective  from the Date of
Issuance  through the date that the last Bond is  redeemed,  paid or deemed paid
pursuant to the terms of the Indenture,  except that the requirements of Section
4.5 shall survive until six years after the  retirement of the last  obligations
of the Bonds.

                                   ARTICLE VII

                                   AMENDMENTS

         Notwithstanding  any other provision hereof,  any provision of this Tax
Regulatory Agreement may be deleted or modified at any time at the option of the
Borrower,  with the consent of the Issuer,  if the  Borrower has provided to the
Trustee and the Issuer an opinion,  in form and  substance  satisfactory  to the
Trustee and the Issuer,  of Bond Counsel that such deletion or modification will
not  adversely  affect the  exclusion  of  interest  on the Bonds from the gross
income of the recipients thereof for purposes of federal income taxation.

                                  ARTICLE VIII

                           EVENTS OF DEFAULT, REMEDIES

         Section  8.1.  Events of Default.  The failure of any party to this Tax
Regulatory  Agreement to perform any of its required  duties under any provision
hereof shall constitute an Event of Default under this Tax Regulatory  Agreement
and under the Indenture.

         Section 8.2. Remedies for an Event of Default. Upon an occurrence of an
Event of Default  under  Section  8.1  hereof,  the Issuer or the Trustee may in
their discretion,  proceed to protect and enforce their rights and the rights of
the  registered  owners of the Bonds by pursuing any available  remedy under the
Indenture or by pursuing any other available remedy,  including, but not limited
to, a suit at law or in equity.




                                       27

<PAGE>



         IN WITNESS  WHEREOF,  the Issuer,  the  Borrower  and the Trustee  have
caused this Tax Regulatory  Agreement to be executed in their  respective  names
and by their proper officers  thereunto duly  authorized,  all as of the day and
year first written above.

                               CALIFORNIA ECONOMIC DEVELOPMENT
                               FINANCING AUTHORITY


                               By___________________________________________
                                   Chair

Attest:


By_____________________________________
   Secretary


                                ADVANCED AERODYNAMICS AND
                                STRUCTURES, INC.


                                By__________________________________________
                                     Authorized Signatory




                                FIRST TRUST OF CALIFORNIA,
                                NATIONAL ASSOCIATION, AS TRUSTEE


                                By__________________________________________
                                    Authorized Officer







<PAGE>



                                   EXHIBIT A-1


                            SOURCES AND USES OF FUNDS


         1. Amount  received  from the sale of the Bonds  (exclusive  of accrued
interest) is as follows:

         Face amount of the Bonds....................................$8,500,000
         Less:  Underwriters' discount..................................$-0-
         Total amount received from the sale of the Bonds............$8,500,000

         2. Proceeds of the Bonds totaling $8,330,000,  representing 100% of the
Net Sale  Proceeds of the Bonds after  deduction  of the amounts  described in 3
below will be deposited to the Project Fund.

         3.  $170,000 of the Bond  proceeds  will be  deposited  in the Costs of
Issuance Fund to pay a portion of the Costs of Issuance of the Bonds.


                       Estimated Use of Substantially all
                             of the Proceeds of the
                                      Bonds

(1)      Issue price of Bonds........................................$8,500,000
(2)      Substantially All Factor.......................................... .95
(3)                        Total.....................................$8,075,000
                                                                      =========
(4)      Amount paid for qualified Project Costs*
            (including interest during construction, if any)........ $8,330,000

         Note:  All  investment  earnings,  if any, on the Bond proceeds will be
used for qualified  Project Costs (including  interest during  construction,  if
any).



*Qualified Project Costs:

         Building                                                    $7,164,000
         Equipment                                                    1,166,000





                                       A-1

<PAGE>



                                   EXHIBIT A-2


                  Property Financed or Refinanced by the Bonds



1.       Construction and installation of a manufacturing facility consisting of
         approximately 200,000 square feet - $7,164,000.

2.       Acquisition and installation of manufacturing equipment - $1,166,000.


Total             $8,330,000.


























                                       A-2

<PAGE>



                                   EXHIBIT B-1


                    FORM OF DEALER CERTIFICATION OF BONA FIDE
                      BID PRICE OF A CERTIFICATE OF DEPOSIT


         I, [Name],  [Position]  of [Entity  Providing the  Certification]  (the
"Dealer") HEREBY CERTIFY that the Dealer maintains an active secondary market in
certificates of deposit of a type similar to that [sold/purchased] by the Dealer
on behalf of Advanced Aerodynamics and Structures,  Inc., a Delaware corporation
(the  "Borrower"),  and that the price at which the  certificate  of deposit was
[sold  to/purchased  from] the Borrower is the bona fide bid price quoted by the
Dealer  in  an  active  secondary  market  maintained  by  the  Dealer  in  such
certificates of deposit.

         IN  WITNESS  WHEREOF,  I have  hereunto  set my hand this  _____ day of
_______________, 19__.



                                   By_________________________________________
                                   Title:_____________________________________


                                      B-1-1

<PAGE>



                                   EXHIBIT B-2


                       FORM OF DEALER CERTIFICATION FOR A
                        CERTIFICATE OF DEPOSIT FOR WHICH
                        NO ACTIVE SECONDARY MARKET EXISTS


         I, [Name], [Position], of [Entity Providing Certificate] (the "Dealer")
HEREBY  CERTIFY  that there is no active  secondary  market in  certificates  of
deposit of the type [sold/  purchased]  on behalf of Advanced  Aerodynamics  and
Structures,  Inc., a Delaware corporation [to/from] the Dealer (the "Certificate
of Deposit");  that the yield on the Certificate of Deposit is as high or higher
than the yield on comparable  obligations  traded on an active secondary market,
and as high or higher than the yield available on reasonably  comparable  direct
obligations offered by the United States Treasury;  that the Dealer maintains an
active  secondary  market in comparable  certificates of deposit,  and that this
Certification is based on actual trades adjusted to reflect the size and term of
the  Certificate  of Deposit  and the  stability  and  reputation  of the person
issuing it.

         IN  WITNESS  WHEREOF,  I have  hereunto  set my  hand  this  _____  day
_________ of 19__.


                                           By__________________________________
                                           Title:______________________________





                                      B-2-1

<PAGE>



                                   EXHIBIT B-3


                         FORM OF PROVIDER CERTIFICATION
                          FOR A CERTIFICATE OF DEPOSIT


     I, [Name], [Position], of [Entity Providing the Certificate of Deposit]
(the  "Provider")  HEREBY  CERTIFY that the yield on the  Certificate of Deposit
entered  into on [DATE] is not less than the  highest  yield  that the  Provider
publishes or posts for comparable  certificates of deposit offered to the public
and that the  yield on the  Certificate  of  Deposit  is not less than the yield
available on  reasonably  comparable  direct  obligations  offered by the United
States Treasury.

         IN  WITNESS  WHEREOF,  I have  hereunto  set my hand  this  ____ day of
_________________, 19__.


                                        By_____________________________________
                                        Title:_________________________________








                                      B-3-1

<PAGE>



                                   EXHIBIT B-4


                         FORM OF PROVIDER CERTIFICATION
                           FOR AN INVESTMENT CONTRACT


         I, [Name],  [Position],  of [Entity Providing Investment Contract] (the
"Provider")  HEREBY CERTIFY in connection with the Investment  Contract  between
[NAME] and the Provider dated as of [DATE] (the "Investment  Contract") that the
yield on the  Investment  Contract  is at least  equal to the yield  offered  on
reasonably  comparable  Investment  contracts offered to other persons,  if any,
from a source of funds other than gross proceeds of an issue of tax-exempt bonds
and that the amount of administrative  costs that are reasonably  expected to be
paid by the Provider to third parties in connection with the Investment Contract
is $ . For  purposes of this  certification,  administrative  costs  include all
brokerage  or  selling  commissions  paid by the  Provider  to third  parties in
connection with the Investment  Contract,  legal or accounting fees,  investment
advisory fees,  recordkeeping,  safekeeping,  custody and other similar costs or
expenses.

         IN  WITNESS  WHEREOF,  I have  hereunto  set my  hand  this  _____  day
_____________ of 19__.

 
                                    By_________________________________________
                                    Title:_____________________________________






                                      B-4-1

<PAGE>



                                   EXHIBIT B-5


                     FORM OF BORROWER'S CERTIFICATION FOR A
                   CERTIFICATE OF DEPOSIT INVOLVING THREE BIDS


         I, [[Name],  [Position], of Advanced Aerodynamics and Structures, Inc.,
a Delaware  corporation (the "Borrower"),  HEREBY CERTIFY in connection with the
certificates of deposit of the type purchased by the Borrower that such purchase
was made pursuant to the Indenture of Trust, dated as of August 1, 1997, between
California  Economic  Development  Financing  Authority  and the First  Trust of
California,  National  Association after receipt of at least three bids and that
the  certificates  of  deposit  were  purchased  from the  highest  bidder in an
arm's-length transaction without regard to yield.

         IN  WITNESS  WHEREOF,  I have  hereunto  set my hand this  _____ day of
_______________, 19__.

 
                                ADVANCED AERODYNAMICS AND
                                STRUCTURES, INC.



                                By
                                Title:






                                      B-5-1

<PAGE>



                                   EXHIBIT B-6


                     FORM OF BORROWER'S CERTIFICATION FOR AN
                    INVESTMENT CONTRACT INVOLVING THREE BIDS


         I, [[Name],  [Position], of Advanced Aerodynamics and Structures, Inc.,
a Delaware  corporation (the "Borrower"),  HEREBY CERTIFY in connection with the
Investment  contract  between  the  Borrower  and [Entity  Providing  Investment
Contract] (the "Provider") dated as of
                  , (the "Investment  Contract") that (i) at least three bids on
the  Investment  Contract  were  received  from persons  other than those with a
material financial  advantage in the California Economic  Development  Financing
Authority Variable Rate Demand Industrial Development Revenue Bonds, Series 1997
(Advanced  Aerodynamics  and Structures,  Inc.  Project),  (ii) the yield on the
Investment  Contract  purchased is at least equal to the yield offered under the
highest  bid  received  from an  uninterested  party,  (iii)  the  price  of the
Investment  Contract  takes into account as a significant  factor the Borrower's
expected  drawdown  for the funds to be  invested  (other  than  float  funds or
reasonably  required  reserve  or  replacement  funds)  and (iv) any  collateral
security requirements for the Investment Contract are reasonable.

         IN WITNESS  WHEREOF,  I have  hereunto  set my hand this _______ day of
_________________, 19__.


                                ADVANCED AERODYNAMICS AND
                                STRUCTURES, INC.



                                By
                                Title:






                                      B-6-1

<PAGE>



                                    EXHIBIT C


         Useful Life of the Property Financed or Refinanced by the Bonds




                            Cost                 Useful Life*

Land                $           0       x        n/a
Building                7,164,000       x        41                $293,724,000
Equipment               1,166,000       x        10                  12,826,000

                       $8,330,000                                  $306,550,000

 less:  cost of land            0

                       $8,330,000


Average life of Project = $306,550,000 / 8,330,000 = 36.80 years.

Useful life of Project for purposes of Section 147 (b) of the Code =

                  36.80 years x 1.20 = 44.16 years

Average life of Bonds = 29.98 years


         The  information  contained  in this  schedule,  attached as an exhibit
hereto,  setting forth the respective cost, economic life, ADR midpoint life, if
any, under Revenue  Procedure  87-56,  1987-42 I.R.B.  4, and Revenue  Procedure
83-35,  1983-2 C.B.  745, as  supplemented  and amended  from time to time,  and
guideline  life, if any,  under  Revenue  Procedure  62-21,  1962-2 C.B. 118, as
supplemented  and  amended  from time to time,  of each asset of the  Facilities
financed with the Proceeds of the Bonds, is true, accurate and complete.

* Includes time from date of issuance until property is placed in service.




                                       C-1

<PAGE>


                                    EXHIBIT D


                         Declaration of Official Intent


                                 [See Attached]




                                       D-1



                     CUSTODY, PLEDGE AND SECURITY AGREEMENT


     CUSTODY,  PLEDGE  AND  SECURITY  AGREEMENT  dated as of  August  1, 1997 is
entered  into  among  ADVANCED  AERODYNAMICS  AND  STRUCTURES,  INC.,  a limited
partnership  organized under the laws of the State of Delaware (the  "Company'),
THE SUMITOMO BANK,  LIMITED, a banking  corporation  organized under the laws of
Japan,  acting through its Los Angeles Branch  ("Sumitomo"),  and FIRST TRUST OF
CALIFORNIA,  NATIONAL ASSOCIATION,  as custodian (the "Custodian"),  pursuant to
the  Reimbursement  Agreement dated as of August 1, 1997 between the Company and
Sumitomo  (hereinafter,  as the  same  may  from  time  to time  be  amended  or
supplemented, called the "Reimbursement Agreement"):

                                    RECITALS


     1. On  August  5,  1997,  the  California  Economic  Development  Financing
Authority (the "Issuer") issued its Variable Rate Demand Industrial  Development
Revenue Bonds, Series 1997 (Advanced Aerodynamics and Structures,  Inc. Project)
(the  "Bonds")  pursuant to an Indenture of Trust dated as of August 1, 1997 (as
amended or supplemented  from time to time, the "Indenture")  between the Issuer
and First Trust of California,  National Association,  as trustee (together with
any successor trustee under the Indenture, the "Trustee").

     2. The  Indenture  requires  that the Bonds be  purchased  from the  owners
thereof on the dates on which the Bonds are  subject to  optional  or  mandatory
tender  pursuant to Sections  4.06 and 4.07 of the  Indenture  (any such date is
referred to herein as the "Tender  Date") under the  circumstances  set forth in
the Indenture.

     3. The Company  has agreed to enter into the  Reimbursement  Agreement  and
thereby cause Sumitomo to issue its transferable  irrevocable  direct pay letter
of credit (the "Letter of Credit")  which may be drawn upon,  inter alia, to pay
the purchase price of Bonds which are subject to optional or mandatory tender on
such Tender Dates.

     4. Bonds tendered or deemed to have been tendered pursuant to the Indenture
which are  purchased by a draw on the Letter of Credit will be registered in the
name of  Sumitomo  or its  nominee  pursuant  to this  Pledge  Agreement  unless
Sumitomo directs otherwise.

     5. It is a  condition  precedent  to  Sumitomo's  delivery of the Letter of
Credit that the Company enter into this Custody,  Pledge and Security  Agreement
(as amended or  supplemented  from time to time, this "Pledge  Agreement")  with
Sumitomo and the Custodian.

     6. First Trust of California,  National  Association  has been appointed as
the Trustee under the Indenture and has also agreed to act as a custodian  under
this Pledge Agreement.


     NOW,  THEREFORE,  in  consideration  of the premises and in order to induce
Sumitomo to

                                        1

<PAGE>



enter into the Reimbursement Agreement and issue the Letter of Credit thereunder
and for other good and valuable  consideration,  the receipt and  sufficiency of
which is hereby acknowledged, the parties hereto agree as follows:

     1. Defined Terms.  Unless  otherwise  defined herein,  terms defined in the
Reimbursement  Agreement or the indenture shall have such defined  meanings when
used herein.

     2. Pledge. The Company hereby pledges, assigns, hypothecates, transfers and
delivers to Sumitomo all its right,  title and interest in and to all Bonds,  as
the  same  may be from  time to time  delivered  to the  Trustee  by the  owners
thereof,  that may be purchased with funds drawn under the Letter of Credit (the
"Pledged  Bonds"),  and hereby  grants to Sumitomo a first lien on, and security
interest in, all rights, title and interest of the Company in and to the Pledged
Bonds, the interest thereon and all proceeds thereof, as collateral security for
the prompt and complete  payment  when due of all amounts due to Sumitomo  under
the Reimbursement  Agreement and the performance of all other obligations of the
Company under the Reimbursement Agreement and the other Credit Documents (all of
the foregoing being hereinafter called the "Obligations").

     3. Custody and Registration of Bonds: Fees of Custodian.

          (a) Sumitomo hereby designates and appoints the Custodian as its agent
and bailee to perfect Sumitomo's pledge, assignment and security interest in the
Pledged Bonds and to serve in accordance  with the terms and  conditions of this
Pledge  Agreement as  custodial  agent of Sumitomo  for the Pledged  Bonds,  the
interest thereon and all proceeds thereof.  Upon any drawing under the Letter of
Credit for the  purchase  price of the Bonds,  the Trustee.  shall  deliver such
Pledged  Bonds  to  the  Custodian,   and  the  Custodian  hereby  accepts  such
appointment  and agrees to perform as  custodial  agent for Sumitomo and to hold
Pledged  Bonds on behalf of Sumitomo in accordance  with the  provisions of this
Pledge  Agreement.  Upon receipt of such Bonds,  the Custodian  shall notify the
Remarketing   Agent  and  the  Company  (by   telecopier  or  other   electronic
communication)   that  Bonds  equal  to  the  portion  of  the  purchase   price
attributable to principal are being held by the Custodian for Sumitomo  pursuant
to this Pledge Agreement.

          (b)  Unless  otherwise  directed  by  Sumitomo  (but  subject  to  the
provisions  of Section 11 hereof),  the  Custodian  shall  cause  either (A) any
Pledged Bonds which have not been  remarketed in accordance with the Remarketing
Agreement to be registered by the Trustee in the name of Sumitomo or its nominee
or (B) if DTC is the registered owner of all Bonds, any Pledged Bonds which have
not  been  remarketed  in  accordance  with  the  Remarketing  Agreement  to  be
registered  in the  name of DTC  with  Sumitomo's  or its  nominee's  beneficial
ownership  interest of such  Pledged  Bonds  recorded  by DTC on its books.  The
Company  hereby agrees that it will execute and deliver such  documents and take
such steps as Sumitomo may  reasonably  request in order to perfect and maintain
perfected Sumitomo's security interest in the Collateral.

                                        2

<PAGE>




          (c) The Company irrevocably  constitutes and appoints the Custodian as
its  attorney to cause the  transfer of any Pledged  Bonds on the books kept for
the  registration  thereof and authorizes the Custodian to deliver Pledged Bonds
to the Trustee for  reregistration,  if appropriate,  and delivery in accordance
with the terms of this Pledge Agreement.

          (d) The fees of the Custodian,  if any, in connection with this Pledge
Agreement shall be for the account of the Company.

     4. Payments on the Bonds: Voting Rights.

          (a) If, while this Pledge  Agreement is in effect,  the Company  shall
become  entitled to receive or shall  receive any  payment,  including,  without
limitation, any payment of principal,  premium, interest or proceeds of sale, in
respect of the  Pledged  Bonds,  such  payment  shall be subject to this  Pledge
Agreement.  Any such payment  shall be made  directly to  Sumitomo,  and, in the
event any such payment is received by the Company,  the Company agrees to accept
the same as  Sumitomo's  agent,  to hold the same in trust on behalf of Sumitomo
and to  deliver  the same  forthwith  to  Sumitomo.  AU sums of money so paid in
respect of the  Pledged  Bonds  which are  received  by the  Company and paid to
Sumitomo  and all such amounts  which shall be paid  directly to Sumitomo by the
Trustee  shall be  credited  against  the  Obligations  of the  Company  owed to
Sumitomo.  If the  payments  are in  excess  of the  amounts  owed to  Sumitomo,
Sumitomo shall return the excess to the Company.

          (b) During such time as Bonds are pledged to Sumitomo  under the terms
of this Pledge  Agreement,  Sumitomo  shall be  entitled to exercise  all of the
rights of an owner of Bonds with respect to voting, consenting and directing the
Trustee as if  Sumitomo  were the owner of such Bonds,  and the  Company  hereby
grants and assign to Sumitomo all such rights.

     5. Collateral. The Pledged Bonds, all income therefrom and proceeds thereof
are herein collectively sometimes called the "Collateral."

     6. Release of the Bonds.

          (a)  Simultaneously  with the receipt by the Custodian of the proceeds
of sale of any  Pledged  Bonds  which  are  remarketed  in  accordance  with the
Indenture and the  Remarketing  Agreement for a purchase  price of not less than
the principal  amount thereof,  Pledged Bonds in a principal amount equal to the
purchase  price shall be released  from the lien of this  Pledge  Agreement  and
delivered at the direction of the Remarketing  Agent.  The Custodian agrees that
the proceeds of such sale will be disbursed in accordance with the provisions of
Section 8.11 of the Indenture.


                                        3

<PAGE>



          (b) Upon  receipt by the  Custodian of written  notice from  Sumitomo,
which notice may be sent by telecopy if immediately  confirmed in wilting,  that
Sumitomo has received  payment or  prepayment in full of all amounts owing under
the  Reimbursement  Agreement,  all such Pledged Bonds and any other  Collateral
pledged to Sumitomo then subject to the lien of this Pledge  Agreement  shall be
released  herefrom and registered in the name of and delivered to the Company or
its order.

     7. Exculpatory  Provisions.  Neither the Custodian nor any of its offlcers,
directors,  employees,  agents,  attorneys-in-fact or affiliates shall be liable
for any action  lawfully taken or omitted to be taken by it or such person under
or in connection with this Pledge Agreement (except for its or each person's own
gross  negligence  or willful  misconduct),  including any failure to correct or
realize upon the Obligations or any Collateral, security or guaranty therefor or
any part thereof The Company hereby  indemnifies  the Custodian from and against
any and all claims,  losses,  damages,  liabilities  and  expenses  which may be
imposed on, incurred by or asserted  against the Custodian in any way related to
or arising out of the subject matter of this Pledge  Agreement  (except for such
claims,  losses,  damages,  liabilities  and  expenses  which  arise  out of the
Custodian's gross negligence or willful misconduct). The Custodian undertakes to
perform only such duties as are expressly  set forth  herein.  The Custodian may
rely and shall be protected in acting or refraining from acting upon any written
notice,  instruction or request  furnished to it hereunder and believed by it to
be  genuine-  and to  have  been  signed  or  presented  by an  Authorized  Bank
Representative; "Authorized Bank Representative" means any one of the persons at
the  time  designated  to act on  behalf  of  Sumitomo  by  written  certificate
furnished to the Custodian, which certificate shall be substantially in the form
set forth in Attachment A attached  hereto and by reference  made a part hereof,
and may be changed from time to time by Sumitomo furnishing a new certificate to
the  Custodian.  The  Custodian  may consult  with counsel of its own choice and
shall have full and complete  authorization  and protection for any action taken
or suffered by it hereunder in good faith and in accordance  with the opinion of
such counsel.  Notwithstanding  any provision to the contrary  contained herein,
the Custodian  shall not be responsible for any act or failure to act absent its
gross negligence or willful misconduct.

     8.  Resignation  or Removal of  Custodian.  The Custodian may resign and be
discharged from its duties and  obligations  hereunder by giving at least thirty
(30) days' prior written notice of such resignation to Sumitomo,  specifying the
date on which such resignation is to take effect.  Sumitomo, with the consent of
the Company  (which consent shall not be  unreasonably  withheld and which shall
not be  required  if an Event of Default  (as  defined in Section 9 hereof)  has
occurred and is  continuing),  may remove and discharge  the Custodian  from its
duties and  obligations  hereunder  by giving at least five (5)  Business  Days'
prior  written  notice of such removal to the Custodian  specifying  the date on
which such removal is to take effect.

     9. Event of  Default.  The term  "Event of  Default" as used in this Pledge
Agreement  shall  mean (a) an Event  of  Default  under  and as  defined  in the
Reimbursement  Agreement or (b) (i) the failure by any of the parties  hereto to
comply with the  provisions  of Sections 3 or 6 hereof,  (ii) the failure by the
Company to perform or observe any covenant contained in Section 12 or 13 hereof,

                                        4

<PAGE>



or (iii) any  representation or warranty made by the Company pursuant to Section
12 hereof proving to have been incorrect in any material respect when made.

     10. Rights of Sumitomo. Sumitomo shall not be liable for failure to collect
or realize  upon the  Obligations  or any  Collateral  or any  security or other
guarantee therefor, or any part thereof, or for any delay in so doing, nor shall
either party be under any obligation to take any action  whatsoever  with regard
thereto.  If an Event of Default or event  which with notice or lapse of time or
both would become an Event of Default has occurred and is  continuing,  Sumitomo
may  thereafter,  without  notice,  exercise all rights,  privileges  or options
pertaining  to any Pledged  Bonds  pledged to  Sumitomo as if Sumitomo  were the
holder and absolute  owner  thereof,  upon such terms and conditions as Sumitomo
may determine,  all without  liability except to account for Collateral or other
property  actually  received  by it,  but  Sumitomo  shall  not have any duty to
exercise any of the  aforesaid  rights,  privileges  or options and shall not be
responsible for any failure to do so or delay in so doing.

         11.  Remedies.  In the event any  portion of the  Obligations  has been
declared due and payable,  Sumitomo may, with the prior written  approval of the
Company, forthwith collect, receive, appropriate and realize upon the Collateral
pledged to it, or any part thereof,  and/or may  forthwith  sell,  assign,  give
option or options to  purchase,  contract  to sell or  otherwise  dispose of and
deliver  said  Collateral  pledged  to it, or any part  thereof,  in one or more
parcels at public or private sale or sales,  at any exchange,  broker's board or
at any of Sumitomo's branches, agencies or offices, or elsewhere upon such terms
and conditions as Sumitomo and the Company may deem advisable and at such prices
as Sumitomo  and the Company may deem best,  for cash or on credit or for future
delivery without  assumption of any credit risk, with the right to Sumitomo upon
any such sale or sales,  public or private, to purchase the whole or any part of
said  Collateral  pledged  to it and so sold,  free of any  right or  equity  of
redemption  in the Company which right or equity is hereby  expressly  waived or
released.  Sumitomo  shall  pay over the net  proceeds  of any such  collection,
recovery,  receipt,  appropriation,  realization  or sale  after  deducting  all
reasonable  costs and expenses of every kind  incurred  therein or incidental to
the care,  safekeeping or otherwise of any and all of the Collateral  pledged to
it or in any  way  relating  to the  rights  of  Sumitomo  hereunder,  including
reasonable  attorneys' fees and legal expenses,  to the payment,  in whole or in
part, of the Obligations in such order as Sumitomo may elect.

     12.  Representations,  Warranties and Covenants of the Company. The Company
represents, warrants and covenants that:

          (a) on the date of delivery to  Sumitomo or to the  Custodian  for the
account of Sumitomo of any Pledged  Bonds  described  herein,  the Company shall
have taken no action which would  create any right,  title or interest in and to
the Pledged Bonds in favor of the Remarketing Agent or the Trustee;

          (b)  it  has,  and on the  date  of  delivery  to  Sumitomo  or to the
Custodian  for the  account of Sumitomo  of any  Pledged  Bonds will have,  full
power, authority and legal right

                                        5

<PAGE>



to pledge all of Its  right,  title and  interest  in and to the  Pledged  Bonds
pursuant to this Pledge Agreement;

          (c) this  Pledge  Agreement  has been duly  authorized,  executed  and
delivered by the Company and constitutes a legal,  valid and binding  obligation
of  the  Company   enforceable   in  accordance   with  its  terms,   except  as
enforceability   may  be   limited   by   applicable   bankruptcy,   insolvency,
reorganization,  moratorium or similar laws affecting  creditors' rights a.-,id,
to the extent that such  instruments  require or may require,  enforcement  by a
court of equity,  such principles of equity as the court having jurisdiction may
impose;

          (d) no consent of any other party (including,  without limitation, the
creditors  of  the  Company)  and  no  consent,  license,  permit,  approval  or
authorization of, exemption by, notice or report to, or registration,  filing or
declaration with, any governmental  authority,  domestic or foreign, is required
to be obtained  by the Company in  connection  with the  execution,  delivery or
performance of this Pledge Agreement;

          (e) the execution,  delivery and performance of this Pledge  Agreement
will not result in a material  violation of any provision of any  applicable law
or regulation or of any order, judgment,  writ, award or decree directly binding
on the Company of any court, arbitrator or governmental  authority,  domestic or
foreign,  or of the  Company's  organizational  documents,  or of any  mortgage,
indenture,  lease,  contract,  or other agreement,  instrument or undertaking to
which the Company is a party or which,  to the best  knowledge  of the  Company,
purports to be binding upon the Company or upon any of its respective assets and
will not result in the creation or imposition of any lien, charge or encumbrance
on or  security  interest  in  any of  the  assets  of  the  Company  except  as
contemplated by this Pledge Agreement; and

          (f) the pledge,  assignment and delivery of the Pledged Bonds pursuant
to this Pledge Agreement will create a valid first lien on and a first perfected
security interest in Sumitomo in all right,  title or interest of the Company in
or to such  Bonds,  and the income  and  proceeds  thereof,  subject to no prior
pledge,  lien, mortgage,  hypothecation,  security interest,  charge,  option or
encumbrance  or to any  agreement  purporting  to  grant  to any  third  party a
security  interest in the property or assets of the Company  which would include
the  Pledged  Bonds.  The  Company  covenants  and  agrees  that it will  defend
Sumitomo's  right,  title and security  interest in and to the Pledged Bonds and
the income and  proceeds  thereof  against the claims and demands of all persons
whomsoever.

     13. No Disposition,  Etc. The Company agrees that it will not,  without the
prior written consent of Sumitomo, sell, assign, transfer, exchange or otherwise
dispose  of, or grant any option  with  respect  to, the  Collateral  (except as
provided in Section 6 of this Pledge  Agreement),  nor will it create,  incur or
permit to exist any pledge,  lien, mortgage,  hypothecation,  security interest,
charge,  option or any other  encumbrance with respect to any of the Collateral,
or any  interest  therein,  or any  proceeds  thereof,  except  for  the Hen and
security interest provided for by this Pledge Agreement.

                                        6

<PAGE>




     14. Further  Assurances.  The Company agrees that at any time and from time
to time,  upon the written  request of  Sumitomo,  the Company  will execute and
deliver  such further  documents  and do such @er acts and perform all things as
Sumitomo may  reasonably  request in order to effect the purposes of this Pledge
Agreement.

     15.  Severability.   Any  provision  of  this  Pledge  Agreement  which  is
prohibited or unenforceable in any jurisdiction  shall, as to such jurisdiction,
be ineffective to the extent of such  prohibition  or  unenforceability  without
invalidating  the  remaining  provisions  hereof,  and any such  prohibition  or
unenforceability   in  any   jurisdiction   shall  not   invalidate   or  render
unenforceable such provision in any other jurisdiction.

     16. No Waiver:  Cumulative Remedies.  Sumitomo shall not by any act, delay,
omission  or  otherwise  be deemed to have  waived any of its rights or remedies
hereunder,  and no waiver shall be valid unless in writing,  signed by Sumitomo,
and then only to the extent therein set forth. A waiver by Sumitomo of any right
or remedy  hereunder on any one occasion  shall not be construed as a bar to any
right or remedy which Sumitomo would otherwise have on any further occasion.  No
failure to exercise nor any delay in exercising by Sumitomo of any right,  power
or privilege  hereunder shall operate as a waiver thereof,  nor shall any single
or partial  exercise of any right,  power or  privilege  hereunder  preclude any
other or further exercise  thereof or the exercise of any other right,  power or
privilege.  The rights and remedies  herein  provided are  cumulative and may be
exercised singly or concurrently and are not exclusive of any rights or remedies
provided by law.

     17. Waivers, Amendments: Applicable Law. None of the terms or provisions of
this Pledge Agreement may be waived,  altered,  modified or amended except by an
instrument in writing, duly executed by Sumitomo, the Company and the Custodian.
This Pledge  Agreement and all  obligations  of the Company  hereunder  shall be
binding upon the successors and assigns of the Company and shall,  together with
the rights and  remedies of  Sumitomo,  inure to the benefit of Sumitomo and its
respective  successors  and assigns.  THE  OBLIGATIONS OF THE PARTIES UNDER THIS
PLEDGE  AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS
OF THE STATE OF CALIFORNIA.

     18. Term.  This Pledge  Agreement shall remain in full force and effect for
so long as the Letter of Credit is in effect or any  amount is owed to  Sumitomo
under this Pledge  Agreement,  the  Reimbursement  Agreement or any other Credit
Documents,  provided  that in the event of the  resignation  or  removal  of the
Trustee under the Indenture, the Custodian shall resign or be removed under this
Pledge Agreement,  and the successor Trustee appointed under the Indenture shall
be appointed as the successor custodian under this Pledge Agreement.

     19. Notices.  Unless otherwise  provided for in this Pledge Agreement,  any
notice  required or  permitted  to be given under this Pledge  Agreement  may be
given  by  certified  or  registered  mail,  return  receipt  requested,  or by,
telecopy, charges prepaid, or by commercial overnight delivery service, prepaid,
addressed:

                                        7

<PAGE>




         If to the Company:

                  Advanced Aerodynamics and Structures, Inc.
                  3501 Lakewood Boulevard
                  Long Beach, California 90808
                  Attention:  Carl L. Chen, Ph.D.
                  Telecopy:   (562) 938-8620
                  Telephone:  (562) 938-8618

         If to the Custodian:

                  First Trust of California, National Association
                  One California Street, Fourth Floor
                  San Francisco, California 94111
                  Attention:  Corporate Trust Department
                  Telecopy:   (415) 273-4590
                  Telephone:  (415) 273-4576

         If to Sumitomo:

                  The Sumitomo Bank, Limited
                  Los Angeles Branch
                  777 South Figueroa Street, Suite 2600
                  Los Angeles, California 90017
                  Attention:  Manager - Structured Finance
                              and Financial Institutions Group
                  Telecopy:   (213) 623-6832
                  Telephone: (213) 955-0800

Any  notice  sent by mail  shall be  deemed  given  three  (3) days  after it is
deposited in the mails.  Any notice sent by telecopy  shall be deemed given when
sent. Any notice sent by commercial  overnight  delivery service shall be deemed
given one (1) Business Day after it is deposited for  delivery.  Notwithstanding
anything  herein to the contrary,  notices to release Bonds from Sumitomo to the
Custodian  may be made by  telecopy  and each  such  notice  shall  be  promptly
confirmed in writing as specified above.

     20.  Execution in  Counterparts.  This Pledge  Agreement may be executed in
multiple counterparts, each of which shall be an original and all of which shall
constitute but one and the same instrument.



                                        8

<PAGE>



     IN WITNESS WHEREOF, the parties hereto have caused this Pledge Agreement to
be duly executed and delivered by their duly  authorized  officers as of the day
and year first above written.



ADVANCED AERODYNAMICS AND
STRUCTURES, INC.


By:
         President
ATTEST:

By:
         Secretary

(SEAL)






THE SUMITOMO BANK, LIMITED


By:
         , Los Angeles Branch

FIRST TRUST OF CALIFORNIA,
NATIONAL ASSOCIATION,  as Custodian


By:
Its:



                                        9

<PAGE>


                                  ATTACHMENT A
                                       TO
                                PLEDGE AGREEMENT

             CERTIFICATE DESIGNATING AUTHORIZED BANK REPRESENTATIVES

     The  Sumitomo  Bank,  Limited,   acting  through  its  Los  Angeles  Branch
("Sumitomo"),   hereby   certifies  to  FIRST  TRUST  OF  CALIFORNIA,   NATIONAL
ASSOCIATION  (the  "Custodian"),  as custodian  agent for Sumitomo in accordance
with that certain Custody, Pledge and Security Agreement,  dated as of August 1,
1997  among  Advanced  Aerodynamics  and  Structures,  Inc.,  Sumitomo  and  the
Custodian, that the "Authorized Bank Representatives' for Sumitomo from the date
of this Certificate until the Custodian's receipt of a Certificate  furnished in
replacement hereof shall be the following individuals so designated below:

Name                                       Specimen Signature



     IN WITNESS  WHEREOF,  Sumitomo has executed this Certificate as of this lst
day of August, 1997.

                                          THE SUMITOMO BANK, LIMITED


                                           By:
                                           Title:




                                       10

                              INVESTMENT AGREEMENT


         THIS INVESTMENT AGREEMENT (this "Investment  Agreement"),  dated August
5, 1997 is by and between  ADVANCED  AERODYNAMICS  AND  STRUCTURES,  INC.  ("the
Company"),  and THE SUMITOMO BANK,  LIMITED (the "Bank"),  acting by and through
its Los Angeles Branch.

                                   WITNESSETH:

         WHEREAS, the California Economic  Development  Financing Authority (the
"Issuer") has issued its Variable  Rate Demand  Industrial  Development  Revenue
Bonds,  Series, 1997 (Advanced  Aerodynamics and Structures,  Inc. Project) (the
"Bonds")  in  the  aggregate  principal  amount  of  $8,500,000  pursuant  to an
Indenture  of Trust  dated as of August 1, 1997 (the  "Indenture")  between  the
Issuer and First Trust of California, National Association (the "Trustee"); and

         WHEREAS,  the Bank has agreed to issue its Irrevocable Letter of Credit
No.  G/LA-400557 dated August 5, 1997 (the "Letter of Credit") to secure payment
of  principal  of,  interest on and purchase  price of, the Bonds  pursuant to a
Reimbursement   Agreement  dated  as  of  August  1,  1997  (the  "Reimbursement
Agreement") between the Bank and the Company; and

         WHEREAS,  to induce  the Bank to issue the  Letter of Credit and secure
the  obligations of the Company to the Bank under the  Reimbursement  Agreement,
the Company has agreed to deposit  certain moneys with the Bank pursuant to this
Investment Agreement;

         NOW,  THEREFORE,  in  consideration  of the foregoing and of the mutual
covenants  hereinafter  set forth,  the parties  intending  to be legally  bound
hereby agree as follows:

         Section  1.  Invested  Funds.  The  Company  hereby   establishes  this
Investment  Agreement  with the Bank and agrees  that,  pursuant to the terms of
this Investment Agreement,  the Company shall invest with the Bank the aggregate
amount of $8,500,000  (the  "Invested  Funds").  The Company agrees to cause the
Invested  Funds to be  delivered  to the Bank on August  5, 1997 for  investment
pursuant  to  the  terms  of  this  Investment  Agreement.  The  Company  hereby
acknowledges that the Invested Funds and any interest accrued thereon under this
Investment   Agreement  are  not  insured  by  the  Federal  Deposit   Insurance
Corporation.

         Section 2.  Investments with the Bank.  Investments  hereunder shall be
made by wire  transfer  in  immediately  available  funds  to  Sumitomo  Bank of
California,  San  Francisco,  California,  ABA #121002042 for the account of the
Bank, account number 051-014969-86, reference: AASI.

         Section 3. Term of Agreement.  This Investment Agreement will terminate
with  respect  to the  Invested  Funds on the  earlier  of August 5, 2002 or the
Expiration Date of the Letter of Credit (the "Maturity Date") unless extended at
the request of the Company with the approval of the Bank.  Prior to the Maturity
Date,  the Bank shall have absolute and  unconditional  custody and control over
the invested Funds.  Subject to the terms of the  Reimbursement  Agreement,  the
Invested Funds shall


<PAGE>



be due and payable by the Bank to the Company in immediately  available funds to
the account specified by the Company to the Bank on the Maturity Date.  Provided
no Event of Default  has  occurred  and is  continuing  under the  Reimbursement
Agreement, Invested Funds shall be due and payable by the Bank to the Company in
immediately  available funds to the account specified by the Company to the Bank
within seven days  following  (i) an optional  redemption  of Bonds  pursuant to
Article  IV of the  Indenture  in the  amount of the Bonds so  redeemed  or (ii)
receipt of a request by the Company,  which  request shall be  accompanied  by a
certificate of the Company delivered to the Trustee and the Bank,  acknowledging
that the Bank shall not approve any Requisition  pursuant to Section 3.03 of the
Indenture  at any time that the  aggregate  amount held by the Bank  pursuant to
this Investment  Agreement is less than the aggregate  principal amount of Bonds
Outstanding  and that an amount of Bond proceeds at least equal to the amount of
Invested Funds paid to the Company has been invested with the Bank.

         Section 4.  Interest.  Interest  shall accrue on the daily  outstanding
balance of the Invested Funds from and including August 5, 1997 to and including
August 13, 1997 at 5.475% per annum  (calculated  on the basis of a 360-day year
for actual number of days elapsed) and  thereafter to and including the Maturity
Date at LIBOR (as hereinafter defined) less 0. 15 % per annum (calculated on the
basis of a 3 60-day year for actual  number of days  elapsed).  As used  herein,
"LIBOR"  means  with  respect  to any Reset Date (as  hereinafter  defined)  the
arithmetic  mean of the rates shown on the LIBOR display on the Reuters  monitor
screen as the London  Interbank  offered rates for deposits in Dollars quoted by
Barclays Bank International  Limited,  Bank of Tokyo,  Bankers Trust Company and
National  Westminster  Bank, PLC, at approximately I 1:00 a.m.,  London time, on
the day that is two Business  Days  preceding the Reset Date for a period of one
(1) week commencing on the Reset Date. "Reset Date" means the first business day
of each calendar week.

         Provided no Event of Default has occurred and is  continuing  under the
Reimbursement Agreement,  interest shall be credited to the account specified by
the Company on the first Business Day of each month,  on the Maturity Date or on
any earlier  date on which  Invested  Funds are paid to the  Company  hereunder.
Interest  in an  amount  equal to  one-quarter  of the total  interest  accruing
hereunder  through  August  5,  1999  shall be added to and  become  part of the
Invested  Funds on such date. The balance shall be paid to or for the account of
the  Company on such date to the account  specified  in or pursuant to Section 3
hereof or as otherwise directed by the Company.

         Section 5.  Representations and Warranties.  (a) The Company represents
and warrants to the Bank that: (i) this Investment Agreement constitutes a valid
and binding  obligation  of the Company;  and (ii) the  execution,  delivery and
performance  of this  Investment  Agreement  by the Company will not result in a
breach or  violation  of or cause a  default  under  any  provision  of any law,
regulation,  order, license, decree, judgment,  indenture, contract or agreement
binding upon the Company.

         (b) The Bank  represents  and  warrants to the Company  that:  (i) this
Investment Agreement constitutes a valid and binding obligation of the Bank; and
(ii) the execution, delivery and performance of this Investment Agreement by the
Bank will not result in a breach or  violation  of or cause a default  under any
provision of any law, regulation,  order, ]license, decree, judgment, indenture,
contract or agreement binding upon the Bank.


<PAGE>



         Section 6. Role of the Bank. It is expressly understood and agreed that
in performing its obligations hereunder,  the Bank is not acting as a fiduciary,
agent or other  representative  for the registered owners of the Bonds or anyone
else, and that neither the Bank nor any of its directors,  officers,  employees,
or agents shall be liable or responsible  for: (i) the payment to the registered
owners of any amounts owing on or with respect to the Bonds; or (ii) any acts or
omissions of the Issuer or the Trustee  under or with respect to the validity or
enforceability of the Bonds or the Indenture.

         Section 7. No Implied  Rights.  Nothing  expressed or implied herein is
intended or shall be  construed to confer upon any person,  firm or  corporation
other  than the  parties  hereto  any  right,  remedy or claim by reason of this
Investment Agreement or any term hereof, and all terms contained herein shall be
for the sole and exclusive benefit of the parties hereto and their successors.

         Section 8.  Notices.  All notices  given  pursuant  to this  Investment
Agreement shall be given  telephonically,  with verification sent by first-class
mail,  postage  prepaid,  or by telex or  telecopier,  or  overnight  commercial
courier sent that Business Day to the addresses  listed below,  or to such other
addresses  or to the  attention  of such other  person as such party  shall have
designated for such purpose in a written notice to the other:

         To the Company as follows:

                  Advanced Aerodynamics and Structures, Inc.
                  3501 Lakewood Boulevard
                  Long Beach, California 90808
                  Attention: Carl L. Chen, Ph.D.
                  Telecopy:  (562) 938-8620
                  Telephone: (562) 938-8618

          To Sumitomo as follows:

                  The Sumitomo Bank, Limited
                  Los Angeles Branch
                  777 South Figueroa Street, Suite 2600
                  Los Angeles, California 90017
                  Attention: Manager - Structured Finance
                             and Financial Institutions Group
                  Telecopy:  (213) 623-6832
                  Telephone: (213) 955-0800




<PAGE>



         To the Trustee as follows:

                  First Trust of California, National Association
                  One California Street, Fourth Floor
                  San Francisco, California 94111
                  Attention: Corporate Trust Department
                  Telecopy:  (415) 273-4590
                  Telephone: (415) 273-4576

However, the failure by either party to provide written confirmation on the same
Business  Day of any  telephonic  notice  given  hereunder  will not result in a
breach of this Investment Agreement.

         Section 9. Successors and Assigns.  This  Investment  Agreement and all
obligations and rights arising  hereunder shall be binding upon and inure to the
benefit of the parties hereto and their respective  successors,  transferees and
assigns.  This Investment Agreement may not be assigned by any party without the
prior written consent of the other party.

          Section 10. Amendments and Waivers.  This Investment Agreement may not
be modified,  amended or  supplemented,  and no term or provision  hereof may be
waived, except in writing signed by the parties hereto.

          Section 11. Governing Law. The obligations of the Company and the Bank
under this Investment Agreement shall be governed by and construed in accordance
with the laws of the State of California.

          Section 12. Counterparts. This Investment Agreement may be executed in
counterparts,  each of which shall be deemed to be an original  and all of which
taken together shall constitute one and the same instrument.




<PAGE>


         IN WITNESS  WHEREOF,  the parties  hereto  have caused this  Investment
Agreement to be executed as of the date written above.


                                     THE SUMITOMO BANK, LIMITED



                                     By:_____________________________________
                                                      , Los Angeles Branch


                                     ADVANCED AERODYNAMICS AND STRUCTURES,
                                     INC.


                                     By:_____________________________________
                                           President


ATTEST:


By:____________________________
         Secretary

(SEAL)



                             DIRECT OBLIGATION NOTE


         FOR  VALUE  RECEIVED,   the  undersigned,   ADVANCED  AERODYNAMICS  AND
STRUCTURES,  INC. (the  "Company),  hereby promises to pay to THE SUMITOMO BANK,
LIMITED  ("Sumitomo"),  a banking corporation organized under the laws of Japan,
acting through its Los Angeles  Branch,  on or before August 5, 2002, the lesser
of (i) the principal sum of Eight Million Six Hundred Twenty-Five Thousand Seven
Hundred Fifty-Four Dollars ($8,625,754), together with all other amounts due and
owing under the  Reimbursement  Agreement dated as of August 1, 1997 (as amended
from time to time,  the  "Reimbursement  Agreement")  between  the  company  and
Sumitomo,  or (ii) the  aggregate  outstanding  amount of all loans  made to the
Company by Sumitomo pursuant to the Reimbursement  Agreement,  together with all
other amounts due and owing under the  Reimbursement  Agreement,  in immediately
available  funds at the principal  corporate  office of  Sumitomo's  Los Angeles
Branch in Los Angeles,  California (or such other office of Sumitomo  located in
the United States of America as Sumitomo may designate to the Company in writing
from time to time), on the dates and at the times specified in the Reimbursement
Agreement and to pay interest on the outstanding  balance of such amounts at the
times  specified in the  Reimbursement  Agreement at a rate per annum (except as
otherwise  specified  in the  Reimbursement  Agreement)  equal to (x) LIBOR less
0.15% per annum and (y) with respect to any amount not paid when due, a rate per
annum equal to the sum of the corporate  base rate publicly  announced by Morgan
Guaranty  Trust  Company of New York in New York,  New York for its  successor),
from time to time as its  prevailing  corporate  base  rated,  which  rate shall
change when and as said  corporate base rate changes,  plus two percent  (2.0%).
Sumitomo is  authorized  to record all loans and all payments made on account of
the principal due on the loans on the Loan Schedule  attached hereto.  Such Loan
Schedule,  and any continuations  thereof,  are hereby incorporated by reference
herein and made a party hereof,  and  Sumitomo's  endorsements  thereon shall be
conclusive  absent manifest  error.  The failure to make any such notation shall
not, however,  affect the Company's obligations under this Note. As used herein,
"LIBOR"  means  with  respect  to any Reset Date (as  hereinafter  defined)  the
arithmetic  mean of the rates at which  deposits in U.S.  Dollars are offered by
four  major  banks in the  London  interbank  market  selected  by the Bank,  at
approximately  11:00 a.m.,  London time,  on the day that is two  Business  Days
preceding  the Reset Date to prime  banks in the London  interbank  market for a
period  of one (1)  week  commencing  on the  Reset  Date.  "Reset  Date"  means
Wednesday of each week (or, if such  Wednesday  is not a Business  Day, the next
Business Day).


                                        1

<PAGE>



         This obligation is issued under, and is subject to all of the terms of,
the Reimbursement  Agreement.  Terms defined in the Reimbursement  Agreement and
not otherwise defined herein shall have the same meanings herein as therein.

         Notwithstanding the due date of this Note each and every amount payable
shall be  accelerated  to the  extent  that:  (x) funds are  available  from the
Trustee from sources available under the Indenture, (y) funds are available from
the Remarketing  Agent from the remarketing  proceeds of the Bonds, or (z) funds
are available from any Alternate Letter of Credit (as defined in the Indenture).

         The Company hereby waives  presentment  for payment,  demand,  protest,
notice  of  protest,  notice  of  dishonor  and all  defenses  on the  ground of
extension  of time of payment for the payment  hereof  which may be given (other
than in writing) by Sumitomo to the Company.

         This Note shall be governed by and  construed  in  accordance  with the
laws of the State of California.

         IN  WITNESS  WHEREOF,  the  Company  has  caused  this  Note to be duly
executed.

Dated: __________________

                                           ADVANCED AERODYNAMICS AND
                                           STRUCTURES, INC.


                                            By:________________________________
                                               President

ATTEST:

By:________________________
         Secretary

                                        2

<PAGE>


                                  LOAN SCHEDULE



                 Principal      Principal                        Notation
   Date           Amount          Paid           Balance          Made By
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========
===========    ===========     ===========     ===========      ===========



                                        3




                    ADVANCED AERODYNAMICS & STRUCTURES, INC.
                        (A Development Stage Enterprise)


                 Statement Re: Computation of Per Share Earnings



<TABLE>
                                                      For the Three Months Ended           For the Nine Months Ended
                                                             September 30                         September 30
                                                 ---------------------------------------------------------------------------------
                                                        1996              1997              1996              1997
                                                 ---------------------------------------------------------------------------------
<S>                                                <C>                <C>                <C>               <C>
Net loss                                           $  (380,000)      $(2,365,000)       $(1,726,000)      $(4,242,000)
                                                 ---------------------------------------------------------------------------------
Weighted average number of Class B
Common Stock shares outstanding                      2,000,000         2,000,000          2,000,000         2,000,000
Common Stock equivalents from the issuance
of Bridge Warrants computed using the
treasury stock method                                1,400,000                            1,400,000
Weighted average number of Class A
Common Stock shares outstanding                                        6,900,000                            6,900,000
                                                 ---------------------------------------------------------------------------------
                                                     3,400,000         8,900,000          3,400,000         8,900,000
                                                 =================================================================================
Net loss per share                                       ($.11)            ($.27)             ($.51)            ($.48)
                                                 =================================================================================
</TABLE>







<TABLE> <S> <C>

<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                       6,922,000
<SECURITIES>                                 5,924,000
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            13,291,000
<PP&E>                                       3,737,000
<DEPRECIATION>                             (1,645,000)
<TOTAL-ASSETS>                              24,572,000
<CURRENT-LIABILITIES>                          554,000
<BONDS>                                              0
                                0
                                          0
<COMMON>                                         1,000
<OTHER-SE>                                  23,477,000
<TOTAL-LIABILITY-AND-EQUITY>                24,572,000
<SALES>                                              0
<TOTAL-REVENUES>                               891,000
<CGS>                                                0
<TOTAL-COSTS>                                5,133,000
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                             (4,242,000)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                         (4,242,000)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                (4,242,000)
<EPS-PRIMARY>                                    (.48)
<EPS-DILUTED>                                    (.48)
        

</TABLE>


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