AAR CORP
SC 13G/A, 1997-01-24
MACHINERY, EQUIPMENT & SUPPLIES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                                                                

                                  SCHEDULE 13G




                    Under the Securities Exchange Act of 1934
                               (Amendment No. 3)*


                                    AAR Corp.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
                                    000361105
- --------------------------------------------------------------------------------
                                 (CUSIP Number)



Check here if a fee is being paid with this statement:  . (A fee is not required
only if the  filing  person:  (1) has a  previous  statement  on file  reporting
beneficial  ownership  of more than  five  percent  of the  class of  securities
described in Item 1; and (2) has filed no amendment subsequent thereto reporting
beneficial ownership of five percent or less of such class.) (See Rule 13d-7).

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).













                               PAGE 1 OF 11 PAGES
<PAGE>

- ---------------------                                     ----------------------
CUSIP No.   000361105                 13G                 Page  2  of  11  Pages
- ---------------------                                     ----------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Mutual Life Insurance Company
          I.R.S. No. 04-1414660
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*              a)  |_|
                                                                        (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None,  except through its indirect,  wholly-owned  subsidiaries,  John
          Hancock Advisers, Inc. and NM Capital Management, Inc.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IC, BD, IA, HC
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 2 OF 11 PAGES
<PAGE>

- ---------------------                                     ----------------------
CUSIP No.   000361105                 13G                 Page  3  of  11  Pages
- ---------------------                                     ----------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Subsidiaries, Inc.
          I.R.S. No. 04-2687223
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  |_|
                                                                        (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None,  except through its indirect,  wholly-owned  subsidiaries,  John
          Hancock Advisers, Inc. and NM Capital Management, Inc.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 3 OF 11 PAGES
<PAGE>

- ---------------------                                     ----------------------
CUSIP No.   000361105                 13G                 Page  4  of  11  Pages
- ---------------------                                     ----------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Asset Management
          I.R.S. No.   04-3279774
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*             (a)  |_|
                                                                        (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          None,  except through its indirect,  wholly-owned  subsidiaries,  John
          Hancock Advisers, Inc. and NM Capital Management, Inc.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 4 OF 11 PAGES
<PAGE>

- ---------------------                                     ----------------------
CUSIP No.   000361105                 13G                 Page  5  of  11  Pages
- ---------------------                                     ----------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          The Berkeley Financial Group
          I.R.S. No. 04-3145626
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*            (a)  |_|
                                                                       (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Commonwealth of Massachusetts
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 -0-

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each                  -0-

                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  -0-

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          579,340:  577,500 through its  wholly-owned  subsidiary,  John Hancock
          Advisers, Inc. and 1,840 through its direct,  wholly-owned subsidiary,
          NM Capital Management, Inc.
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          See line 9, above.
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          HC
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 5 OF 11 PAGES
<PAGE>

- ---------------------                                     ----------------------
CUSIP No.   000361105                 13G                 Page  6  of  11  Pages
- ---------------------                                     ----------------------

- --------------------------------------------------------------------------------
   1      NAME OF REPORTING PERSON
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

          John Hancock Advisers, Inc.
          I.R.S. No. 04-2441573
- --------------------------------------------------------------------------------
   2      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*            (a)  |_|
                                                                       (b)  |_|
          N/A
- --------------------------------------------------------------------------------
   3      SEC USE ONLY

- --------------------------------------------------------------------------------
   4      CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware
- --------------------------------------------------------------------------------
                      5     SOLE VOTING POWER
    Number of
     Shares                 577,500

                   -------------------------------------------------------------
  Beneficially        6     SHARED VOTING POWER
    Owned by
      Each
                            -0-
                   -------------------------------------------------------------
    Reporting         7     SOLE DISPOSITIVE POWER
     Person
      With                  577,500

                   -------------------------------------------------------------
                      8     SHARED DISPOSITIVE POWER

                            -0-

- --------------------------------------------------------------------------------
   9      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

          577,500
- --------------------------------------------------------------------------------
   10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

          N/A
- --------------------------------------------------------------------------------
   11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

          3.6%
- --------------------------------------------------------------------------------
   12     TYPE OF REPORTING PERSON*

          IA
- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
                               PAGE 6 OF 11 PAGES
<PAGE>

     The original  statement  shall be signed by each person on whose behalf the
statement is filed or his authorized representative.  If the statement is signed
on behalf of a person by his authorized  representative  other than an executive
officer  or   general   partner  of  the   filing   person,   evidence   of  the
representative's  authority to sign on behalf of such person shall be filed with
the  statement,  provided,  however,  that a power of attorney  for this purpose
which is already on file with the Commission may be  incorporated  by reference.
The name and any title of each person who signs the statement  shall be typed or
printed beneath his signature.

Note: Six copies of this statement, including all exhibits, should be filed with
the Commission.

     Attention:  Intentional  misstatements  or  omissions  of  fact  constitute
Federal criminal violations (See 18 U.S.C. 1001)


     Item 1(a)      Name of Issuer:
                    AAR Corp.

     Item 1(b)      Address of Issuer's Principal Executive Offices:
                    1111 Nicholas Blvd.
                    Elk Grove Village, IL 60007

     Item 2(a)      Name of Person Filing:
                    This  filing is made on behalf of John  Hancock  Mutual Life
                    Insurance    Company    ("JHMLICO"),    JHMLICO's    direct,
                    wholly-owned  subsidiary,  John Hancock  Subsidiaries,  Inc.
                    ("JHSI"),  JHSI's  direct,   wholly-owned  subsidiary,  John
                    Hancock  Asset  Management  ("JHAM"),   JHAM's  wholly-owned
                    subsidiary, The Berkeley Financial Group ("TBFG") and TBFG's
                    wholly-owned subsidiary, John Hancock Advisers, Inc. 
                    ("JHA").                    

     Item 2(b)      Address of the Principal Offices:
                    The principal business offices of JHMLICO, JHSI and JHAM are
                    located at John  Hancock  Place,  P.O. Box 111,  Boston,  MA
                    02117. The principle business offices of TBFG and JHA are
                    located at 101 Huntington Avenue, Boston, Massachusetts 
                    02199.

     Item 2(c)      Citizenship:
                    JHMLICO, JHAM and TBFG were organized and exist under the
                    laws of the Commonwealth of Massachusetts. JHSI and JHA were
                    organized and exist under the laws of the State of Delaware.

     Item 2(d)      Title of Class of Securities:
                    Common Stock

     Item 2(e)      CUSIP Number:
                    000361105

     Item 3         If the Statement is being filed  pursuant to Rule  13d-1(b),
                    or 13d-2(b), check whether the person filing is a:

                    JHMLICO:  (a) (X)   Broker or Dealer registered under ss.15
                                        of the Act.

                              (c) (X)   Insurance Company as defined in 
                                        ss.3(a)(19) of the Act.

                              (e) (X)   Investment Adviser registered under 
                                        ss.203 of the Investment Advisers Act of
                                        1940.

                              (g) (X)   Parent Holding Company, in accordance 
                                        with ss.240.13d-1(b)(ii)(G).


                               PAGE 7 OF 11 PAGES

<PAGE>


                    JHSI:     (g) (X)   Parent Holding Company, in accordance 
                                        with ss.240.13d-1(b)(ii)(G).

                    JHAM:     (g) (X)   Parent Holding Company, in accordance 
                                        with ss.240.13d-1(b)(ii)(G).

                    TBFG:     (g) (X)   Parent Holding Company, in accordance 
                                        with ss.240.13d-1(b)(ii)(G).

                    NM:       (e) (X)   Investment Adviser registered under 
                                        ss.203 of the Investment Advisers Act of
                                        1940.
     Item 4         Ownership:

                    (a)  Amount Beneficially Owned: JHA has beneficial direct 
                         ownership of 577,500 shares of Common Stock. NM Capital
                         Management, Inc., ("NM"), a registered investment 
                         adviser which is the direct wholly-owned subsidiary of 
                         TBFG holds 1,840 shares in various private accounts. 
                         Through their parent-subsidiary relationship to JHA and
                         NM, JHMLICO, JHSI, JHAM and TBFG have indirect, 
                         beneficial ownership of these same shares.

                    (b)  Percent of Class:  3.6%

                    (c)  (i)       sole power to vote or to direct the vote: 
                                   NM:       340
                                   JHA:  577,500 shares of Common Stock under
                                   the Advisory Agreements as follows:
                                                            
                                                                  Date of
                                                  Number          Advisory
          Fund Name                               of Shares       Agreement
          ---------                               ---------       ---------
John Hancock Variable Series Trust 1              
Special Opportunities Portfolio                    17,000       April 15, 1994 
John Hancock Special Equities Fund                500,000       January 1, 1994
John Hancock Special Value Fund                    16,000       October 1, 1993
Johh Hancock Special Opportunities Fund            35,000       July 1, 1996   
John Hancock Special Opportunities Pension          7,000       June 26, 1996  
John Hancock Multi-Sector Growth Fund               2,500       January 30, 1995

                         (ii)      shared power to vote or to direct the vote: 
                                   -0-

                         (iii)     sole power to dispose or to direct the
                                   disposition of:
                                   NM:   1,840
                                   JHA:  has sole power to dispose or to direct
                                   the disposition of the 577,500 shares of
                                   Common Stock under the Advisory Agreements
                                   noted in Item 4(c)(i) above.

                         (iv)      shared power to dispose or to direct the 
                                   disposition of:  -0-

     Item 5         Ownership of Five Percent or Less of a Class:
                    With this filing, the Reporting Persons state that they own
                    five percent or less of Common Stock.

     Item 6         Ownership  of More than Five  Percent  on Behalf of  Another
                    Person: 
                    See Item 4.

                               PAGE 8 OF 11 PAGES
<PAGE>

     Item 7         Identification  and  Classification  of the Subsidiary which
                    Acquired  the  Security  Being  Reported  on by  the  Parent
                    Holding Company: 
                    See Items 3 and 4 above.

     Item 8         Identification and Classification of Members of the Group:
                    Not applicable.

     Item 9         Notice of Dissolution of a Group:
                    Not applicable.

     Item 10        Certification:
                    By signing below the undersigned certifies that, to the best
                    of its  knowledge  and belief,  the  securities  referred to
                    above were  acquired in the ordinary  course of business and
                    were not  acquired  for the  purpose  of and do not have the
                    effect of changing or influencing  the control of the issuer
                    of such  securities and were not acquired in connection with
                    or as a participant in any  transaction  having such purpose
                    or effect.




























                               PAGE 9 OF 11 PAGES


<PAGE>

                                    SIGNATURE

     After reasonable inquiry and to the best of its knowledge and belief,  each
of the undersigned certifies that the information set forth in this statement is
true, complete and correct.


                                      John Hancock Mutual Life Insurance Company
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: January 24, 1997               Title:   Senior Vice President & Treasurer


                                      John Hancock Subsidiaries, Inc.
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: January 24, 1997               Title:   Treasurer


                                      John Hancock Asset Management
                                      By:      /s/ James H. Young
                                      Name:    James H. Young
Dated: January 24, 1997               Title:   Secretary


                                      The Berkeley Financial Group
                                      By:      /s/ Susan S. Newton
                                      Name:    Susan S. Newton
Dated: January 24, 1997               Title:   Vice President


                                      NM Capital Management, Inc.
                                      By:      /s/ Susan S. Newton
                                      Name:    Susan S. Newton
Dated: January 24, 1997               Title:   Assistant Secretary


                               PAGE 10 OF 11 PAGES


<PAGE>


EXHIBIT A
                             JOINT FILING AGREEMENT

     John Hancock  Mutual Life  Insurance  Company,  John Hancock  Subsidiaries,
Inc.,  John Hancock  Asset  Management,  The Berkeley  Financial  Group and John
Hancock  Advisers,  Inc. agree that the terminating  Schedule 13G (Amendment No.
3), to which this  Agreement  is  attached,  relating to the Common Stock of AAR
Corp. is filed on behalf of each of them.


                                      John Hancock Mutual Life Insurance Company
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: January 24, 1997               Title:   Senior Vice President & Treasurer


                                      John Hancock Subsidiaries, Inc.
                                      By:      /s/ John T. Farady
                                      Name:    John T. Farady
Dated: January 24, 1997               Title:   Treasurer


                                      John Hancock Asset Management
                                      By:      /s/ James H. Young
                                      Name:    James H. Young
Dated: January 24, 1997               Title:   Secretary


                                      The Berkeley Financial Group
                                      By:      /s/ Susan S. Newton
                                      Name:    Susan S. Newton
Dated: January 24, 1997               Title:   Vice President


                                      NM Capital Management, Inc.
                                      By:      /s/ Susan S. Newton
                                      Name:    Susan S. Newton
Dated: January 24, 1997               Title:   Assistant Secretary


                               PAGE 11 OF 11 PAGES



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