AAR CORP
SC 13G/A, 1999-02-16
AIRCRAFT & PARTS
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                       Securities And Exchange Commission
                             Washington, D.C. 20549

                                  Schedule 13G
                -------------------------------------------------
                    Under the Securities Exchange Act of 1934
                                (AMENDMENT NO. 1)*

                                 AAR Corporation
                -------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
                -------------------------------------------------
                         (Title of Class of Securities)

                                    000361105
                -------------------------------------------------
                                 (CUSIP Number)

Check the following box 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
1945 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to al other provisions of the act (however, see the Notes).


                                Page 1 of 6 Pages



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- -------------------                                            -----------------
Cusip No. 000361105                   13G                      Page 2 of 6 pages
- -------------------                                            -----------------


- --------------------------------------------------------------------------------
1.     Name of Reporting Person
       2.  S.S. or I.R.S. Identification No. of Above Person

                      Westport Asset Management, Inc.
- --------------------------------------------------------------------------------
2.   Check the appropriate box if a member of a group*         (a)  [X]
                                                               (b)  [ ]
- --------------------------------------------------------------------------------
3.   SEC Use Only

- --------------------------------------------------------------------------------
4.   Citizenship or Place of Organization

                             Connecticut
- --------------------------------------------------------------------------------
                       5.  Sole Voting Power
Number of                       0
Shares                 ---------------------------------------------------------
Beneficially           6.  Shared Voting Power
Owned By                        2,188,700
Each                   ---------------------------------------------------------
Reporting              7.  Sole Dispositive Power
Person                          0
With                   ---------------------------------------------------------
                       8.  Shared Dispositive Power
                                2,188,700
- --------------------------------------------------------------------------------
9.   Aggregate Amount Beneficially Owned by each Reporting Person

                                    2,188,700
- --------------------------------------------------------------------------------
10.      Check Box if the aggregate amount in row (9) excludes certain shares*
                                                                          [ ]
- --------------------------------------------------------------------------------
11.      Percent of Class Represented by Amount in Row 9

                                      7.9%
- --------------------------------------------------------------------------------
12.      Type of Reporting Person*

                                       IA
- --------------------------------------------------------------------------------
                      * See Instruction Before Filling Out



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                                Page 3 of 6 pages


Item 1 (a)                   Name of Issuer:
- ----------                   ---------------

                                 AAR Corporation

Item 1 (b):                  Address of Issuer's Principal Executive Offices:
- -----------                  ------------------------------------------------

                                 1100 North Wood Dale Road
                                 Wood Dale, IL 60191

Item 2 (a):                  Name of Person Filing:
- -----------                  ----------------------

                             Westport Asset Management, Inc.

Item 2 (b):                  Address of Principal Business Office:
- -----------                  -------------------------------------

                             253 Riverside Avenue
                             Westport, CT  06880

Item 2(c):                   Citizenship:
- ---------                    ------------

                             Connecticut

Item 2(d):                   Title of Class of Securities:
- ---------                    -----------------------------

                             Common Stock

Item 2 (e):                  CUSIP Number:
- ----------                   -------------

                                    000361105

Item 3.                      If this stated is filed pursuant to Rules
- ------                       -----------------------------------------
                             13d-1(b), or 13d-2(b), check whether the person
                             filing is a:

                             (a)    (  )    Broker or Dealer registered under
                                            Section 15 of the Act

                             (b)    (  )    Bank as defined in Section 3(b)(6)
                                            of the Act



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                                Page 4 of 6 pages

                        (c)    (  )    Insurance Company as defined in
                                       Section 3(a)(19) of the Act

                        (d)    (  )    Investment Company registered
                                       under Section 8 of the Investment
                                       Company Act

                        (e)    (X)     Investment Adviser registered
                                       under Section 203 of the Investment
                                       Advisors Act of 1940

                        (f)    (  )    Employee Benefit Plan, Pension
                                       Fund which is subject to the
                                       Provisions of the Employee Retire-
                                       ment Income Security Act of 1974
                                       or Endowment Fund; see 'SS'240.13d-1
                                       (b)(1)(ii)(F)

                        (g)    (  )    Parent Holding Company, in accor-
                                       dance with 'SS'240.13d-1(b)(ii)(G)
                                       (Note:  See Item 7)

                        (h)    (  )    Group in accordance with 'SS'240.13d-1
                                       (b)(1)(ii)(H)

Item 4.          Ownership.
- ------           ----------

                        (a)   Amount Beneficially owned: 2,188,700 shares

                        (b)   Percent of Class: 7.9%

                        (c)   Number of shares as to which such person has:

                              (i)   sole power to vote or to direct the vote: 0

                              (ii)  shared power to vote or to direct the vote:
                                    2,188,700

                              (iii) sole power to dispose or to direct the
                                    disposition of: 0

                              (iv)  shared power to dispose or to direct the
                                    disposition of:  2,188,700



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                                Page 5 of 6 pages

Item 5.               Ownership of Five Percent or Less of a Class
- ------                --------------------------------------------

                      If this statement is being filed to report the fact that
                      as of the date hereof the reporting person has ceased to
                      be the beneficial owner of more than five percent of the
                      class of securities, check the following ( )

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

                      A PORTION OF THE SHARES OF COMMON STOCK OF THE ISSUER
                      REPORTED HEREBY, AMOUNTING IN THE AGGREGATE TO 7.9% OF
                      SUCH SHARES OUTSTANDING, ARE HELD IN CERTAIN DISCRETIONARY
                      MANAGED ACCOUNTS OF WESTPORT ASSET MANAGEMENT, INC. (THE
                      "REPORTING PERSON"). THE REPORTING PERSON DISCLAIMS
                      BENEFICIAL OWNERSHIP OF SUCH SHARES BENEFICIALLY OWNED BY
                      SUCH PERSONS AND DISCLAIMS THE EXISTENCE OF A GROUP.

Item 7.               Identification and Classification of the Subsidiary
- ------                Which acquired the Security Being Reported on By
                      the Parent Holding Company.
                      ---------------------------------------------------

                                    N/A

Item 8.               Identification and Classification of Members of
- ------                the Group.
                      -----------------------------------------------
                                    N/A

Item 9.               Notice of Dissolution of Group.
- ------                -------------------------------
                                    N/A



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                             Page 6 of 6 pages

Item 10.              Certification
- -------               -------------

                      By signing below, I certify that, to the best of my
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.

                       Disclaimer
                       ----------

                      The undersigned expressly declares that the filing of this
Schedule 13G shall not be construed as an admission that such person is, for the
purpose of Section 13(d) or 13(g) of the Securities Act of 1934, the beneficial
owner of any securities covered by this statement.

                      Signature. After reasonable inquiry and to the best of my
                 knowledge and belief, I certify that the information set forth
                 in this statement is true, complete and correct.


Date 2/16/99

                                      WESTPORT ASSET MANAGEMENT, INC.


                                      By
                                        
                                              ANDREW J. KNUTH, CHAIRMAN

                          STATEMENT OF DIFFERENCES
                          ------------------------

The section symbol shall be expressed as..............................  'SS'




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