AAR CORP
SC 13G/A, 1996-01-29
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. 2)*

 
                                   AAR CORP.
- - -----------------------------------------------------------------------------
                               (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
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, NM Capital 
     Management, Inc. and John Hancock Advisers, 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, NM Capital 
     Management, Inc. and John Hancock Advisers, 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, NM Capital 
     Management, Inc. and John Hancock Advisers, 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
 
     1,327,946: 1,297,946 through its direct, wholly owned subsidiary, NM 
     Capital Management, Inc. and 30,000 through its direct, wholly-owned
     subsidiary, John Hancock Advisers, 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
 
     8.3%
- - --------------------------------------------------------------------------------
  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
 
     NM Capital Management, INc.
     I.R.S. No. 85-0268885
- - --------------------------------------------------------------------------------
 
  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
 
     New Mexico
- - --------------------------------------------------------------------------------
               5  SOLE VOTING POWER
   Number of       
    Shares         
                  635,299
              ------------------------------------------------------------------
 Beneficially  6  SHARED VOTING POWER
   Owned by        
     Each          
                  -0-
              ------------------------------------------------------------------
   Reporting   7  SOLE DISPOSITIVE POWER
    Person         
     With          
                  1,297,946
              ------------------------------------------------------------------
               8  SHARED DISPOSITIVE POWER
 
 
                  -0-
- - --------------------------------------------------------------------------------
  9  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
  
     1,297,946
- - --------------------------------------------------------------------------------
  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
 
      8.1%
- - --------------------------------------------------------------------------------
  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 wholly-owned subsidiary, The Berkeley Financial
               Group ("TBFG") and TBFG's direct, wholly-owned subsidiary, NM
               Capital Management, Inc. ("NM").

     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 02177.
               The principal business offices of TBFG is located at 101
               Huntington Avenue, Boston, Massachusetts 02199. The principal
               business office of NM is 6501 Americas Parkway, Suite 950,
               Albuquerque, NM 87110-5372.

     Item 2(c) Citizenship:
               ---------------------------
               JHMLICO, JHAM and TBFG were organized and exist under the laws
               of the Commonwealth of Massachusetts. JHSI was organized and
               exists under the laws of the State of Delaware. NM was organized
               and exists under the laws of the State of New Mexico.

     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 (S)15 of the
                                 Act.

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

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

                               PAGE 7 OF 11 PAGES







 

 



<PAGE>
 
                         (g) (X) Parent Holding Company, in accordance with
                                 (S)240.13d-1(b)(ii)(G).
 
               JHSI      (g) (X) Parent Holding Company, in accordance with
                                 (S)240.13d-1(b)(ii)(G).
 
               JHAM      (g) (X) Parent Holding Company, in accordance with
                                 (S)240.13d-1(b)(ii)(G).
 
               TBFG      (g) (X) Parent Holding Company, in accordance with
                                 (S)240.13d-1(b)(ii)(G).
               NM        (e) (X) Investment Adviser registered under (S)203  
                                 of the Investment Advisers Act of 1940.
 
     Item 4         Ownership:
                    ------------
 
               (a)  Amount Beneficially Owned: NM beneficially owns 1,297,946
                    shares of Common Stock in various advisory accounts. In
                    addition to the shares owned by NM, John Hancock Advisers,
                    Inc. ("JHA"), an Investment Adviser registered under (S)203
                    of the Investment Advisers Act of 1940 and a direct, wholly-
                    owned subsidiary of TBFG beneficially owns 30,000 shares of
                    common stock. Through their parent-subsidiary relationship
                    to NM and JHA, JHMLICO, JHSI, JHAM and TBFG have indirect,
                    beneficial ownership of these same shares.
                             
                    The JHA shares are held by the John Hancock Special Value 
                    Fund, an open-end diversified management company registered
                    under (S)8 of the Investment Company Act.  Under an  
                    Advisory Agreement dated October 1, 1993, JHA has 
                    beneficial ownership of the 30,000 shares held in the fund.
    
 
               (b)  Percent of Class:
                    ----------------
                    TBFG - 8.3%
                    NM   - 8.1%
                    JHA  -  .2%
 
               (c)  (i)   sole power to vote or to direct the vote:
                          NM           - 635,299 shares
                          JHA          -  30,000 shares

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

                    (iii) sole power to dispose or to direct the disposition of:
                          NM              - 1,297,946 shares
                          JHA             -    30,000 shares

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

     Item 5         Ownership of Five Percent or Less of a Class:
                    -------------------------------------------- 
                    Not applicable.

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

                               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 2(a), 3 and 4.

     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, 1996            Title:  Senior Vice President & Treasurer
       ----------------                 -------------------------------------



                                   JOHN HANCOCK SUBSIDIARIES, INC.

                                   By: /s/ John T. Farady
                                       --------------------------------------
                                   Name:   John T. Farady
                                        -------------------------------------
Dated: January 24, 1996            Title:  Treasurer
       ----------------                 ------------------------------------- 



                                   JOHN HANCOCK ASSET MANAGEMENT

                                   By: /s/ James H. Young
                                       --------------------------------------
                                   Name:   James H. Young
                                        -------------------------------------
Dated: January 23, 1996            Title:  Secretary
       ----------------                 -------------------------------------



                                   THE BERKELEY FINANCIAL GROUP

                                   By: /s/ Susan S. Newton
                                       --------------------------------------
                                   Name:   Susan S. Newton
                                        -------------------------------------
Dated: January 24, 1996            Title:  Vice President 
       ----------------                 -------------------------------------


                                   NM CAPITAL MANAGEMENT, INC.

                                   By: /s/ Susan S. Newton
                                       --------------------------------------
                                   Name:   Susan S. Newton
                                        -------------------------------------
Dated: January 24, 1996            Title:  Assistant Secretary 
       ----------------                 -------------------------------------


                              PAGE 10 OF 11 PAGES
<PAGE>
 
                                                        EXHIBIT A

                             JOINT FILING AGREEMENT
                             ----------------------


     John Hancock Mutual Life Insurance Company, John Hancock Subsidiaries,
Inc., The Berkeley Financial Group and NM Capital Management, Inc. agree that
the Schedule 13G Amendment 2, 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, 1996          Title: Senior Vice President & Treasurer
       -------------------              ----------------------------------------



                                  JOHN HANCOCK SUBSIDIARIES, INC.

                                  By:    /s/ John T. Farady
                                      ------------------------------------------
                                  Name:  John T. Farady
                                       -----------------------------------------
Dated:  January 24, 1996          Title: Treasurer
       -------------------              ----------------------------------------

                                  JOHN HANCOCK ASSET MANAGEMENT

                                  By:    /s/ James H. Young
                                      ------------------------------------------
                                  Name:  James H. Young
                                       -----------------------------------------
Dated:  January 23, 1996          Title: Secretary
       -------------------              ----------------------------------------

                                  THE BERKELEY FINANCIAL GROUP

                                  By:    /s/ Susan S. Newton
                                      ------------------------------------------
                                  Name:  Susan S. Newton
                                       -----------------------------------------
Dated:  January 24, 1996          Title: Vice President
       -------------------              ----------------------------------------

                                  NM CAPITAL MANAGEMENT, INC.

                                  By:    /s/ Susan S. Newton
                                      ------------------------------------------
                                  Name:  Susan S. Newton
                                       -----------------------------------------
Dated:  January 24, 1996          Title: Assistant Secretary
       -------------------              ----------------------------------------

                              PAGE 11 OF 11 PAGES


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