EXHIBIT 10(g)


                      AMENDMENT TO NOTE PURCHASE AGREEMENT
                      ------------------------------------

     This AMENDMENT to the Note Purchase Agreement (the "Amendment") is
     made and entered into as of December 20, 1993, by and among AAI
     CORPORATION, a Maryland corporation (the "Company"), and PRINCIPAL
     MUTUAL LIFE INSURANCE COMPANY ("Principal Mutual"), an Iowa
     Corporation, and amends that certain Note Purchase Agreement, dated as
     of July 15, 1992, (the "Note Purchase Agreement"), by and among the
     Company and Principal Mutual, The Travelers Insurance Company and The
     Travelers Indemnity Company of Rhode Island, (collectively, the
     "Purchasers"), relating to the issuance and sale by the Company to the
     Purchasers of $25,000,000 aggregate principal amount of its 8.65%
     Senior Notes Due 1999 (the "Notes").  Principal Mutual owns in the
     aggregate $13,000,000 principal amount of the total issue of
     $25,000,000.  United Industrial Corporation ("UIC"), the parent of
     AAI, guaranteed the payment of the Notes pursuant to the Guaranty
     Agreement, dated as of July 15, 1992.

     The Company has requested that Principal Mutual modify the Note
     Purchase Agreement by amending Section 6.8 dealing with "Restriction
     on Liens" so that the Company may be allowed to incur liens to secure
     a guarantee to Bank Leumi Trust Company of New York (the "Bank") to
     induce the Bank to provide a line of credit to Pioneer UAV, Inc., a
     joint venture, in which the Company is a 50% participant.  Principal
     Mutual has agreed to the Company's request, provided, the Company
     agrees to covenant that under no circumstances will the Notes be
     subordinate to the Company's indebtedness to the Bank.

     NOW, THEREFORE, in consideration of the premises and for other good
     and valuable consideration, the receipt and sufficiency of which are
     hereby acknowledged, the undersigned do hereby covenant and agree as
     follows:

     1.   Definitions
          -----------
          Terms used and not defined herein shall have the respective
          meanings ascribed to such terms in the Note Purchase Agreement.

     2.   Addition of Section 5.11 to the Note Purchase Agreement
          -------------------------------------------------------
          A new Section 5.11 (Affirmative Covenant) is added by inserting
          the following language:




























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          "Section 5.11 Ranking All obligations of the Company under this 
                        -------
          Agreement and the Notes constitute direct, unconditional and
          general obligations of the Company and under no circumstances
          will the obligations of the Company under this Agreement and the
          Notes rank in right of payment subordinate to the indebtedness of
          the Company to Bank Leumi Trust Company of New York."

     3.   Amendments to Section 6.8 of the Note Purchase Agreement
          --------------------------------------------------------
          3.1  The last sentence of subsection (v) of Section 6.8 of the
               Note Purchase Agreement is amended by deleting the period at
               the end thereof and inserting ";" and " in lieu thereof.

          3.2  A new subsection (vi) is added after subsection (v) by
               inserting the following language:

               "(vi) liens securing the guarantee provided by the Company
               up to a maximum of $750,000 to Bank Leumi Trust Company of
               New York to provide a line of credit to Pioneer UAV, Inc."

     4.   Representations and Warranties
          ------------------------------
          In order to induce Principal Mutual to enter into this Amendment,
          the Company represents and warrants as follows:

          4.1  The above covenant is hereby incorporated in this Amendment.

          4.2  There exists no Event of Default on the date hereof.

          4.3  The execution and delivery by the Company of this Amendment
               has been duly authorized by all necessary corporate action,
               and this Amendment constitutes a legal, valid and binding
               obligation of the Company enforceable against the Company in
               accordance with its terms.

          4.4  No dissolution proceedings with respect to the Company have
               been commenced or are contemplated, and there has been no
               material adverse change in the business, conditions, or
               operations (financial or otherwise) of the Company and its
               Subsidiaries taken as a whole, except as previously
               disclosed to Principal Mutual.
































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          4.5  Neither the execution and delivery by the Company of this
               Amendment nor compliance with the provisions hereof will
               violate any law, rule, regulation, ordinance, order, writ,
               judgment, injunction, decree or award binding on the Company
               or any charter, instrument or by-law of the Company or the
               provisions of any loan, indenture, instrument or agreement
               to which the Company is a party or is subject, or by which
               it or its property is bound, or conflicts with or
               constitutes a default hereunder.

     5.   Miscellaneous
          -------------
          5.1  The terms of this Amendment shall not operate as a waiver by
               Principal Mutual of any of the provisions of, or otherwise
               prejudice, remedies or powers under the Note Purchase
               Agreement, the Notes or applicable law and shall not operate
               as a waiver or otherwise prejudice any rights Principal
               Mutual may have against any other Person.  Except as set
               forth herein, none of the terms or provisions of either the
               Note Purchase Agreement or the Notes shall be deemed to be
               modified hereby, and each of the Note Purchase Agreement and
               the Notes, as modified herein, shall continue in full force
               and effect.

          5.2  All headings and captions preceding the text of the Sections
               of this Amendment are intended solely for convenience or
               reference and shall not constitute a part of this Amendment,
               nor shall they affect its meaning, construction or effect.

          5.3  This Amendment may be executed by the parties hereto in
               separate counterparts, each of which taken together shall
               constitute one and the same agreement.

          IN WITNESS WHEREOF, the parties hereto have caused this Amendment
     to be executed by their authorized officers as of the date first
     written above.

     PRINCIPAL MUTUAL LIFE INSURANCE COMPANY


     By:                                     
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     By:                                     
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     AAI Corporation


     By:                                     
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     Its:                                    
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