SECURITY AGREEMENT


     THIS AGREEMENT is made as of the _______ day of ________________,
     1994, by and among FIRST FIDELITY BANK, NATIONAL ASSOCIATION, as Agent
     (in such capacity, "Secured Party") for the Lenders, the Issuing Bank
     and the Noteholders (as those terms are hereinafter defined), and the
     other corporations which have executed this Agreement (individually
     and collectively, "Debtors").


              SECTION 1.  CONSTRUCTION OF AGREEMENT AND DEFINITIONS


     Unless the context otherwise requires, all of the terms used herein
     without definition which are defined by the Maryland Uniform
     Commercial Code shall have the meanings assigned to them by the
     Maryland Uniform Commercial Code except to the extent varied by this
     Agreement.  Unless the context otherwise requires, all capitalized
     terms hereinbefore or hereinafter used in this Agreement without
     definition shall have the meanings assigned to such terms in the
     Credit Agreement.  The phrases "satisfactory to Secured Party,"
     "acceptable to Secured Party" and similar phrases shall mean
     satisfactory or acceptable to Secured Party, in Secured Party's
     discretion exercised in good faith.  The use of the singular herein
     shall also refer to the plural and vice versa, and the use herein of
     any gender, including the neuter, shall also refer to each of the
     other genders, including the neuter.  The captions and headings
     contained in this Agreement are for convenience of reference only and
     shall not affect the meaning, or the construction or interpretation,
     of this Agreement.  In addition to terms defined elsewhere in this
     Agreement, the following terms shall have the following meanings when
     used herein:

               "BORROWER" shall mean AAI Corporation, a Maryland
     corporation.

               "COLLATERAL" shall mean:  (a) all Receivables, General
     Intangibles, Inventory, Equipment and Computer Hardware and Software,
     each Cash Collateral Account and, in addition, all other property of
     each of Debtors in which Secured Party has, or may in the future
     acquire or be granted, a security interest hereunder; (b) all amounts
     now or in the future owed by any of Secured Party, Lenders, Issuing
     Bank or Noteholders to any of Debtors and all property and funds of
     each of Debtors (including deposit accounts, certificates of deposit,
     and investments made or managed by Secured Party on behalf of any of
     Debtors), now owned or hereafter acquired by each of Debtors and now
     or hereafter in the possession or control of any of Secured Party,
     Lenders, Issuing Bank or Noteholders; (c) all present and future 





















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     substitutions, replacements, appurtenances, accessories, accessions
     and materials and supplies relating to any of the foregoing; (d) all
     present and future books and records of each of Debtors in any form,
     in or on any media, including data processing materials in any form
     (including software, tapes, disks and the like), whether in the
     possession of any of Debtors or any other person; and (e) all present
     and future proceeds and products of all of the foregoing in any form
     whatsoever and all rights, including rights to the payment of money
     for any reason, arising on account of any sale, assignment, lease,
     rental, license, exchange, liquidation, condemnation, taking, theft or
     any disposition of any nature of, or any damage or casualty to, or any
     loss with respect to, any of the foregoing or any rights or interests
     of any of Debtors in any of the foregoing, including, without
     limitation, cash proceeds (including all payments under any
     indemnities, warranties or guaranties payable with respect to any of
     the foregoing), non-cash proceeds and proceeds acquired with cash
     proceeds, whether any such proceeds constitute consumer goods, farm
     products, equipment, inventory, documents of title, chattel paper,
     accounts, instruments or general intangibles, and all proceeds of
     insurance policies insuring any of the foregoing or any risks to any
     of Debtors associated with any of the foregoing.

               "COLLATERAL LOCATIONS" shall mean the locations identified
     on the Collateral Locations Exhibit attached hereto.

               "COMPUTER HARDWARE AND SOFTWARE" shall mean:  (a) all of
     Debtors' computer and other electronic data processing hardware,
     integrated computer systems, central processing units, memory units,
     display terminals, printers, features, computer elements, card
     readers, tape drives, hard and soft disk drives, cables, electrical
     supply hardware, generators, power equalizers, accessories and all
     peripheral devices and other related computer hardware, whether now
     owned, licensed or leased or hereafter acquired by any of Debtors;
     (b) all software programs, including source codes and object codes,
     whether now owned, licensed or leased or hereafter acquired by any of
     Debtors, designed for use or used on the equipment described in the
     preceding clause (a), and all firmware associated therewith, whether
     now owned, licensed or leased or hereafter acquired by any of Debtors;
     and (c) all present and future manuals and other written materials and
     documentation (and packaging thereof or relating thereto) for such
     equipment, software or firmware, whether now owned, licensed or leased
     or hereafter acquired by any of Debtors.

               "COPYRIGHT RIGHTS" shall mean all right, title and interest
     of each of Debtors, whether now owned or existing or hereafter
     acquired or arising, in and to all domestic and foreign copyrights,
     copyright registrations and copyright applications, whether or not
     registered or filed with any Governmental Authority, together with
     (a) all renewals thereof, (b) all



















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     present and future rights of each of Debtors under all present and
     future license agreements relating thereto, whether any of Debtors is
     licensee or licensor thereunder, (c) all income, royalties, damages
     and payments now or hereafter due and/or payable to any of Debtors
     thereunder or with respect thereto, including, without limitation,
     damages and payments for past, present or future infringements
     thereof, (d) all present and future claims of each of Debtors, causes
     of action of each of Debtors and rights of each of Debtors to sue for
     past, present or future infringements thereof, and (e) all rights
     corresponding thereto throughout the world.

               "CREDIT AGREEMENT" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Credit Agreement of even date herewith
     among Borrower, Secured Party, Lenders and Issuing Bank.

               "DEBTOR DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, this Agreement and any additional Noteholder Documents
     executed or assumed by any of Debtors, the Lender Guaranty and any
     additional Lender Documents executed or assumed by any of Debtors.

               "DEBTOR NOTICE ADDRESS" shall mean York Road and Industry
     Lane, Hunt Valley, Maryland 21030.

               "DEBTOR OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, increased,
     refinanced, consolidated or replaced from time to time, all present
     and future obligations, indebtedness and liabilities of each of
     Debtors to each of Lenders, Issuing Bank and Noteholders of every kind
     and nature evidenced by or arising under or in connection with the
     Debtor Documents (including, without limitation, all principal
     amounts, interest charges, fees, commissions and all other charges and
     sums, as well as all costs and expenses, including reasonable
     attorneys' fees and expenses, payable or reimbursable by any of
     Debtors under or pursuant to the Debtor Documents), whether direct or
     indirect, contingent or noncontingent, matured or unmatured, accrued
     or not accrued, liquidated or unliquidated, whether arising in
     contract, tort or otherwise, whether the liability of any of Debtors
     with respect thereto is joint or several or both, and whether or not
     any instrument or agreement relating thereto specifically refers to
     this Agreement, including, without limitation, all claims of Lenders,
     Issuing Bank and Noteholders against each of Debtors arising or re-
     arising on account of or as a result of any payment made by any of
     Debtors or any other person with respect to any obligations included
     in this definition which is rescinded or recovered from or restored or
     returned by any of Lenders, Issuing Bank or Noteholders under
     authority of any law, rule, regulation,




















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     order of court or governmental agency, or in connection with any
     compromise or settlement relating thereto or relating to any pending
     or threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.

               "EQUIPMENT" shall mean:  (a) all equipment of each of
     Debtors of every type and description, now owned and hereafter
     acquired and wherever located, including, without limitation, all
     machinery, vehicles and other rolling stock, furniture, furnishings,
     tools, dies, leasehold improvements, fixtures, and materials and
     supplies relating to any of the foregoing; (b) all present and future
     documents of title and trust receipts relating to any of the
     foregoing; (c) all present and future rights, claims and causes of
     action of each of Debtors in connection with purchases by any of
     Debtors of (or contracts for the purchase by any of Debtors of), or
     warranties relating to, or damages to, goods held or to be held by any
     of Debtors as equipment; (d) all present and future warranties,
     manuals and other written materials (and packaging thereof or relating
     thereto) relating to any of the foregoing; and (e) all present and
     future rights, claims and causes of action of each of Debtors in
     connection with any agreements pursuant to which any suppliers,
     manufacturers or other persons have agreed or may agree, conditionally
     or otherwise, to purchase or repurchase from any of Debtors, in bulk
     or otherwise, any goods held or to be held by any of Debtors as
     equipment.

               "EVENT OF DEFAULT" shall mean an "Event of Default," as
     defined in the Credit Agreement, or an "Event of Default," as defined
     in the Note Purchase Agreement.

               "EXCLUDED UIC-DEL NOTE" shall mean that certain Promissory
     Note dated February 26, 1985, issued by Smith & Nephew Investment
     Group, Ltd., a Delaware corporation, to UIC - DEL. Corporation in the
     original principal amount of $42,699,384.00 and having a present
     unpaid principal balance of $8,539,876.80.

               "GENERAL INTANGIBLES" shall mean all present and future
     personal property, interests and rights of each of Debtors (including
     things in action), other than goods, accounts, chattel paper,
     documents, instruments and money, but including, without limitation: 
     (a) all Intellectual Property; (b) all uncertificated capital stock
     and other securities, partnership interests, joint venture interests
     and other investments and similar interests of each of Debtors,
     whether now owned or hereafter acquired by any of Debtors, together
     with all present and future rights, titles, interests, powers,
     authorities, options, warrants, privileges and benefits thereof or
     accruing or in any way relating thereto, and all present and future
     claims, rights, titles and interests of each of Debtors in and to all
     present and future payments, receipts, collections, profits,


















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     revenues, dividends, distributions, surplus, income, entitlements,
     exchanges, benefits and other proceeds and avails thereof or in any
     way relating thereto; and (c) all present and future customer lists of
     each of Debtors. 

               "GOOD FAITH" shall mean, with respect to a determination,
     request or other action to be made or taken by Secured Party "in good
     faith," that Secured Party shall make or take such determination,
     request or other action honestly and not maliciously.

               "INTELLECTUAL PROPERTY" shall mean:  (a) all Copyright
     Rights; (b) all Patent Rights; (c) all Trademark Rights; (d) all
     License Rights; (e) all goodwill of each of Debtors; (f) all present
     and future trade secrets of each of Debtors; and (g) all other present
     and future intellectual property of each of Debtors.

               "INTERCREDITOR AGREEMENT" shall mean, as the same may be
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Intercreditor Agreement of even date
     herewith among Secured Party, Lenders, Issuing Bank and Noteholders.

               "INVENTORY" shall mean:  (a) all inventory of each of
     Debtors of every type and description, now owned and hereafter
     acquired and wherever located, including, without limitation, raw
     materials, work in process, finished goods, goods returned or
     repossessed, and goods held for demonstration, marketing or similar
     purposes; (b) all present and future materials and supplies of each of
     Debtors used, usable or consumed in the course of business of each of
     Debtors, whether relating to the manufacture, assembly, installation,
     repair, packaging, packing or shipment of goods by any of Debtors, or
     relating to advertising or any other aspect of any business of any of
     Debtors; (c) all present and future property of each of Debtors in or
     on which any of the foregoing is stored or maintained; (d) all present
     and future warranties, manuals and other written materials (and
     packaging thereof or relating thereto) relating to any of the
     foregoing; (e) all present and future documents of title and trust
     receipts relating to any of the foregoing; (f) all present and future
     customer lists of each of Debtors; (g) all present and future rights
     of each of Debtors in connection with goods consigned to or by any of
     Debtors; (h) all present and future rights of each of Debtors as an
     unpaid seller of goods, including rights of stoppage in transit,
     detinue and reclamation; (i) all present and future rights, claims and
     causes of action of each of Debtors in connection with purchases by
     any of Debtors of (or contracts for the purchase by any of Debtors
     of), or warranties relating to, or damages to, goods held or to be
     held by any of Debtors as inventory; and (j) all present and future
     rights, claims and causes of action of each of Debtors in





















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     connection with any agreements pursuant to which any suppliers,
     manufacturers or other persons have agreed or may agree, conditionally
     or otherwise, to purchase or repurchase from any of Debtors, in bulk
     or otherwise, any goods held or to be held by any of Debtors as
     inventory.

               "ISSUING BANK" shall mean the person from time to time party
     to the Credit Agreement as "Issuing Bank."

               "LENDER DOCUMENTS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, the Credit Agreement, the Revolving Credit Notes, the
     Borrower Security Agreement, the Borrower Pledge Agreement, the Deed
     of Trust, the Lender Guaranty, the UIC Pledge Agreement, the UIC
     Subordination Agreement, the UIC-DEL Subordination Agreement, the L/C
     Agreements, this Agreement, and any and all other agreements,
     contracts, promissory notes and other instruments, security
     agreements, assignments, pledge agreements, indemnification
     agreements, mortgages, deeds of trust, leases, guaranties and other
     documents now or hereafter existing and evidencing, securing (directly
     or indirectly), guaranteeing (or in effect guaranteeing) or
     indemnifying (or in effect indemnifying) any of Lenders or Issuing
     Bank with respect to, any of the aforementioned documents or any
     obligations of any person to any of Lenders or Issuing Bank
     thereunder.

               "LENDER GUARANTY" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented or replaced from
     time to time, that certain Guaranty of even date herewith executed and
     delivered by Debtors and UIC in favor of Secured Party, Lenders and
     Issuing Bank.

               "LENDER OBLIGATIONS" shall mean, as the same may be waived,
     amended, modified, extended, renewed, supplemented, refinanced,
     consolidated or replaced from time to time, all present and future
     Revolving Credit Loans, L/C Reimbursement Obligations and other
     obligations, indebtedness and liabilities of Borrower to each of
     Lenders and Issuing Bank arising under, evidenced by or in connection
     with the Credit Agreement or the other Lender Documents, including,
     without limitation, all principal amounts, including future advances,
     indemnification obligations, interest charges, fees, premiums,
     commissions and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower under or in connection with the Credit
     Agreement or the other Lender Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing, and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by

















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     Borrower or any other person with respect to any obligations included
     in this definition which is rescinded or recovered from any of Lenders
     or Issuing Bank or restored or returned by any of Lenders or Issuing
     Bank under authority of any law, rule, regulation, order of court or
     Governmental Authority, or in connection with any compromise or
     settlement relating thereto or relating to any pending or threatened
     action, suit or proceeding relating thereto, whether arising out of
     any proceedings under the United States Bankruptcy Code or otherwise. 


               "LENDERS" shall mean the persons from time to time parties
     to the Credit Agreement as "Lenders."

               "LICENSE RIGHTS" shall mean all present and future licenses
     and license agreements of each of Debtors, and all rights of each of
     Debtors under or in connection therewith, whether any of Debtors is
     licensee or licensor thereunder, including, without limitation, any
     present or future franchise agreements under which any of Debtors is
     franchisee or franchisor, together with (a) all renewals thereof,
     (b) all income, royalties, damages and payments now or hereafter due
     and/or payable to each of Debtors thereunder or with respect thereto,
     including, without limitation, damages and payments for past, present
     or future infringements thereof, (c) all claims, causes of action and
     rights to sue for past, present or future infringements thereof, and
     (d) all rights corresponding thereto throughout the world.

               "NOTE PURCHASE AGREEMENT" shall mean, as the same has been
     or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Note Purchase
     Agreement dated July 15, 1992, among Borrower and Noteholders.

               "NOTEHOLDER DOCUMENTS" shall mean, as the same have been or
     may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, the Note Purchase
     Agreement, the Noteholder Notes, the UIC Noteholder Guaranty and any
     and all other agreements, contracts, promissory notes and other
     instruments, security agreements, assignments, pledge agreements,
     indemnification agreements, mortgages, deeds of trust, leases,
     guaranties and other documents now or hereafter existing and
     evidencing, securing, directly or indirectly, guaranteeing (or in
     effect guaranteeing) or indemnifying (or in effect indemnifying)
     Noteholders with respect to, any of the aforementioned documents or
     any obligations of any person to Noteholders thereunder.

               "NOTEHOLDER NOTES" shall mean, as the same have been or may
     hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by




















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     Borrower to TRAL & CO, nominee of The Travelers Insurance Company,
     pursuant to the Note Purchase Agreement in the original principal
     amount of $9,000,000.00, that certain 8.65% Senior Note Due July 31,
     1999, dated August 11, 1992, issued by Borrower to TRAL & CO, nominee
     of The Travelers Indemnity Company of Rhode Island, pursuant to the
     Note Purchase Agreement in the original principal amount of
     $3,000,000.00 and assigned by The Travelers Indemnity Company of Rhode
     Island to The Travelers Insurance Company, that certain 8.65% Senior
     Note Due July 31, 1999, dated August 11, 1992, issued by Borrower to
     Principal Mutual Life Insurance Company pursuant to the Note Purchase
     Agreement in the original principal amount of $10,000,000.00, and that
     certain 8.65% Senior Note Due July 31, 1999, dated August 11, 1992,
     issued by Borrower to Principal Mutual Life Insurance Company pursuant
     to the Note Purchase Agreement in the original principal amount of
     $3,000,000.00.

               "NOTEHOLDER OBLIGATIONS" shall mean, as the same may have
     been or may hereafter be waived, amended, modified, extended, renewed,
     supplemented, refinanced, consolidated or replaced from time to time,
     all present and future obligations, indebtedness and liabilities of
     Borrower to each of Noteholders arising under, evidenced by or in
     connection with the Noteholder Documents, including, without
     limitation, principal amounts (but not including any additional loans
     or advances by Noteholders to Borrower), interest charges, fees,
     premiums and all other charges and sums, as well as all costs and
     expenses, including reasonable attorneys' fees and expenses, payable
     or reimbursable by Borrower to each of Noteholders under or in
     connection with the Noteholder Documents, whether direct or indirect,
     contingent or noncontingent, matured or unmatured, accrued or not
     accrued, liquidated or unliquidated, as well as all claims, demands,
     actions, causes of action and judgments arising from or relating to
     any of the foregoing and including, without limitation, all claims
     against Borrower arising or re-arising on account of or as a result of
     any payment made by Borrower or any other person with respect to any
     obligations included in this definition which is rescinded or
     recovered from any of Noteholders or restored or returned by any of
     Noteholders under authority of any law, rule, regulation, order of
     court or Governmental Authority, or in connection with any compromise
     or settlement relating thereto or relating to any pending or
     threatened action, suit or proceeding relating thereto, whether
     arising out of any proceedings under the United States Bankruptcy Code
     or otherwise.  

               "NOTEHOLDERS" shall mean, collectively, Principal Mutual
     Life Insurance Company, an Iowa corporation, and The Travelers
     Insurance Company, a Connecticut corporation.

               "PATENT RIGHTS" shall mean all right, title and interest of
     each of Debtors, whether now owned or existing or hereafter acquired
     or arising, in and to all United States and


















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     foreign patents, and pending and abandoned United States and foreign
     patent applications, including, without limitation, the inventions and
     improvements described or claimed therein, together with (a) any
     reissues, divisions, continuations, certificates of re-examination,
     extensions and continuations-in-part thereof, (b) all present and
     future rights of each of Debtors under all present and future license
     agreements relating thereto, whether any of Debtors is licensee or
     licensor thereunder, (c) all income, royalties, damages and payments
     now or hereafter due and/or payable to each of Debtors thereunder or
     with respect thereto, including, without limitation, damages and
     payments for past, present or future infringements thereof, (d) all
     present and future claims of each of Debtors, causes of action of each
     of Debtors and rights of each of Debtors to sue for past, present or
     future infringements thereof, and (e) all rights corresponding thereto
     throughout the world.

               "PERSON" shall mean any individual, corporation, limited
     liability company, partnership, joint venture, association, trust,
     business trust, Governmental Authority (or subdivision, agency or
     department thereof) or other entity of any kind.

               "RECEIVABLES" shall mean:  (a) all present and future
     accounts, contract rights, receivables, chattel paper, documents and
     promissory notes and other negotiable and non-negotiable instruments
     of each of Debtors, not including the Excluded UIC-DEL Note but
     including, without limitation, that certain Mortgage Note dated
     June 1, 1994, executed and delivered in favor of AAI Microflite
     Simulation International Corporation by JMI, a New York partnership,
     and Broome County Industrial Development Agency in the original
     principal amount of One Million Two Hundred Thousand Dollars
     ($1,200,000.00), and all certificated securities and other
     certificates evidencing capital stock of any person or any other
     ownership, equity or other rights in any person or property, together
     with all present and future rights, titles, interests, powers,
     authorities, options, warrants, privileges and benefits thereof or
     accruing or in any way relating thereto, and all present and future
     claims, rights, titles and interests of each of Debtors in and to all
     present and future payments, receipts, collections, profits, revenues,
     dividends, distributions, surplus, income, entitlements, exchanges,
     benefits and other avails thereof or in any way relating thereto;
     (b) all present and future tax refunds of each of Debtors and all
     present and future rights of each of Debtors to refunds or returns of
     prepaid expenses, including unearned insurance premiums; (c) all
     present and future cash of each of Debtors; (d) all present and future
     proceeds of Revolving Credit Loans; (e) all deposit accounts now or
     hereafter maintained or established by, for or on behalf of each of
     Debtors with any bank or other institution, and all balances of funds
     now or hereafter on deposit in all such accounts, including, without
     limitation, all checking accounts,



















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     collection accounts, lockbox accounts, disbursement accounts,
     concentration accounts and all other deposit accounts of every kind
     and nature; (f) all present and future judgments, orders, awards and
     decrees in favor of any of Debtors and causes of action in favor of
     any of Debtors; (g) all present and future claims, rights of
     indemnification and other rights of each of Debtors under or in
     connection with any contracts or agreements to which any of Debtors is
     or becomes a party or third party beneficiary; (h) all rights and
     claims of each of Debtors with respect to any deposits of money or
     other property made with any lessors of any property, insurers,
     bonding agents or any other persons; (i) all present and future rights
     and claims which any of Debtors may now or hereafter have under any
     insurance policies, contracts or coverages now or hereafter in effect;
     (j) all goods previously or hereafter returned, repossessed or stopped
     in transit, the sale, lease or other disposition of which contributed
     to the creation of any account, instrument or chattel paper of any of
     Debtors; (k) all present and future rights of each of Debtors as an
     unpaid seller of goods, including rights of stoppage in transit,
     detinue and reclamation; (l) all rights which any of Debtors may now
     or at any time hereafter have, by law or agreement, against any
     account debtor or other obligor of any of Debtors, and all rights,
     liens and security interests which any of Debtors may now or at any
     time hereafter have, by law or agreement, against any property of any
     account debtor or other obligor of any of Debtors; (m) all present and
     future interests and rights of any of Debtors, including rights to the
     payment of money, under or in connection with all present and future
     leases and subleases of real or personal property to which any of
     Debtors is a party, as lessor, sublessor, lessee or sublessee; and
     (n) all present and future contingent and noncontingent rights of each
     of Debtors to the payment of money for any reason whatsoever, whether
     arising in contract, tort or otherwise, whether or not such rights are
     otherwise included in this definition.

               "SECURED OBLIGATIONS" shall mean, collectively, the Lender
     Obligations, the Noteholder Obligations and the Debtor Obligations.

               "SECURED PARTY NOTICE ADDRESS" shall mean 123 South Broad
     Street, Philadelphia, Pennsylvania 19109.

               "TRADEMARK RIGHTS" shall mean all right, title and interest
     of each of Debtors, whether now owned or existing or hereafter
     acquired or arising, in and to all domestic and foreign servicemarks,
     servicemark registrations, servicemark applications, trademarks,
     trademark registrations, trademark applications and trade names,
     whether or not registered or filed with any Governmental Authority,
     together with (a) all renewals thereof, (b) all present and future
     rights of each of Debtors under all present and future license
     agreements relating thereto,




















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     whether any of Debtors is licensee or licensor thereunder, (c) all
     income, royalties, damages and payments now or hereafter due and/or
     payable to each of Debtors thereunder or with respect thereto,
     including, without limitation, damages and payments for past, present
     or future infringements thereof, (d) all present and future claims of
     each of Debtors, causes of action of each of Debtors and rights of
     each of Debtors to sue for past, present or future infringements
     thereof, and (e) all rights corresponding thereto throughout the
     world.

               "UIC NOTEHOLDER GUARANTY" shall mean, as the same may have
     been or may hereafter be waived, amended, modified, extended, renewed,
     supplemented or replaced from time to time, that certain Guaranty
     Agreement dated July 15, 1992, executed and delivered by UIC in favor
     of Noteholders.


                  SECTION 2.  SECURITY INTEREST AND COLLATERAL


     2.1Grant of Security Interest.  As security for the Secured
        --------------------------
     Obligations, each of Debtors hereby grants to Secured Party, for the
     ratable benefit of Lenders, Issuing Bank and Noteholders according to
     the provisions of this Agreement and the Intercreditor Agreement, a
     lien and continuing security interest in, and pledges and assigns to
     Secured Party, for the ratable benefit of Lenders, Issuing Bank and
     Noteholders according to the provisions of this Agreement and the
     Intercreditor Agreement, the Collateral.  Even if any of the Secured
     Obligations shall at any time or from time to time be paid in full,
     Secured Party's security interest shall continuously exist until all
     of the Lender Obligations and all of the Debtor Obligations to each
     Lender and Issuing Bank have been paid in full and there exists no
     commitment by any of Lenders or Issuing Bank which could give rise to
     any Lender Obligations.

               2.2 Notices, Additional Documents.  Each of Debtors agrees
                   -----------------------------
     to execute and deliver to Secured Party, or cause to be executed and
     delivered to Secured Party, from time to time promptly after request
     by Secured Party and in form and content satisfactory to Secured
     Party, such security agreements, financing statements, amendments of
     financing statements, assignments of financing statements, security
     interest filing statements, mortgages, deeds of trust, assignments,
     notices, consents and other documents as Secured Party may request in
     good faith in order to confirm, supplement, preserve, protect or
     perfect, or to maintain the perfection of, Secured Party's security
     interest in the Collateral and Secured Party's rights under this
     Agreement.  If any Intellectual Property, or any interest therein,
     shall, to the knowledge of any of Debtors, become the subject of any
     application, registration or other filing with any Governmental
     Authority, each of such Debtors
















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     agrees to notify Secured Party thereof within fifteen (15) Business
     Days after any such filing.  If any Receivable, to the knowledge of
     any of Debtors, arises out of a contract with the United States of
     America or any state, county, municipality or other Governmental
     Authority, or any department or agency thereof, each of such Debtors
     agrees to notify Secured Party thereof within ten (10) Business Days
     after execution of such contract and each of Debtors, if requested by
     Secured Party, agrees to execute and deliver to Secured Party, or
     cause to be executed and delivered to Secured Party, from time to time
     promptly after request by Secured Party and in form and content
     satisfactory to Secured Party, such agreements, notices, consents,
     assignments, acknowledgments and other documents as Secured Party may
     request in good faith, and to do such other things as Secured Party
     may request in good faith, in order that all sums due and to become
     due to Debtors under or in connection with such contract shall be duly
     assigned and paid to Secured Party in accordance with the Federal
     Assignment of Claims Act an/or any other laws, rules and regulations
     relating to the assignment or payment of such contract and sums.

               2.3 Additional Warranties, Agreements Concerning Collateral.
                   -------------------------------------------------------
     Each of Debtors warrants and agrees that:  (a) no financing statement,
     mortgage, deed of trust, assignment, notice of lien or other security
     document publicizing a security interest in or lien upon any of the
     Collateral is or will be on file in any recording or filing office,
     except for financing statements or other security documents
     publicizing Permitted Liens (other than liens for taxes) or security
     interests or other liens with respect to which effective and
     recordable termination statements or other releases have been
     delivered to Secured Party, and the Collateral is and shall remain
     free and clear of all Liens except for Permitted Liens; (b) no
     Intellectual Property of any of Debtors is the subject of any
     application, registration or other filing with any Governmental
     Authority (other than foreign Governmental Authorities), including the
     United States Patent and Trademark Office and the United States
     Copyright Office, except as set forth on the Intellectual Property
     Exhibit attached hereto; (c) each of Debtors will not, without Secured
     Party's prior written consent, sell, assign, transfer, convey or
     lease, or suffer or permit to occur any sale, assignment, transfer,
     conveyance or lease of, any of the Collateral, or any interest
     therein, except for transactions in the ordinary course of business
     and except for transactions expressly permitted by the Credit
     Agreement; (d) except as otherwise heretofore disclosed to Secured
     Party in writing and except for (i) vehicles of Debtors,
     (ii) Collateral in transit to Debtors or to job sites of Debtors,
     (iii) Collateral at job sites of Debtors, and (iv) mobile goods of a
     type normally used in more than one jurisdiction, all of the tangible
     Collateral not in Secured Party's possession is located at the
     Collateral Locations and, unless Secured Party shall consent otherwise
     in writing,


















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     shall remain located at the Collateral Locations; (e) in the case of
     any item of Equipment or Inventory having a fair market value of Five
     Hundred Thousand Dollars ($500,000.00) or more which is located at any
     location or locations other than the Collateral Locations for a period
     of four (4) months or more, keep Secured Party informed at all times
     of the location of such Equipment or Inventory; (f) each of Debtors
     will not, without Secured Party's prior written consent, store or
     place any Collateral with any warehouseman, artisan, processor,
     contractor or bailee, except in the ordinary course of business of
     Debtors as now being conducted; (g) each of Debtors will use prudent
     business judgment in extending credit to account debtors and other
     customers of Debtors; (h) each of Debtors will not permit, consent to
     or agree to, without Secured Party's prior written consent, any
     material extension, modification or compromise of any kind with
     respect to any Receivable, other than in the ordinary course of
     business of Debtors; (i) whenever requested by Secured Party and
     periodically if Secured Party shall so request, each of Debtors will
     promptly deliver to Secured Party, with such indorsements and/or
     assignments as Secured Party may from time to time request in good
     faith, all promissory notes and other instruments, certificates,
     chattel paper, guaranties and documents of title, as well as other
     documents requested by Secured Party, previously or hereafter coming
     into the possession or control of such Debtor and constituting,
     evidencing, securing, guaranteeing or otherwise relating to, any of
     the Collateral or proceeds of any of the Collateral; (j) no check,
     draft, money order or other item of payment made or applied on account
     of any of the Obligations shall constitute a final payment to Secured
     Party unless and until the item of payment shall be honored and
     finally paid to Secured Party in immediately available funds; and
     (k) a carbon, photographic or other reproduction of this Agreement or
     any financing statement signed by any of Debtors in connection with
     this Agreement shall be sufficient as a financing statement.

               2.4 Collateral Collections.  Secured Party shall have the
                   ----------------------
     right at any time and from time to time, at its option:  (a) to
     require any or all of Debtors to deposit in a designated Cash
     Collateral Account, not later than the second Business Day following
     the day on which the same are received, all cash, checks, drafts,
     money orders and other items of payment constituting Collateral, or
     collections or other proceeds of Collateral; and/or (b) to notify,
     and/or to require any or all of Debtors to notify, any or all account
     debtors and other obligors of any or all of Debtors in connection with
     any or all accounts, promissory notes or other instruments,
     guaranties, chattel paper, security agreements, contract rights, tax
     refunds or other Receivables or General Intangibles of any of Debtors,
     or in connection with any or all other obligations, indebtedness or
     liabilities payable to any of Debtors, to make payments thereon
     directly to Secured Party or in care of a post office lockbox which
     shall be maintained by Secured Party, subject to Secured


















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     Party's customary arrangements and charges therefor as established by
     Secured Party from time to time and which shall be under the exclusive
     control of Secured Party, which payments shall be deposited by Secured
     Party in a Cash Collateral Account.  Subject to applicable agreements
     and law, Secured Party shall have the right to apply funds on deposit
     in any Cash Collateral Account from time to time to such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     may determine in its discretion.  Secured Party shall have the right
     to indorse the name or names of any or all of Debtors on any
     promissory notes or other instruments, acceptances, checks, drafts,
     money orders or other items of payment constituting Collateral, or
     collections or other proceeds of Collateral, that may come into
     Secured Party's possession or control from time to time.  Secured
     Party shall also have the right to send, or to require any or all of
     Debtors to send, to account debtors and other obligors of any or all
     of Debtors from time to time requests for verification of accounts and
     other amounts which may be due to any or all of Debtors.

               2.5 Insurance Proceeds.  Each of Debtors hereby assigns to
                   ------------------
     Secured Party all proceeds of all insurance policies and coverages
     insuring any of the Collateral or any risks associated with any of the
     Collateral.  After the occurrence and during the continuance of a
     Default or an Event of Default, each of Debtors authorizes and directs
     each insurance company to pay all such proceeds directly and solely to
     Secured Party and not to any of Debtors and Secured Party jointly, and
     authorizes and empowers Secured Party to adjust or compromise any loss
     under such policies, to collect and receive all such proceeds, and,
     for those purposes, to execute and indorse in the name of any or all
     Debtors all proofs of loss, drafts, checks and any other documents or
     instruments, and any persons making payments to Secured Party under
     the terms of this provision are hereby relieved absolutely from any
     obligation or responsibility to see to the application of any sums so
     paid, which sums, after deduction of all costs and expenses (including
     reasonable attorneys' fees) paid or incurred by Secured Party in the
     collection and handling thereof, may be applied, at Secured Party's
     option but subject to applicable law and agreements, either toward
     replacing or restoring the Collateral, in a manner and on terms
     satisfactory to Secured Party, or as a credit against such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     shall determine in its discretion.  Except when a Default or an Event
     of Default shall have occurred and be continuing, Debtors shall have
     the right to collect the proceeds of any such policies, provided that
     all such proceeds collected by Debtors are either applied promptly by
     Debtors to repairing, replacing or restoring the Collateral, in a
     manner and on terms satisfactory to Secured Party, or paid promptly by
     Debtors to Secured Party for application against such of the
     Obligations, whether matured or unmatured, as Secured Party shall




















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     determine in its discretion but subject to applicable law and
     agreements.


































































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                               SECTION 3.  DEFAULT


     3.1Remedies.  Upon and at any time after the occurrence and during the
        --------
     continuance of any Event of Default, Secured Party may, without notice
     or demand, exercise in any jurisdiction in which enforcement hereof is
     sought, the following rights and remedies, in addition to all other
     rights and remedies available to Secured Party, Lenders, Issuing Bank
     and Noteholders under the Lender Documents and the Noteholder
     Documents, the rights and remedies of a secured party under the
     Uniform Commercial Code and all other rights and remedies available to
     Secured Party under law, all such rights and remedies being cumulative
     and enforceable alternatively, successively or concurrently:  (a) take
     exclusive possession of any or all of the Collateral from time to time
     and/or place a custodian in exclusive possession of any or all of the
     Collateral from time to time and, so far as any of Debtors may give
     authority therefor, enter upon any premises on which any of the
     Collateral may be situated and remove the same therefrom, each of
     Debtors hereby waiving any and all rights to prior notice and to
     judicial hearing with respect to repossession of Collateral, and/or
     require any of Debtors, at Debtors' expense, to assemble and deliver
     any or all of the Collateral to such place or places as Secured Party
     may reasonably request; (b) enforce the liens and security interests
     granted to Secured Party hereunder by collecting or liquidating all or
     any part of the Collateral or selling, assigning, leasing, renting,
     licensing or otherwise disposing of all or any part of the Collateral
     or any interest therein, in one or more parcels, at the same or
     different times, at public or private sale or disposition, or
     otherwise; (c) demand, compromise, collect, sue for and receive any
     money or property at any time due, payable or receivable on account of
     any or all accounts, promissory notes or other instruments,
     guaranties, chattel paper, security agreements, contract rights, tax
     refunds or other Receivables or General Intangibles of any or all of
     Debtors, or on account of any or all other debts, liabilities or
     obligations payable to any or all of Debtors; (d) institute any
     proceeding or proceedings to enforce any security interests, liens or
     other rights or interests of Secured Party hereunder; (e) sign the
     name of any or all of Debtors on any invoices to, drafts against and
     other notices and documents to account debtors or other obligors of
     any or all of Debtors and requests for verification of accounts and
     other amounts which may be due to any or all of Debtors; (f) execute
     proofs of claim and loss on behalf of any or all of Debtors;
     (g) subject to applicable law and agreements, apply all Collateral and
     proceeds of Collateral delivered to Secured Party or coming into
     Secured Party's possession or control from time to time to such of the
     Secured Obligations, whether matured or unmatured, as Secured Party
     may determine in its discretion, or hold the same as security for any
     contingent or future Secured Obligations; (h) at Debtors' expense,
     continue or complete, or


















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     cause to be continued or completed, performance of obligations of any
     or all of Debtors under any contracts of any or all of Debtors, and
     collect all income and revenues therefrom; and/or (i) use, operate,
     manage, control and exercise all rights of any or all of Debtors
     relating to, the Collateral and any other assets of any or all of
     Debtors, and collect all income and revenues therefrom.

               3.2 Collateral Dispositions.  Each of Debtors agrees that
                   -----------------------
     commercial reasonableness and good faith require Secured Party to give
     Debtors no more than ten (10) days prior written notice of the time
     and place of any public disposition of Collateral or of the time after
     which any private disposition or any other intended disposition is to
     be made.  All sales or other dispositions of Collateral may be made
     for cash, upon credit or for future delivery.  In no event shall any
     of Debtors be credited with any part of the proceeds of liquidation,
     sale or other disposition of any Collateral until final payment
     thereon has been received by Secured Party in immediately available
     funds, and Secured Party shall have no obligation to delay any
     liquidation, sale or other disposition because the same may result in
     the imposition of any forfeiture, premium or penalty.

               3.3 Expenses.  Each of Debtors jointly and severally agrees
                   --------
     to pay to Secured Party, each Lender, each Noteholder and Issuing Bank
     upon its demand from time to time, the amount of all expenses,
     including reasonable attorneys' fees and expenses, paid or incurred by
     it (a) in exercising or enforcing or consulting with counsel
     concerning, any of its rights hereunder or under law, or (b) in
     defending any and all non-meritorious or previously waived demands,
     claims, counterclaims, cross-claims, causes of action, litigation and
     proceedings of every kind and nature asserted, commenced or instituted
     against it or any of its officers, directors, employees or agents, by
     any one or more of Debtors, any Subsidiary of any one or more of
     Debtors or any Other Obligor on account of, as a result of or relating
     to, any action taken or not taken by Secured Party, any Lender, any
     Noteholder or Issuing Bank in connection with the Collateral or
     enforcement or exercise by it of any of its rights or remedies under
     this Agreement or under law.  Each of Debtors also jointly and
     severally agrees to pay to Secured Party, each Lender, each Noteholder
     and Issuing Bank upon its demand from time to time, interest on the
     outstanding amount of such expenses, from the date of demand for
     payment of such expenses until the same are paid in full, at the rate
     from time to time applicable to Base Rate Loans.
























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                        SECTION 4.  ADDITIONAL PROVISIONS


     4.1Further Assurances, Power of Attorney.  Each of Debtors agrees
        -------------------------------------
     promptly to do, make, execute and deliver all such additional and
     further acts, things, deeds, assurances, instruments and documents as
     Secured Party may request in good faith to vest in and assure to
     Secured Party its rights hereunder or in any of the Collateral.  Each
     of Debtors hereby appoints Secured Party and its designees as
     attorney-in-fact of such Debtor, irrevocably and with power of
     substitution, with authority to execute and deliver from time to time,
     in the name and stead of such Debtor, all documents which such Debtor
     is required to, but has failed or refused to, execute and deliver to
     Secured Party pursuant to this Agreement, and with authority to take
     all of the actions from time to time on behalf of such Debtor, and in
     the name and stead of such Debtor, which Secured Party is authorized
     to take under this Agreement or which Secured Party in its discretion
     exercised in good faith deems necessary or advisable in order to cause
     such Debtor to be in compliance with any of the terms of this
     Agreement or in order to carry out and enforce this Agreement.  Said
     attorney or designee shall not be liable for any acts of commission or
     omission nor for any error of judgment or mistake of fact or law which
     does not arise from its gross negligence or willful misconduct.  This
     power of attorney is coupled with an interest and is irrevocable so
     long as any of the Secured Obligations remain unpaid or unperformed or
     there exists any commitment by Lenders or Noteholders which could give
     rise to any Secured Obligations.

               4.2 Waiver of Trial by Jury.  Each of Debtors and Secured
                   -----------------------
     Party agrees that any action, suit or proceeding involving any claim,
     counterclaim or cross-claim arising out of or in any way relating,
     directly or indirectly, to this Agreement, or any liabilities, rights
     or interests of any of Debtors, Secured Party or any other person
     arising out of or in any way relating, directly or indirectly, to this
     Agreement, shall be tried by a court and not by a jury.  Each of
     Debtors and Secured Party hereby waives any right to trial by jury in
     any such action, suit or proceeding, with the understanding and
     agreement that this waiver constitutes a waiver of trial by jury of
     all claims, counterclaims and cross-claims against all parties to such
     actions, suits or proceedings, including claims, counterclaims and
     cross-claims against parties who are not parties to this Agreement. 
     This waiver is knowingly, willingly and voluntarily made by each of
     Debtors and Secured Party, and each of Debtors and Secured Party
     acknowledges and agrees that this waiver of trial by jury is a
     material aspect of the agreements between such Debtors and Secured
     Party and that no representations of fact or opinion have been made by
     any person to induce this waiver of trial by jury or to modify, limit
     or nullify its effect.


















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               4.3  Additional Waivers.  Except in the case of any notices
                    ------------------
     specifically required to be given to Debtors by Secured Party, any
     Lender, Issuing Bank or any Noteholder pursuant to this Agreement, any
     of the Lender Documents or any of the Noteholder Documents, each of
     Debtors hereby waives notice of each and every one of the following
     acts, events and/or conditions and agrees that, without necessity for
     any express reservation of rights against such Debtors, neither the
     occurrence or existence of any such act, event or condition, nor
     Secured Party's, any Lender's, Issuing Bank's or any Noteholder's
     commission of or omission to do any such act, event or condition, in
     any number of instances, shall in any way release, discharge, impair
     or diminish any of the Secured Obligations, except as otherwise
     specifically agreed by Secured Party in writing:  (a) the amendment,
     modification, renewal, extension or refinancing of, or the granting by
     Secured Party, any Lender, Issuing Bank or any Noteholder of any
     indulgence of any nature with respect to, or the invalidity,
     voidability, unenforceability, compromise, settlement, release,
     waiver, discharge or impairment, in whole or in part, of, any of the
     Secured Obligations or any obligation of any Other Obligor with
     respect to any of the Secured Obligations; (b) any defense of Borrower
     or any Other Obligor to payment of any of the Secured Obligations;
     (c) the addition of any maker, guarantor, surety, endorser, indemnitor
     or other person primarily or secondarily liable for or obligated upon
     any of the Secured Obligations; (d) assumption of any of the Secured
     Obligations by any other person, whether by assignment, sale, merger,
     consolidation, sublease, conveyance or otherwise; (e) delivery to
     Secured Party, any Lender, Issuing Bank or any Noteholder or
     acceptance by Secured Party, any Lender, Issuing Bank or any
     Noteholder of any promissory note or other instrument or writing
     evidencing or otherwise relating to any of the Secured Obligations;
     (f) the institution of any suit, the obtaining of any judgment or the
     exercise of any other right or remedy against any of Debtors,
     Borrower, UIC or any Other Obligor; (g) the sale, exchange, pledge,
     release, disposition, surrender, loss, destruction, damage to or
     impairment of, any Collateral; (h) the creation, perfection,
     continuation, amendment, modification, invalidity, voidability,
     unenforceability, compromise, settlement, subordination, release,
     waiver, discharge, impairment or loss of priority, in whole or in
     part, of, any security interest, lien other encumbrance directly or
     indirectly securing any of the Obligations; or (i) any other event,
     circumstance or condition which might otherwise constitute a legal or
     equitable discharge of a surety or a guarantor.  Each of Debtors also
     hereby waives, to the extent the same may be waived under applicable
     law:  (a) notice of acceptance by Secured Party of this Agreement;
     (b) all claims, causes of action and rights of each of Debtors against
     Secured Party on account of actions taken or not taken by Secured
     Party in the exercise of Secured Party's rights or remedies under this
     Agreement or under law, provided that the



















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     same did not arise from Secured Party's negligence or willful
     misconduct; (c) all claims and causes of action of each of Debtors
     against Secured Party for punitive, exemplary, indirect, special,
     consequential or other non-compensatory damages; (d) all rights of
     redemption of each of Debtors with respect to any of the Collateral;
     (e) in the event Secured Party seeks to repossess any or all of the
     Collateral by judicial proceedings, any bonds or demands for
     possession which otherwise may be required; (f) all rights of each of
     Debtors to have marshalled the Collateral or any other security for
     any of the Secured Obligations; (g) diligence in the enforcement or
     collection of all of the Obligations; (h) presentment, protest, notice
     of protest and notice of non-payment with respect to all of the
     Secured Obligations; and (i) any duty or obligation of Secured Party
     to disclose to any of Debtors any information concerning any other
     customer or client, or prospective customer or client, of Secured
     Party.  Each of Debtors agrees that Secured Party may exercise any or
     all of its rights and/or remedies without resorting to, without regard
     to, and regardless of the adequacy of, any security or other sources
     of liability with respect to any of the Secured Obligations.  Neither
     any failure nor any delay on the part of Secured Party in exercising
     any right, power or remedy shall operate as a waiver thereof, nor
     shall a single or partial exercise thereof preclude any other or
     further exercise thereof or the exercise of any other right, power or
     remedy.

               4.4 Modifications, Notices.  No modification or waiver of
                   ----------------------
     any provision of this Agreement, and no consent by Secured Party to
     any failure of any of Debtors to comply with any provision of this
     Agreement, shall in any event be effective unless the same shall be in
     writing and signed by the person against whom enforcement thereof is
     sought, and then such waiver or consent shall be effective only in the
     specific instance and for the purpose for which given.  No notice to
     or demand upon any of Debtors in any circumstance shall entitle any of
     Debtors to any other or further notice or demand in the same, similar
     or other circumstances.  All notices, requests and demands to or upon
     the respective parties hereto to be effective shall be in writing and
     shall be deemed to have been duly given or made when delivered by
     hand, or, if earlier, three (3) days after being deposited in the
     mail, postage prepaid, or when transmitted by telecopy transmission,
     provided that any such notice or communication to any of Debtors shall
     be hand-delivered or transmitted to such Debtor or Debtors at the
     Debtor Notice Address (or at such other address as such Debtor or
     Debtors may specify to Secured Party in writing from time to time),
     and any such notice or communication to Secured Party shall be hand-
     delivered or transmitted to Secured Party at the Secured Party Notice
     Address (or at such other address as Secured Party may specify to
     Debtors in writing from time to time).




















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               4.5 Survival, Merger and Counterparts.  All representations,
                   ---------------------------------
     warranties, covenants, conditions and agreements contained herein
     shall survive the execution and delivery hereof.  Each of Debtors
     shall continue to observe, comply with and perform all warranties,
     covenants, conditions and agreements to be observed, complied with or
     performed by such Debtor under this Agreement until all of the Lender
     Obligations and all of the Debtor Obligations to each Lender and
     Issuing Bank have been paid in full and there exists no commitment by
     any of Lenders or Issuing Bank which could give rise to any Lender
     Obligations.  This Agreement contains the entire agreement of the
     parties with respect to the matters covered and the transactions
     contemplated hereby and thereby, and no agreement, statement or
     promise made by any party hereto, or by any employee, officer, agent
     or attorney of any party hereto, which is not contained herein or
     therein, shall be valid or binding.  This Agreement may be executed in
     any number of counterparts and by different parties on separate
     counterparts, each of which, when so executed and delivered, shall be
     an original, but all such counterparts shall together constitute one
     and the same agreement.

               4.6 Law, Jurisdiction, Process, Transfers and
                   -----------------------------------------
     Unenforceability.  The performance and construction of this Agreement
     ----------------
     shall be governed by the internal laws of the State of Maryland
     (exclusive of principles of conflicts of laws).  Each of Debtors
     agrees that any suit, action or proceeding with respect to the
     Collateral or this Agreement may be brought in any state or federal
     court located in the State of Maryland.  Each of Debtors consents to
     the in personam jurisdiction of such courts and each of Debtors
         -- --------
     irrevocably waives any objection to, and any right of immunity from,
     the jurisdiction of such courts or the execution of judgments
     resulting therefrom, on the grounds of venue or the convenience of the
     forum.  In addition, any such suit, action or proceeding instituted by
     Secured Party may be brought in such other courts in which
     jurisdiction and venue may be appropriate.  Each of Debtors agrees
     that service of process in any such suit, action or proceeding may be
     effected by mailing a copy thereof by registered or certified mail (or
     any substantially similar form of mail), postage prepaid, to such
     Debtor at the Debtor Notice Address (or at such other address as such
     Debtor may specify to Secured Party in writing from time to time). 
     This Agreement shall be binding upon and inure to the benefit of the
     parties hereto and their respective successors and assigns, and each
     reference in this Agreement to any of the parties hereto shall be
     deemed to include the successors and assigns of such party, including,
     in the case of each of Debtors, the debtor, the debtor in possession
     and trustee in any case under any chapter of the United States
     Bankruptcy Code in which such Debtor is debtor.  None of Debtors may
     assign this Agreement or any of its rights hereunder without Secured
     Party's prior written consent.  Subject to applicable law and
     agreements, any of Lenders, Issuing Bank or Noteholders may at any
     time, in its














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     discretion, assign, transfer or pledge to any person, or grant to any
     person a security interest in, this Agreement or any of its rights
     hereunder.  Subject to applicable law and agreements, any of Lenders,
     Issuing Bank or Noteholders may sell, in such amounts, upon such terms
     and to such persons as it may determine, participations in its
     beneficial interests under this Agreement.  If any term, provision or
     condition, or any part thereof, of this Agreement shall for any reason
     be found or held invalid or unenforceable by any court or governmental
     agency, such inalidity or unenforceability shall not affect the
     remainder of such term, provision or condition, nor any other term,
     provision or condition, and this Agreement shall survive and be
     construed as if such invalid or unenforceable term, provision or
     condition had not been contained herein or therein; provided, however,
     that if any rate of interest provided under this Agreement does or
     shall exceed the maximum interest rate which any of Debtors is
     permitted by law to contract or agree to pay, then such rate of
     interest shall immediately be deemed to be reduced to such maximum
     rate and all previous payments of interest in excess of the maximum
     rate shall be deemed to have been payments in reduction of principal
     and not of interest.

               IN WITNESS WHEREOF, Debtors and Secured Party have duly
     executed this Agreement under seal as of the day and year first
     written above.

     ATTEST/WITNESS:                    FIRST FIDELITY BANK, NATIONAL
                                           ASSOCIATION



     _________________________
     By:__________________________(SEAL)
                                           Michael W. Coiley
                                           Vice President


     [SIGNATURES CONTINUED]
     [SIGNATURES CONTINUED]


                                        AAI SYSTEMS MANAGEMENT, INC.
                                        AAI/ACL TECHNOLOGIES, INC.
                                        AAI ENGINEERING SUPPORT INC.
                                        AAI CALIFORNIA CARSHELL, INC.
                                        AAI MEDICAL CORPORATION





                                        By:__________________________(SEAL)
     -------------------------

                                           Paul J. Michaud














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                                           Vice President of each of the
                                           foregoing Debtors

                                             UIC - DEL. CORPORATION
                                             AAI INTERNATIONAL, INC.
                                             AAI MICROFLITE SIMULATION
                                                INTERNATIONAL CORPORATION
                                             SETI, INC.






     ------------------------------
     By:__________________________(SEAL)
                                           Paul J. Michaud
                                           President of each of the
                                           foregoing Debtors


                                        SYMTRON SYSTEMS, INC.





                                        By:__________________________(SEAL)
     -------------------------
                                           Bernard Fein
                                           Chief Executive Officer



































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