Document:

SECOND AMENDMENT TO LETTER OF CREDIT,
                           LOAN AND SECURITY AGREEMENT

            THIS SECOND AMENDMENT TO LETTER OF CREDIT, LOAN AND SECURITY
AGREEMENT ("Second Amendment") is made effective as of December _____, 2000, by
and among Elecsys Corporation, f/k/a Airport Systems International, Inc.
("Elecsys"); Airport Systems International, Inc. ("New ASI") and DCI, Inc.
("DCI") (Elecsys, ASI and DCI collectively, jointly and severally, the
"Borrower"), and Bank of America, N.A. ("Lender").

                             PRELIMINARY STATEMENTS

            (A) Effective February 7, 2000, Elecsys, (then known as Airport
Systems International, Inc.), DCI and Lender entered into a Letter of Credit,
Loan and Security Agreement and other Financing Documents (as therein defined)
(collectively as amended, the "Loan Agreement");

            (B) The Loan Agreement provided, among other things, that Lender
would lend Elecsys and DCI $8,000,000 on a revolving basis, $1,178,000 on a term
loan basis, and $2,599,572.60 on direct pay letter of credit facility;

            (C) Effective November 1, 2000, Elecsys, then known as Airport
Systems International, Inc., did the following (the "Restructuring"): (1)
changed its name to "Elecsys Corporation" (2) formed a new company called
Airport Systems International, Inc. as a wholly owned subsidiary of Elecsys (New
ASI) and (3) transferred all of Elecsys' assets and liabilities to Airport
Systems International, Inc.(except for the stock of DCI and the assets and
liabilities related to the ownership of the DCI stock);

            (D) The Restructuring occurred without compliance with Sections 10.3
and 10.4 of the Loan Agreement. In addition, Elecsys is not in compliance with
certain financial covenants set forth in the Loan Agreement. Therefore Borrower
has requested that Lender modify the terms and conditions of the Loan Agreement
as provided herein.

            (E) The Export-Import Bank of the United States ("EXIMBANK")
guaranteed a portion of the Borrowers Obligations under the Financing Documents.

            NOW, THEREFORE, in consideration of the premises and upon
application of Borrower, it is agreed by and among Lender and Borrower as
follows:

                                    AGREEMENT

            1. Acknowledgment of Preliminary Statements. The preliminary
statements set forth above are accurate, represent the intent of the parties
hereto and are incorporated herein
<PAGE>

by reference. Unless otherwise defined in this Second Amendment, capitalized
terms used herein will have the same meaning in this Second Amendment as set
forth in the Loan Agreement.

            2. General Non-Waiver. Except as expressly provided herein, nothing
in this Second Amendment shall be construed as a waiver on the part of Lender as
to any rights, remedy or remedies it may enjoy under the Loan Agreement with
respect to any existing circumstances, facts or events constituting an Event of
Default under the Loan Agreement.

            3. Acknowledgment of Existing Defaults. Borrower hereby acknowledges
that the Restructuring occurred without compliance with Sections 10.3 and 10.4
of the Loan Agreement, and therefore constitutes Events of Default under Section
11.1(c) of the Loan Agreement. Borrower further acknowledges that for the period
from October 31, 2000 through the effective date of this Second Amendment, it is
not in compliance with the Minimum Tangible Net Worth, Maximum Liabilities Ratio
and Minimum Debt Service Coverage Ratio called for under the Loan Agreement and
that each such instance of non-compliance constitutes an Event of Default under
the Loan Agreement. All Events of Default described in this paragraph shall be
hereinafter referred to as the "Existing Defaults."

            4. Limited Waiver of Defaults. Upon Lender's execution of this
Second Amendment, Borrower's payment in full of all fees, costs and expenses
hereunder required to be paid by Borrower including without limitation the
Forbearance and Waiver Fee, and Borrower's satisfaction of all conditions
precedent described in section 9 of this Second Amendment to the satisfaction of
Lender in its sole discretion, Lender hereby waives the Existing Defaults and
its right to collect interest at the Default Rate, provided Borrower remains in
compliance with the terms of the Loan Agreement as modified by this Second
Amendment. Nothing contained in this Second Amendment shall constitute or be
construed as a waiver of any other Default or Event of Default except as
expressly provided in this Paragraph 4.

            5.    [Intentionally omitted.]

            6.    Modifications   to  Loan  Agreement.   Lender  and  Borrower
hereby agree that the Loan Agreement is amended and modified as follows:

                  6.1 Section 1.1 is hereby amended by deleting the figure
            "$8,000,000.00" following "(ii)" in the paragraph on page 3 which
            begins with "Available Commitment" and substituting the figure
            "$9,000,000.00."

                  6.2 Section 1.1 is hereby amended by deleting the phrase
            "United States Six Million Dollars (U.S. $6,000,000)" in the
            paragraph on page 5 which begins with "Commitment" and substituting
            the phrase "United States Seven Million Dollars (U.S.$7,000,000)."

<PAGE>

                  6.3 Section 3.5 is hereby amended by deleting the phrase "one
            and one-quarter of one percent per annum (1.25%)" and substituting
            the phrase "one and three-quarters of one percent per annum
            (1.75%)."

                  6.4 The Promissory Note is hereby amended by deleting the
            phrase "plus one-half of one percent per annum (0.5%)" appearing in
            subparagraph (a) to the first full paragraph on the first page of
            the Promissory Note and substituting the phrase "plus two percent
            per annum (2%)."

                  6.5   Section  12.3(b) is deleted  in its  entirety  and the
            following is substituted therefor:

                  (b) EXIMBANK Facility Fee. The Borrower shall be obligated to
                  pay directly to the Bank the EXIMBANK Facility Fee in the
                  amount of U.S. $105,000.00 per annum, to be prorated for any
                  portion of a 12-month period during which the Commitment will
                  be outstanding, which is due and payable on the date of this
                  Agreement and on each anniversary of the date of this
                  Agreement.

                  6.6   Section  12.3(c) is deleted  in its  entirety  and the
            following is substituted therefor:

                  (c) Unused Line Fee. In connection with and as a consideration
                  for the Bank's Commitment, the Borrowers shall pay a fee to
                  the Bank in an amount equal to one-half of one percent (.5%)
                  per annum of the average daily unused portion of the
                  Commitment payable quarterly in arrears on the first day of
                  each quarter and on the date of any permanent reduction in the
                  Commitment.

                  6.7   Section  9.1  is  deleted  in  its  entirety  and  the
            following is substituted therefor:

                         "Section 9.1 Financial Ratios.

                        (a)   Minimum   Tangible   Net   Worth.   Permit   the
                              Tangible  Net Worth of the  Borrower  to be less
                              than:

                              (1)  $5,600,000 at the end of the fiscal quarter
                                 ending January 31, 2001,
                              (2)  $6,100,000   at  the  end  of  each  fiscal
                                 quarter thereafter.
<PAGE>

                        (b)   Minimum  Current  Ratio.  Permit  the  Current
                              Ratio at any time to be less  than  1.45 to 1.0,
                              measured on a quarterly basis beginning  January
                              31, 2001.

                        (c)     [Intentionally omitted].

                        (d)   Maximum    Liabilities   Ratio.   Permit   the
                              Liabilities Ratio of the Borrower to exceed:

                              (1)  2.75  to  1  at  the  end  of  the   fiscal
                                 quarters  ending  January  31, 2001 and April
                                 30, 2001,

                              (5)  2.50  to  1  at  the  end  of  each  fiscal
                                 quarter thereafter.

                        (e)   Minimum Debt Service  Coverage  Ratio.  Permit
                              the Debt Service  Coverage Ratio of the Borrower
                              to be less than:

                              (1)   .75  to 1  at  the  end  of  the  fiscal
                                    quarter ending January 31, 2001
                              (2)   1.00  to 1 at  the  end  of  the  fiscal
                                    quarter ending April 30, 2001
                              (3)   1.20  to 1 at  the  end of  each  fiscal
                                    quarter thereafter.

            7. Further Security Documents. As a material part of the
consideration for Lender entering into this Second Amendment and in order to
induce Lender to modify the Loan Agreement and to extend credit to Borrower,
Elecsys and New ASI agree as follows:

            7.1 New ASI hereby acknowledges, assumes and agrees to be bound by
      all of the terms and conditions of the Loan Agreement as if an original
      borrower thereunder, including without limitation, acknowledging Lender's
      security interests in and to all of Elecsys' assets, which security
      interests continue to be attached and perfected notwithstanding the
      transfer of such assets to New ASI.

            7.2 To the extent not already granted, New ASI does hereby grant
      Lender a security interest in and to all of its assets, including, without
      limitation, all Receivables, Inventory, Equipment, Contract Rights,
      General Intangibles, Deposit Accounts, Real Estate and other Collateral as
      those terms are defined in the Loan Agreement to secure the payment and
      performance of all of Borrower's Obligations under the Loan Agreement. New
      ASI additionally agrees to execute a security agreement in such form as is
      reasonably acceptable to Lender.

            7.3 Elecsys shall and does hereby pledge as security for any or all
      of Borrower's Obligations to Lender under the Loan Agreement all its right
      title and interest in and to any and all shares of stock in New ASI.
      Elecsys shall execute a
<PAGE>

     Stock Pledge Agreement further evidencing such pledge in such form as is
     reasonably acceptable to Lender.

            8. Modification Expenses. Borrower will pay to Lender promptly as
they come due, any and all costs and expenses incurred by Lender in connection
with the negotiation, preparation and documentation of this Second Amendment,
including without limitation, all recording fees, mortgage registration tax and
all reasonable attorneys' fees and costs.

            9.    Conditions  Precedent.  Lender shall be under no  obligation
of any kind under  this  Second  Amendment  unless  the  following  conditions
precedent have been satisfied as determined in the sole discretion of Lender:

            9.1 Completion of a U.C.C. search at the expense of Borrower
      demonstrating no intervening liens, claims or encumbrances that would
      adversely impact upon Lender's security interests as set forth in this
      Second Amendment and the Loan Agreement.

            9.2 Full disclosure of all information and documents relating to the
      name change, subsidiary formation and transfer set forth in the
      preliminary statements above that may be reasonably requested by Lender.

            9.3   Payment in full of the  Forbearance  and Waiver Fee in
      immediately available funds.

            9.4 Execution of a security agreement and stock pledge agreement
      required by Section 7 of this Second Amendment.

            9.5 Delivery of an reasoned opinion letter from Blackwell Sanders
      Peper Martin LLP to Lender in form and substance acceptable to Lender in
      its sole discretion opining that the Restructuring was duly authorized
      pursuant to the organizational documents of Elecsys and pursuant to Kansas
      and Federal law with full corporate authority.

            9.6 Delivery of an unqualified opinion letter from Blackwell Sanders
      Peper Martin LLP in form and substance acceptable to Lender in its sole
      discretion opining as to the creation and perfection of security interests
      in favor of Lender with respect to all assets of Borrower.

            9.7 Execution and Delivery of a new Promissory Note reflecting the
      change in the amount of Commitment set forth in paragraph 6.2 of this
      Second Amendment.

            9.8 Execution of any other documents, including financing
      statements, amendments to existing financing statements, or other
      documents reasonably requested by Lender in connection herewith.
<PAGE>

            10. Cross Default and Cross Collateralization. A default in the
payment or performance of Borrower's obligations under this Second Amendment
will constitute an Event of Default under the Loan Agreement and in such event
Lender will be entitled to exercise any and all remedies available thereunder.
Lender and Borrower further agree that the Security Documents securing the Loan
Agreement are hereby modified so that the Security Documents will continue to
secure the Loan Agreement as amended by this Second Amendment.

            11. Ratification. The parties hereto ratify and reaffirm that all
terms, conditions and provisions of the Loan Agreement remain in full force and
effect except to the extent expressly modified by the terms of this Second
Amendment and the terms and conditions of this Second Amendment are hereby
incorporated in, and will hereafter be deemed a part of, the Loan Documents for
all purposes.

            12. Releases. As a material part of the consideration for Lender
entering into this Second Amendment and in order to induce Lender to modify the
Loan Agreement and to extend credit to Borrower, Borrower hereby jointly and
severally releases and forever discharges Lender's directors, officers,
employees, agents, attorneys, affiliates, subsidiaries, successors and assigns
from any and all liabilities, obligations, actions, contracts, claims, causes of
action, damages, demands, costs and expenses whatsoever (collectively "Claims"),
of every kind and nature, however evidenced or created, whether known or
unknown, arising prior to or on the date of this Second Amendment including, but
not limited to, any Claims involving the extension of credit under or
administration of the Loan Agreement, the indebtedness incurred by the Borrower
or any other transactions evidenced by the Loan Agreement and/or this Second
Amendment.

            13. Renewal. To the extent that any payment or payments made to
Lender under this Second Amendment or the Loan Agreement are subsequently
invalidated, declared to be fraudulent or preferential, set aside and/or
required to be repaid to a trustee, to either Borrower, whether directly or
indirectly as a debtor-in-possession, or to a receiver or any other party under
any bankruptcy law, or other state or federal law, then the portion of the
indebtedness of the Borrower intended to have been satisfied by such payment or
payments will be revived and will continue in full force and effect as if such
payment or payments had never been received by Lender.

            14.   Representations  and  Warranties.   Elecsys,   ASI  and  DCI
                  --------------------------------
jointly and severally represent and warrant to Lender as follows:

                  (A) All of the representations and warranties of Borrower in
      the Loan Agreement are true and correct as of the date hereof, as modified
      by this Second Amendment.

                  (B) Except as expressly described herein, no Event of Default
      is in existence with respect to the Loan Agreement or Security Documents.
<PAGE>

                  (C) No Event of Default has occurred or will occur as a result
      of the execution, delivery, and performance of this Second Amendment.

                  (D) This Second Amendment has been duly authorized, executed
      and delivered and is a legally valid, binding, joint and several
      obligation of Elecsys, ASI and DCI and is enforceable against each of them
      in accordance with its terms.

                  (E) The transfer to New ASI by Elecsys of assets and related
      liabilities in the Restructuring did not create any tax liability to
      Elecsys or New ASI, and (ii) the conduct of the navigational aids business
      through New ASI will not have any material federal income tax consequences
      different than if such business had continued to be conducted through
      Elecsys.

            15.   Miscellaneous.

                  (A) Borrower hereby agrees and acknowledges that Lender may
      endorse and deposit any check or other instrument tendered in connection
      with a partial payment without thereby giving effect to or being bound by
      any language purporting to make acceptance of such instrument an accord
      and satisfaction of the Secured Obligations evidenced by this Second
      Amendment or the Loan Agreement.

                  (B) In the event of a conflict between or among the terms,
      covenants, conditions or provisions of this Second Amendment, Loan
      Agreement or any other Loan Documents, Lender may elect to enforce from
      time to time those provisions that would afford Lender the maximum
      financial benefits and security for the Secured Obligations and/or provide
      Lender the maximum assurance of payment of the Secured Obligations in
      full.

                  (C) No inference in favor of, or against, any party will be
      drawn from the fact that such party has drafted any portion of the Loan
      Agreement.

                  (D) This Second Amendment may be executed in any number of
      counterparts, each of which will be deemed to be an original but all of
      which taken together will constitute one and the same agreement.

                  (E) This Second Amendment will be governed by and construed
      under the laws of the State of Missouri.

                  (F) This Second Amendment will be binding upon and will inure
      to the benefit of the parties hereto and to their respective successors
      and assigns.

            16. WAIVER OF JURY TRIAL. LENDER AND BORROWER WAIVE THE RIGHT TO A
TRIAL BY JURY IN ANY ACTION OR PROCEEDING BASED UPON, OR RELATED TO, THE SUBJECT
MATTER OF THIS SECOND AMENDMENT. THIS WAIVER IS KNOWINGLY, INTENTIONALLY AND
VOLUNTARILY MADE BY
<PAGE>

BORROWER AND BORROWER ACKNOWLEDGES THAT NEITHER LENDER NOR ANY PERSON ACTING ON
BEHALF OF LENDER HAS MADE ANY REPRESENTATIONS OF FACT TO INDUCE THIS WAIVER OF
TRIAL BY JURY OR IN ANY WAY TO MODIFY OR NULLIFY ITS EFFECT. BORROWER FURTHER
ACKNOWLEDGES THAT IT HAS BEEN REPRESENTED (OR HAS HAD THE OPPORTUNITY TO BE
REPRESENTED) IN THE SIGNING OF THIS FIRST AMENDMENT AND IN THE MAKING OF THIS
WAIVER BY INDEPENDENT LEGAL COUNSEL, SELECTED OF ITS OWN FREE WILL, AND IT HAS
HAD THE OPPORTUNITY TO DISCUSS THIS WAIVER WITH COUNSEL. BORROWER FURTHER
ACKNOWLEDGES THAT IT HAS READ AND UNDERSTANDS THE MEANING AND RAMIFICATIONS OF
THIS WAIVER PROVISION.

            IN WITNESS WHEREOF, Borrower and Lender have caused this First
Amendment to be executed by an officer duly authorized to so execute and bind
Borrower and Lender, respectively, effective as of the day and year first
written above.

"BORROWER"

ELECSYS CORPORATION, a Kansas
corporation

By:
Printed Name:
Its:

DCI, INC., a Kansas corporation

By:
Printed Name:
Its:

AIRPORT SYSTEMS INTERNATIONAL, INC., a
Kansas corporation

By:
Printed Name:
Its:

<PAGE>

            ACCEPTED effective the _____ day of December, 2000, at Lender's
place of business in the City of Kansas City State of Missouri.

"LENDER"

BANK OF AMERICA, N.A.,
a national banking association

By:
Printed Name:
Title:REVOLVING CREDIT NOTE B

$2,000,000                                       Date:  February __, 2000

     FOR VALUE RECEIVED, on February __, 2000 the undersigned promises to pay to
the order of Bank of America, N.A., (hereinafter, together with any holder
hereof, called "Holder") at Kansas City, Missouri (or at such other place as the
Holder may designate in writing to the undersigned) the principal amount of Two
Million and and No/100 Dollars ($2,000,000.00) or so much thereof as has been
advanced hereunder.

     The undersigned shall pay interest as provided in that certain Loan and
Security Agreement between the undersigned and Holder dated February 7, 2000
(the "Loan Agreement"). Unless otherwise defined herein, defined terms shall
have the same meaning as in the Loan Agreement.

     It is contemplated that the principal sum evidenced by this Note may be
reduced from time to time and that additional advances may be made from time to
time, as provided in the Loan Agreement; provided, however, that the outstanding
principal amount evidenced by this Note shall not exceed the maximum amount
provided in the Loan Agreement.

     This Note is subject to the terms and conditions of, and entitled to
the benefit of the Collateral described in, the Loan Agreement. Capitalized
terms not defined herein shall have the meanings given in the Loan Agreement.

     No delay or failure on the part of the Holder in the exercise of any right
or remedy hereunder, under the Loan Agreement, the Security Documents or at law
or in equity, shall operate as a waiver thereof, and no single or partial
exercise by the Holder of any right or remedy hereunder, under the Loan
Agreement, the Security Documents, or at law or in equity shall preclude or
estop another or further exercise thereof or the exercise of any other right or
remedy.

     Principal and interest on this Note shall be payable and paid in lawful
money of the United States of America.

     The undersigned and all endorsers waive presentment, notice of dishonor and
protest.

     Time is of the essence of this Note and, in case this Note is collected by
law or through an attorney at law, or under advice therefrom, the undersigned
agrees to pay all costs of collection, including reasonable attorneys' fees if
collected by or through an attorney.

     The provisions of this Note shall be construed and interpreted and all
rights and obligations of the parties hereunder determined in accordance with
the laws of the State of Missouri.
<PAGE>

     THIS REVOLVING CREDIT NOTE "B" EVIDENCES, IN PART, THE SAME INDEBTEDNESS AS
EVIDENCED BY DOCUMENTATION RELATING TO THE "EXISTING LOANS" (AS SUCH TERM IS
DEFINED IN THE LOAN AGREEMENT). THIS REVOVING CREDIT NOTE "B" IS SECURED BY ALL
OF THE SAME COLLATERAL AS THE EXISTING LOANS PURSUANT TO THE TERMS OF THE LOAN
AGREEMENT AND RELATED LOAN DOCUMENTS. ALL FUTURE ADVANCES MADE TO THE MAKER WILL
ALSO BE SECURED BY THE LOAN DOCUMENTS. THIS REVOLVING NOTE "B" IS, IN PART, A
RESTATEMENT OF THE EXISTING LOANS AND THE DOCUMENTS RELATING THERETO, AND ITS
EXECUTION AND DELIVERY DOES NOT EVIDENCE A CANCELLATION OF THE INDEBTEDNESS
EVIDENCED BY THE PRIOR DOCUMENTS.

     IN WITNESS WHEREOF, the undersigned has caused this Note to be executed,
sealed and delivered in Kansas City, Missouri, in its corporate name, by and
through its respective duly authorized officers, as of the day and year first
above written.

                                          BORROWER:

                                          ELECSYS CORPORATION, a Kansas
                                          corporation

Attest:                                   By:
                                             ---------------------------------
                                             Name:
                                                  ----------------------------
By:                                          Title:
    --------------------------                     ---------------------------
    Name:
         ---------------------
    Title:
          --------------------

                                          AIRPORT SYSTEMS INTERNATIONAL,
                                          INC., a Kansas corporation

Attest:                                   By:
                                             ---------------------------------
                                             Name:
                                                  ----------------------------
By:                                          Title:
    --------------------------                     ---------------------------
    Name:
          --------------------
    Title:
           -------------------

                                          DCI, INC., a Kansas corporation

Attest:                                   By:
                                             ----------------------------------
                                             Name:
                                                   ----------------------------
By:                                          Title:
    --------------------------                     ----------------------------
    Name:
          --------------------

<PAGE>

    Title:
           -------------------

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