<PAGE>

EXHIBIT 10.7

                   AMENDED AND RESTATED REVOLVING CREDIT NOTE

$14,800,000                                                       April 30, 2003
                                                                Philadelphia, PA


         FOR VALUE RECEIVED, ENVIRONMENTAL TECTONICS CORPORATION (the
"Borrower"), hereby unconditionally promises to pay to the order of PNC BANK,
NATIONAL ASSOCIATION (the "Bank"), at the office of the Bank located at 1600
Market Street, Philadelphia, Pennsylvania, 19103, on the Revolving Credit
Termination Date (as such term is defined in the Credit Agreement hereinafter
referred to) in lawful money of the United States of America and in immediately
available funds, the principal sum of (a) FOURTEEN MILLION EIGHT HUNDRED
THOUSAND DOLLARS ($14,800,000), or, if less, (b) the aggregate unpaid principal
amount of all Revolving Credit Loans made by the Bank to the Borrower pursuant
to the Credit Agreement. The Borrower further unconditionally agrees to pay
interest accrued on the unpaid principal amount outstanding hereunder from time
to time from the date hereof in like money at such office at the rates and on
the dates specified in the Credit Agreement together with all other costs, fees
and expenses as provided in the Credit Agreement.

         The holder of this Note is authorized to endorse on Schedule 1 annexed
hereto and made a part hereof or on a continuation thereof which shall be
attached hereto and made a part hereof the respective date, Type, and amount of
each Revolving Credit Loan made by the Bank to the Borrower, each continuation
thereof, each conversion of all or a portion thereof to another Type, the date
and amount of each payment or prepayment of principal thereof and, in the case
of Eurodollar Loans, the length of each Interest Period with respect thereto,
which endorsement shall constitute prima facie evidence of the accuracy of the
information endorsed absent manifest error; provided, however, that the failure
to make any such endorsement (or any error in such recordation) shall not affect
the obligations of the Borrower to make payments of principal, interest and
other amounts outstanding in accordance with the terms of this Note and the
Credit Agreement.

         This Note amends and completely restates and evidences the indebtedness
outstanding under and is substituted for, but not in payment, satisfaction,
cancellation or novation of, the Revolving Credit Note dated February 18, 2003
issued by the Borrower to the Bank and, as of the date hereof, shall be deemed
to be the Revolving Credit Note referred to in, evidences indebtedness incurred
under, and is entitled to the benefits of, the Credit Agreement, dated as of the
date hereof (as it may be amended, supplemented or otherwise modified from time
to time, the "Credit Agreement"), between the Borrower and the Bank. The Credit
Agreement, among other things, contains provisions for the acceleration of the
maturity hereof upon the happening of certain events, for optional or mandatory
prepayments of the principal hereof prior to the maturity thereof, for a higher
rate of interest upon the occurrence of an Event of Default and for certain
security interests granted by the Borrower and certain related entities.
Reference is made to the Credit Agreement and the other Loan Documents for a
statement of the terms and conditions under which the Revolving Credit Loans
evidenced hereby have been secured.

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         Upon the occurrence of any one or more of the Events of Default
specified in the Credit Agreement, all amounts then remaining unpaid on this
Note shall become, or may be declared to be, immediately due and payable, all as
provided therein.

         All parties now and hereafter liable with respect to this Note, whether
maker, principal, surety, guarantor, endorser or otherwise, hereby waive
presentment, demand, protest and notice (except as required under the Credit
Agreement) of any kind. No failure to exercise, and no delay in exercising, any
rights hereunder on the part of the holder hereof shall operate as a waiver of
such rights.

         Capitalized terms not otherwise defined herein shall have the meanings
set forth in the Credit Agreement. This Note shall be governed by, and construed
in accordance with, the laws of the Commonwealth of Pennsylvania.


                                        ENVIRONMENTAL TECTONICS CORPORATION


                                        By:  Duane D. Deaner
                                             --------------------------------
                                             Name:  Duane D. Deaner
                                             Title: Chief Financial Officer



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<TABLE>
<CAPTION>

                                                           Schedule 1

                                                 Loans, Conversions and Payments

====================================================================================================================================
                                                                      Amount of       Amount of
                                                                      Base Rate      Eurodollar
                                                                        Loans           Loans         Unpaid
                 Type of Loan                          Amount of      Converted     Converted To     Principal
                (Eurodollar or          Amount of      Principal    to Eurodollar     Base Rate     Balance of       Notation
  Date            Base Rate)              Loan          Repaid          Loans           Loans          Loans         Made By
====================================================================================================================================
<S>                <C>                    <C>            <C>            <C>             <C>             <C>             <C>

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</TABLE>