PATRICK AIRCRAFT TANK SYSTEMS, INC.

                                   BY-LAWS


                                  ARTICLE I.

                                 STOCKHOLDERS

     SECTION 1.01.  ANNUAL MEETINGS.  The Corporation shall hold each year, 
commencing with the year 1980, an annual meeting of the stockholders for the 
election of directors and the transaction of any business within the powers 
of the Corporation, on the second Friday of September in each year if not a 
legal holiday, and if a legal holiday, then on the first day following which 
is not a Sunday or a legal holiday. Any business of the Corporation may be 
transacted at an annual meeting without being specifically required by 
statute or by the charter to be stated in the notice. Failure to hold an 
annual meeting at the designated time shall not, however, invalidate the 
corporation existence or affect otherwise valid corporate acts.

     SECTION 1.02.  SPECIAL MEETINGS.  At any time in the interval between 
annual meetings, special meetings of the stockholders may be called by the 
President or by a majority of the Board of Directors by vote at a meeting or 
in writing with or without a meeting.

     SECTION 1.03.  PLACE OF MEETINGS.  All meetings of stockholders shall be 
held at the principal office of the Corporation in Howard County, Maryland, 
except in cases in which the notice thereof designates some other place; but 
all such meetings shall be held within the State of Maryland.

     SECTION 1.04.  NOTICE OF MEETINGS.  Not less than ten days nor more than 
ninety days before the date of every stockholders' meetings, the Secretary 
shall give to each stockholder entitled to vote at such meeting, written or 
oral notice stating the time and place of the meeting, and in the case of a 
special meeting, the purpose or purposes for which the meeting is called, 
either by mail or by presenting it to him personally or by leaving it at his 
residence or usual place of business. If mailed, such notice shall be deemed 
to be given when deposited in the United States Mail addressed to the 
stockholder at his post office address as it appears on the records of the 
Corporation, with postage thereon prepaid. Notwithstanding the foregoing 
provision, a waiver of notice in writing, signed by the person or persons 
entitled to such notice and filed with the records of the meeting, whether 
before or after the holding thereof, or actual attendance at the meeting in 
person or by proxy, shall be deemed equivalent to the giving of such notice 
to such persons. Any meeting of stockholders, annual or special, may adjourn 
from time to time to reconvene at the same or some other place, and no notice 
need be given of any such adjourned meeting other than by announcement.


                                      2.

     SECTION 1.05.  VOTES REQUIRED.  Actions required to be voted on by the 
stockholders in accordance with the "Corporation and Association" Article 
of the Maryland Annotated Code, shall be passed by the majority vote of 
stockholders entitled to vote.

     SECTION 1.06.  LIST OF STOCKHOLDERS.  At each meeting of stockholders a 
full, true and complete list in alphabetical order, or in alphabetical order 
by classes of stock, or all stockholders entitled to vote at such meeting, 
certifying the number and class of shares held by each, shall be furnished 
by the Secretary.

     SECTION 1.07.  VOTING FOR DIRECTORS.  Directors shall be elected by the 
majority vote of all stockholders entitled to vote. Each stockholder will 
have one and only one vote (cumulative voting is prohibited) for each 
position on the Board of Directors for which an election is being held.


                                  ARTICLE II.

                               BOARD OF DIRECTORS

     SECTION 2.01.  POWERS.  The business and affairs of the Corporation 
shall be managed by its Board of Directors. The Board of Directors may 
exercise all the powers of the Corporation, except such as are by statute or 
the charter or by By-Laws conferred upon or reserved to the stockholders. The 
Board of Directors shall keep full and fair accounts of its transactions.

     SECTION 2.02.  NUMBER OF DIRECTORS.  The number of directors of the 
Corporation shall be FOUR (4). By vote of three which constitute a majority 
of the entire Board of Directors, the number of directors may be increased or 
decreased, from time to time, to not exceeding twenty nor less than three 
directors.

     SECTION 2.03.  ELECTION OF DIRECTORS.  Until the first annual meeting of 
stockholders or until successors are duly elected and qualify, the Board 
shall consist of the persons named as such in the Charter. At the first 
annual meeting of stockholders and at each annual meeting thereafter, the 
stockholders shall elect directors to hold office until the next succeeding 
annual meeting or until their successors are elected and qualify. At any 
meeting of stockholders, duly called, the stockholders may, by the 
affirmative vote of the holders of a majority of the votes entitled to be 
cast thereon, remove any director or directors from office and may elect a 
successor or successors to fill any resulting vacancies for the unexpired 
terms of removed directors.

     SECTION 2.04.  VACANCIES.  Any vacancy occurring in the Board of 
Directors for any cause other than by reason of an increase in the number of 
directors may be filled by a majority of the remaining members of the Board 
of Directors, even if such remaining members do not constitute a quorum. Any 
vacancy occurring by reason of an increase in the number of directors may be 
filled by action of a majority of the entire Board of Directors. A director 
elected by the Board of Directors to fill a vacancy shall be elected to hold 
office until the next annual meeting of stockholders or until his successor 
is elected and qualifies.



                                      3.

     SECTION 2.05.  REGULAR MEETINGS.  After each meeting of stockholders at 
which a Board of Directors shall have been elected, the Board of Directors so 
elected shall meet as soon as practicable for the purpose or organization and 
the transaction of other business at such time as may be designed by the 
stockholders at such meeting. The first meeting shall be held at the place 
designated by the Board of Directors for such first regular meeting or at the 
office of the Corporation in Howard County, Maryland. No notice of such first 
meeting shall be necessary if held as hereinabove provided. Other regular 
meetings of the Board of Directors of Maryland as may be designated from time 
to time by the Board of Directors.

     SECTION 2.06.  SPECIAL MEETINGS.  Special meetings of the Board of 
Directors may be called at any time by the President or by a majority of the 
Board of Directors by vote at a meeting, or in writing with or without a 
meeting. Such special meetings shall be held at such place or places within 
or without the State of Maryland as may be designated from time to time by 
the Board of Directors.

     SECTION 2.07.  NOTICE OF MEETINGS.  Except as provided in Section 2.05, 
notice of the place, day and hour of every regular and special meeting shall 
be given to each Director two days (or more) before the meeting, by 
delivering the same to him personally, or by sending the same to him by 
telegraph, or by leaving the same at his residence or usual place of 
business, or, in the alternative, by mailing such notice three days (or more) 
before the meeting, postage prepaid, and addressed to him at his last known 
post office address, according to the records of the Corporation. Unless 
required by these By-Laws or by resolution of the Board of Directors, no 
notice of any meeting of the Board of Directors need state the business to be 
transacted thereat. No notice of any meeting of the Board of Directors need 
by given to any Director who attends, or to any Director who, in writing 
executed and filed with the records of the meeting either before or after the 
holding thereof, waives such notice. Any meeting of the Board of Directors, 
regular or special, may adjourn from time to time to reconvene at the same or 
some other place, and no notice need by given of any such adjourned meeting 
other than by announcement.

     SECTION 2.08.  QUORUM.  At all meetings of the Board of Directors the 
presence of a two-thirds' majority of the entire Board of Directors shall 
constitute a quorum for the transaction of business. Except in cases in which 
it is by stature, by the Charter or by the By-Laws otherwise provided, the 
vote of a simple majority of such quorum at a duly constituted meeting shall 
be sufficient to elect and pass any measure. In the absence of a quorum, the 
Directors present by majority vote and without notice other than by 
announcement may adjourn the meeting from time to time until a quorum shall 
attend.

     SECTION 2.09.  INFORMAL ACTION BY DIRECTORS.  Any action required or 
permitted to be taken at any meeting of the Board of Directors or of any 
committee thereof may be taken without a meeting, if a written consent to 
such action is signed by all members of the Board or of such committee, as 
the case may be, and such written consent is filed with the minutes of 
proceedings of the Board or committee.



                                       4.

                                  ARTICLE III.

                                    OFFICERS

     SECTION 3.01.  EXECUTIVE OFFICERS.  The Board of Directors shall choose 
a President from among the Directors, and a Secretary and a Treasurer who 
need not be directors. The Board of Directors may choose one or more Vice 
Presidents. Any two or more of the above-mentioned offices, except those of 
President and a Vice President, may be held by the same person; but no 
officer shall execute, acknowledge or verify any instrument in more than one 
capacity if such instrument be required by statute, by the Charter, by the 
By-Laws or by resolution of the Board of Directors to be executed, 
acknowledged or verified by any two or more officers. Each such officer shall 
hold office until the first meeting of the Board of Directors after the 
annual meeting of stockholders next succeeding his election, and until his 
successor shall have been duly chosen and qualified, or until he shall have 
resigned or shall have been removed. Any vacancy in any of the above offices 
may be filled for the unexpired portion of the term of the Board of Directors 
at any regular or special meeting.

     SECTION 3.02.  PRESIDENT.  The President shall preside at all meetings 
of the stockholders and of the Board of Directors at which he shall be 
present; he shall have general charge and supervision of the business of the 
Corporation; he may sign and execute, in the name of the Corporation, all 
authorized deeds, mortgages, bonds, contracts or other instruments, except in 
cases in which the signing and execution thereof shall have been expressly 
delegated to some other officer or agent of the Corporation; and, in general, 
he shall perform all duties incident to the office of a president of a 
corporation, and such other duties as, from time to time, may be assigned to 
him by the Board of Directors.

     SECTION 3.03.  VICE PRESIDENTS.  The Vice President or Vice Presidents, 
at the request of the President or in his absence or during his inability to 
act, shall perform the duties and exercise the functions of the President, 
and when so acting shall have the powers of the President. If there be more 
than one Vice President, the President may determine which one or more of the 
Vice Presidents shall perform any of such duties or exercise any of such 
functions; otherwise any of the Vice Presidents may perform any of such 
duties or exercise any of such functions. The Vice President or Vice 
Presidents shall have such other powers and perform such other duties as may 
be assigned to him or them by the Board of Directors or the President.

     SECTION 3.04.  SECRETARY.  The Secretary shall keep the minutes of the 
meetings of stockholders, of the Board of Directors, and of any committees, 
in books provided for the purpose; he shall see that all notices are duly 
given in accordance with the provisions of the By-Laws or as required by law; 
he shall be custodian of the records of the Corporation; and, in general, he 
shall perform all duties incident to the office of a secretary of a 
corporation, and such other duties as, from time to time, may be assigned to 
him by the Board of Directors or the President.



                                      5.

     SECTION 3.05.  TREASURER.  The Treasurer shall have charge of and be 
responsible for all funds, securities, receipts and disbursements of the 
Corporation, and shall deposit or cause to be deposited, in the name of the 
Corporation, all moneys or other valuable effects in such banks, trust 
companies or other depositories as shall, from time to time, be selected by 
the Board of Directors; he shall render to the President and to the Board of 
Directors whenever requested, an account of the financial condition of the 
Corporation, and, in general, he shall perform all the duties incident to the 
office of a treasurer of a corporation, and such other duties as may be 
assigned to him by the Board of Directors or the President.

     SECTION 3.06.  SUBORDINATE OFFICERS.  The Board of Directors may from 
time to time appoint such subordinate officers as it may deem desirable. Each 
such officer shall hold office for such period and perform such duties as the 
Board of Directors or the President may prescribe. The Board of Directors, 
may from time to time authorize any committee or officer to appoint and 
remove subordinate officers and prescribe the duties thereof.

     SECTION 3.07.  COMPENSATION.  The Board of Directors shall have power to 
fix the compensation of all officers of the Corporation.

     SECTION 3.08.  REMOVAL.  Any officer or agent of the Corporation may be 
removed by the Board of Directors whenever, in its judgment, the best 
interest of the Corporation will be served thereby, but such removal shall be 
without prejudice to the contractual rights, if any, of the person so removed.


                                 ARTICLE IV.

                                    STOCK

     SECTION 4.01.  CERTIFICATES.  Each stockholder shall be entitled to a 
certificate or certificates which shall represent and certify the number and 
kind of shares of stock owned by him in the Corporation. Such certificates 
shall be signed by the President or a Vice President and countersigned by the 
Secretary or Treasurer. Stock certificates shall be in such form, not 
inconsistent with law or with the Charter, as shall be approved by the Board 
of Directors. In case any officer of the Corporation who has signed any 
certificate ceases to be an officer of the Corporation, whether because of 
death, resignation or otherwise, before such certificate is issued,the 
certificate may nevertheless be issued and delivered by the Corporation as if 
the officer had not ceased to be such officer as of the date of its issue.

     SECTION 4.02.  TRANSFERS.  The Board of Directors shall have power and 
authority to make such rules and regulations as it may deem expedient 
concerning the issue and transfer of certificates of stock.

     SECTION 4.03.  STOCK LEDGERS.  Original or duplicate stock ledgers 
containing the names and addresses of the stockholders of the Corporation and 
the number of shares of each class held by them respectively, shall be kept 
at an office of the Corporation.



                                      6.

     SECTION 4.04.  RECORD DATES.  The Board of Directors is hereby empowered 
to fix, in advance, a date as the record date for the purpose of determining 
stockholders entitled to notice of, or to vote at, any meeting of 
stockholders, or stockholders entitled to receive payment of any dividend or 
the allotment of any rights, or in order to make a determination of 
stockholders for any other proper purpose.

     SECTION 4.05.  NEW CERTIFICATES.  In case of any certificate of stock is 
lost, stolen, mutilated or destroyed, the Board of Directors may authorize 
the issuance of a new certificate in place thereof upon such terms and 
conditions as it may deem advisable; or the Board of Directors may delegate 
such power to any officer or officers of the Corporation; but the Board of 
Directors or such officer or officers, in their discretion, may refuse to 
issue such new certificate save upon the order of some court having 
jurisdiction in these premises.

                                ARTICLE V.

                                 FINANCE

     SECTION 5.01.  CHECKS, DRAFTS, ETC.  Checks, drafts and orders for the 
payment of money, notes and other evidence of indebtedness, issued in the 
name of the Corporation in the amount of Fifty Thousand Dollars ($50,000) or 
less, shall, unless otherwise provided by resolution of the Board of 
Directors, be signed by either the President, Vice President-Finance, or the 
Treasurer.

     Checks, drafts and orders for the payment of money, notes and other 
evidence of indebtedness, issued in the name of the Corporation in an amount 
in excess of Fifty Thousand Dollars ($50,000), shall, unless otherwise 
provided by resolution of the Board of Directors, be signed by both the 
President, Vice President-Finance, or the Treasurer jointly.

     SECTION 5.02.  ANNUAL REPORTS.  There shall be prepared annually a full 
and correct statement of the affairs of the Corporation, including a balance 
sheet and a financial statement of operations for the preceding fiscal year, 
which shall be submitted at the annual meeting of the Board of Directors and 
filed within twenty days thereafter at the principal office of the 
Corporation in this State.

                                ARTICLE VI.

                             SUNDRY PROVISIONS

     SECTION 6.01.  AMENDMENTS.  Any and all provisions of the By-Laws may be 
altered or repealed and new By-Laws may be adopted at any annual meeting of 
the stockholders, or at any special meeting called for that purpose. In 
addition, the Board of Directors shall have the power, at any regular or 
special meeting thereof, to make and adopt new by-laws or to amend, alter or 
repeal any by-law of the Corporation.



                  AMENDMENT TO BY-LAWS OF 
            PATRICK AIRCRAFT TANK SYSTEMS, INC.

     The undersigned, being the sole shareholder of PATRICK AIRCRAFT TANK 
SYSTEMS, INC., a Maryland corporation, hereby amends the By-Laws of the 
Corporation as follows:

     a. by deleting from Article III Section 3.01. EXECUTIVE OFFICERS the 
        words "from among the Directors;" from the second line thereof.

     b. by adding the following sentence between the first and second sentence 
        thereof:

             The Board of Directors may also elect a chief executive officer 
             and a chief financial officer, each to perform such duties as 
             may be ascribed to the office by the Board of Directors.

     In all other respects the By-Laws shall remain unchanged.

     This Amendment has been adopted by the sole shareholder in lieu of a 
special meeting called for that purpose pursuant to Section 2-408(c) of the 
Corporations and Associations Article of the MARYLAND ANNOTATED CODE (1993 
Repl. Vol., as amended).

WITNESS:                               PATS, Inc., a Maryland corporation
                                       Sole Shareholder
 
 /s/ Steve Tepper                      By:  /s/ John R. Hinson
- --------------------                      ----------------------- (SEAL)
  Steve Tepper                             John R. Hinson
                                           Chief Financial Officer