Amendment to Lease


     Agreement  made  this  30th  day of  June  1997  by and  between  PARKLANDS
PROPERTIES  TRUST, a Massachusetts  voluntary  association  having its principal
office in Boston,  Massachusetts  (hereinafter  "Landlord") and SENCORP SYSTEMS,
INC., a Delaware corporation,  having an office at 400 Kidds Hill Road, Hyannis,
Massachusetts 02601 (hereinafter "Tenant").

     WHEREAS,  the parties  entered into a certain lease dated  December 8, 1989
for the  premises  known as  building  No. 7 at 400 Kidds  Hill  Road,  Hyannis,
Massachusetts 20601 (the "Lease"); and

     WHEREAS,  the  parties  amended the lease in the  Amendment  to Lease dated
April 20, 1992; and

     WHEREAS, the parties wish to further amend the Lease as amended,

     NOW THEREFORE, for good and valuable consideration, the receipt of which is
hereby acknowledged, the parties agree as follows:

     1.  Article 26, paragraph (a) is hereby amended by striking "five (5) years
     (the "Second  Renewal Term")  commencing on January 1, 1998 and expiring on
     December 31, 2002," and substituting therefor the following:  "one (1) year
     (the  "Second  Renewal  Term")  commencing  January 1, 1998 and expiring on
     December 31, 1998,".

     2.  Article 26, paragraph  (c)(iii) is hereby amended by striking "the FMV"
     and substituting therefor the following: "$4.20 per square foot."

     3.  Article  27,  paragraph  (a), is hereby  amended by  striking  the last
     sentence in its entirety and substituting therefor the following:  "If said
     Option is exercised at any time after January 1, 1995,  the purchase  price
     will be $2,750,000.00."

     4.  Except as  expressly  amended  herein,  all the  terms,  covenants  and
     provisions  of the Lease as amended  shall  remain in full force and effect
     and are hereby ratified and confirmed, in their entirety.

<PAGE>

     5. Execution by the parties of this  Amendment To Lease hereby  constitutes
     Tenant's Second Notice,  as to renewal of said Lease for the Second Renewal
     Term, as required under Article 26, paragraph (a), thereof.

     IN WITNESS WHEREOF, the parties hereto have set their hands and seals as of
the day and year first above written.


LANDLORD:                               TENANT:
PARKLANDS PROPERTIES TRUST              SENCORP SYSTEMS, INC.


By: /s/ John D. Bambara                 By: /s/ Anthony Giovannone
   ----------------------------             -------------------------------
         John D. Bambara                          Anthony Giovannone
                                                      President


                         COMMONWEALTH OF MASSACHUSETTS

Barnstable, ss.                                                    June 30, 1997

     Then  personally  appeared the  above-named  John D. Bambara,  a Trustee of
Parklands  Properties  Trust,  a  Massachusetts   voluntary   association,   and
acknowledged  the  foregoing  to be his free act and deed in his  capacity  as a
Trustee and the free act and deed of said association, before me.


                                        /s/ Lynn G. Hall
                                        -----------------------------------
                                        Notary Public
                                        My Commission Expires:  3/11/99


                         COMMONWEALTH OF MASSACHUSETTS

Barnstable, ss.                                                    June 30, 1997

     Then personally  appeared the  above-named  Anthony  Giovannone,  President
SENCORP SYSTEMS,  INC., a Delaware corporation and acknowledged the foregoing to
be his free act and deed of said corporation, before me.


                                        /s/ Lynn G. Hall
                                        -----------------------------------
                                        Notary Public
                                        My Commission Expires:  3/11/99