GOVERNMENT CONTRACT AWARDS

* Litton Systems Inc. of Northridge won a $542,895 contract from the Navy in Philadelphia for lab equipment.

* Litton Systems Inc. of Northridge won a $392,585 contract from the Navy in Philadelphia for aircraft components.

* Litton Systems Inc. of Northridge won a $379,294 contract from the Navy in Philadelphia for communications equipment.

* HR Textron Inc. of Valencia won a $345,504 contract from the Defense Supply Center in Columbus, Ohio, for engine accessories.

* Llamas Plastics Inc. of Sylmar won a $313,908 contract from the Defense General Supply Center in Richmond, Va., for aircraft components.

* A.E. Schmidt Environmental of Van Nuys won a $232,380 contract from the Marine Corps in Twenty-Nine Palms for maintenance services.

* Westfield Precision Products Inc. of Sun Valley won a $158,455 contract from the Navy in Philadelphia for pinion assembly.

* Litton Systems Inc. of Woodland Hills won a $139,755 contract from the Navy in Philadelphia for electrical components.