SILs, such as the Integration Facility for Avionic Systems Testing (IFAST),  are facilities designed to test the performance and compatibility of components, subsystems and systems when they are integrated with other systems or functions. They are used to evaluate individual hardware and software interactions and, at times, involve the entire weapon system avionics suite. A variety of computer simulations and test equipment are used to generate scenarios and environments to test for functional performance, reliability, and safety. SILs are generally weapon system specific and are found in both contractor and government facilities.
     SILs often employ a variety of real-time/near-real-time digital models and computer simulations to generate scenarios and multi-spectral backgrounds. These models are interfaced with brassboard, prototype, or actual production hardware and software of the systems under test. SILs are used from the beginning of an EW system�s development through avionics integration and fielding. Moreover, SILs continue to be used to support the testing of hardware and software modifications or updates occurring throughout an EW system�s operational life.

See
IFAST