The diagnostic equipment defined in this specification is intended for use in detecting and isolating intermittent faults in LRUs/WRAs (see 6.5.12 and 6.5.19) chassis and backplane circuits and their wire harnesses; weapon system EWIS (see 6.5.4); and patch cables, electronic test cables and their connectors. The diagnostic equipment may be used on weapon system EWIS or with the EWIS component or LRU/WRA removed from the weapon system. When testing is performed off-weapon system, on LRUs/WRAs, the SRAs/SRUs are typically removed. The off-weapon system units under test (EWIS component or LRU/WRA) are stimulated by temperature, vibration, or vibration/temperature to emulate the operating environment in which the fault originally occurred. When the diagnostic equipment is used to isolate and detect intermittent faults in EWIS components installed on the weapon system, the UUT is isolated and disconnected from other system LRUs/WRAs. This test method is limited in its ability to emulate the aircraft/weapon system's operating environment, which limits the ability to isolate and detect intermittent faults. Appendix A, B, and C provide recommended guidance for defining the simulated operating environment.