Commanders independent thermal viewer and hull/turret electronics unit-built-in test and diagnostics: Two different approaches to meeting the M1A2 supportability requirements

Two subsystems have been developed for the General Dynamics M1A2 Main Battle Tank. They are the commander´s independent thermal viewer (CITV) and the hull/turret electronics unit (H/TEU). The built-in test and embedded diagnostics for each of these systems support the requirements for elimination of special test equipment at the tank level, and use of standard Army test equipment for test and repair at higher echelons of maintenance. The implementation of built-in test/diagnostics in these two systems was quite different, despite the fact that the functional requirements were identical