A general purpose maintenance trainer, which has the potential to simulate a wide variety of electronic equipments without hardware changes or new computer programs, has been developed and field tested by the Navy. Based on a previous laboratory model, the Generalized Maintenance Trainer Simulator (GMTS) is a relatively low cost trainer that offers intensive training in equipment set-up, troubleshooting, and system assessment. It uses a software database and microfiche photographs to simulate electronic equipment, and the executive computer programs that manage all interactions between students and the system are programmed in UCSD Pascal. A database representing a satellite communications system was also developed to demonstrate the trainer's capabilities and to permit gathering of supportability data. The GMTS hardware and software have been refined and documented to meet the research objective of providing the intensive training desired at low cost. Testing and evaluation of the trainer in the school environment are scheduled. (MER)