BUILT-IN TEST SYSTEM FOR AIRCRAFT INDICATION SWITCHES

摘要

A built-in test system (10) for aircraft indication switches comprises a plurality of aircraft indication switches (11, 12, 13) and a first resistor adding network having input resistors (20, 21, 22) individually connected to first contacts of different ones of the indication switches. The test system further includes a second resistor adding network having input resistors (30 , 31, 32) individually connected to second contacts of different ones of the indication switches. Output circuitry is provided for coupling outputs of th e first and second resistor adding networks to an electronic control unit for the aircraft.