electronic ground support test equipment, namely, fuel quantity testers, fuel quantity sensors, air data testers, air data sensors, turbine temperature testers, turbine temperature sensors, pressure testers and cable tensiometers

repair of aircraft and related equipment, namely, gyros, hydraulic equipment, hydro-mechanical equipment, seats, smoke detectors, emergency locator transmitters and avionics equipment, namely, altimeters, navigation instrumentation, air data monitoring devices, electronic and electrochemical instruments