(engine driven generators, auxiliary power units), gas turbine compressor/air turbine motor (APU, GTC, ATM), ice and rain protection (engine and nacelle anti-ice, window heat, probe heater), oxygen, fire and overheat protection of all systems, liquid cooling system, draw through cooling system, forced air cooling system, and powered flying controls.

FEs are also responsible for preflight and postflight aircraft inspections, and ensuring that the weight and balance of the aircraft is correctly