Aircraft type. * Boeing 777-300ER APU engine. * Honeywell 331-500 Aircraft systems explained * Auxiliary power unit * Electrical load management system Major components covered. * Main and APU battery, power distribution panel, APU engine, air inlet duct, inlet door, apu dc pump, electric actuator, fuel cluster, ignition unit, igniter plug and APU controller. * Reverse flow annular combustor, centrifugal compressor, axial flow turbine, swirler, fuel nozzle, accessory gearbox, electric starter, pawl clutch mechanism, impeller, diffuser, stator, rotor, exhaust duct and fuel manifolds. Software's used for making the video. * Blender 3.6 and Filmora 10 Background music used in the video. * (Filmora stock library)