Airborne Auxiliary Power

For reports of basic engine defects such as compressor, turbine, cases other than specific systemsshown in other APU sub-systems such as fuel, ignition, exhaust, starting and controls. The APU makeand model should be included if available. Typical parts are turbine, bearing, seal, impeller, blade, case,burner can, etc.

Turbocharging

The turbines which extract energy from the exhaust gases and are coupled to the crankshaft onreciprocating engines. Includes the power recovery turbine unit when external to the engine. The driveshaft, coupling, and gears are filed in JASC code 8540.

Air Conditioning

For reports of the cabin pressurization system, pressure indicators, and associated system parts.

Airborne Auxiliary Power

The system and components which furnishes fuel from the aircraft tanks to the APU fuel control andassociated injector nozzles. Including the unit which provides fuel at the proper pressure for fuel controloperation; and the unit controlling and injecting metered fuel to the engine burner can section. Typicalparts are shutoff valve, line, fitting, etc.

Turbocharging

For reports of airframe or engine manufacturer furnished exhaust driven turbocharger systems includingthe turbocharger unit, density controller and waste gate valve. Does not include the tailpipe. Typicalparts are clamp, coupling, rod end, bracket, hose, scroll, bearing, impeller, shaft, etc.

Air Conditioning

For reports of outflow/dump valves and associated parts such as linkage, filter, diaphragm, etc.

Airborne Auxiliary Power

The system units used to start the APU engine. Including the unit which provides a power source to theigniter during the starting cycle. Typical parts are ignition unit, magneto, igniter, starter, etc.

Turbocharging

For reports indicating a problem with wiring specific to the Turbocharger System.

Air Conditioning

The units and systems, which measure differential, pressure and transmit a signal. Typical parts are pressure switch, transducer, etc.

Airborne Auxiliary Power

The system and components which provide and control a source of pressure and high volume of air foraircraft using systems such as engine starting, cabin air conditioning prior to starting engines. Typicalparts are duct, bleed valve, clamp, seal, etc.