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The maximum operating altitude of the APU is 20,000 feet MSL. In-flight APU starting is guaranteed up to 20,000 feet, from 141 to 290 KIAS.
APU Enclosure
The APU enclosure is a stainless-steel, fire-resistant box with dedicated fire detection and fire extinguishing capabilities. The enclosure is located in the forward section of the aft equipment bay, and is equipped with a service door for APU oil servicing. A spring-loaded closed flapper door is located on the left side of the enclosure, and opens to provide cooling airflow while the APU is operating.
Refer to Chapter 9, Fire Protection, for information on the APU fire detection/extinguishing systems.
Auxiliary Power Unit (APU)
Figure 05.10.1
AUXILIARY POWER UNIT Description Vol. 2 05.10.2
Oct 05/06
Description
The APU power section consists of a gas turbine engine with integrated oil, ignition, and start systems. The power section drives a gearbox that reduces the rotational speed of the APU to a speed appropriate for operation of gearbox-mounted accessories.
The APU powerplant consists of the following groups:
.
Compressor
.
Combustor
.
Turbine
.
Accessory gearbox
.
Exhaust
Components and Operation
Power Section
Engine power is developed through compression of ambient air by a centrifugal compressor. The compressed air, when mixed with fuel and ignited in the annular reverse-flow combustor, drives a turbine. The rotating shaft of the turbine rotor drives the compressor and the drive shaft of the accessory gearbox.
Accessory Gearbox
The APU accessory gearbox assembly provides power transfer from the starter motor to the power section and accessories during APU starting, and to all gearbox-mounted accessories during on-speed rotation. The accessories include:
.
Start motor
.
Generator adapter
.
Speed (rpm) sensor, oil temperature and oil pressure switches
.
Lubrication module
.
Fuel control unit
Gearbox Lubrication
The APU accessory gearbox also serves as an oil reservoir and wet-sump lubrication system. A filler cap with an integrated dipstick is incorporated for gearbox oil servicing. Gearbox oil cooling is achieved by directing airflow over the integral cooling fins, located in the lower casing of the accessory gearbox.
NOTE
Wait a minimum of 30 minutes after APU shutdown to allow the gearbox wet sump oil level to stabilize. Otherwise, quantity indications may be inaccurate, and the reservoir may be overfilled.
AUXILIARY POWER UNIT Description Vol. 2 05.10.3
Oct 05/06
APU Power Section and Accessory Gearbox
Figure 05.10.2
GENERATOR ADAPTER
Description
The generator adapter transfers APU rotational power from the gearbox to the APU generator. The adapter has a dedicated pressurized lubrication system and pressure switches that monitor oil system parameters.
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