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REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
POWER SECTION AND ACCESSORY GEARBOX
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.
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
accessories and power section 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
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−2
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
POWER SECTION AND ACCESSORY GEARBOX (CONT'D)
Gearbox Lubrication
The APU accessory gearbox also serves as an oil reservoir and wet-sump lubrication system.
A filler cap with integrated dipstick is incorporated for gearbox oil servicing. Gearbox oil cooling
is achieved by directing airflow over 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.
APU Power Section and Accessory Gearbox
Figure 05−10−2
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−3
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
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.
Components and Operation
APU Generator
The APU generator adapter drives a 30 kVA, 400-Hz, three-cycle AC generator used as a
backup electrical power supply for the aircraft. The APU generator is identical to the
engine-driven generators, and is primarily used during ground operations. If the APU generator
is being used to supply electrical power in flight, bleed air extraction from the APU is not
permitted (see Chapter 7, Electrical, for additional information).
NOTE
Use of APU generator in flight is not permitted unless both main
generators have failed or are off-line.
Generator Adapter Lubrication
The generator adapter lubrication system is independent from the accessory gearbox
lubrication system, and has a separate filler cap with integrated dipstick for servicing.
NOTE
Wait a minimum of 30 minutes after APU shutdown to allow the
generator adapter oil level to stabilize. Otherwise, quantity
indications may be inaccurate, and the adapter may be overfilled.
The oil within the generator adapter lubrication system is cooled by a fuel/oil heat exchanger.
The cooling fuel supply to the heat exchanger is from the normal APU fuel feed from the right
main tank. If the normal fuel feed is not available, generator adapter oil will not be cooled, and
APU operating time will be limited.
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−4
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
GENERATOR ADAPTER (CONT'D)
CAUTION
Generator adapter oil pressure is high immediately after APU
shutdown. Prior to opening the APU generator adapter oil filler
cap, push and hold the pressure-relief valve cap for five seconds.
This action releases pressure from the APU generator adapter
housing.
APU Generator Adapter
Figure 05−10−3
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−5
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
AIR INTAKE AND EXHAUST
Description
The APU air intake is located on the upper left portion of the aft fuselage, near the base of the
vertical stabilizer. The opening of the intake is flush with the fuselage.
APU exhaust gases are expelled through an exhaust and exit on the right side of the aft fuselage.
　
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