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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 05−10−2
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
POWER SECTION AND ACCESSORY GEARBOX (CONT'D)
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.
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
GENERATOR ADAPTER (CONT'D)
Components and Operation
APU Generator
The APU generator adapter drives a 30 kVA, 400 Hz, three-phase AC generator. The generator
is identical to the engine-driven generators, providing a backup source of 115V/400 Hz electrical
power for all aircraft systems, up to an altitude of 20,000 feet.
Refer to Chapter 7, Electrical, for additional information on electrical generation.
Generator Adapter Lubrication
Generator adapter lubrication is independent from the accessory gearbox lubrication, and has
a separate filler cap with an 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 comes from the normal APU fuel feed via the
right main tank. If the normal fuel feed is not available, generator adapter oil cannot be cooled,
and APU operating time is limited.
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
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
Vol. 2 05−10−5
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
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.
Components and Operation
Air Intake
The air intake is an s-shaped duct, equipped with an inlet screen and a water trap (with
associated drain line). The intake is attached to the top of the APU enclosure.
Intake Scoop
A permanent fixed intake scoop is located aft of the APU inlet opening. The purpose of the
scoop is to increase inlet ram air recovery, providing for increased performance and decreased
APU EGT.
Exhaust
The APU exhaust nozzle (tailpipe) directs exhaust gases from the APU into the exhaust duct,
located below the right engine. The nozzle is smaller in diameter than the exhaust duct, and
therefore acts as an ejector, drawing air inside the enclosure and mixing it with the exhaust
gases. This method cools the exhaust gases, and also establishes a ventilation flow in the
enclosure by drawing cooling air via the spring-loaded flapper door, installed on the opposite
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