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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.
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.
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−4
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
GENERATOR ADAPTER (CONT'D)
APU Generator Adapter
Figure 05−15−3
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−5
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.
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 from 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
side of the APU enclosure.
Heat Shield
The exhaust gas heat shield is installed on the aft side of the fuselage, below the right engine
pylon. The heat shield is used to minimize the exhaust gas impact on the aircraft skin.
EGT Indications
APU exhaust gas temperature is represented on the EICAS, using an indicating arc that
expands and contracts as APU operating limits change, and a digital readout that is displayed in
degrees Celsius.
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−6
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
AIR INTAKE AND EXHAUST (CONT'D)
Air Intake, Exhaust and Indication
Figure 05−15−4
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−7
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
APU FUEL DISTRIBUTION
Description
The APU fuel system provides fuel for APU start, acceleration, and governed speed control.
During start, the fuel system provides the correct amount of fuel to support combustion, and
ensures smooth acceleration of the engine to full power. Once full power is reached, fuel flow is
modulated, as necessary, to meet the demands of varying pneumatic and electrical loads, while
maintaining a constant speed.
The normal fuel supply to the APU is from the right main tank. A backup fuel supply from the left
engine fuel feed manifold is provided in case negative-G conditions are encountered.
Components and Operation
APU Fuel Pump
The DC battery bus powers the APU fuel pump, which draws fuel from the right main tank. The
pump provides fuel to the fuel control unit through the APU’s feed line and the fuel shutoff valve.
A portion of the fuel from the APU fuel pump is directed to the APU fuel control unit for
combustion, while the remainder is routed through the fuel/oil heat exchanger to provide cooling
　
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