AUXILIARY POWER UNIT
Sep 13/2004
Flight Crew Operating Manual
Volume 2
REV 1
CSP 100-6
05-01-05
AIR INTAKE AND EXHAUST
DESCRIPTION
The APU air intake is located above the APU compartment on the right side of the fuselage, below the vertical stabilizer.
The APU exhaust gases are discharged by an exhaust duct and eductor through the tailcone of the aircraft.
COMPONENTS AND OPERATION
EXHAUST
The exhaust duct is covered by an insulated exhaust muffler.
EXHAUST GAS TEMPERATURE
The APU exhaust gas temperature (EGT) is displayed as a digital readout on the EICAS.
LUBRICATION SYSTEM
DESCRIPTION
The APU has a self-contained lubrication system. Major components include a gearbox mounted oil pump and an integral
gearbox oil sump. Intake air cools oil and ventilates of the APU enclosure. A magnetic chip collector provides visual indi-
cation of metal particles in the lubrication system.
COMPONENTS AND OPERATION
The oil pump directs filtered oil under pressure to the APU bearings, gearbox, and generator bearings.
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