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Combustor . Contains 10 fuel nozzles and 2 igniters.
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Turbine . Two stage axial flow turbine which drives the compressor/gearbox.
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Gearbox . Provides the sump for the lubrication system and mounting of component and accessories.
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Exhaust . The flow across the APU and oil cooler is created by utilizing the exhaust discharge velocity.
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Monitor zones for fire/overheat/smoke events, FIDEEX system health and status.
APU SYSTEM SCHEMATIC
NOTE
THE AIR SYSTEM IS SHOWN WITH AN APU BLEED LOAD
BLEED AIR
DUCT
TO AIRCRAFT BLEED AIR SYSTEM LOAD CONTROL VALVE SURGE VALVE SURGE DUCT AIRCRAFT SKIN FADEC
OIL OUT OIL IN AIR/OIL COOLER TO APU COMPARTMENT GEARBOX BLEED AIR CHECK VALVE INLET BLEED DIFFUSER COMBUSTION EDUCTOR FROM/TO APU SYSTEMS FROM/TO AIRCRAFT SYSTEMS
STARTER
GEN TURBINE
EXHAUST
FUEL CONTROL OIL UNIT PUMP
COMPRESSOR
INLET AIR BLEED AIR APU COMPARTMENT AIRFLOW ELECTRICAL CIRCUITS
GF0510_003
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
AUXILIARY POWER UNIT
APU SYSTEM SCHEMATIC (CONT'D)
Lubrication
The lubrication system incorporates an integral oil reservoir. The two main areas that are lubricated are the gearbox and turbine bearings.
The gearbox sump is the reservoir and can be filled through the fill cap. The APU can also be serviced on ground only, using the airplane remote oil replenishment system, simplifying post flight maintenance actions.
The lubrication system consists of the following components:
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Oil filters . Lube and generator scavenge.
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Oil temperature sensor . Sends an input to the FADEC for both minimum oil temperature and high oil temperature protection. When oil temperature increases to a high predetermined value for 10 seconds, the APU (on ground only) will shut down.
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Low Oil Pressure (LOP) switch . When pressure drops below a predetermined PSIG after the APU has reached on-speed (not less than 99%) for 15 seconds, the APU (on ground only) will shut down automatically.
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Oil cooler . Will bypass oil at a predetermined lower than normal operating temperature and flow through the cooler when temperatures are above the normal operating range.
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Magnetic Chip Collector (visual inspection) . Provides visual indication of metal particles within the system.
Oil Pressure
On the prestart BITE check, the LOP switch is checked by the FADEC. During operation, if oil pressure decreases below a predetermined PSIG for approximately 15 seconds (on ground), automatic shutdown will occur. An “APU OIL LO PRESS”caution message will come on for 15 seconds and will be replaced by a cyan “APU SUTDOWN“ advisory.
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