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APU NEG-G SOV
APU negative-G shutoff valve is open with the APU FIRE PUSH switch
activated, or the negative-G shutoff valve position does not match the APU
PWR FUEL switch position, within 5 seconds.
APU OIL PRESS APU oil pressure or APU adapter oil pressure is low and the APU will shut
down.
APU OIL TEMP APU oil temperature or APU adapter oil temperature exceeds limits and the
APU will shut down.
APU PUMP APU fuel pump has failed.
APU SOV CLSD APU fuel shutoff and negative-G shutoff valves have closed after actuation of
the APU FIRE PUSH switch/light.
AUXILIARY POWER UNIT
Description APU 100E
Vol. 2 05−10−24
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
GENERAL
A Honeywell 36–150(CL) constant-speed gas turbine auxiliary power unit (APU) is installed within a
fire-resistant compartment in the aft equipment bay.
The APU drives a generator, providing AC electrical power, that serves as a backup AC power
source up to an altitude of 20,000 feet. The APU also provides pressurized bleed air to the
10th-stage manifold for engine starting up to 15,000 feet. In-flight APU bleed air extraction for air
conditioning is not permitted above 15,000 feet.
The maximum operating altitude of the APU is 20,000 feet MSL. In-flight APU starting is guaranteed
up to 20,000 feet, from 141 to 290 KIAS.
APU Enclosure
The APU enclosure is a stainless-steel, fire-resistant box with dedicated fire detection and fire
extinguishing capabilities. The enclosure is located in the forward section of the aft equipment bay,
and is equipped with a service door for APU oil servicing. A spring-loaded closed flapper door is
located on the left side of the enclosure, and opens to provide cooling airflow while the APU is
operating.
Refer to Chapter 9, Fire Protection, for information on the APU fire detection/extinguishing
systems.
Auxiliary Power Unit (APU)
Figure 05−15−1
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−1
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
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
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−2
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 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.
APU Power Section and Accessory Gearbox
Figure 05−15−2
AUXILIARY POWER UNIT
Description APU 150
Vol. 2 05−15−3
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-phase AC generator. The generator
is identical to the engine-driven generators, providing a backup source of 115V/400 Hz electrical
　
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