AUXILIARY POWER UNIT
Volume 2
Flight Crew Operating Manual
Sep 13/2004
05-01-04
CSP 100-6
REV 1
POWER SECTION AND GEARBOX
DESCRIPTION
The power section of the Honeywell 36-150BD APU 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 for operation of the gearbox-
mounted accessories.
The APU contains the following components:
- Single-stage centrifugal compressor
- Single-stage radial turbine
- Accessory gearbox with an integral oil reservoir
- Annular reverse flow combustor
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 single-stage radial turbine. The rotating shaft
of the turbine rotor drives the compressor, output drive shaft, and accessories.
GAS GENERATOR
The gas generator contains the following components:
- Compressor
- Annular reverse flow combustion chamber
- Turbine
GEARBOX ASSEMBLY
The gearbox assembly provides power transfer from the starter motor to the accessories and power section during APU
starting as well as to all gearbox-mounted accessories during on-speed operation.
The APU accessories include:
- Starter
- DC Generator
- Oil pump
- Speed sensor
- Fuel control unit and high-pressure pump
The APU gearbox also serves as a sump for the lubrication system and incorporates the oil gravity fill cap and quantity
sightglass.
V 1
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