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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 gearboxmounted
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
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 indication
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.
AUXILIARY POWER UNIT
Volume 2 Flight Crew Operating Manual Sep 13/2004
05-01-06 CSP 100-6 REV 1
FUEL DISTRIBUTION
DESCRIPTION
The Honeywell 36-150BD APU fuel system is a full-authority digital electronic engine (FADEC) controlled system. During
start, the fuel system provides the correct amount of fuel to support combustion and smooth acceleration of the engine
to full power. When full power is reached, fuel flow is modulated to meet electrical and pneumatic load while maintaining
a constant engine speed.
Protection from overtemperature during APU acceleration is provided by protective features incorporated in the ECU.
The APU receives fuel from the right collector tank. The APU fuel system incorporates the right DC-powered fuel pump,
fuel feed shutoff valve (SOV), fuel shutoff solenoid, fuel system filters, a high-pressure fuel pump (mounted on the APU),
fuel control unit (FCU), and the fuel manifold assembly.
COMPONENTS AND OPERATION
APU FUEL SUPPLY
The right DC-powered fuel pump delivers fuel under pressure to the APU fuel control unit. When the right engine is running,
the fuel pump ceases operation and fuel is delivered by the main engine ejector pump.
FUEL CONTROL UNIT AND FUEL SHUTOFF SOLENOID
The APU fuel control unit (FCU) meters fuel under command of the electronic control unit (ECU). During the start sequence,
the fuel shutoff solenoid, located between the FCU and the fuel nozzles is opened by the ECU at 5% rpm. Fuel is
supplied in accordance with a schedule that accelerates the APU throughout the start sequence. When the APU is stabilized,
fuel scheduling is influenced by the rpm and EGT as well as generator and bleed air demands.
During normal or automatic APU shutdown, an overspeed signal closes the fuel solenoid valve and torque motor at the
APU and causes the APU to shutdown.
APU SHUTDOWN MODE
Engagement of the APU master switch to OFF, remote stop, emergency/fire, or in the event of an exceeded limit, the ECU
initiates the APU shutdown sequence by commanding the fuel off. When the shutdown sequence is complete, the ECU transitions
to idle mode and then powers down if the APU master switch is in the OFF position. The following is a list of all
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