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May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6
05-01-03 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.
Volume 2 Flight Crew Operating Manual Sep 13/2004 CSP 100-6 REV 1
05-01-04 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.
Sep 13/2004 Flight Crew Operating Manual Volume 2 REV 1 CSP 100-6
05-01-05 FUEL DISTRIBUTION
DESCRIPTION
The Honeywell 36-150BD APU fuel system is a full-authority digital electronic engine (FADEC) controlled system. Dur-ing 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.
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