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Description .................................................................................................................. 5-14
Components and Operation........................................................................................ 5-14
Bleed Air Supply.................................................................................................... 5-14
Load Control Valve (LCV) ..................................................................................... 5-14
Surge Control Valve (SCV) ................................................................................... 5-15
Bleed Air Indication ............................................................................................... 5-15
Controls and Indicators ............................................................................................... 5-17
EICAS Messages........................................................................................................ 5-20
List of Figures
Graphic Title Figure
For Training Purposes Only
Sept 04
5-iii
P I LOT T R A I N I N G GU I D E AUXILIARY POWER UNIT
Auxiliary Power Unit (APU) .................................................................................................5-1
APU Schematic (Power Section and Accessory Gearbox).................................................5-2
APU Schematic (Generator Adapter)..................................................................................5-3
APU Schematic (Air Intake and Exhaust) ...........................................................................5-4
APU Schematic (Fuel Distribution, Start and Ignition) ........................................................5-5
APU Schematic (Pneumatic Supply) ..................................................................................5-6
APU System Schematic......................................................................................................5-7
APU Control Panel and EICAS Indications.........................................................................5-8
APU Fault Indication Panel .................................................................................................5-9
EICAS Synoptic and Status Page Color Coding............................................................... 5-10
5-iv For Training Purposes Only
Sept 04
AUXILIARY POWER UNIT P I LOT T R A I N I N G GU I D E
Page Intentionally Left Blank
AUXILIARY POWER UNIT
For Training Purposes Only
Sept 04
5-1
P I LOT T R A I N I N G GU I D E
CHAPTER 5: AUXILIARY POWER UNIT Introduction
A GTCP-36-100E constant-speed gas turbine auxiliary power unit (APU) is installed
in a fire-resistant compartment in the aft equipment bay of the airplane.
The APU drives a generator providing AC electrical power during ground operations,
and serves as a backup AC power source in flight. The APU also provides pressurized
bleed air to the 10th-stage manifold for air conditioning and engine starting.
The maximum operating altitude of the APU is 20,000 feet MSL. In-flight APU
starting is guaranteed below 15,000 feet and has been demonstrated up to 20,000 feet,
from 141 to 290 KIAS. In-flight APU bleed air extraction for air conditioning is not
permitted above 14,500 feet.
APU Enclosure
The APU enclosure is a stainless-steel, fireproof 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 flapper door on the left side of the enclosure provides cooling airflow
while the APU is operating. When the APU is shut down, the flapper door is springloaded
closed.
APU fire detection and fire extinguishing systems are covered in Chapter 9 Fire
Protection.
Auxiliary Power Unit (APU)
Figure 5-1
APU Enclosure
Assembly
Flapper
Door
APU Inlet Duct
Water Drain
10th-Stage
Bleed Air
Ducting (ref)
APU Inlet
Duct Assembly
Service Door
APU Electronic
Control Unit
P604_05_006
APU Enclosure
Access Panel
APU Exhaust
System
AUXILIARY POWER UNIT
5-2 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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.
The APU powerplant consists of the following major components:
• Single-stage centrifugal compressor
　
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