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AUXILIARY POWER UNIT Table of Contents Vol. 2 05.00.1
Oct 05/06
CHAPTER 5 - AUXILIARY POWER UNIT
TABLE OF CONTENTS
Page
TABLE OF CONTENTS 05.00.1
DESCRIPTION
General 05.10.1
APU Enclosure 05.10.1
Power Section and Accessory Gearbox 05.10.2
Description 05.10.2
Components and Operation 05.10.2
Generator Adapter 05.10.3
Description 05.10.3
Components and Operation 05.10.4
Air Intake and Exhaust 05.10.6
Description 05.10.6
Components and Operation 05.10.6
APU Fuel Distribution 05.10.8
Description 05.10.8
Components and Operation 05.10.8
Start and Ignition 05.10.12
Description 05.10.12
Components and Operation 05.10.12
Pneumatic Supply 05.10.20
Description 05.10.20
Components and Operation 05.10.20
Controls and Indicators 05.10.21
EICAS Messages 05.10.24
SUMMARY
Power Supply and Circuit Breaker Summary 05.20.1
LIST OF ILLUSTRATIONS
DESCRIPTION
Figure 05.10.1 Auxiliary Power Unit (APU) 05.10.1
Figure 05.10.2 APU Power Section and Accessory Gearbox 05.10.3
Figure 05.10.3 APU Generator Adapter 05.10.5
Figure 05.10.4 Air Intake, Exhaust and Indication 05.10.7
AUXILIARY POWER UNIT Table of Contents Vol. 2 05.00.2
Oct 05/06
Page
LIST OF ILLUSTRATIONS
DESCRIPTION
Figure 05.10.5 APU Fuel Pump and Shutoff Valve 05.10.9
Figure 05.10.6 Negative.G Shutoff Valve and FCU 05.10.11
Figure 05.10.7 APU Start and Ignition 05.10.13
Figure 05.10.8 APU Start 05.10.15
Figure 05.10.9 APU Normal Shutdown 05.10.17
Figure 05.10.10 APU Protective/Emergency Shutdowns and Faults 05.10.19
Figure 05.10.11 APU Pneumatic Supply 05.10.21
Figure 05.10.12 APU Panel and EICAS Indications 05.10.22
Figure 05.10.13 EICAS and Synoptic Page Color Coding 05.10.23
AUXILIARY POWER UNIT Description Vol. 2 05.10.1
Oct 05/06
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.
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