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 05−00−1
Oct 05/06
CHAPTER 5 - AUXILIARY POWER UNIT
05−00−1
CL−605 Flight Crew Operating Manual
PSP 605−6
TABLE OF CONTENTS
Page
TABLE OF CONTENTS
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
Table of Contents
Vol. 2 05−00−2
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
Page
GENERAL
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.
The maximum operating altitude of the APU is 20,000 feet MSL. In-flight APU starting is guaranteed
up to 20,000 feet, from 141 to 290 KIAS.
APU Enclosure
The APU enclosure is a stainless-steel, fire-resistant 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 closed flapper door is
located on the left side of the enclosure, and opens to provide cooling airflow while the APU is
operating.
Refer to Chapter 9, Fire Protection, for information on the APU fire detection/extinguishing
systems.
Auxiliary Power Unit (APU)
Figure 05−10−1
AUXILIARY POWER UNIT
Description
Vol. 2 05−10−1
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
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 groups:
• Compressor
• Combustor
• Turbine
• Accessory gearbox
• Exhaust
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 turbine. The rotating shaft of the turbine rotor drives the compressor and the drive shaft
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