Vol. 1 04--00--1
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Table of Contents
Flight Crew Operating Manual
CSP A--013
MASTER
CHAPTER 4 --AUXILIARY POWER UNIT
Page
TABLE OF CONTENTS 04--00
Table of Contents 04--00--1
INTRODUCTION 04--10
Introduction 04--10--1
POWER PLANT 04--20
APU Power Plant 04--20--1
Engine 04--20--1
Gearbox 04--20--1
SYSTEMS 04--30
Systems 04--30--1
Lubrication 04--30--1
Fuel 04--30--1
Ignition and Starting 04--30--1
Air Intake 04--30--1
CONTROL 04--40
Control 04--40--1
Starting 04--40--1
Stopping 04--40--2
Protective Shutdown 04--40--9
System Circuit Breakers 04--40--10
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 04--10--1 Auxiliary Power Unit Installation 04--10--2
Figure 04--10--2 Auxiliary Power Unit Pneumatic Flow 04--10--3
Figure 04--10--3 Auxiliary Power Unit Indication 04--10--4
SYSTEMS
Figure 04--30--1 Auxiliary Power Unit Controls and ECU Interface 04--30--2
Figure 04--30--2 Auxiliary Power Unit Door Position Chart 04--30--3
CONTROL
Figure 04--40--1 Start/Stop Run Controls 04--40--3
Figure 04--40--2 Fuel Synoptic Page 04--40--4
REV 56, Jan 31/03
Vol. 1 04--00--2
AUXILIARY POWER UNIT
Table of Contents
Flight Crew Operating Manual MASTER
CSP A--013
Figure 04--40--3 APU Door and Run Indication 04--40--5
Figure 04--40--4 APU EICAS Messages -- Primary Page 04--40--6
Figure 04--40--5 APU EICAS Messages -- Status 04--40--7
Figure 04--40--6 APU Start Sequence 04--40--8
Vol. 1 04--10--1
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
1. INTRODUCTION
The auxiliary power unit (APU) is installed within a fireproof titanium enclosure in the aft
equipment compartment. The APU is a fully automated gas turbine power plant which
drives an electrical generator. The generator is rated at 30 kVA and produces 115 VAC
electrical power for backup to the main engine generators (refer to Chapter 7). The APU
also supplies compressed air to the pneumatic system for main engine starting and
environmental control (refer to Chapter 19).
The maximum operating altitude of the APU is 37,000 feet. The maximum altitude for APU
starting is 30,000 feet. The maximum altitude for main engine starting using APU bleed air
is 13,000 feet. ECS operation using APU bleed air is 15,000 feet.
An Electronic Control Unit (ECU), located in the aft equipment compartment, controls the
APU through all phases of operation. The ECU monitors all sensors and switches, sets up
the appropriate fuel acceleration schedules and relays specific operating data to the engine
indication and crew alerting system (EICAS). The ECU is powered through selection of a
PWR/FUEL switchlight on the APU control panel in the flight compartment.
The APU intake door position is continuously shown on the EICAS status page. APU RPM
and exhaust gas temperature (EGT) indications are shown on the EICAS status page, only
when the APU PWR/FUEL switchlight on the APU control panel is selected.
REV 56, Jan 31/03
Vol. 1 04--10--2
AUXILIARY POWER UNIT
Introduction
Flight Crew Operating Manual MASTER
CSP A--013
Auxiliary Power Unit Installation
Figure 04---10---1
APU INTAKE
BLEED AIR
DUCT
APU ENCLOSURE
SERVICE
DOOR
SUPPORT
SKID
CUT--OFF
SWITCH
ECU
COOLING
AIR INLET
ENGINE FIRE
EXTINGUISHER
STARTER
GENERATOR
FUEL
MODULE
LOAD
CONTROL
VALVE
EXHAUST
PIPE
ASSEMBLY
OIL
COOLER
OIL
MODULE
COOLING
AIR
EXHAUST
Vol. 1 04--10--3
REV 56, Jan 31/03
AUXILIARY POWER UNIT
Introduction
Flight Crew Operating Manual
CSP A--013
MASTER
Auxiliary Power Unit Pneumatic Flow
Figure 04---10---2
APU
RIGHT 10TH
STAGE BLEED
SHUTOFF
VALVE
LEFT PACK
SHUTOFF
VALVE
CHECK
VALVE
LEFT 10TH
STAGE BLEED
SHUTOFF
VALVE
CHECK
VALVE
CHECK
VALVE
AIR
TURBINE
STARTER
LEFT
ENGINE ISOLATION
VALVE
RIGHT PACK
SHUTOFF
VALVE
AIR
TURBINE
STARTER
STARTER
CONTROL
VALVE
RIGHT
ENGINE
LOAD
CONTROL
APU VALVE
100 150 200 250 300 350
0
5
10
15
20
25
30
35
40
45
335 Kt
.80 M
.85 M
330 Kt
REV 56, Jan 31/03
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