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Air Intake and Exhaust 04--30--1
CONTROL 04--40
Controls 04--40--1
Starting 04--40--1
Stopping 04--40--1
Protective Shutdown 04--40--6
System Circuit Breakers 04--40--7
LIST OF ILLUSTRATIONS
INTRODUCTION
Figure 04--10--1 Auxiliary Power Unit -- Introduction 04--10--2
Figure 04--10--2 APU Altitude and Airspeed Envelope 04--10--3
Figure 04--10--3 Pneumatic Flow 04--10--4
Figure 04--10--4 APU Start and Operating Limits 04--10--5
Figure 04--10--5 APU Door Position 04--10--6
Figure 04--10--6 EGT Shutdown Schedule 04--10--7
SYSTEMS
Figure 04--30--1 APU Controls and ECU Interface 04--30--2
Vol. 1 04--00--2
AUXILIARY POWER UNIT
Table of Contents REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
CONTROL
Figure 04--40--1 Auxiliary Power Unit -- Control 04--40--2
Figure 04--40--2 EICAS Auxiliary Power Unit Indications -- Primary 04--40--3
Figure 04--40--3 Auxiliary Power Unit and Indications -- Status 04--40--4
Figure 04--40--4 APU Start Sequence 04--40--5
Vol. 1 04--10--1
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
1. INTRODUCTION
The auxiliary power unit (APU) is a gas turbine power plant which drives an electrical
generator. The generator is rated at 40 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). To prevent compressor surge, some compressor air is vented
overboard by a surge control valve.
The APU is enclosed within a fireproof tailcone assembly. The APU compartment is
composed of an upper section and forward and aft bulkheads made of titanium. Two
clamshell doors made of fireproof composite material enclose the sides and bottom of the
compartment.
An Electronic Control Unit (ECU), located in the aft equipment bay, 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. The APU
RPM and exhaust gas temperature (EGT) are shown on the EICAS status page, only when
the APU PWR/FUEL switchlight on the APU control panel is selected.
Vol. 1 04--10--2
AUXILIARY POWER UNIT
Introduction Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
Auxiliary Power Unit --- Introduction
Figure 04---10---1
AIR INLET
EXHAUST
IGNITION
UNIT
OIL COOLER
GENERATOR
STARTER
PNEUMATIC
DUCT
SURGE CONTROL
VALVE
Vol. 1 04--10--3
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU Altitude and Airspeed Envelope
Figure 04---10---2
Vol. 1 04--10--4
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
Pneumatic Flow
Figure 04---10---3
STARTER
AIR VALVE
HIGH
PRESSURE
PORT
APU
HIGH
PRESSURE
VALVE
HIGH
PRESSURE
PORT
AIR
TURBINE
STARTER
AIR COND
WING
A/I VALVE
WING
ANTI--ICE
LOW
PRESSURE
PORT
AIR
TURBINE
STARTER
BLEED SOURCE
BOTH ENG
L
ENG
APU
(AUTOMATIC OR
MANUAL)
COWL ANTI--ICE
LEFT ENGINE
R
ENG
RIGHT ENGINE
COWL ANTI--ICE
LOW
PRESSURE
PORT
WING
ANTI--ICE
WING
A/I VALVE
BLEED AIR COND
ISOLATION
VALVE
PRSOV PRSOV
GENERATOR
GROUND
AIR SUPPLY
LOAD CONTROL
VALVE (LCV)
STARTER
AIR VALVE
HIGH
PRESSURE
VALVE
ON OFF
GENERATOR OUTPUT
TO BUS DISTRIBUTION
GENERATOR
CONTROL UNIT
(GCU)
RPM
EGT
APU GEN
SELECTOR
APU GEN
APU
ELECTRONIC
CONTROL UNIT
(ECU)
OFF/
RESET
AUTO
EP
Vol. 1 04--10--5
AUXILIARY POWER UNIT
Introduction REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
APU Start and Operating Limits
Figure 04---10---4
--5,000
--100 --80 --60 --40 --20 0 20 40 60
0
5,000
10,000
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