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GROUND OPERATIONS SAFETY DEVICES......................................................................................................2/4
OPERATION UNDER FAILURE CONDITIONS................................................................................................... 3/4
DSC-49-20 CONTROLS AND INDICATORS
OVERHEAD PANEL........................................................................................................................................... 1/8
EXTERNAL CONTROLS.................................................................................................................................... 3/8
ECAM APU PAGE.............................................................................................................................................. 5/8
DSC-49-30 WARNINGS AND CAUTIONS
WARNINGS AND CAUTIONS............................................................................................................................ 1/2
DSC-49-40 ELECTRICAL SUPPLY
BUS EQUIPMENT LIST......................................................................................................................................1/2
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
PRELIMINARY PAGES - TABLE OF CONTENTS
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FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - GENERAL
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FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The Auxiliary Power Unit (APU) is a self contained unit which makes the aircraft independent of
external pneumatic and electrical power supply.
On ground
It supplies bleed air for starting the engine and ‐ for the air conditioning system.
‐ It supplies electrical power to the electrical system.
During Take-Off
‐ It supplies bleed air for air conditioning, thus avoiding a reduction in engine thrust caused by the
use of engine bleed air for this purpose, when optimum aircraft performance is required.
In Flight
• It backs up the Electrical system
• It backs up the Air conditioning
• It can be used to start the engines
The APU may obtain power for starting from the aicraft batteries, or in combination with the external
power, or from ground service, or from normal aircraft supply.
APU start is permitted throughout the normal flight envelope, except when APU battery only is
supplying (Refer to LIM-49 ENVELOPE).
The ECAM displays APU parameters.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - GENERAL
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A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
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FCOM 19 AUG 10
APU ENGINE
Applicable to: ALL
The basic element of the APU is a single shaft gas turbine which delivers mechanical shaft power
for driving the accessory gearbox (electrical generator) and produces bleed air (engine starting and
pneumatic supply).
ELECTRONIC CONTROL BOX
Applicable to:
The Electronic Control Box (ECB) is primarily a full authority digital electronic controller that performs
the APU system logic for all modes of APU operation such as :
‐ Sequence the start and monitors it
‐ Monitors speed and temperature
‐ Monitors bleed air (IGV)
‐ Sequence the shut down (manual or automatic)
ELECTRONIC CONTROL BOX
Applicable to: ,
The Electronic Control Box (ECB) is primarily a full authority digital electronic controller that performs
the APU system logic for all modes of APU operation such as :
‐ Sequence the start and monitors it
‐ Monitors speed and temperature
‐ Monitors bleed air (IGV)
‐ Sequence the shut down (manual, protective or inhibited)
AIR INTAKE SYSTEM
Applicable to: ALL
The air intake and an electrically operated flap allow the external air to reach the compressor inlet.
STARTER
Applicable to: ALL
The ECB controls the electric starter. The starter engages if the air intake is fully open and provided
the MASTER SW and the START pushbutton are ON.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
A330/A340 FLEET DSC-49-10-20 P 2/4
FCOM 19 AUG 10
FUEL SYSTEM
Applicable to: ALL
The APU is supplied from the trim tank transfer line (Refer to DSC-28-10-100 FWD APU PUMP
FEED).
The ECB controls the fuel flow.
OIL SYSTEM
Applicable to: ALL
The APU has an integral independent lubrication system (for lubrication and cooling).
　
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