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external pneumatic and electrical power supplies.
On the ground
It supplies bleed air for starting the engines and for ‐ the air conditioning system.
It supplies ‐ electrical power to the electrical system.
During takeoff
‐ 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 aircraft's batteries or normal electrical system, or
from ground service.
APU starting is permitted throughout the normal flight envelope Refer to LIM-49-20 ENVELOPE
The ECAM displays APU parameters.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - GENERAL
A318/A319/A320/A321 FLEET DSC-49-10-10 P 2/4
FCOM 19 AUG 10
GENERAL
Applicable to:
,
,
MSN,,,,
The Auxiliary Power Unit (APU) is a self-contained unit that makes the aircraft independent of
external pneumatic and electrical power supplies.
On the ground
‐ It supplies bleed air for starting the engines and for the air conditioning system.
‐ It supplies electrical power to the electrical system.
During takeoff
‐ 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 aircraft's batteries alone or in combination with the
external power, or from ground service.
APU starting is permitted throughout the normal flight envelope.
The ECAM displays APU parameters.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - GENERAL
A318/A319/A320/A321 FLEET DSC-49-10-10 P 3/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - GENERAL
Intentionally left blank
A318/A319/A320/A321 FLEET DSC-49-10-10 P 4/4
FCOM 19 AUG 10
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-49-10-20 P 1/4
FCOM 19 AUG 10
APU ENGINE
Applicable to: ALL
The basic element of the APU is a single-shaft gas turbine that delivers mechanical shaft power for
driving the accessory gearbox (electrical generator, starter, etc.) and produces bleed air (engine
starting and pneumatic supply).
ELECTRONIC CONTROL BOX
Applicable to: ALL
The Electronic Control Box (ECB) is a full-authority digital electronic controller that performs the bulk
of the APU system logic for all modes of engine operation, such as :
Sequences ‐ the start and monitors it.
‐ Monitors speed and temperature.
‐ Monitors bleed air.
‐ Sequences the shutdown.
‐ Controls the automatic shutdown.
AIR INTAKE SYSTEM
Applicable to: ALL
The air intake and an electrically operated flap allow 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 the
MASTER SW and the START pushbutton are ON.
FUEL SYSTEM
Applicable to: ALL
The left fuel feed line supplies the APU.
The required pressure is normally available from tank pumps.
If pressure is not available (batteries only or pumps off) the APU FUEL PUMP starts automatically.
The ECB controls the fuel flow.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
A318/A319/A320/A321 FLEET DSC-49-10-20 P 2/4
FCOM 19 AUG 10
OIL SYSTEM
Applicable to: ALL
The APU has an integral independent lubrication system (for lubrication and cooling).
INLET GUIDE VANES (IGV)
Applicable to: ALL
The IGVs control bleed air flow, and a fuel-pressure-powered actuator positions the IGVs.
The ECB controls the actuator in response to aircraft demand.
AIR BLEED SYSTEM
Applicable to:
The air bleed system is fully automatic.
The ECB sets APU speed to meet the demands on the air bleed system and in view of the ground
and flight configuration.
BLEED DEMAND - GROUND/FLIGHT N %
NIL 99
GROUND MAIN ENG START 101
AIR COND (1) 99/101
FLIGHT 101
　
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