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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: ALL
The ECB controls the APU BLEED valves. If APU BLEED is selected ON, the bleed valve closes at
25 000 ft when climbing, and reopens at 23 000 ft when descending.
CONTROLS
Applicable to: ALL
The flight crew uses the controls on the APU panel for routine shutdown. For emergency shutdown :
‐ The flight crew can push the APU FIRE handle, or
‐ The ground crew can push the APU SHUT OFF pushbutton on the interphone panel under the
nose fuselage, or the APU EMER SHUT DOWN pushbutton on the refueling/defueling panel.
GROUND OPERATIONS SAFETY DEVICES
Applicable to: ALL
APU FIRE WITH AUTOMATIC SHUTDOWN
The APU may run, without cockpit crew supervision, when the aircraft is on ground. In case of fire
in the APU compartment :
• APU fire warnings operate in the cockpit
• A horn in the nose gear bay sounds
• The “AVAIL” light goes off
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
A330/A340 FLEET DSC-49-10-20 P 3/4
FCOM 19 AUG 10
• The “FAULT“ light in the MASTER SW comes on
• The APU shuts down
• The APU fire extinguisher discharges.
Note: On ground, the No Break Power Transfer (NBPT) function is inhibited, in the following
cases of APU shutdown :
‐ The APU is shut down, by using the APU SHUT OFF switch on the external power
panel (925 VU).
‐ An APU emergency shutdown is triggered, by using the APU EMER SHUT DOWN
switch on the REFUEL/DEFUEL panel (990 VU).
‐ An automatic APU shutdown is triggered by the ECB.
‐ The APU is shut down, by using the APU FIRE pushbutton.
OPERATION UNDER FAILURE CONDITIONS
Applicable to: ALL
APU FAULT WITH AUTOMATIC SHUTDOWN
The following failures cause an automatic shutdown :
1. Overspeed
2. Certain critical ECB internal failures
3. Underspeed
4. Start abort
5. Low oil pressure
6. High oil temperature
7. Load compressor overtemperature
8. Generator high oil temperature
9. DC power interrupt (BAT OFF, when aircraft on batteries only)
10. Overtemperature
11. Certain ECB internal failures
Failure causes 1 and 2 lead to an automatic shutdown (protective shutdown) in all flight phases.
For failures 3 through 11, the automatic shutdown is inhibited to ensure APU availability (inhibited
shutdown in flight phase 2 to 9).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
DESCRIPTION - MAIN COMPONENTS
Intentionally left blank
A330/A340 FLEET DSC-49-10-20 P 4/4
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-49-20 P 1/8
FCOM 19 AUG 10
OVERHEAD PANEL
Applicable to: ALL
(1) MASTER SW pushbutton
This pushbutton controls the electric supply for APU operation, and its protective features. It
also controls the start and shutdown sequences.
ON/R : ‐ The blue ON light comes on.
‐ Electric power goes to the APU system, and the ECB performs a
power-up test.
‐ The APU air-intake flap opens.
‐ The APU fuel isolation valve and APU LP valve open.
‐ Depending on the transfer activities of the trim tank, and on the pressure
in the trim tank line, the FWD APU and AFT APU fuel pumps operate.
‐ If the aircraft has ground power or main generator power, the APU page
appears on the ECAM display.
Off : Manual shutdown sequence.
‐ The ON light of the MASTER pushbutton SW goes off.
‐ The APU keeps running for a cooling period of 105 s at 100 % speed.
‐ Then, after an additional running period of 15 s (for No Break Power
Transfer), the APU shuts down and the AVAIL light goes off.
‐ At N 7 % the air-inlet flap closes.
Note: Switching OFF then ON the MASTER SW resets the ECB.
FAULT lt : This amber light comes on, and a caution appears on the ECAM, when
an automatic APU shutdown occurs (Refer to DSC-49-10-20 GROUND
OPERATIONS SAFETY DEVICES).
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
APU
CONTROLS AND INDICATORS
A330/A340 FLEET DSC-49-20 P 2/8
FCOM 19 AUG 10
(2) START pushbutton
ON : The blue light comes on.
When the flap is completely open, the APU starter is energized.
When N = 7 %, ignition is turned on.
When N = 50 %, the APU starter is de-energized, and ignition is turned off.
　
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