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�� LEAK FROM ENGINE/PYLON NOT CONFIRMED or LEAK NOT LOCATED:
Stop any fuel transfer, and then monitor the depletion rate of each inner tank, to determine if
the leak is from an engine or a wing (Case 1), or from the Trim tank, or the APU/Trim feeding
line (Case 2).
FUEL X FEED...........................................................................................MAINTAIN CLOSED
The crossfeed valve must remain closed to prevent the leak from affecting both sides.
T TANK FEED................................................................................................................... ISOL
INNER TANKS FUEL QUANTITIES.........................................................................MONITOR
Monitor the depletion rate of each inner tank.
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
FUEL
A330/A340 FLEET PRO-ABN-28 P 90/98
FCOM 19 AUG 10
FUEL LEAK (Cont'd)
�� CASE 1: IF ONE INNER TANK DEPLETES FASTER THAN THE OTHER BY AT
LEAST 500 kg (1 100 lb) IN LESS THAN 30 min:
An engine leak may still be suspected. Therefore:
THR LEVER (engine on leaking side)........................................................................ IDLE
ENG MASTER (engine on leaking side)......................................................................OFF
FUEL LEAK........................................................................................................ MONITOR
�� If leak stops:
If the inner tank fuel quantity of the affected side stops decreasing, the engine leak is
confirmed and stopped.
T TANK FEED.................................................................................................... AUTO
FUEL X FEED..................................................................................... USE AS RQRD
The crossfeed valve can now be opened to re-balance fuel quantity, or to enable use
of fuel from both wings. Do not restart the engine.
�� If leak continues (after engine shutdown):
If the inner tank fuel quantity of the affected side continues to decrease, a leak from
the wing may be suspected.
ENGINE RESTART....................................................................................CONSIDER
FUEL LOSS REDUCTION proc.................................................................CONSIDER
Refer to PRO-ABN-28 FUEL LOSS REDUCTION.
CAUTION Do not apply the FUEL IMBALANCE procedure. Approach and
landing can be done, even with one full wing/one empty wing.
�� CASE 2: IF BOTH INNER TANKS DEPLETE AT A SIMILAR RATE:
A leak from the Trim tank, or the APU/Trim feeding line may be suspected.
�� If fuel smell in the cabin:
APU (if ON.............................................................................................................OFF
T TANK FEED....................................................................................MAINTAIN ISOL
This prevents additional fuel loss through the APU/Trim feeding line.
�� If no fuel smell in the cabin:
A leak from the Trim tank may be suspected.
FUEL LOSS REDUCTION proc.................................................................CONSIDER
Refer to PRO-ABN-28 FUEL LOSS REDUCTION.
To be continued on next page
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
FUEL
A330/A340 FLEET PRO-ABN-28 P 91/98
FCOM 19 AUG 10
FUEL LEAK (Cont'd)
FOR LANDING
CAUTION Do not use reversers.
A330/A340 FLIGHT CREW
OPERATING MANUAL
PROCEDURES
ABNORMAL AND EMERGENCY PROCEDURES
FUEL
A330/A340 FLEET PRO-ABN-28 P 92/98
FCOM 19 AUG 10
FUEL LEAK
Applicable to: ,
A fuel leak may be detected by:
The sum of FOB and FU is significantly less than FOB at engine ‐ start, or is decreasing, or
‐ A passenger observes a fuel spray from an engine/pylon, or a wing tip, or
‐ The total fuel quantity is decreasing at an abnormal rate, or
‐ A fuel imbalance is developing, or
‐ Fuel quantity of a tank is decreasing too fast (leak from engine/pylon, or hole in a tank), or
‐ A tank is overflowing (due to pipe rupture in a tank), or
‐ The Fuel Flow is excessive (leak from engine), or
‐ Fuel is smelt in the cabin.
If visibility permits, leak source may be identified by a visual check from the cabin.
WHEN A LEAK IS CONFIRMED
LAND ASAP
�� LEAK FROM ENGINE/PYLON CONFIRMED:
Engine fuel leak can be confirmed by excessive fuel flow indication, or a visual check.
THR LEVER (of affected engine)...................................................................................... IDLE
ENG MASTER (of affected engine)....................................................................................OFF
　
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