FUEL LEAK
Applicable to: ALL
Significant fuel leaks although rare, are sometimes difficult to detect. Fuel check will be carried out by
Checking that the remaining fuel added to the burnt fuel corresponds to the fuel on board at the gate.
? Maintaining the fuel log and comparing fuel on board to expected flight plan fuel would alert the crew to any discrepancy.
Fuel checks should be carried out when sequencing a waypoint and at least every 30 min. Any discrepancy should alert the crew and investigation should be carried out without delay. Should an engine failure occur, the ECAM requires the opening of the fuel X feed to avoid fuel
imbalance. In case of supposed or obvious engine damages, the opening of the fuel X feed will be performed only after being certain that there is no fuel leak.
Any time an unexpected fuel quantity indication, ECAM fuel message or imbalance is noted, a fuel leak should be considered as a possible cause. Initial indications should be carefully cross-checked by reference to other means, including if possible, a visual inspection.
If a leak is suspected, the crew should action the "FUEL LEAK" abnormal checklist available in QRH:
? If the leak is positively identified as coming from the engine, the affected engine is shut down to isolate the fuel leak and fuel cross-feed valve may be used as required.
? If the leak is not from the engine or cannot be located, it is imperative that the cross-feed valve is not opened.
 

  ABNORMAL OPERATIONS
FUEL
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

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  ABNORMAL OPERATIONS
HYDRAULIC
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL 

HYDRAULIC GENERATION PARTICULARITIES
Applicable to: ALL
PREFACE
The aircraft has three continuously operating hydraulic systems: green, blue and yellow. A bidirectional Power Transfer Unit (PTU) enables the yellow system to pressurize the green system and vice versa. Hydraulic fluid cannot be transferred from one system to another.
PTU PRINCIPLE
In flight, the PTU operates automatically if differential pressure between green and yellow systems
exceeds 500 PSI. This allows to cover the loss of one engine or one engine driven pump cases.
USE OF PTU IN CASE OF FAILURE
In case of reservoir low level, reservoir overheat, reservoir low air pressure, the PTU must be switched OFF as required by ECAM to avoid a PTU overheat which may occur two minutes later. Indeed, a PTU overheat may lead to the loss of the second hydraulic circuit.
RECOMMENDATIONS
When required by the ECAM, the PTU should switched off without significant delay in case of:
? HYD G(Y) RSVR LO LVL
? HYD G(Y) RSVR LO PR
? HYD G(Y) RSVR OVHT
However, if PTU has been switched off because of HYD G(Y) RSVR OVHT and the alert disappears, affected pump may be restored and PTU switched back to AUTO.
　
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