The Air Transat mechanics did not cannibalize a fuel pump and fuel duct from an L-1011. Rolls Royce shipped the new engine minus a fuel pump, a fuel duct and a support bracket. In order to get the aircraft back into the air they removed the pump and duct from the original engine. It was generally agreed that they would have no trouble for the short wait period for the new duct and bracket. Obviously they were wrong because without the bracket the duct rubbed against another piece of hardware and eventually developed a massive leak.
Regarding the actions taken by the pilot it was in direct accordance with the checklist provided for a situation where there was a fuel imbalance. In following the procedure when he received a warning about a fuel imbalance it was too late. It is my understanding that on Air Transat’s 757 Boeing provides a warning when there is a difference of about 1700 pounds. Airbus does not provide a warning until the difference is significantly higher than the warning provided on Boeing aircraft.
IMHO it was the maintenance department and Rolls Royce that should share the blame. I also believe that Airbus should accept some responsibility for the design of the engine installation.
