What was required in the case of this failure was a precautionary engine shut-down, closing off the fuel supply to the engine totally, and a descent/deceleration to subsonic speed, carefully monitoring fuel consumption all the time. Unfortunately the crew 'forgot' to shut down the fuel LP valve, and this resulted in the fuel continuing to gush out of the failed pipe at an alarming rate. (Oh, and also they forgot to monitor the fuel consumption). Only after the crew FINALLY noticed that they were still losing fuel did they remember to close the engine LP valve, but it was almost too
I have to admit I had to look up my old manuals to ensure I was correct , and I can now confirm that in Concorde's
Precautionary Engine Shut Down Checklist there is no item requiring the crew to shut the LP fuel cock, so they did not forget they stuck to the checklist
Now I do not know what event happened to require the engine to be shut down, and if it was for fuel loss then yes the crew should have been moitoring the difference between fuel on board and fuel used figures and I am sure they were. However if they were also slowing and descending then the fuel system would be quite active and the difference between fuel on board and intergrated fuel left could vary very much during this phase of flight as the fuel cooled and you found that the gauges were still showing a few hundred Kgs each, even though the pump low pressure lights were on
It would not have been until they had settled down at Mach 0.95 with fuel transfer still that a proper appraisal could be made of the difference between the two fuel remaining indication and now the loss of fuel in the appropriate collector tank.
Not sure where they were when they started their subsonic diversion but believe me even with everything going for you there would not have been huge amounts of fuel left, by the time the aircraft got to Halifax
Perhaps if there is any blame it should lie with the people who wrote the checklist, by not putting an item in to cover such a case as this
It seems to me thet poor old Air France are blamed when
1] They deviate from the checklist as was suggested in the crash
OR
2] Stick to the checklist as in this case
Now you might say what about airmanship, well they did use it, perhaps a bit earlier would have been better, but easy to say without knowing all the facts.