Originally Posted by
snanceki
Need to correct you. The DIFFERENCE between LH and RH installation was only 1 sec.
Roll back occurred after 7 or 8 secs.
Sorry if 7/89 looked like a fraction.
Hate to correct a correction, but according to the AAIB the
difference was around 7 seconds, not only 1 sec:
of about 720 ft the thrust of the right engine reduced to approximately 1.03 EPR (engine pressure ratio); some seven seconds later the thrust on the left engine reduced
in addition to any asymmetry in the fuel feed geometry (possibility mentioned recently), there are other asymmetries which might possibly be relevant when looking at this difference.
eg. Fuel levels were not identical in each wing (300kg difference I recall), and also one wing would have been in sun and the other in shade, therefore likely to be some temparature difference.