Originally Posted by Maninthebar
Possible failures that could account for this include fuel contamination
...which has a tendency to strike soon after takeoff, once the non-contaminated fuel has been burned up and the off-specification, water-containing or otherwise unsuitable stuff reaches the engines. Also, it would be usual in many airlines to fuel the aircraft for the round trip to a remote (-r) airport at the home base, so typically, there is a quite substantial top-up involved. If there had been something wrong, it would be noticed much earlier in flight and in all probability would have affected other flights that used the same fuel source as well.
Originally Posted by Maninthebar
, fuel system failure ...
...hitting both separate fuel systems at once? For the effects of fuel depletion in an airliner, look at Avianca at Cove Neck 1990 or Lamia more recently; this does not kill all engines at the same second.
Originally Posted by Maninthebar
throttle/power control system breakage or failure.
On both engines at the same time, involving both power levers and both condition levers, i. e. 4 levers and their associated linkage and control units at once?
All those assumptions seem extremely far fetched.