American investigates as 777 engine fails to respond to throttle

[ppppilot]

Severe Icing is very usual during winter at Geneve. It has a very high MSA and they are used to make you holding high, close to the Montblanc on intense traffic. Holding at -20º into the rain is severe icing and we used to deploy some spoiler and increase the power since one our pilots declared emergency because of the high vibrations. Vibrations were not only high, were mighty. 11º at surface and just a layer of clouds it is not enough to be guilty and the records don’t appoint that way on the BA38.
Sky9 I have flown a B757 RB211 with the same problem as yours. Changing from IP to HP as the engine reduced to idle, there was a synchronization fault and that produced a stall at the compressor inlet with a strong explosion and a yaw push. The explosion indicates that the flame was out for a while. In such a case, even being a very small stall the recorded parameters must show it.
Same explanation can apply to aerodynamics due to AOA.
Don’t forget that all the records showed normal operation. At least if Boeing has shown all the data in its pocket.¿?