Originally Posted by
DespairingTraveller
Could someone enlighten me? Were logoff or shutdown messages received from some source? I haven't seen reference to such in the disclosed ACARS information, and I didn't think that audio transceivers and SSR transponders did such things.
I'm not aware of any such evidence. The SATCOM logs, for example, didn't show any kind of logoff message from the aircraft, it just stopped transmitting for a while around the time the transponder went off.
To me, that tends to imply a power failure, but that power failure could be due to human actions.