Hi PJ2,
Thank you for your reply.
So, if the power failed after last ACAR, the recorders would shut down also and we would be left with a big blank if the aircraft did not crashed right after that... In some way, it may be only an indication of the power failure if recorded data could be clear enough to assume that aircraft was still in control when recording stopped.
But you did not say exactly what you will do if you were left with a dual engine flameout and a controlable aircraft, assuming the same position, meteo and heading ?
S~
Olivier