Originally Posted by
philipat
[I]
The Black boxes, if ever found, might not really help explain. The CVR is only good for 2 hours and whilst the DVDR might eliminate technical difficulties, can it really show what actually happened? It seems clearer by the day that SOMEONE didn't want the aircraft's flight path to be recorded or any "Evidence" found afterwards and deliberately chose the South IO to "Loose" all trace?
The question as to who is that SOMEONE or SOMEONES may never be answered?
The DVDR will show all the recordings for the entire flight so will be able to show failures, or control inputs and will indisputably show whether the aircraft was deliberately flown to its current position and how that was done particularly was it ditched manually or did it just run out of fuel and crash.
The CVR will give the last 2 hours of sound recordings which as with the Egypt air recordings, could show that someone was in the cockpit to the end and potentially who.
But you are right that the period of the turn off the flight plan at handover which would give the most evidence on what actually happened will have been overwritten in the CVR due to the imposed limit of 2 hours.