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Originally Posted by Kevin J
I'm just catching the tail end of this thread and have always thought it was pilot suicide or something to that effect. Don't quite understand why he'd be so careful to avoid radar though. If you're bent on killing yourself and don't care if you take others with you just crash the plane anywhere. Why go through all the trouble of avoiding radar?
There are also other very rare events that might've taken place. Could it have been a sudden loss in cabin pressure and maybe he passed out with his hand on a knob or control that veered the plane into slow descent turn?
We can speculate all we want, but only finding the plane and black box are likely to turn up meaningful answers imo.
The plane made not one but several turns after the transponder and ACARS were disabled and it left its route. It was tracked by Malaysian military radar:
We know from the Inmarsat data that after radar lost it, it must have taken a further turn south, to head down into the southern Indian Ocean. Radar lost it almost an hour after the transponder was disabled and it made its first deviation from its set route. So the facts aren't consistent with sudden hypoxia, or with anything sudden.
Clearly the pilot didn't want to be found. Why that is is speculation, as with all else concerning his motive, but there's plenty of precedent for that, including a prior pilot suicide case where he attempted to conceal what had happened (SilkAir 185).
Unfortunately the black box may not work after years on the ocean floor. At least we can be pretty sure it wasn't disabled. On the 777, the controls to do that are only accessible through a floor panel at the aft of the cabin. There are far fetched scenarios where the pilot could suffocate everyone then go back and disable it, but it seems unlikely he'd bother considering he expected the plane to never be found - and would have been correct if it weren't for the Inmarsat pings.