So Malaysian Airlines now say that ACARS and the transponder may have been turned off at the same time:
Quote:
But Ahmad Jauhari Yahya, the chief executive of Malaysia Airlines, said at a news conference early Monday evening that the Acars system had worked normally at 1:07 but then failed to send its next regularly scheduled update at 1:37 a.m., and could have been disabled at any point between those two times. “We don’t know when the Acars system was switched off,” he said.
Mr. Ahmad Jauhari said the co-pilot’s verbal signoff was given by radio at 1:19 a.m., and the aircraft’s transponder, which communicates with ground-based radar, ceased working about two minutes later.
The new account appeared to reopen the possibility that the aircraft was operating normally until 1:21 a.m., and that the two communications systems failed or were deactivated at the same time, not at separate points.
Also, they say that it was the co-pilot who spoke the final words "all right, good night".
I don't think the information about the timing makes it any less likely this was piracy. The multiple turns, the satellite link continuing to operate, etc, would still seem to make it impossible this was a fire or anything of that nature.
I think the information that the transponder was turned off two minutes after that last voice message implicates one of the pilots. Everything was apparently OK in the cockpit, and then in the space of two minutes someone fought their way in and turned off the transponder? At a time that just happened to be the ideal time to quietly go missing from ATC screens? Doesn't seem likely.