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In the Inmarsat data of MH370, there are handshakes (BTO) with time (UTC) at: 19:41, 20:41, 21:41, 22:41, 00:11,00:19. Normally it pinged every hour, but why the 2nd to last happened at 00.11 that was 1.5 hour after the previous one? The last one happened at 00:19 is for what reason?

Also can ping be stopped manually, e.g. by turning off the power, then there will be no ping?

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This was explained back in 2014 when the data was released. It is consistent with a loss of power due to fuel exhaustion, followed by battery power restoring communication.

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    $\begingroup$ And the lack of signal after 00:19 indicates that the batteries were also dead by that time. $\endgroup$
    – jwenting
    May 27, 2019 at 9:33

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