It's not clear when the engine data (ASCARS) stream stopped. It did not continue for 4 hours or whatever, as some media outlets reported. It appears that a few "pings" or fragments were received from the ASCARS system hours later, but no data. The latter is significant, because the ASCARS data includes altitude, velocity and position.
Hey, something I actually know something about. It's
ACARS and my understanding of the system is that it doesn't constantly transmit data anyway. We get ACARS data before and after takeoff, when the aircraft reaches it's highest altitude and just before and after landing. Now I don't know if all ACARS works that way, but that's how it works at Southwest. So when they say they got a few "pings" it probably means that the system was active but not sending data. Also my understanding is that ACARS would not really be of that much help to them. It's mostly used by SWA to estimate fuel consumption, determine maintenance schedules and stuff like that. Now I believe that ACARS can do a lot more then that, but I somehow kinda suspect that Malyasia doesn't use all the fancy stuff that ACARS can do especially since Southwest doesn't. Just my opinion, I could be wrong.
Now for some pure conspiracy conjecture on my part, seeing as how we get data before and after landing and they said they got some "pings", could it be that the aircraft landed?