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this post was submitted on 08 Jan 2024
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I am a little surprised there isn't a catastrophic "save last 5 minutes" type thing like with a dashcam. I guess in many cases that last 5 minutes would have been saved by the fact that it crashed, but the issue was overlooked for planes that suffer a major event and stay in the air.
In this case, I seriously doubt the pilots' conversation is going to add much to the investigation. It seems pretty obvious what happened and outside the pilots' control.
My cheap dashcam does rolling saves if days worth of HD video... but aviation safety can only manage 2 hours of audio? Weeks worth of buffer should be trivial to add from both an economic and operational standpoint, and would have solved this issue (though not the door, obviously).
The logs should be getting pushed to a meaningful amount of local storage, and radio chatter saved centrally (there's almost certainly amateurs stockpiling these recordings - large institutions are definitely capable).
Better yet, upload the info regularly. Remember MH370, where we only know roughly what happened because it occasionally checked in with satellites? So the capability exists.
As far as I know, there's telemetry from the whole plain, not only the voice recording, so there might have been something useful ¯\_(ツ)_/¯
Edit: but just after responding I found out that the rest of the data is intact, so I was wrong
Yeah, I might have been unclear, I knew that other telemetry was available and it was just the voice recordings that were wiped due to the time they operated after the incident.
Telemetry is going to be numerical data that likely compresses very well, so even with a large amount of sensors I can't imagine it taking that much.
And yeah, voice users significantly less than video, where modern cheap dash cams can record days on a small SD card. Methinks flight recorders can do better. At the least they should be viable for the max flight time of the aircraft.