SirLoinThatSaysNi t1_itu4z4q wrote
Reply to comment by StuartBaker159 in TIL that flight recorders must be able to withstand an acceleration of 3400 g for 6.5 milliseconds and that this is roughly equivalent to an impact velocity of 270 knots (310 mph; 500 km/h). by IchBinKoloss
I suspect it's because they are inside the aircraft so have several layers of crumple zone around them. It is not, generally anyway, just the exposed box hitting an immovable object.
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