They do, it's the Black Box but it has a major flaw, you can turn it off from the cockpit. The idea for this is due if there was a malfunction within
the system that would activate the system it could be shutdown. Of course it also meant it could be turned off at anytime. I would suspect that this
will change in the near future or a fail safe that kicks in if the cockpit switch is deactivated during flight.
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