In past accidents the reasons it stops recording is:
1) loss of electrical power which is generated by the engines
2) disconnection of the wires that lead to the recorder.
So damage to the fuselage or to the power system are prime suspects.
Just wondering …..Did they send it to FBI for analysis????
Seemed to me the ac was at dang near full power skidding down the runway right up to the impact with the structure.
Box has its own power source.
Only if the breakers were pulled.