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This question already has an answer here:

Can an FDR on a Boeing 777 be interfered with or vandalised during flight?

If this has happened on MH370 then the black boxes may not yield any data if found.

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marked as duplicate by ratchet freak, DeltaLima, casey, Lnafziger Mar 24 '14 at 21:38

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • $\begingroup$ you can pull the fuses of the black boxes, this may set off an alarm depending on the craft though $\endgroup$ – ratchet freak Mar 24 '14 at 20:57