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French Gen. David Galtier holds up a picture of the second black box from downed Germanwings Flight 9525 during a press conference in Marseille, France, on Thursday, April 2. The flight data recorder shows that the co-pilot purposely used the controls to speed up the plane's descent, investigators said.
French Gen. David Galtier holds up a picture of the second black box from downed Germanwings Flight 9525 during a press conference in Marseille, France, on Thursday, April 2. The flight data recorder shows that the co-pilot purposely used the controls to speed up the plane's descent, investigators said.

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    What else could flight data recorder reveal?

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What else could flight data recorder reveal?

Forensic audio expert and Pro Audio Labs president Paul Ginsberg weighs in.

What else could flight data recorder reveal?

Forensic audio expert and Pro Audio Labs president Paul Ginsberg weighs in.