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The cockpit voice recorder uses two microphones to capture the sounds of the cockpit for the last 30 minutes of a doomed flight on a tape loop. In the case of the hijacked 9/11 jetliners, the devices should have captured any conversations or actions involving the hijackers, as well as radio transmissions.
The flight data recorder records things like airspeed, heading, and altitude. Both devices - located in the tail of the airplane - emit loud “pings” so they can be located even in ocean jetliner crashes, like the 1996 explosion of TWA Flight 800 off Long Island.
They are built to survive an impact of enormous force - 3400 Gs - and a fire of 1100 degrees Celsius for one hour, somewhat higher than official estimates of the World Trade Center blaze.
“It's extremely rare that we don't get the recorders back. I can't recall another domestic case in which we did not recover the recorders,” Ted Lopatkiewicz, spokesman for the National Transportation Safety Board, told CBS News in 2002. However, officials said little of the jets was recovered.
The question is, if the boxes were found, what's being covered up?
The flight data recorder records things like airspeed, heading, and altitude. Both devices - located in the tail of the airplane - emit loud “pings” so they can be located even in ocean jetliner crashes, like the 1996 explosion of TWA Flight 800 off Long Island.
They are built to survive an impact of enormous force - 3400 Gs - and a fire of 1100 degrees Celsius for one hour, somewhat higher than official estimates of the World Trade Center blaze.
“It's extremely rare that we don't get the recorders back. I can't recall another domestic case in which we did not recover the recorders,” Ted Lopatkiewicz, spokesman for the National Transportation Safety Board, told CBS News in 2002. However, officials said little of the jets was recovered.