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Politics : GOPwinger Lies/Distortions/Omissions/Perversions of Truth
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To: Raymond Duray who wrote (7159)3/22/2004 3:14:28 PM
From: Karen Lawrence  Read Replies (1) of 173976
 
More:
Missing Evidence About the September 11th Flights
Flight data recorders (FDRs) record the readings of instruments and positions of the aircraft's control surfaces over time. They are contained in "black boxes" that are designed to survive the worst crashes. The same black boxes also contain the cockpit voice recorders. To date, none of the contents of any of the black boxes have been released to the public, authorities having claimed that all but the recorders on Flight 93 were either not recovered or too damaged to yield data. The black box of Flight 77 was allegedly found on September 14th, but yielded "nothing useful" according to FBI director Robert Mueller. 1 2

Survivability Requirements
Events that would damage the recorders sufficiently to make them unreadable are extremely rare. The recorders are designed to survive the kinds of impacts that happened at the World Trade Center and the Pentagon.

The FAA has placed durability requirements on the recorders and their casings to survive severe impact and fire

The storage medium of each recorder is located in a protective capsule, which must be able to withstand an impact of 3,400 Gs (3,400 times the force of gravity). Additionally, each must also survive flames at 2,000 F for up to 30 minutes, and submersion in 20,000 feet of saltwater for 30 days. Typically, to increase their chances of survival, the recorders are located in the tail section of the aircraft, which usually sustains the least impact in a crash.
911research.wtc7.net
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