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Background Attack Aftermath Evidence Misinformation Analysis Memorial

Flight Data Recorders

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 and, like the cockpit voice recorders, are recovered after crashes in order to reconstruct events.

To date, none of the contents of any of the FDRs from the two jetliners that hit the Twin Towers have been made public.

Flight Data Recorder
Time recorded 25 hour continuous
Number of parameters 18 - 1000+
Impact tolerance 3400Gs / 6.5 ms
Fire resistance 1100 degC / 30 min
Water pressure resistance submerged 20,000 ft
Underwater locator beacon 37.5 KHz; battery has shelf life of 6 years or more, with 30-day operation capability upon activation
1  

References

1. Cockpit Voice Recorders (CVR) and Flight Data Recorders (FDR), NTSB.gov,

page last modified: 2009-03-14