Part 76, page 82
DB Cooper-33051Serials SE 164-81
Document date 30 May 1973
FBI 164-81, Vault Part 76 p. 82 (DB Cooper-33051), Report, dated 30 May 1973 — cooper.theunsolved.net/parts/Cooper-Part-76/pages/82
Transcript
The scan is the source; the transcript is machine-generated from it.
SE 164-81
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It is apparent from the following excerpts, taken from logs maintained by ground personnel on November 24, 1971, that the hijacker exited the airplane at 8:11 p.m. local time.
When the hijacker jumped, the air stairs were forced closed causing an increase in air pressure similar to shutting a car door with the windows up. As this pressure increase occurred the co-pilot turned to look at the cabin rate of climb meter and in doing so his communications ear plug was pulled from his ear.
The co-pilot's comments at this time were being recorded on a tape recorder which had previously been started on a time standard signal. Through careful play back and sequencing, the time of the pressure oscillation caused by the air stairs closing after Unsub departed was determined to be 8:11 p.m. local time.
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DB Cooper-33051