Part 41, page 30
DB Cooper-11398Serials SE 164-81
Document date 30 May 1973
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FBI 164-81, Vault Part 41 p. 30 (DB Cooper-11398), Report, dated 30 May 1973 — cooper.theunsolved.net/parts/Cooper-Part-41/pages/30
Transcript
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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. [handwritten annotation partially illegible]
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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[illegible handwritten annotation, possibly a date or initials]
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10. DB Cooper-11398