Document date 30 May 1973AIDates: machine-written — generated by an AI model from the transcripts, and it can be wrong. The scan is the source; the transcript is machine-generated from it.
FBI 164-81, Vault Part 78 p. 251 (DB Cooper-34123), Report, dated 30 May 1973, serial 276-44-0983 (as read from the transcript) — cooper.theunsolved.net/parts/Cooper-Part-78/pages/251
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.