Part 41, page 54
DB Cooper-11422Serials SE 164-81
Document date 30 May 1973
FBI 164-81, Vault Part 41 p. 54 (DB Cooper-11422), Report, dated 30 May 1973 — cooper.theunsolved.net/parts/Cooper-Part-41/pages/54
Transcript
The scan is the source; the transcript is machine-generated from it.
SE 164-81
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test could have been the hijacker and to determine any in- formation they might have possessed as to the identity of Unsub, all with negative rsults.
On July 31, 1972, [REDACTED] a Boeing Company [REDACTED] made available a copy of the Boeing Test Summary Report pertaining to the flight confi- guration of the 727. The following flight configuration was used during the Boeing air stairs test:
Speed - 125 knots Flaps - 25° down Altitude - 10,000 feet.
In Seattle report of SA CHARLES E. FARRELL, February 16, 1972, it is noted that Unsub requested the following flight configuation prior to taking off from Seattle-Tacoma Airport:
Gear down
Flaps - 15° down Altitude - 10,000 feet
Aft door open and the air stairs down.
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When it was explained to the hijacker that the plane could not take off with the air stairs down, he re- portedly said in a low voice, "Yes they can, but the cockpit can put it down after they get airborne."
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On July 26, 1972, [REDACTED] advised that if the hi- jacker was a member of, or had consulted with a member of the Boeing Test Team, he would have known that the 727 could not have taken off with the air stairs down, nor would it have be been necessary since the air stairs can easily be lowered in flight.
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Stewardess [REDACTED] remarked upon being inter- viewed shortly after the hijacking, that the air stairs and the controls for the air stairs were the only functions of the aircraft that the hijacker did not seem to be fully aware of.
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34.
DB Cooper-11422