Part 10, page 490
Document date 25 November 1971
FBI 164-81, Vault Part 10 p. 490 (DB Cooper-1726), Report, dated 25 Nov 1971 — cooper.theunsolved.net/parts/Cooper-Part-10/pages/490
Transcript
The scan is the source; the transcript is machine-generated from it.
NWA Chief Performance Engineer had been called to field to help calculate [guess: type], etc. Boeing Company had been contacted for assistance in range problem, flight characteristics with air-stairs extended, shelter opening (stairs extend about 20° in flight, possibly more with man's weight on them) would be large enough for a man to exit. Boeing assured us there would be no controllability problem, that they would get experts work- ing on range problem also, that they had dropped 2-3000 boxes out air-stair opening in flight and that man could probably get out.
NWA Communications people also had arrived at field to assist in required 'phone-patching', other communications problems.
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four supervisory pilots, 1 performance engineer, many others on the scene (MSPFO) for assistance.
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145* Flight at 7000', 160KAS, fuel flow (FF) 4500#/engine, flaps 30° gear DOWN. MSPFO advised they would have even more severely limited range in the flaps 30° position. Crew given prelimin- ary information on optimum range TAS (170K), weather, air- ports available between SEA and RNO, minimum obstruction clearance altitudes, etc.
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MSPFO asked for stewardess best recollection of exact content of HJ briefcase. She got on radio and gave following basic information:
- Eight red sticks, about 5" x 1" in left corner of brief case. "Look like big firecrackers." Two rows of sticks, four on top of four. - Wire attached to dynamite with red insulation. - Battery "like flashlight battery, but about 6" high and as big around as my arm". - Red sticks are about the color "of my uniform".
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2055 Crew called HJ and asked him if everything was O.K. and he replied that it was. This was apparently the last communi- cation the crew had with the HJ.
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2100 Crew reported oscillation of cabin rate of climb indicator. This probably due to HJ weight now on stairs, stairs extending further, resultant effect on cabin pressure. May be best estimate of when he exited airplane.
MSPFO advised crew that range to RNO now looked good (air- plane now at 10,000', 170K, gear DOWN, flaps 15°, FF 4000#/ hour/engine. TAT -7°C. MSPFO calculated TAS and range from this data.
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DB Cooper-1726