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' Orr: MAY $962 EDITION ‘ 6S4 FeMR (4 CPR) 103-18.6 UNITED STATES GOVERNMENT ~ Memorandum TO > SAC (164-81) (P) DATE: 12/8/71 4s FROM :saLSidY | Sue - P. — 7 - OC supjecT: UNSUB, aka } Dan Cooper; . - GC. NORTHWEST AIRLINES FLIGHT 305 - PORTLAND TO SEATTLE, 11/24/71 RE: Boeing Technical CAA~HIJACKING; Data. b3 . EXTORTION 00: SE ’ b6 oliowing information: | b6 testing of this prey aircraft, It is physically impossible to make a take-off in the 727 with the rear stairs extended. He explained that i if this were attempted the stairs would strike the runway [ at the point of rotation just prior to liftoff. JCN/djs (3) DEC Ww ; FBI-SEAT 14