Part 70, page 321
DB Cooper-30173Serials SE 164-81
Document date 4 December 1971
FBI 164-81, Vault Part 70 p. 321 (DB Cooper-30173), Memo, dated 4 Dec 1971 — cooper.theunsolved.net/parts/Cooper-Part-70/pages/321
Transcript
The scan is the source; the transcript is machine-generated from it.
SAC, SEATTLE (164-81) (P) 12/4/71
SA THOMAS J. MANNING
UNSUB; Northwest Airlines Flight 305 Portland to Seattle 11/24/71 OO: Seattle OAA - H IJACKING; EXTORTION
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A re[d]ent communication from Portland made reference to an [REDACTED] b6 [REDACTED] recently hearing a five minute transmission of emergency sounding b7C equipment for distresss purposes which all civilian and military aircraft carry. The Portland Division has been asked to continue contacts with National Guard based at Portland International Airport where [REDACTED] for further transmissions of this device.
Investigation at various airports throughout SW Washington have revealed from technical people familiar with this homing emergency device that frequently this device can be triggered into emitting the emergency signal upon a plane reaching a dive where 5 Gs is reached.
In view of no positive information of any type concerning the location from which this signal was transmitted (note two locations widely separated were mentioned by [REDACTED] no further investigation being b6 conducted by Longview RA. b7C
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(2) TJM/
[guess: Deib] N 164-81. 826 [guess: my] [guess: LN]
[illegible signature/initials]
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DB Cooper-30173