SA Manning to SAC Seattle re emergency signal transmission in Portland area
Document date 4 December 1971
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Id: Cooper-Part-70:321-321
Subject: Cooper Files: Cooper-Part-70:321-321 Document: Memo SA Manning to SAC Seattle re emergency signal transmission in Portland area Id: Cooper-Part-70:321-321 Page: https://cooper.theunsolved.net/documents/Cooper-Part-70%3A321-321 What is wrong (title, date, type, which pages belong together, copies)? What does the scan show?
A person reads every report. Corrections are made by hand, to the data — titles, dates, names, which pages belong together — never to the scans, and they can take a while to appear.
FBI 164-81, Vault Part 70 p. 321 (DB Cooper-30173), Memo, dated 4 Dec 1971 — cooper.theunsolved.net/documents/Cooper-Part-70%3A321-321
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
Serials: SE 164-81