Document date 4 December 1971AIDates: machine-written — generated by an AI model from the transcripts, and it can be wrong. The scan is the source; the transcript is machine-generated from it.
FBI 164-81, Vault Part 14 p. 254 (DB Cooper-3621), Memo, dated 4 Dec 1971, serial SE 164-81-826 (as read from the transcript) — cooper.theunsolved.net/parts/Cooper-Part-14/pages/254
The scan is the source; the transcript is machine-generated from it.
OPTIONAL FORM NO. 10
MAY 1962 EDITION
GSA GEN. REG. NO. 27
5010-108-08
UNITED STATES GOVERNMENT
Memorandum
TO : SAC, SEATTLE (164-81) (P) DATE: 12/4/71
FROM : SA THOMAS J. MANNING Sub- N
SUBJECT: UNSUB;
Northwest Airlines Flight 305
Portland to Seattle 11/24/71
00: Seattle
CAA - H IJACKING; EXTORTION
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A re[guess: cent] communication from Portland made reference to an
[REDACTED] recently hearing a five minute transmission of emergency sending
equipment for distress 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.
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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.
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In view of no positive information of any type concerning the location
from which this signal was transmitted (note two locations widely sepearated
were mentioned by [REDACTED] no further investigation being
conducted by Longview RA.