Portland to Seattle re feasibility of hijacker using VOR or marker beacon receiver
Document date 29 November 1971
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Id: Cooper-Part-90:177-178
Subject: Cooper Files: Cooper-Part-90:177-178 Document: Teletype Portland to Seattle re feasibility of hijacker using VOR or marker beacon receiver Id: Cooper-Part-90:177-178 Page: https://cooper.theunsolved.net/documents/Cooper-Part-90%3A177-178 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 90 pp. 177–178 (DB Cooper-40174–40175), Teletype, dated 29 Nov 1971, serial PD 164-41-74 (as read from the transcript) — cooper.theunsolved.net/documents/Cooper-Part-90%3A177-178
FD-36 (Rev. 5-22-64)
FBI
Date: 11/29/71
Transmit the following in _________ PLAINTEXT (Type in plaintext or code)
Via __TELETYPE__ _________ URGENT (Priority)
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TO: SEATTLE (164-81)
FROM: PORTLAND (164-41) (P) 2 PAGES
UNSUB; NORTHWEST AIRLINES FLIGHT THREE ZERO FIVE, NOVEMBER TWENTYFOUR, SEVENTYONE, CAA - HIGHJACKING; EXTORTION, OO:SEATTLE.
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RE SEATTLE TELETYPE TO PORTLAND, NOVEMBER TWENTYNINE, SEVENTY- ONE; AND PORTLAND TELEPHONE CALL TO SEATTLE, SAME DATE.
[redacted line]
WAS CONTACTED AND ADVISED THAT A VOR RECEIVING DEVICE WOULD BE TOO BULKY TO BE CARRIED ABOARD THE FLIGHT UNSEEN, AND DUE TO THE TECHNICAL EFFORT OF THE DEVICE, IT WOULD PROBABLY REQUIRE A GOOD DEAL OF TRAINING IN ORDER TO OPERATE IT. HE ADVISED TH[illegible] THE SMALLEST MODEL OF THE VOR RECEIVING DEVICE IS TWO POINT SIX INCHES BY THREE POINT TWO INCHES BY TEN POINT SEVEN IN LENGTH, WEIGHING TWO POINT SEVEN POUNDS. SUCH A RECEIVER WOULD REQUIRE A TWELVE VOLT BATTERY TO OPERATE PROPERLY, AND A HORIZONTAL - POLARIZED ANTENNA APPROXIMATELY THREE FEET IN LENGTH WHICH WOULD EITHER HAVE TO BE EXTENDED FROM THE AIRPLANE OR ATTACHED TO THE WINDOW IN A VERTICAL POSITION.
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(1) Portland
RLB:kry (Ap)proved: ___________ Special Agent in Charge
Sent 5:26 M Per [signature]
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004 b6 b7C 164-41-74
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U.S. GOVERNMENT PRINTING OFFICE: 1971-413-135 DB Cooper-40174
FD-36 (Rev. 5-22-64)
FBI
Date:
Transmit the following in _______________ (Type in plaintext or code) Via _______________ (Priority)
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PD 164-41
PAGE TWO
[REDACTED] ADVISED THAT THE MOST LIKELY DEVICE TO BE USED IN SUCH A MANNER, AND DUE TO THE FLIGHT OF THE AIRCRAFT, WOULD BE THE MARKER BEACON RECEIVER, WHICH ACCORDING TO [REDACTED] COULD BE MADE BY ANY PERSON WITH THE SLIGHTEST KNOWLEDGE OF COMMUNICATION OR RADIO EQUIPMENT. SUCH A DEVICE COULD BE THE SIZE OF A PACKAGE OF CIGARETTES OR FOR A MORE EXACTING DEVICE, COULD BE ANY SIZE. [REDACTED] ADVISED THAT THE BEACON RECEIVER WOULD WORK ON A NINE VOLT TRANSISTOR BATTERY AND SERIES WITH A NORMAL FLASHLIGHT BATTERY. SUCH A DEVICE CAN BE PURCHASED FROM ANY OF THE AVIATION COMPANIES FOR APPROXIMATELY TWO HUNDRED SEVENTYFIVE DOLLARS, WHICH [REDACTED] ADVISED IS THE MINIMUM PRICE. ACCORDING TO [REDACTED], THE MARKER BECON RECEIVER WILL NOT INTERFER WITH ANY OF THE AIRCRAFT INSTRU- MENTS, NOR CAN IT BE DETECTED WHILE IN USE.
[REDACTED] ADVISED THE DISTRIBUTORS OF SUCH A DEVICE IS NARCO AVIONICS, WHICH HAS DISTRIBUTORS THROUGHOUT THE COUNTRY, INCLUDING FIVE IN OREGON AND FIVE IN WASHINGTON.
BASED UPON THE ABOVE INFORMATION AND PORTLAND TELEPHONE CALL TO SEATTLE, IT IS SUGGESTED SEATTLE DIVISION REEVALUATE LEADS SET OUT IN REFERENCED COMMUNICATION.
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Approved: _______________ Sent _______________M Per _______________ Special Agent in Charge U.S. GOVERNMENT PRINTING OFFICE: 1971-413-135 DB Cooper-40175
Serials: PD 164-41, PD 164-41-74, SE 164-81