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This Black Vault release contains the Air Force's 2001 response from the 341st Space Wing FOIA office at Malmstrom AFB, Montana, to a request about the 16 March 1967 Echo Flight missile shutdown, with excerpts from 341st Strategic Missile Wing histories covering 1967 to early 1968. The histories say all ten Echo Flight launch facilities lost strategic alert almost simultaneously. Investigators could not find a logical cause and found rumors of UFOs near Echo Flight to be unfounded.
“Headquarters”14 pages
FIRM NAME AND ADDRESS THE BOEING COMPANY P.O. BOX 1955 SEATTLE, WASH. 9824 (BOE 720) ENGINEERING CHANGE PROPOSAL FACILITY DATE 27 December 1966 1 MCL NO. ATTACHMENT A1 2827 MFG CODE SYSTEM DESIGNATION WS133A IECP NO. 528 TYPE I REV. COMPETITION 2 CONTRACTOR'S RECOMMENDED PRIORITY [ ] EMERGENCY [ ] URGENT [ X ] ROUTINE [ ] CONSTITUENTITY 3 CONTRACT END ITEM NOMINATION Launch Facility 4 NAME OF PART OR LOWEST ASSEMBLY AFFECTED Launch Facility Support Building 5 TITLE OF CHANGE DC Supply for Isolation Relays - VRSA Channels 26 and 27 (LF) 6 DESCRIPTION OF CHANGE Provide DC supply for the isolation relays being installed in VRSA channels 26 and 27 per ECP 1141. A typical DC supply circuit for these relays is shown on Attachment A Sketch 1. ADDITIONAL DESCRIPTION: Instructions for retest of VRSA Channels 26 and 27 and for personnel and weapon system safety will be required. 7 JUSTIFICATION FOR CHANGE The isolation relays are being installed in VRSA channels 26 and 27 per ECP 1141. The DC power required for these relays is to be supplied from the RPIE power System. This FCIR initiates the required RPIE change. REQUESTED BY PROCURING ACTIVITY PER REF: FWG Meeting 90 DATE: 29 November 66 ATTACHMENT 0 PAGE 6 8 DEVELOPMENTAL REQUIREMENTS N/A ARE DESIGN REQ'D Yes DATE TBD 9 ALTERNATIVE SOLUTIONS No alternate solutions are considered feasible 10 RECOMMENDED PRODUCTION EFFECTIVITY N/A 11 ESTIMATED COST FOR CHANGE IN PRODUCTION N/A 12 RECOMMENDED FOR RETROfit Retrofit required to provide wiring changes for isolation relays to be installed by ECP 1141 13 RECOMMENDED RECOMMENDED EFFECTIVITY VAFB, LF's 02 - 09; VAFB, EAFB, MTAFB, WAFB, FEWAFB - All Flights HETF, LFSB MOCKUP AFFECTED YES X NO
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