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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.
Read from the scan by GLM-OCR; expect the odd misread word.
10 separate applications of a single Pulse, would cause the system to shut down with a Channel 9 & 12 No-Go. (U) Subsequent testing at Autonetics has resulted in the following explanation of what probably happens in the Coupler Logic Drawer. The Pulse inserted is long enough to initiate the Coupler Self test sequence within the C-53P. However, it is not of long enough duration to enable control lines to the computer to place the computer in a Coupler test loop Mode. This causes the Coupler to issue a sequence error due to lack of coincidence between G&C and Coupler Modes. This sequence error, together with the action of two other flip flop outputs (M-17 & M-20), is sufficient to initiate the Coupler and G&C No-Go shut down. The effort at Boeing NRA was to determine the source and most likely path of noise Pulse to the Logic Coupler. The results fo the Electro Magnetic Pulse (EMP) testing at the LF and Wing IV indicated that the Sensitive Information Network (SIN) were susceptible to noise of the type that could have caused the problem. 48 (U) The SIN lines go only from the LCC to all of the LF's in the flight, which could explain the flight perculiar aspect of the problem. 49 46. Msg, (S) OONE 01204, OOAMA to SAC, "Malmstrom E Flight Problem Weekly Status," 17 Apr 67, Ex 46. 48. Ibid. 47. Ibid. 49. Ibid.
Document, cited by the archive. The PDF is mirrored here; the original link is above. The text was read from the page images by GLM-OCR; expect the odd misread word. 88 pages are in the text index: search them above, or from the library's search.