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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
Read from the scan by GLM-OCR; expect the odd misread word.
## Continuous to the Glengarry substation at Lewistown and the other to the Harlowton substation. The Glengarry substation feeds the Hilger substation with 50 KV lines and Hilger feeds the Winifred substation with 50 KV lines. The sites are fed by 7.2 KV lines. (U) A 7.2 KV transformer shorted in the line to site E-3 at 1450, 16 March 67. This transformer is located on a farm two miles south of the Winifred substation. Automatic reclosure switches at Winifred substation opened, and were reclosed manually after transformer replacement later in the day. This caused the Brine Chiller problem at E-1. The transformer was in the West phase. It was not determined which phase this corresponds to at the sites. Sites E-3, E-5, E-6, E-9, and E-10 transferred to Standby Power. Sites E-1 transferred to Direct Current (DC) operation. (U) On 28 March 67, the 341st SMW in conjunction with the Montana Power Company conducted a switching test on the 50 KV high voltage line between the Harlowton and Glengarry substations. The test was performed at the request of OOAMA/OONE as a part of the initial Echo Flight incident investigation performed at Malmstrom. The intent of the test was to verify correlation, if possible, between high voltage switching and launch facility shutdown or other launch facility faults. (U)
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.