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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
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there was a power transfer. Headquarters, 15th AF ordered a test to determine if the channel 20 was being caused by noise or a phase sequence problem. If phase relation was the problem, it could possibly damage both the motor generator and the G&C cooler compressor unit. The test was to cover such items as current draw, voltage drop and the phase relation between the primary power and the 206 volt, t0 hertz (cycles per second) motor generator output at the time of the power transfer. 86 (U) a meeting on the ViSA channel 20 alarm and direct current to alternating current problem was held at Sm SU Headquarters, Norton AFD, California, on 27 February. Field tests were required before any corrective action could be planned however. The 341st DCH and the Boeing Company conducted a joint study to determine the frequency of the channel 20 alarms by site, and by date, with all related material. The tests were begun in late February and continued through to the end of the quarter. 87 ## MODIFICATION - EMP TESTING (U) In direct relation to an incicont covered in the April June 1967 history of the 341st SKW was the Electro-Nagnetic Pulse
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.