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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.
“Seattle”11 pages
E flight LF and LCC. The power tests were accomplished at Malmstrom AFB during the week of 15 May 67. The tests were in accordance with Test Plan D2-1846-1. No sites were shut down for the test. 54 Instrumentation on the Sensitive Information Network lines and on the commercial primary power lines showed no significant noise propagation as a result of simulating the transformer failure. 55 (U) As part of the tests, one of the primary power lines at the LCC was opened and then shorted to netural. The test plan called for three operations of this sequence; however, the back-up Enviromintal Control System (ECS) failed to sequence properly and rather than jeopardize the equipment, only one sequence was performed. 56 (U) During the transformer tests, a one volt peak to peak 60 cycle signal appeared on the SIN receiving line at E-3. Also, a high current spike was seen on the primary power neutral line to launch facility ground point. The 60 cycle signal on the SIN line was insignificant because tests have indicated that frequencies in the area of 100 Kilo Cycle (KC) propagated most readily
Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 88 pages are in the text index: search them above, or from the library's search.