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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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within the LF. Also, known was that the C-53P Logic Coupler will cause Channel 9 & 12 No-GO shut down with Pulse width in the area of 10 to 100 micro sec (a 60 Cycle Per Second signal has a pulse width of approximately 16.7 milli sec). The current spike on the neutral power line did not appear to extend to the Logic Coupler interface therefore, it was not felt to be significant. 57 (0) Each time a power Pulse was initiated, by shorting the transformer or opening one phase at the LCC, E-1 and E-3 were observed to switch to emergency power momentarily. The capsule area did not report any change in status from the 10 LF's in Echo Flight as a result of power tests. 58 (U) The tests run at Boeing in the NRA have proved that the C- 53P Logic Coupler was the receiver to the noise Pulse irregularly. The normal signal on the STC in the C-53P is (-10 to 0 volt Pulse of duration between two and 200 micro sec) was applied at this point. When the Pulse width was set at 30 micro sec, 12 Channel 9 & 12 No-Go's, one Channel 9 No-Go, and four Coupler Self Tests (CST), were experienced out of 20 separate applications of the Pulse. 59 (U) In other words, 60 percent of the time the responses were the same as experienced at Echo Flight and 85 percent of the 59. Ibid.
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