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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.
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The best possible source of the noise Pulse, so far in the analysis, was the transformer failure which occurred at a stock watering through the Echo flight area. The shorting to ground of the single phase transformer may have unbalanced the three phase "Y" connected system enough to cause ground currents to flow back to the generator. The Hardened Intersite Cable (HIC) shields would provide a path for the ground current thus inducing voltage Pulses on the SIN lines to all LF's. $^{50}$ (U)
Testing at NRA has proven that there is significant coupling between the shields of the SIN lines and the Self Test Command (STC) line into the C-53P Logic Coupler. $^{51}$ (U)
A conference was held at Boeing on 18 April 67 for the task team to review the preliminary test plan for LF, E-78, at Halmstrom. Also, a test plan was reviewed to accomplish the transformer failure simulation tests at Halmstrom. Boeing had co-ordinated with the power company, and received their approval for the tests. $^{52}$ (U)
It was the consensus of the task group that the transformer tests should be run as soon as possible so that the data would be available for the E-78 test plan development. The plan was to instrumently connect the HIC lines and power line into both one 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.