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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.
Read from the scan by GLM-OCR; expect the odd misread word.
be a receiver to this same type of noise Pulse.
Results of these tests were directly determining C-53D Logic Coupler (Minuteman II system) to EMP type noise. The C-53D Logic Coupler was found to be susceptible to input noise injection which resulted in an non EWO system condition. (U)
This test was made in two phases; however the results of Phase II is not yet available to this office. (U)
Phase I consisted of a correlation of noise inputs on the C-53D Coupler interface to system noise response. Preliminary conclusions of Phase I testing indicated that Minuteman II system was vulnerable to noise on the C-53D Logic Coupler input interface lines. Four input lines in the C-53D Logic Coupler were found to be susceptible to input noise injection which results in a non EWD status.
Phase II test objectives were to determine the percentage of coupling from the input of the Electral Surge Arresstor (ESA) panel to the interface of the Logic Coupler. $ ^{1 4 2} $ (0)
The probability of a non EWO accuracy due to a EMP noise pulse can not be defined until OOAMA's Phase I and II test 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.