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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.
“King”3 pages
Read from the scan by GLM-OCR; expect the odd misread word.
Line 6 - DESCRIPTION OF CHANGE: (Continued from Page 1) B. Provide detail engineering design, specifications and documentation for modifying Figure A's 1377 and 1377M - Interconnecting (I) Box. This modification will consist of the addition of sub-assemblies within the existing I-Box. One sub-assembly will contain zener diodes, isolation transformers and common mode rejection coils for each STN/EIM, 194L and Status line CIRCUIT PAIRS mounted on a sheet metal bracket and electrically connected by means of a separate wire bundle. The existing wire bundle in the I-Box will also be modified. When a site has operational Hardened Voice Channel (HVC) circuits connected for use, a second sub-assembly using zener diodes, isolation transformer and common mode rejection coils will be added. Note: This change for Figure A 1377 and 1377M is es follows: Figure A 1377 (Wings III, V, VAFB, HETF and CAFB) for inclusion of accommodation of EMP protection for SCN/SDN, Hardened Voice Channel (HVC) and Status lines. Figure A 1377M (Kings I, II, IV, VAFB, STP III, KPA and EDL) for SCN/SIN, HVC and L94L. E. Fabricate production prototypes and provide kits and engineering for EDL and NHA,STP III evaluation. Additional Qualification Tests are not recommended. C. Provide special tools required for Figure A's 1377 and 1377M kit installation and checkout in the field. D. This ECP will provide a King IV Type Figure A 137TH Interconnecting Box for STP III. F. Identify weight change to the Figure A's 1377 and 1377M Interconnecting Box. G. Revise ACO 6359 and ACO 8302 documentation to allow physical and electrical connection with the revised Figure A's 1377 and 1377M Interconnecting Box. H. This ECP 1221 change shall be incorporated concurrently with ECP 1141. I. Analysis Revision Notices for Figure A's 1377.4, 1377.1 and 1377.7 are submitted herewith for approval.
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.