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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.
ANALYSIS REVISION NOTICE ARN NO: MA-338 ORIGINATOR: L. Proffitt SUBMITTAL DATE: October 24, 1967 CONTRACTOR APPROVAL: E. A. Melick DSD, STL APPROVAL VOLUME TITLE: Operational Ground Equipment Modernized Wing IV D2-15800-1 SECT: PAGE: FORM, DWG. TITLE: Interconnecting Boxes, Fig. A 1377M Rev. C dated 8-9-67 NO.: 1377M SHT NO.: 1, 3 ACTION AND REASON Approval of this ARN will not result in a change to the revision code letter. ACTION 1. Revise the second sentence of paragraph I.F. to read: "Requirements shall be met when the input is a 0 to 2200 volt pulse with a rise time of from 1 to 225 microseconds and the volt-time integral is the integral of the pulse shape described in D2-18148 -4(S) dated 22 August, 1967." 2. Revise paragraph II.H to read: "H.1, To limit voltage pulses at the output of the I-Box to values described in paragraphs I.F.1 and I.F.2, a suppression assembly containing an isolation type transformer, zener diodes and common mode rejection coil will be connected in each Command, HVC, and 494L circuit. For each SIN circuit, a suppression assembly similar to the Command line assembly will be provided that contains an inductor wired between the primary and secondary winding center taps of the isolation transformer for the Missile Away signal path." "H.2, Degradation of operational message reliability on lines noted resulting from functioning of the noise suppression assembly will be prevented by selection of components to limit the additional circuit inductance to be compatible with existing communication specifications." "H3, Introduction of unacceptable noise and signal degradation on other lines in the I-Box during functioning of the suppression assembly will be prevented by design of the input bundle assembly which ensures that its shields are tied as closely as practicable to the outer shield of the input cable." "H4, Components shall be selected to accept the energy specified in paragraph I.F.5 without degradation." 3. Revise Identification Spec. notation, sheet 3, to read; "See Identification Spec: S-133-111-1-100 (Wings I-V) S-133-111-1-145 (Wings LM-VM) REASON To add revisions reviewed at ECP 1221/1141 In-Process Review dated 10/13/67. (See ARN MA-339 for ECP 1141 revisions).
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.