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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.
“Hill”4 pages
ANALYSIS REVISION NOTICE The Boring Company ARN NO: VMA-133
ORIGINATOR: J. J. Wikert SUBMITTAL DATE: 10-24-57 EFFECTIVITY: VAFB LF's 02,03,06,07&09
CONTRACTOR APPROVAL: W. A. Shook BSD. STL APPROVAL EIP REF. NO: 1221
VOLUME TITLE: Operational Ground Equipment: Unmodernized VAFB Supplement D2-12130 Vol. II SECT: PAGE:
FORM DWG. TITLE: Figure A 1377.1 Rev. D 4-7-66 Interconnecting Boxes (Various) NO.: 1377.1 SHT NO.: 1 & 2
ACTION AND REASON
Approval of this change will result in a change to the Figure A revision code.
ACTION
1. Revise first sentence I. B. to read as follows:
"I. B. A method of connecting signals transmitted between the Launcher Support Building and the launcher equipments via the Cable Assembly Set, Launcher (Figure A 1248.1)"
2. Revise Technical Requirement I. D. to read as follows:
"I. D. A method of mating the site unique signals of the Cable System Pressurized, Hardened, SCN (Figure A 1339 or Figure A 9032M) to the site common signals of the Cable Assembly Set, Launcher (Figure A 1248.1)
3. Add Technical Requirement I. E. as follows:
"I. E. Means shall be provided which shall meet the requirements listed below. 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."
The following HICS lines are referred to:
Command
SIN
HVC (where applicable)
Requirements:
1. The Common mode (line to equipment chassis) voltage envelope on any line (listed above) at the output of the Interconnecting Box shall have a peak value of 600 volts if no sharp discharge occurs at the input. If a sharp discharge occurs at the input the voltage output shall not have a sharp discharge which is greater than 80 volts amplitude, nor shall the voltage output exceed the envelope defined by:
$V(t) = \pm 100 e^{-.7 ft} volts$
$f = frequency (Hz)$
$t = time (sec.)$ Document, cited by the archive. The PDF is mirrored here; the original link is under it. The text was read from the page images by an OCR model; expect the odd misread word. 88 pages are in the text index: search them above, or from the library's search.