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Echo flights of fantasy - part two

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James Carlson: The discussion regarding the cause of the Echo Flight Incident continues in the 341st Strategic Missile Wing and Combat Support Group Command History covering April-June 1967. "During testing at Boeing, a 30 micro sec Pulse (-10 to 0 volt square wave) was placed on the Self Test Command (STC) line at the C-53P Coupler Logic Drawer interface (STC). Seven out of 10 separate applications of a single Pulse, would cause the system to shut down with a Channel 9 & 12 No-Go.

"Subsequent testing at Autonetics has resulted in the following explanation of what probably happens in the Coupler Logic Drawer. The Pulse inserted is long enough to initiate the Coupler Self test sequence within the C-53P. However, it is not of long enough duration to enable control lines to the computer to place the computer in a Coupler test loop Mode. This causes the Coupler to issue a sequence error due to lack of coincidence between G&C and Coupler Modes. This sequence error, together with the action of two other flip flop outputs (M-17 & M-20), is sufficient to initiate the Coupler and G&C No-Go shut down.

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