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View Diary: Boeing's outsourcing strategy in the spotlight as FAA grounds the Dreamliner (196 comments)

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  •  Apollo 13 (5+ / 0-)
    Recommended by:
    mookins, elwior, here4tehbeer, ladybug53, rbird

    Reality didn't match the documentation....

    The heater and protection thermostat were originally designed for the command module's 28-volt DC bus. The specifications for the heater and thermostat were later changed to allow a 65-volt ground supply, in order to pressurize the tanks more rapidly. Beechcraft, the tank subcontractor, did not upgrade the thermostat to handle the higher voltage. The temperature sensor could not read above the highest operational temperature of the heater, which was approximately 100 °F (38 °C). This was not normally a problem because the thermostat was designed to open at 80 °F (27 °C).

    I want 1 less Tiny Coffin, Why Don't You? Support The President's Gun Violence Plan.

    by JML9999 on Fri Jan 18, 2013 at 10:29:24 AM PST

    [ Parent ]

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