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Craig: I am not sure if we are referring to the same thing,
but in the mid 90's the factory modified the mixer box to include a Cabin
Shut-off valve which was cable operated. It was meant as an emergency way
to cut off airflow into the cabin from the engine in the event of a catastrophic
turbine or engine failure leading to hot oil/toxic fumes/other nasties entering
the cabin. It's use at high altitude would obviously mean you would not maintain
pressurization, but that would be down on the list of priorities at just that
moment (still something to keep in mind). So, I have mine right there below the
throttle quadrant with a big red knob on it--and hopefully will never use
it...
Doug Johnson
N654DM 930hrs TT, glue still
holding
" Do you
IV-P drivers use the Cabin Pressure Cable? The cable that controls the
mixer valve dump. "
Craig
Berland
IV-P
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