I described the function of the Cabin Pressure Control system of the Lockheed L-1011 in a previous posting: Original Flight Hardware: Cabin Pressure Control (Sub-Panel) In this analysis we will discover that the actual control panel is a rather simple device consisting of a number of switches and two tapes for ALTidude SET and BAROmetric pressure SET. The pressurization control module on the L-1011 was built/designed by the engineering company Hamilton Standard. (By the way, they also designed the life-support systems for NASA's space suits amongst many many other things).
The only enclosure component that can be easily removed is the top panel.
Top View
The tape mechanism in the cabin pressure control module is significantly simpler than the tape used in the trailing edge flaps indicator. In essence, the tapes are the same size as 35mm motion picture film and use a similar transport mechanism (one perforation side only) with a supply and a take-up reel. For position encoding, the tape is linked to a potentiometer (see image below).
The original flight hardware had a number of pressure switches that would actuate different functions of the instrument. The pressure switch and the pressure transducer in the image below will not serve any function once we re-work the module to connect to the flight simulator.
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