Honeywell International Inc.

Alliedsignal Inc.

Robert William Olson

Darrell Horner

Gerard McCoy

David Buck

Gerard Mccoy

The disclosure is directed to an independent manual control system of an all-electric cabin pressure control system (CPCS). The manual control system may include a momentary electrical switch to manually set the position of an outflow valve (OFV) along with a closed loop control to hold the cabin pressure at the pressure setpoint. The closed loop control of the manual control system is independent from the automatic pressure control functions of the all-electric CPCS.

Cabin pressure control system with all-electric OFV, using dis-similar manual control that performs cabin altitude hold function

An aircraft cabin pressure control system controls aircraft cabin pressure by reference to either the partial pressure or concentration of oxygen in the aircraft cabin. Data on ambient pressure, oxygen content, and total pressure are employed to control air pressure in the cabin.

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Tucson, AZ, United States of America

Robert William Olson