Cabin pressure is controlled electronically and is regulated electromechanical. The pressurization control system regulates and maintains cabin pressure and the rate of cabin pressure change as a function of settings on the pressure control panel. This is accomplished by regulating the exhaust airflow from the cabin through two motor-driven, variable-gate cabin outflow vales. The pressurization control system generates the necessary controlling signals to regulate the position of the outflow valve gates. This can be accomplished in any of the three modes of operation: Normal (NORM) Mode, Standby (STBY) Mode or MANUAL. The pressure control panel also provides a check (GND CHK) mode that conduct checks of the system while on the ground.
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