Boeing 737NG

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Cabin Pressure Control System

Also from: CPCS

Consists of:

• two identical cabin pressure controllers

The controllers alternately function as the primary each flight, and operate in AUTO, ALTN and MAN modes.

Auto mode

The following data is supplied to the automatic controllers:

• ADIRUs:
• ambient static pressure
• baro corrected altitude (baro corrections from the Captain and F/O BARO reference selectors)
• non-corrected altitude
• calibrated airspeed
• stall management computers:
• throttle position
• air/ground sensors

Cabin altitude is fed into the controllers at all times on the ground. The auto mode uses DC motors.

Manual mode

The outflow valve is powered by a separate DC motor, powered by the DC Standby system. This drives the outflow valve at a slower rate than in the automatic modes.

Categories: Boeing 737NG | Air Systems

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