PRESSURIZATION

CABIN ALT SELECTOR KNOB

DOWN (Momentary action): Closes the outflow valve manually.

STOP: Normal position.

UP (Momentary action): Opens the outflow valve manually.

MODE SELECTOR KNOB

MAN: Manual control of the outflow valve. No automatic cabin depressurization on the ground after landing.

AUTO: Automatic operation, changes between the different pressurization modes.

LFE CTRL: Allows manual input of the landing field elevation, pressurization remains in auto mode. FMS derived LFE is shown in green. Manually selected LFE will be displayed with a “M” in front of the altitude readout and in cyan.

Note: Flight plan must be closed to display LFE.

DUMP BUTTON

PUSH IN: CPCS system operates automatically

PUSH OUT: Returns the system to normal operation.

Note: Not available in manual mode. If pushed in while in manual mode both recirculation fans and packs are turned off.

LFE SELECTOR KNOB

DOWN (Momentary action): Decreases LFE in 100 ft increments.

STOP: Normal position.

UP (Momentary position): Increases the LFE in 100 ft increments

Note: Only works when the MODE selector knob is in LFE CTRL.