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CABIN PRESSURE Control Panel

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CABIN PRESSURE Control Panel

Overview

The CABIN PRESSURE Control Panel is responsible for setting and managing cabin altitude and pressurization rate during flight. It supports both automatic and manual modes for controlling landing elevation and pressurization, allowing flight crews to intervene when necessary.

Panel Components

LDG ELEV MODE Switch

  • This button toggles between automatic and manual modes for setting the landing field elevation.

    • When pushed:

      • The landing elevation is automatically sourced from the Flight Management System (FMS).
      • If the FMS provides an invalid value, the AUX page displays an amber dashed line and defaults to 8000 ft.

    • When released:

      • The landing elevation must be set manually using the adjacent LDG ELEV knob.

LDG ELEV Knob

  • This rotary knob is used to manually adjust landing field elevation.

  • This control is active only when the LDG ELEV MODE switch is in manual mode.

    • The adjustment range is:
      • From -2000 ft up to 15000 ft.

Note

The manual setting is ignored if the MODE switch is in automatic.

CONTROL MODE Switch

  • This switch toggles between automatic and manual modes of cabin pressure control.

    • When pushed:

      • Automatic pressurization is enabled.

    • When released:

      • The system switches to manual cabin pressure control.
      • Manual rate must then be adjusted using the RATE knob.

RATE Knob

  • This knob is used to manually set the cabin vertical speed when in manual control mode.

    • The adjustable range is:

      • From -2000 ft/min to +2000 ft/min at sea level.

    • Effects of adjustments:

      • Positive rate increases cabin altitude.
      • Negative rate decreases cabin altitude.

Note

This knob only functions when the CONTROL MODE switch is not pushed (manual mode enabled).

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