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The altitude alert system provides an aural and visual indication when approaching a selected altitude (acquisition) or departing from a selected altitude (deviation). An altitude and the appropriate barometric setting can be selected on the altitude alert control panel. The captain’s altimeter/alticoder set provides altitude information based on 1013 mb, which is compared with the selected altitude.

The altitude alert warning light illuminates steadily between 900 ft and 300 ft above or below the selected altitude when approaching the selected altitude. The light flashes as a warning when deviating from the selected altitude, between 300 ft and 900 ft above or below the selected altitude.

A two-second aural warning sounds at 900 ft from the selected altitude during acquisition and at 300 ft from the selected altitude during deviation.

The altitude alert controller is reset to the acquisition mode either by manually depressing the altitude setting selector or automatically after departing 900 ft from the previously selected altitude.

The deviation mode is deactivated when the flaps are extended to 40° or 50°.