The white ‘ALTS’ annunciation indicates Selected Altitude Capture Mode is armed. Touch the AFCS Status Box on the PFW and touch the ALT Button or use the AFCS Mode Controller and touch the ALT Key. Use the Outer DCK associated with the PFW and adjust the Selected Altitude until the Selected Altitude Capture Mode becomes active.

As the aircraft nears the Selected Altitude, the flight director automatically transitions to Selected Altitude Capture Mode with Altitude Hold Mode armed. This automatic transition is indicated by the green ‘ALTS’ annunciation flashing for up to 10 seconds and the appearance of the white ‘ALTS’ annunciation. The Selected Altitude is shown as the Altitude Reference beside the ‘ALTS’ annunciation.

At 50 feet from the Selected Altitude, the flight director automatically transitions from Selected Altitude Capture to Altitude Hold Mode and holds the reference altitude. As Altitude Hold Mode becomes active, the white ‘ALTS’ annunciation moves to the active vertical mode field and flashes green for 10 seconds to indicate the automatic transition.

Changing the Selected Altitude while Selected Altitude Capture Mode is active causes the autopilot to revert to Pitch Hold Mode with Selected Altitude Capture Mode armed for the new Selected Altitude.