Selects/deselects Navigation Mode. Cancels GS Mode if LOC Mode is either active or armed. Cancels GP Mode if GPS Mode is either active or armed. Cancels LOC Mode if GPS Mode is active and LOC Mode is armed.

Selects the desired Heading/Track

Selects/deselects Approach Mode

Engages/disengages the autopilot

Engages the autopilot (if the autopilot is disengaged) in level vertical and lateral modes

Adjusts the vertical mode reference in Pitch Hold, Vertical Speed, Indicated Airspeed, and Altitude Hold modes

Selects/deselects Indicated Airspeed Mode

Selects the desired Altitude setting

Selects/deselects Altitude Hold Mode

Selects/deselects Vertical Path Tracking Mode for Vertical Navigation flight control

Selects/deselects Vertical Speed Mode

Engages/disengages the yaw damper

Activates/deactivates the flight director only Pressing once turns on the director in the default vertical and lateral modes. Pressing again deactivates the flight director and removes the Command Bars. If the autopilot is engaged, the key is disabled.

Selects/deselects Track (TRK) Mode

Selects/deselects Heading Select Mode