Minimum altitudes for use of autopilot

This regulation sets minimum altitudes for autopilot use in Part 121 airline operations, based on the aircraft's Flight Manual and the phase of flight.

Takeoff/Initial Climb: Autopilot cannot be engaged below 500 feet above the airport or twice the altitude loss specified in the AFM for autopilot failure (whichever is higher), unless the AFM or Administrator specifies otherwise.

Enroute: Autopilot must stay off below 500 feet above terrain or twice the AFM's specified altitude loss for malfunction, whichever is greater.

Approach: Generally, autopilot must be disconnected by 50 feet below the decision altitude or minimum descent altitude. However, lower altitudes are permitted based on the AFM's specifications and whether the aircraft is coupled to both lateral and vertical guidance, with weather conditions also affecting the minimums.

Go-around: You cannot *engage* autopilot below the takeoff minimum, but if already engaged during approach, it may remain on through the missed approach.

Landing: Approved automatic landing systems have no minimum altitude restrictions.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*