This rulemaking amends and harmonizes minimum altitudes for use of autopilots for transport category airplanes; it also enables the operational use of advanced autopilot and navigation systems by incorporating the capabilities of current and future autopilots, flight guidance systems, and Global Navigation Satellite System (GNSS) guidance systems while protecting the continued use of legacy systems at current autopilot minimum use altitudes. Additionally, this final rule implements a performance-based approach, using the certified capabilities of autopilot systems as established by the Airplane Flight Manual (AFM) or as approved by the Administrator.