Is MACH Trim disabled when Auto Pilot is in use?

Is MACH Trim disabled when Auto Pilot is in use?

• A. Yes
• B. No
• C. Only at certain altitudes
• D. Only in manual mode

Answer: (A)

Mach trim is a function that automatically adjusts elevator trim to help maintain the aircraft’s trim as Mach number changes. When the autopilot is engaged, the flight control system takes over trimming and flight-path management, so manual trim inputs, including Mach trim, are ignored to avoid conflicting commands. This ensures the autopilot can maintain the desired Mach and flight path smoothly without competing trim inputs from the pilot.

Mach trim is a function that automatically adjusts elevator trim to help maintain the aircraft’s trim as Mach number changes. When the autopilot is engaged, the flight control system takes over trimming and flight-path management, so manual trim inputs, including Mach trim, are ignored to avoid conflicting commands. This ensures the autopilot can maintain the desired Mach and flight path smoothly without competing trim inputs from the pilot.