What does the indication A/THR ON mean?

What does the indication A/THR ON mean?

• A. Auto Throttle Off
• B. Auto Throttle Ready
• C. Auto Throttle Inoperative
• D. Autothrottle On

Answer: (D)

Autothrottle is the system that automatically manages engine thrust to hold the aircraft at the commanded airspeed. When you see A/THR ON, it means the autothrottle is engaged and actively controlling thrust to maintain the target speed. It will adjust engine power as you climb, cruise, or descend to keep you on the programmed speed, often in coordination with the autopilot or flight director. If autothrottle is not engaged, you would see it off or a fault would show as inoperative. Some systems can be armed and ready to engage, but not actively controlling thrust until the pilot commands or the flight conditions require it.

Autothrottle is the system that automatically manages engine thrust to hold the aircraft at the commanded airspeed. When you see A/THR ON, it means the autothrottle is engaged and actively controlling thrust to maintain the target speed. It will adjust engine power as you climb, cruise, or descend to keep you on the programmed speed, often in coordination with the autopilot or flight director. If autothrottle is not engaged, you would see it off or a fault would show as inoperative. Some systems can be armed and ready to engage, but not actively controlling thrust until the pilot commands or the flight conditions require it.