Which trim is used for flap compensation?

Which trim is used for flap compensation?

• A. Manual Trim
• B. Autopilot Trim
• C. Auto Trim (Flap Compensation)
• D. Mach Trim

Answer: (C)

Flap movements change the aircraft’s aerodynamic balance and create a pitching moment that can cause the nose to rise or fall. An automatic trim system designed for flap compensation senses the flap position and automatically adjusts the stabilizer trim to counteract that moment. This keeps the airplane at the selected pitch without the pilot having to manually trim every time flaps change, which is a big workload reducer during flap extension and retraction, especially on approaches and landings. Manual trim requires pilot input, so it isn’t automatic. Autopilot trim is linked to the autopilot system and isn’t specifically dedicated to flap-induced changes. Mach trim maintains a target Mach number at high speeds and doesn’t address the pitch changes caused by flap deployment. That’s why the trim used for flap compensation is Auto Trim (Flap Compensation).

Flap movements change the aircraft’s aerodynamic balance and create a pitching moment that can cause the nose to rise or fall. An automatic trim system designed for flap compensation senses the flap position and automatically adjusts the stabilizer trim to counteract that moment. This keeps the airplane at the selected pitch without the pilot having to manually trim every time flaps change, which is a big workload reducer during flap extension and retraction, especially on approaches and landings.

Manual trim requires pilot input, so it isn’t automatic. Autopilot trim is linked to the autopilot system and isn’t specifically dedicated to flap-induced changes. Mach trim maintains a target Mach number at high speeds and doesn’t address the pitch changes caused by flap deployment. That’s why the trim used for flap compensation is Auto Trim (Flap Compensation).