Which parameter is NOT part of the TAD's input to compute rudder trim?

• A. Engine torque
• B. Airspeed
• C. Altitude
• D. Pitch angle

Answer: (D)

Rudder trim is designed to counter yaw moments, especially those from thrust asymmetry. The TAD uses inputs that directly affect yaw: engine torque (how much uneven thrust is present), airspeed (how strongly the rudder and the yawing moment respond to that thrust), and altitude (air density changes with altitude, affecting both aerodynamic yaw response and the trim force needed). These factors determine how much rudder trim is required to maintain a steady, coordinated flight path.

Pitch angle, on the other hand, is about the nose attitude and angle of attack. It doesn’t create a steady yaw moment that would drive the need for rudder trim, so it isn’t part of the TAD’s input to compute rudder trim.