Which control input is inappropriate when compensating for left yawing tendency?

When compensating for a left yawing tendency, the use of ailerons is considered inappropriate because ailerons primarily control roll, not yaw. A left yawing tendency typically occurs due to the effects of engine torque, P-factor, or adverse yaw. To counteract this tendency, the appropriate control inputs would involve using the rudder to apply right rudder pressure, helping to align the aircraft's nose with the desired flight path.

The other control inputs—such as using rudder or making trim adjustments—are directly related to managing yaw and can help stabilize the aircraft in flight. The elevator is used to control pitch and is not relevant when specifically addressing yaw issues, which reinforces why aileron input is not effective in this context. The focus on rudder control is crucial for maintaining proper directional stability and control during maneuvers.