Which types of UY are mechanical in nature?

Which types of UY are mechanical in nature?

• A. Both Loss of Tail Rotor Authority and Loss of Tail Rotor Thrust
• B. Loss of Tail Rotor Authority
• C. Loss of Tail Rotor Thrust
• D. Pilot input errors

Answer: (A)

Yaw control in a helicopter relies on the tail rotor and its drive system. When uncommanded yaw results from mechanical issues, the problem lies in the tail rotor hardware or its drive rather than how the pilot is commanding the controls. Loss of tail rotor authority means the tail rotor cannot produce the required anti-torque effect—the system isn’t responding properly due to mechanical faults in the drive, controls, or tail rotor components. Loss of tail rotor thrust is a direct mechanical failure where the tail rotor isn't able to generate the necessary thrust to counter the main rotor torque, again caused by damage or faults in the tail rotor itself or its drive train. Both situations are about physical malfunctions within the tail rotor system, not pilot actions or purely aerodynamic effects. Pilot input errors are human factors and do not describe a mechanical failure in the tail rotor.

Yaw control in a helicopter relies on the tail rotor and its drive system. When uncommanded yaw results from mechanical issues, the problem lies in the tail rotor hardware or its drive rather than how the pilot is commanding the controls. Loss of tail rotor authority means the tail rotor cannot produce the required anti-torque effect—the system isn’t responding properly due to mechanical faults in the drive, controls, or tail rotor components. Loss of tail rotor thrust is a direct mechanical failure where the tail rotor isn't able to generate the necessary thrust to counter the main rotor torque, again caused by damage or faults in the tail rotor itself or its drive train. Both situations are about physical malfunctions within the tail rotor system, not pilot actions or purely aerodynamic effects. Pilot input errors are human factors and do not describe a mechanical failure in the tail rotor.