How does the UH-60 tail rotor orientation affect yaw, and what are common tail rotor system failure modes to look for?

How does the UH-60 tail rotor orientation affect yaw, and what are common tail rotor system failure modes to look for?

• A. Yaw is controlled by the tail rotor through anti-torque; a failing tail rotor can produce uncommanded yaw.
• B. Tail rotor only affects vertical ascent; yaw unaffected.
• C. Tail rotor produces anti-torque; yaw changes with pedal input; failure modes include drive shaft problems, tail rotor blade damage, or hydraulic issues.
• D. Tail rotor is decoupled in a failure; yaw remains constant.

Answer: (C)

The ability to yaw a UH-60 comes from the tail rotor’s anti-torque function. The tail rotor provides thrust in the opposite direction to the main rotor’s torque, and the pedals adjust how much anti-torque thrust is produced. When you press the pedals, you change the tail rotor’s pitch (and thus thrust), which steers the nose left or right. If the tail rotor system isn’t delivering the right anti-torque—due to a fault or damage—yaw can become uncommanded or unresponsive. Common failure modes you’d look for include problems in the tail rotor drive system (like a driven shaft or gear box issue), damage to the tail rotor blades, or hydraulic control problems that prevent the tail rotor pitch from changing as commanded. These are the kinds of faults that directly compromise yaw control. Statements that imply the tail rotor only affects vertical ascent or that yaw remains constant when the tail rotor decouples aren’t accurate. The tail rotor’s main purpose is anti-torque to control yaw, and loss of tail-rotor effectiveness usually leads to loss of yaw control rather than a steady, unchanging condition.

The ability to yaw a UH-60 comes from the tail rotor’s anti-torque function. The tail rotor provides thrust in the opposite direction to the main rotor’s torque, and the pedals adjust how much anti-torque thrust is produced. When you press the pedals, you change the tail rotor’s pitch (and thus thrust), which steers the nose left or right. If the tail rotor system isn’t delivering the right anti-torque—due to a fault or damage—yaw can become uncommanded or unresponsive.

Common failure modes you’d look for include problems in the tail rotor drive system (like a driven shaft or gear box issue), damage to the tail rotor blades, or hydraulic control problems that prevent the tail rotor pitch from changing as commanded. These are the kinds of faults that directly compromise yaw control.

Statements that imply the tail rotor only affects vertical ascent or that yaw remains constant when the tail rotor decouples aren’t accurate. The tail rotor’s main purpose is anti-torque to control yaw, and loss of tail-rotor effectiveness usually leads to loss of yaw control rather than a steady, unchanging condition.