Which gearbox is responsible for changing the direction of power flow to the tail rotor assembly?

• A. Main Transmission
• B. Intermediate Gearbox
• C. 90 Degree Tail Rotor Gearbox
• D. Power Distribution Box

Answer: (C)

The 90 Degree Tail Rotor Gearbox is integral in changing the direction of power flow to the tail rotor assembly. Its primary function is to take the rotational energy produced by the main rotor transmission and redirect it 90 degrees to drive the tail rotor. This redirection is essential for controlling the aircraft's yaw and maintaining stability, as the tail rotor counteracts the torque generated by the main rotor.

This gearbox is typically designed to handle the specific loads and stress associated with tail rotor operation, making it a crucial component in the overall transmission system of a helicopter. By ensuring that power is efficiently transferred and correctly oriented, the 90 Degree Tail Rotor Gearbox plays a vital role in the helicopter's performance and maneuverability.