What is the maximum nosewheel steering range with differential braking?

• A. 30 degrees
• B. 45 degrees
• C. 60 degrees
• D. 75 degrees

Answer: (C)

The concept being tested is how ground steering can be enhanced beyond the nosewheel’s own deflection by using differential braking. On the PC-12 NGX, you can steer on the ground not only with the nosewheel hydraulic actuator but also by applying opposite brakes on the main gears. That brake-induced yaw helps the airplane pivot more sharply, effectively increasing the steering range you can use during taxi.

The system is designed to allow up to 60 degrees of nosewheel steering when differential braking is used. This limit protects the tires and structure from excessive scrub and maintains predictable handling at low speeds. So the maximum steering range you can achieve with differential braking is 60 degrees. Smaller values would be without braking assistance, and larger values would exceed safe mechanical and handling limits.