Pedals produce minimal yaw effect and the aircraft fails to coordinate turns as commanded.

• A. Elevator System Jammed
• B. Rudder System Jammed
• C. Stabilizer Trim Runaway
• D. Unreliable Airspeed

Answer: (B)

Yaw control in a coordinated turn comes from the rudder responding to pedal input to balance the aircraft’s yaw as you roll into a bank. If the rudder system is jammed, the rudder doesn’t move or moves only slightly, so pedals produce little yaw and the airplane can’t coordinate the turn as commanded. The other options affect pitch or trim rather than yaw: an elevator system jam would disrupt pitch control, a stabilizer trim runaway changes pitch trim, and unreliable airspeed affects overall performance and control effectiveness, not the ability to yaw or coordinate turns. So the symptom points to a jammed rudder system.