A ______ ______ is used to reduce the back and forth oscillations of the nose wheel at certain speeds.

• A. Shimmy damper
• B. Brake actuator
• C. Nose wheel steering linkage
• D. Steering damper

Answer: (A)

A shimmy damper dampens the rapid back-and-forth oscillations of the nose wheel, known as shimmy. When the nose gear experiences quick side-to-side motion at certain speeds, these oscillations can grow and cause vibration, tire wear, or control issues. The shimmy damper is a hydraulic device attached to the nose gear that resists rapid angular movement, converting the motion energy into heat and thus reducing the amplitude of the oscillations. This keeps the nose gear stable during taxi, takeoff, and landing rollout.

The other options don’t fit as the device’s primary purpose: a brake actuator operates the brakes, not the wheel’s oscillation; the nose wheel steering linkage is simply the mechanical path to steer the nose wheel and doesn’t damp high-frequency shimmy; a steering damper helps stabilize steering inputs but is not the dedicated device for suppressing nose gear shimmy.