What is a shimmy damper and where is it used?

• A. A device that dampens lateral oscillations of the nose wheel to prevent shimmy during taxi and landing roll.
• B. A device to reduce vertical bounce of the main gear.
• C. An electrical generator.
• D. A brake actuator.

Answer: (A)

A shimmy damper is a device that dampens lateral oscillations of the nose wheel to prevent shimmy during taxi and landing roll. Shimmy is a rapid side-to-side vibration of the nose gear that can occur from steering inputs, rough pavement, or gusts, and if not controlled it can damage tires and the gear itself. The damper works by providing hydraulic (or friction-based) resistance to swift nose-wheel movement, converting that kinetic energy into heat and thereby reducing the amplitude of the oscillation. It’s mounted in the nose gear assembly to specifically curb sideways motion, not vertical bounce like the main-gear oleo dampers, and it isn’t an electrical generator or a brake actuator.