AM.II.E.S17

From the FAA library

• Aviation Maintenance Technician Handbook - Airframep. 13-30
  Chapter 13: Aircraft Landing Gear Systems › Nose Wheel Steering Systems › Shimmy Dampers

  Shimmy Dampers Torque links attached from the stationary upper cylinder of a nose wheel strut to the bottom moveable cylinder or piston of the strut are not sufficient to prevent most nose gear from the tendency to oscillate rapidly ... shimmy, at certain speeds. This vibration must be controlled through the use of a shimmy damper. A shimmy damper controls nose wheel shimmy through hydraulic damping. The damper can be built integrally within the nose gear, but most often…

• Aviation Maintenance Technician Handbook - Airframep. 13-32
  Chapter 13: Aircraft Landing Gear Systems › Shimmy Dampers › Piston-Type

  Piston-Type Aircraft not equipped with hydraulic nose wheel steering utilize an additional external shimmy damper unit. The case is attached firmly to the upper shock strut cylinder. The shaft is attached to the lower shock strut cylinder ... piston inside the shimmy damper. As the lower strut cylinder tries to shimmy, hydraulic fluid is forced through a bleed hole in the piston. The restricted flow through the bleed hole dampens the oscillation. [Figure 13-55] Figure…

• Aviation Maintenance Technician Handbook - Airframep. 13-9
  Chapter 13: Aircraft Landing Gear Systems › Shock Absorbing & Non-Shock Absorbing Landing Gear › Shock Struts

  other end is attached to the lower cylinder (piston), so it cannot rotate. This keeps the wheels aligned. The links also retain the piston in the end of the upper cylinder when the strut is extended, such as after takeoff ... Figure 13-19] Nose gear shock struts are provided with a locating cam assembly to keep the gear aligned. A cam protrusion is attached to the lower cylinder, and a mating lower cam recess is attached to the upper cylinder…