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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. These cams line up the wheel and axle assembly in the straight-ahead position when the shock strut is fully extended. This allows the nose wheel to enter the wheel well when the nose gear is retracted and prevents structural damage to the aircraft. It also aligns the wheels with the longitudinal axis of the aircraft prior to landing when the strut is fully extended. [Figure 13-20] Many nose gear shock struts also have attachments for the installation of an external shimmy damper. [Figure 13-21] 

Nose gear struts are often equipped with a locking or disconnect pin to enable quick turning of the aircraft while 

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