Which method is used to correct an out-of-tolerance toe-in condition of main landing gear wheels?

The method used to correct an out-of-tolerance toe-in condition of main landing gear wheels involves inserting, removing, or changing the location of washers or spacers. This approach allows for precise adjustments to the alignment of the wheels, which is crucial for ensuring that they are positioned correctly relative to each other and the aircraft's intended flight path.

Toe-in refers to the angle at which the wheels are set in relation to the centerline of the aircraft. When wheels are not aligned properly, this can lead to uneven tire wear, handling issues during taxiing, and can even affect flight performance. By manipulating the spacers or washers, technicians can fine-tune the position of the wheels to achieve the correct alignment as specified by the aircraft manufacturer.

This method is preferable because it directly addresses the mechanical configuration of the landing gear without necessitating broader systemic changes or component replacements. Other methods, like realigning the entire landing gear assembly or making tire pressure adjustments, do not specifically tackle the geometry of toe-in conditions as effectively.