Achieving the correct toe-in/toe-out or camber alignment on your aircraft’s landing gear starts with accurately measuring the wheel position. Follow the steps below to determine the exact correction angle and select the proper shim.

1. Support the aircraft in a level, flying-attitude stance.
2. Chalkline the center-line of the aircraft onto the floor:
   • Use a plumb-bob to mark a point directly beneath the firewall center.
   • Use a plumb-bob to mark a point directly beneath the tail center.
   • Connect these two points with chalk to establish the aircraft center-line.
3. Place a straight edge (typically 36″ long) against the outside of the tire, ensuring it is:
   • Parallel to the floor
   • Centered vertically on the wheel
4. Mark the floor directly beneath each end of the straight edge using a plumb-bob or square.
5. Measure and record distances “A” and “B” (in inches) from those marks to the center-line. Record each to two decimal places.
6. Calculate the shim angle:Enter your measured values for Distances A, B, and the axle gauge dimension D into the form below to compute the required shim correction angle.