1 Rotate the door latches so the latches are in the open position.
2 Fit the door by centering it in the fusalage opening. Maintain a uniform gap al arond between the door and the fusalage y placing temporary shims for support ( stacked tongue depressors work welll for this).
3 Trim the dor skin as require to provide a 1/8 to3/16 gap between the door and fusalage. Keep the gap as uniform as possible to ensure a good fit at final installation.
