Abstract
The leveling and measurement of the aircraft is performed after the final assembly is completed. Measurements are used to check the accuracy of the geometric relationships within and between the various components of the aircraft and checks whether the aircraft assembly meets the overall design requirements. It is performed on the datum marks of the level measurement. During the leveling and measurement of a certain type of aircraft, the horizontal tail cathedral angles, and the engine installation angles of many aircraft have been found to have different degrees of deviation. These deviations have impact on aerodynamic characteristics, stability performance, and on-site production schedule of the aircraft. This paper has carried out special research on this deviation of the horizontal tail cathedral angles and the engine installation angles, by using empirical formulas and other methods to evaluate the deviation of the leveling and measurement, to provide a basis for the deviation evaluation of the leveling and measurement, improve the evaluation efficiency, and ensure the aircraft mass production. In addition, this paper also summarizes the root causes of the deviation, and provides an improvement direction for the aircraft’s configuration control, fuel consumption reduction and carbon dioxide emission reduction.
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