The Assessment Method Of Aircraft Noise Airworthiness Certification When Mass Variant

China has been the world’s engine of economic development. Airlines constantly buy new aircrafts to open tourism and business routes. However, aircraft noise is becoming more and more severely, it has become one of the biggest obstacle that baffles the development of civil aviation. The noise management of the international civil aviation organization is stricter than before, large aircraft airworthiness noise level is required lower than fourth stage noise limited 18 EPNdB above at 2016. It is big test for noise certificated.According to the standard of aircraft noise airworthiness certification, an aircraft type the critical EPNL mean and 90 percent confidence interval must be calculated over the entire range of possible aircraft weights variants, and each noise level of aircraft mass is very complex. On the other hand, the customers are multiple, and their take-off or landing weight requirements differ from each other. This creates a lot of trouble for noise airworthiness certification. Linear interpolation is presented to calculate the EPNL and 90% confidence interval, the new method could reduce the cost of processing certified noise levels for a large number of weight variants。Based on appendix 16 issued by the ICAO, it analyze equivalent program in the noise certification, and the noise level model was built which could represent a given aircraft mass and engine parameters under the noise level. The bounds of EPNL and confidence interval was analyzed, according to the EPNL mean estimation, and equivalent EPNL flight test data,are linear functions of the aircraft weight, between two consecutive known weights. These results show that the values: interpolated EPNL and associated 90% confidence interval, are not significantly different than the values obtained through complete calculations. In engineering application, it could be certification reference by using linear interpolation to estimate noise level rapidly.