Research on the method of negative acceleration flight test based on simulation

Abstract

Negative acceleration flight test is an important part of civil airplane to obtain airworthiness certification. According to civil aviation regulations, engine, APU, fuel, power supply and other systems need to be verified by flight test. In this paper, the factors affecting negative acceleration flight are evaluated by simulation method, such as gross weight (GW), center of gravity (CG), pitch attitude, calibrated airspeed, and stick travel. Relationship between flight path angle (FPA) rate and the calibrated airspeed is formed by approximate calculation. The duration of each negative acceleration flight is suggested to be a minimum of 7 seconds. In order to maximize the time to maintain the negative overload state, a more effective flight test method is proposed.