The development of civil aviation models both domestically and internationally is rapidly advancing, and aircraft customer service products, such as manuals, ground support equipment, and flight simulators, serve as vital guidelines for aircraft maintenance, repair, and operations. Consequently, establishing an efficient and practical progress management method for aircraft customer service product validation is of significant importance during the civil aircraft development phase. This paper is based on the PDCA cycle theory and focuses on the progress management method for civil aircraft customer service product validation during the flight test phase. It constructs a progress management model from seven perspectives: man, machine, material, method, environment, measurement, and else （5M2E）, and introduces the task maturity level management method for process control. Using flight simulator flight test data collection as a case study for empirical analysis and application. The results demonstrate that by combining the 5M2E method, PDCA cycle management theory with the task maturity level management method, the progress management objectives for the entire process of aircraft customer service product validation during the flight test phase become clearer, resource allocation becomes more reasonable, and management processes become more optimized, and this provides methodological guidance to improve the efficiency and effectiveness of the validation of customer service products for other aircraft models in the future.