在当前世界性裁军和缩减军费的环境下，无论是诸如美国之类工业发达的军事大国，还是像我国这样的发展中国家，其军用飞机都面临着飞机机群者龄化问题。美国空军到2000年，其飞机机群平均寿命将为20年，2015年将达30年。老龄化机群所用采的严重问题之一是飞机的维修费用迅速增 In the current context of worldwide disarmament and military spending reductions, both military aircraft, such as the developed countries like the United States and the developing countries like ours, face the problem of the aging of aircraft fleets. By the year 2000, the U.S. Air Force will have an average life expectancy of 20 years for its aircraft fleet and 30 years for 2015. One of the serious problems with the aging fleet is the rapid increase in aircraft maintenance costs