制约民用直升机工业发展的一个主要因素是其昂贵的飞行成本。与固定翼涡轮螺旋桨飞机相比较,直升机每座英里的飞行成本普遍高10倍。直升机的初期投资较大,而且需要更经常的维护和更多的零备件来保证其使用,同时还必须缴纳较高的保险费。此外,由于维修而停飞使得它的收益飞行时间减少,这就造成本来就较高的固定成本,还须由较少的生产性飞行时间来分摊的不利局面。 One of the main constraints to the development of civilian helicopter industry is its high cost of flight. Compared with fixed-wing turboprop aircraft, helicopters per mile cost of flight is generally 10 times higher. Helicopters have a high initial investment and require more frequent maintenance and more spare parts to secure their use, as well as higher premiums. In addition, the suspension of maintenance resulting in a reduction of its revenue flying time resulted in an unfavorable situation that would have been higher fixed costs and had to be spread out with less productive flying time.