起落架收放系统是起落架的重要组成部分。现代飞机的起落架通常是可收放的。现代飞机为了减小飞机飞行时的空气阻力,多采用前三点式起落架布局。前三点式飞机的主起落架与前起落架一般收起方式不同,主起落架有沿翼展方向收起和沿翼弦方向收起两种基本形式,而前起落架一般沿机身纵向收起。 Landing gear retractable landing gear system is an important part. The landing gear of modern aircraft is usually retractable. Modern aircraft in order to reduce the air resistance of the aircraft flight, the use of the first three-point landing gear layout. The main landing gear of the three-point aircraft differs from that of the nose gear in general. The main landing gear has two basic forms, which are retracted in the span direction and retracted in the chord direction, while the nose gear is generally retracted longitudinally along the fuselage .