航空航天术语:辅助动力单元

在地面APU能起到什么作用?APU可让飞机无需地面支持系统,如地面动力单元(GPU)外部空调、高压空气启动车等,就能自主运行。它常用于为飞机电路系统供电,保障飞机在地面时空调和增压系统运行。什么时候启动APU?飞机地面停驻时,有地面动力单元等支持,停用APU。只在即将离开机位时,才启动APU,为飞机提供压缩空气,用于启动主发动机。

What can the APU doon the ground?The APU allows the aircraft to operate autonomously without any ground support systems such as ground power unit(GPU),an external air-conditioning unit or a high pressure air start cart.It is typically used to power the aircraft's electrical systems,and provide air conditioning and pressurization for the aircraft when it is on the ground.