引气活门，气源系统内，使来自发动机或辅助动力装置的空气进人气源支管的活门。
BLEED valve, a valve in the pneumatic system for air supply from the engine or auxiliary power unit to the pneumatic manifold.
它用来储存电，用于启动以及在发动机关闭时为钟、收音机和CD播放机等辅助装置供电。
It is used to store electricity, start and provide electricity for clock, radio and CD player and other accessary devices when the engine is closed.
它还配备了辅助动力装置，它的权力的所有系统，当主发动机是关闭的。
It is also fitted with auxiliary power unit, which powers all systems, when the main engine is turned off.
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