在图 3-1中，我们可以看出，调节空气从右组件流向主分配管道，还有调节空气从左组件流向主分配管道和进入驾驶舱。另外，从左混合舱出来的配平空气管道增加热空气给驾驶舱管道。主分配管道通过两个侧壁竖管供气给客舱顶部分配系统。

(6) A 3-phase fan draws air from the collector shroud through filters and discharges into the main distribution manifold for redistribution.

一个三相风扇从收集器防护罩穿过过；滤器和排出口进入主分配管道，用以再分配。
LESSON 4 PRESSURIZATION INTRODUCTION增压系统简介
一、单词二、TEXT
组件  Pack 控制  Control  \座舱高度  Cabin altitude
外流阀  Outflow valve 保持  Maintain 尽可能的 …  As as possible
目的地  destination 安全的  Safe 舒适的  Comfortable
曲线  Curve 对时间的  Against time 起飞  Takeoff
巡航  Curise 虚线  Dotted line 实线  Solid line
爬升  Ascend 下降  Descent 近  Near
环境  ambient 减小  decrease 变化率  rate 

确定、决定  Determine 大气  Atmosphere 例子  Example
磅/英寸  Psi=pound per square inch 参照 …  By referring 图表  Chart
描绘  Depict 与 …的关系曲线  versus 称之为 …  Is referred to as
制度  Sytstem 水银  mercury 毫巴  Millibar
相等的  identical 施加  exert 排出  exhaust
向机舱外  outbroud

(1) the air conditioning packs supply conditioned air into pressurization system. the pressurization system controls cabin altitude by regulating air flow from the fuselage, through the outflow valve. The pressurization system maintains cabin altitude as close to sea level as possible or at an altitude equal to the altitude of the flight destination, so the pressurization system provides a safe comfortable cabin altitude for the crew and passenger at all airplane altitude.

空调组件为增压系统提供调节空气。增压系统通过调节机身气流控制客舱高度，通过外流阀，增压系统保持客舱高度尽可能的接近海平面或等于飞行目的地高度，这样增压系统可为机组和旅客在整个飞行过程中提供一个安全舒适的客舱高度。

(2) Figure 4-2 shows a curve of airplane and cabin altitude against time from take off through cruise to landing . airplane altitude is shown in dotted line. Cabin altitude is shown in solid line. The airplane starts its flight at an airport altitude near sea level, ascends, cruises, and descends to a landing airport near sea level.

图 4-2显示为飞机和坐舱高度在起飞、巡航及着陆阶段的时间曲线。飞机高度显示为虚线，坐舱高度显示为实线。飞机以接近海平面的机场高度开始飞行、爬升、巡航、下降和接近海平面的机场着陆。

(3) Cabin altitude starts at the take off altitude. As the airplane climb, the ambient pressure decreases; the higher the altitude, the lower the pressure. The altitude inside the airplane (cabin altitude)also climbs but at a lower

rate than the airplane. The pressurization system provides the pressure differential between the cabin and ambient.