我国目前引进的大中型客机多数情况下都在7000～10000米高空中飞行,此高度的空气相当稀薄,大气温度都在0℃以下。为了满足旅客和飞行人员在这种环境下的旅途舒适,飞机上都安装了可靠的、既能进行座舱压力控制,又能进行温度调节的空调 At present, China’s large and medium-sized passenger aircraft are mostly flying in the altitude of 7,000 to 10,000 meters, the air at this height is quite thin and the air temperature is below 0 ° C. In order to satisfy travelers and pilots comfort in this environment, airplanes are equipped with reliable air-conditioning which is both capable of cockpit pressure control and temperature regulation