APU提供的引气用于：bleed air supplied by the APU is used to:

着陆技术（收油门的技术）会受到以下哪些因素影响? The landing technique (power reduction) is influenced by a number of variables including（）。

坡度超过（ ）度会导致翼尖擦地。Bank angles in excess of （） will result in a wingtip strike.

俯仰角度超过 ( )度会导致机尾擦地。Pitch angles in excess of （）will result in a tail strike.

不要过早地使用手轮来控制方向，原则上，待速度减到（ ）海里以下或正常滑行速度后再使用前轮转弯手柄脱离跑道，严禁利用余 速大速度脱离跑道。Don’t use tiller to control direction too early; principally, use the tiller to vacate from runway until speed reduced below（）knots or at normal taxi speed, it’s forbidden to vacate from runway with remaining high speed.

如果在发动机关车后，ITT 超过 （ ）℃并急速上升，应立即冷转发动机以降低 ITT。If ITT rises over （）℃ and is increasing rapidly following engine-shutdown, carry out a dry motoring immediately to reduce ITT.

低于（ ）N2稳定转速的滑行时间，可以作为 2 分钟的冷却时间。Taxi at a stable speed with （）N2 or below, this process can be counted as 2 minutes cooling time.

如需在跑道里 180°转弯掉头，地速不得大于（ ）节, 严禁利用余速转弯掉头，正常情况下应沿线滑行，如在跑道中段掉头或管制员有特殊要求时，应给转弯半径留出足够的余地，防止偏出跑道。If 180° turn need to be complete on runway, the ground speed cannot be more than （） knots, it’s forbidden to use remaining speed for normal and U turn. Under normal condition, taxi along the line. If making a U turn at intermediate runway or there is special requirement from controller, sufficient margin shall be left for the radius of turn in order to avoid runway excursion.

着陆期间，（ ）海里/小时前，将反推力减至 60% N1或更低。During landing, reverser thrust should be reduced to 60% N1 or lower before ( ) knots.

（案例分析）某天某机组重庆机场落地02R，落地后左转脱离，在滑行道C上滑行时机组执行着陆后动作着陆后检查单，请问是否正确并简述其原因？(case analysis)The flight Crew landed at 02R Chongqing airport one day, after landing, left turn and vacating, the crew completed after landing actions and after landing checklist, was this right and why?

（案例分析）某航CRJ900在进近过程中，高度30英尺，突然跑道上闯入另外一架飞机，机组决定复飞，副驾驶操纵飞机，机长立即收到襟翼8度，造成飞机突然下沉接地，副驾驶此刻加油门至复飞推力，开始增加姿态复飞，造成机尾擦地。请分析以上机组执行任务复飞动作是否正确以及可能造成擦机尾的原因。(Case analysis) During the approach of one Airline＇s CRJ900 , at 30ft，there＇s suddenly another aircraft incursion the runway, the crew decided to go-around, the copilot took control of the aircraft, and the captain immediately retracted flaps to 8, causing the aircraft suddenly sinking to touch the ground. The copilot advanced the thrust to T0/GA at this moment and started to increase the go-around attitude, causing the tail strike.
Please analyze whether the flight crews perform the go-around maneuver correctly and the reasons that might cause the tail strike.