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    10/31/2009

    10月30日地面课

    燃油系统

            通常是同侧油箱供应同侧引擎。燃油是由高压油泵输入共轨系统(common rail)后直接射入气缸,而高压油泵的油来自低压油泵。共轨系统中的油压由ECU根据power setting决定。高压油泵和低压油泵均为引擎机械驱动。未射入气缸的燃油会返回油箱。

    共轨系统:为提高柴油机燃烧效率,用电子手段精确控制进入气缸的柴油供给量和供油时刻。如图

    clip_image002

    Fuel selector valves

            三个模式 On/X-feed/Off

            X-feed表示被另一个油箱feed。哪个油箱真正供油,回油就通向哪个油箱。

    左开关

    右开关

    左油箱

    右油箱

    回油

    ON

    ON

    供左引擎

    供右引擎

    同侧油箱

    ON

    X-feed

    供左右两引擎

    不供油

    回左油箱

    ON

    OFF

    供左引擎

    不供油

    回左油箱

    X-feed

    ON

    不供油

    供左右引擎

    回右油箱

    X-feed

    OFF

    不供油

    供左引擎

    回右油箱

    油箱

            每个机翼上各有一个油箱,每个油箱分成三个chambers。每侧有1USG unusable fuel,可用的油有50.8加仑

    最大可以接受5加仑的unbalance。

            飞机没有低压的booster pumps。

            油箱中有两个Vents,一个包括一个带有check valve的capillary,另一个是一个relief pressure valve。Relief pressure valve是为了在AUX fuel transfer失效的时候保护油箱,防止油压过高。带Check valve的capillary是为了连通油箱和大气,在爬升时保证油箱内外气压平衡而不会把油带出油箱。

    Hydraulic

        Brake

            刹车盘 rotor 卡钳 Caliper

            Parking brake set之后要踩几下刹车,给卡钳建立液压压力,才能保证刹车。

       Landing gear

    Hydraulically operated

    Electrically powered hydraulic pump

    Electrically actuated hydraulic valves operated by gear selector switch

    Squat switches prevent retraction on the ground

    Warning horn with ‘gear up’ and ‘1 power lever in low position ~20%’ or ‘flaps LDG’

    Gear down lock=spring loaded

    Down lock released by hydraulic pressure for retraction

    Green lights=gear down and locked

    Red light=gear neither down nor up

    Gear held up hydraulically

    Emergency operation=free fall (by releasing hydraulic pressure)

    If gear problem before landing just on final(for check ride) à Go around à safetyàchecklist

    Hydraulic fluidà Red

    Nose wheel steered with rudder pedals

    Steering angleà30°without use of breaks 52°with one wheel fully breaked

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