风扇及助推器提供两个隔离的气流，主气流通过风扇转子内部，接着穿过助推器、发动机主体及低压压气机，从排放喷嘴核心排出。次级气流通过风扇外部从风扇排气管道喷出。风扇安装于发动机前端，其主要功能是给气流加速引导气流到发动机次级气流喷嘴。这样产生的动力占发动机总推力的 78%。

(5) Fuel is delivered to the fuel nozzles at pressure and flow-rate required to obtain the desired engine thrust. Fuel is pumped from the fuel tank and enters through the engine fuel shutoff valve. The engine fuel shutoff valve is controlled by the engine start lever and the engine fire warning switch. When the engine fuel shutoff valve is closed ,the FUEL VALVE CLOSED light located on the forward overhead panel illuminates dim.

燃油根据发动机推力的需求在压力作用下流到燃油喷嘴。燃油在油箱中用泵抽出并流过燃油关断活门。发动机燃油关断活门由发动机起动手柄和发动机火警开关控制。当发动机燃油关断活门关闭时，位于前顶置面板上的“ FUEL VALVE CLOSED”灯燃亮。

(6) Fuel passes from the first stage of the engine driven fuel pump through a fuel/oil heat exchanger to a filter. Provisions are made to bypass the filter in the event of failure or blockage. The second stage of the fuel pump provides high pressure fuel to the main engine control(MEC). As the fuel leaves the second stage fuel pump, it passes through another filter where a portion of the fuel is ported to a servo fuel heater before entering the MEC. The servo fuel heater uses engine oil to heat the servo fuel to prevent icing of control mechanisms control(PMC) uses power lever angle, fan inlet pressure and temperature, N1 rpm and N2 rpm to meter the correct amount of fuel to the combustor. A fuel-flow transmitter measures the rate of fuel flow from the MEC and provide a signal to the fuel flow indicator.

燃油从第一级发动机驱动燃油泵中通过燃油 /滑油热交换器到一个油滤。当油滤万一失效或堵塞时将被旁通。燃油泵的第二级提供高压燃油给主发动机控制器。当燃油离开燃油泵第二级 ,流到另一个油滤，在那里，一部份燃油在进入主发动机控制器前前转到一个伺服燃油加热器。这个伺服燃油加热器用发动机滑油加热伺服燃油以防止控制机械内部主发动机控制器结冰。主发动机控制器与电源管理控制器相连，用动力杆角度、风扇入口压力及温度、 N1转速和 N2转速来测量燃烧室燃油量。燃油流量传感器从主发动机控制器测量燃油流率并为燃油流量指示器提供信号。

(7) The oil system is pressurized by the engine driven oil pump. The oil leaves the oil pump, where sensors for oil pressure and the LOW OIL PRESSURE switch are located, passes through an oil filter and continues to the engine bearing and gearbox, the oil is returned to the oil tank by means of engine driven scavenge pump. From the scavenge pumps the oil passes through a scavenge filter. Bypass valve is mounted to prevent filter from blocking. scavenge oil temperature is sensed as the oil returns to the scavenge pump. The oil then passes through the servo fuel heater and fuel/oil heat exchanger where it is cooled by fuel before returning to the

oil tank.

滑油系统通过发动机驱动的滑油泵增压。滑油离开装有滑油压力传感器及“ LOW OIL PRESSURE”开关的滑油泵，流向一个滑油油滤并流到发动机轴承及齿轮箱。滑油通过发动机驱动的回油泵回到滑油箱。从回油泵返回的滑油流经一个油滤，旁通活门用来防止油滤堵塞。当滑油回到回油泵时，通过一个传感器来感受回油滑油温度，然后，滑油通过伺服燃油加热器及燃油 /滑油热交换器，在这，滑油在回到滑油箱之前被燃油冷却。