風扇及助推器提供兩個隔離的氣流，主氣流通過風扇轉子內部，接著穿過助推器、發動機主體及低壓壓氣機，從排放噴嘴核心排出。次級氣流通過風扇外部從風扇排氣管道噴出。風扇安裝于發動機前端，其主要功能是給氣流加速引導氣流到發動機次級氣流噴嘴。這樣產生的動力占發動機總推力的 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.

燃油根據發動機推力的需求在壓力作用下流到燃油噴嘴。燃油在油箱中用泵抽出并流過燃油關斷活門。發動機燃油關斷活門由發動機起動手柄和發動機火警開關控制。當發動機燃油關斷活門關閉時，位于前頂置面板上的“ FUEL VALVE CLOSED”燈燃亮。

(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.

燃油從第一級發動機驅動燃油泵中通過燃油 /滑油熱交換器到一個油濾。當油濾萬一失效或堵塞時將被旁通。燃油泵的第二級提供高壓燃油給主發動機控制器。當燃油離開燃油泵第二級 ,流到另一個油濾，在那里，一部份燃油在進入主發動機控制器前前轉到一個伺服燃油加熱器。這個伺服燃油加熱器用發動機滑油加熱伺服燃油以防止控制機械內部主發動機控制器結冰。主發動機控制器與電源管理控制器相連，用動力桿角度、風扇入口壓力及溫度、 N1轉速和 N2轉速來測量燃燒室燃油量。燃油流量傳感器從主發動機控制器測量燃油流率并為燃油流量指示器提供信號。

(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.

滑油系統通過發動機驅動的滑油泵增壓。滑油離開裝有滑油壓力傳感器及“ LOW OIL PRESSURE”開關的滑油泵，流向一個滑油油濾并流到發動機軸承及齒輪箱�；�油通過發動機驅動的回油泵回到滑油箱。從回油泵返回的滑油流經一個油濾，旁通活門用來防止油濾堵塞。當滑油回到回油泵時，通過一個傳感器來感受回油滑油溫度，然后，滑油通過伺服燃油加熱器及燃油 /滑油熱交換器，在這，滑油在回到滑油箱之前被燃油冷卻。