【原】LEAP-1A发动机防冰活门PRSOV1拆除程序解读

REFER TO AMM - R102 AMM TASK 30-21-51-000-804-A Removal of the AFT Air-Intake Anti-Ice Valve (PRSOV1) FIN:4010DN

手册原文： WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU. 释义： 警告： 发动机关车后，在发动机部件开展工作时要小心。使用合适的隔热手套。发动机部件在关车后可能会保持高温一小时，并可能灼伤您。

Reason for the Job Job Set-up Information Job Set-up 分析说明：步骤1-3没有什么特殊情况，也没有难度，按照手册执行即可。

4.Procedure

手册原文： SUBTASK 30-21-51-020-059-A CAUTION: DO NOT LOOSEN OR REMOVE THE BOLTS ATTACHED TO THE FORWARD INNER DUCT (36) AND THE ENGINE CASE WHEN YOU REMOVE/INSTALL PRSOV1. IF YOU DO NOT TIGHTEN/TORQUE THE BOLTS, THIS CAN CAUSE LEAKAGE OF HOT AIR FROM THE FORWARD INNER DUCT DURING THE ENGINE OPERATION. 释义： 注意： 拆卸/安装PRSOV1时，不要松开或拆卸连接至前内管道（36）和发动机壳体的螺栓。 如果您不拧紧/磅力矩螺栓，这可能会导致发动机运行过程中前内管道的热空气泄漏。 分析说明： （1）CAUTION要特别关注，勿动的部分勿动！ （2）上图中item36管路是直接连接到发动机壳体上的一段管路。这个管路与壳体的连接是通过4个螺栓。同时，为了支撑PRSOV1，这段管路由2个支架支撑。根据安装示意，即使拆除支撑的2个支架，此管路也不会有任何方向上的位移。如前后推拉，可能会对与机匣的安装端造成损伤。如勿动了与壳体安装的4颗螺栓，很可能造成壳体与管接头间漏气。 （3）如勿动了支架，安装螺栓的长度不一样，确认好后再装回，不然拧不到底。

手册原文： A.Removal of the Aft Air-Intake Anti-Ice Valve (aft anti-ice valve) (1) NOTE:This valve is also known as Pressure Regulating and Shut-Off Valve 1 (PRSOV1).

【拆除PRSOV1上的附件】 手册原文： (1)Disconnection of the electrical connector (2): CAUTION: USE ONLY SOFT-JAW PLIERS. METAL-JAW PLIERS CAN MAKE THE ELECTRICAL CABLE UNSERVICEABLE. (a)Use PLIERS - JAWED, SOFT to disconnect the electrical connector (2) from the aft anti-ice valve (1). POST SB LEAP-1A 72-0292 (2)Remove the bolt (6) from the clamp (7). (3)Remove the electrical harness (4) from the clamp (7). END POST SB LEAP-1A 72-0292 (4)Remove electrical harness (3) and electrical harness (4) from the spring clips (5). (5)Remove the coupling (20) between the vent hose (9) and the aft anti-ice valve (1). (6)Disconnect the vent hose (9) from the aft anti-ice valve (1). 分析说明： （1）本部分的主要目的是：断开item3和4线束的电插头并移开可能受影响施工区域。

【拆除管路上附件及活门间管路】 手册原文： (7)Remove the sense tube (12) as follows: (a)Disconnect the sense tube (12) from the air-sense tube (13). (b)Use a counter-wrench to hold the aft duct (10) port fitting. (c)Use a second WRENCH - STANDARD to disconnect the sense tube (12) from the aft duct (10) senseline port fitting and remove the sense tube (12) from the engine. (8)Remove the tube hose (11) as follows: (a)Use a counter-wrench to hold the fitting on the aft anti-ice valve (1). (b)Use a second WRENCH - STANDARD to disconnect the tube hose (11) from the fitting on the aft anti-ice valve (1). (c)Use a counter-wrench to hold the fitting on the aft duct (10). (d)Use a second WRENCH - STANDARD to disconnect the tube hose (11) from the fitting on the aft duct (10) and remove the tube hose (11) from the engine. (9)Remove the muscle tube (21) as follows: (a)Use a counter-wrench to hold the fitting on the forward anti-ice valve (17). (b)Use a second WRENCH - STANDARD to disconnect the muscle tube (21) from the forward anti-ice valve (17) fitting. (c)Use a counter-wrench to hold the fitting on the aft anti-ice valve (1). (d)Use a second WRENCH - STANDARD to disconnect the muscle tube (21) from the aft anti-ice valve (1) and remove the muscle tube (21) from the engine. (10)Remove the coupling (15) between the vent hose (9) and the vent tube (22), and remove the vent hose (9) from the engine. 分析说明： （1）本部分的主要目的是：移除4根管路。感压管item11和12；通气管item9；压力管item21。 （2）拆除管路时，两个扳手的使用要特别注意，避免管路受力。 （3）4根管路相互独立，并没有层次上的关系，虽手册按序号列出，并没有严格的先后顺序。

【脱开管路上的2个支架】 手册原文： (11)Remove the nut (14) and bolt (18) from the inboard strut (19) immediately aft of the forward anti-ice valve (17). (12)Carefully move the free end of the strut (19) away from the aft duct (10). (13)Remove the nut (33) and bolt (34) from the aft strut (35) immediately aft of the aft anti-ice valve (1). (14)Carefully move the free end of the strut (35) away from the aft duct (10). 分析说明： （1）本部分的主要内容是：脱开item10管路2个支架的管路端，并向远离管路方向移开。 （2）item10上面共4个支架连接，其中3个与发动机壳体相连，1个与其他管路相连。

【拆除PRSOV1两侧的两个卡子和管路后部的卡子】 手册原文： (15)Open and remove the V-band clamp (32) at the aft end the aft anti-ice valve (1). (16)Open and remove the V-band clamp (37) at the forward end of the aft anti-ice valve (1). (17)Loosen the V-band clamp (28) at the aft end of the forward anti-ice valve (17). If necessary, V-band clamp (28) may be fully opened and removed, but be careful not to lose or damage the E-seal within the V-band clamp (28). 分析说明： （1）本部分的主要目的是：拆除3个固定卡子，分别为item32/37/28。其中item28要求松动，按需移除。特别注意：如移除item28卡子，千万注意封严不要掉落或损坏。 （2）拆除3个卡子是必须的，由于管路之间没有柔性连接。 （3）注意卡子的位置，卡口朝向，方便安装时参考。

【取下活门】 手册原文： (18)Remove the aft anti-ice valve (1) as follows: (a)Carefully move the aft anti-ice valve (1) in the forward direction while carefully moving the aft duct (10) in the aft direction to disengage the key tab from the key slot. (b)Turn the valve clockwise (ALF) to remove it from the engine. (c)If you need more access you can remove the nut (30) and bolt (29) from the vertical strut (27) and the nut (26) and the bolt (24) from the strut (25) immediately aft of the forward anti-ice valve (17). (d)If you need more access, you can remove bolts (23) which secure spring clip bracket (16) to aft duct (10) flange. (19)Remove and discard the E-seal (31) from the aft end of the aft anti-ice valve (1). (20)Remove and discard the E-seal (38) from the duct opening that is forward of the aft anti-ice valve (1) location. (21)Install COVER - PROTECTION and CAP - PROTECTION on all the open ports, open tubes, open hoses, and connectors. 分析说明： （1）PRSOV1移除的的方法要领要细细品味。 （2）如确实拆除困难，按需移除其他接近项目。

【总结】 （1）“二四二三”：2根线束（移开位置）；4根管路（移除）；2个支架（脱开一端）；3个卡子（完全打开或移除）； （2）取下活门时，一定注意理解手册，注意方式方法； （2）手册中勿动的部分，一定别动； （3）注意移除、脱开、完全打开的含义； （4）item28卡子注意封严别脱落或损伤； 只有理解手册，按照手册施工，才能事半功倍。