WOHA33_143511A21_68_EOCOM-73-0107

Hong Kong Airlines Limited香港航空03110-01Hong Kong Airlines MEDHong Kong Airlines LimitedWO NO/工作指令号SEQ NO/序列号WOHA331435_68_21适航指令(AD) 143521TitleLP FUEL TUBE UPPER CLIP (CP4881) AND BRACKET INSPECTIONMcd&Rev/厂家工卡&修订日期标题低压燃油管卡子CP4881及支架检查A/C/飞机号/组别EO JC No./EO工卡EO JC Rev/工卡版本Workarea/工作区域Skill/工种Man Hour/工时BLNV/NEOCOM-73-0107R04动力/PowerplantAIRP01:15Baseline/依据Operator EO/营运人EOEO Rev/EO版本Work Type/工作类别Threshold/首检Interval/重复检EOCOM-HKG73-0029R03800FH800FHWritten/编写Reviewed/审核Approved/批准2015-03-262015-03-312015-04-03Accomplished完工签署Complete Date完工日期Station维修站PVGREASON & DESCRIPTION/原因及描述世界Trent700机队曾发现燃油泵和燃滑油热交换器（FOHE）之间的燃油管发 生 燃油泄漏。燃油泄漏的原因：FOHE安装座发生磨损后使FOHE的安装稳固性降低并带动燃油管，使燃油管在P型卡子处严重松动，卡子的胶皮磨损光后暴露出的金 属部分进一步磨损燃油管壁，最终造成燃油管破裂和燃油泄漏。此问题会造成燃油大量泄漏、空停和转航。世界机队曾出现多起卡子CP4881磨破燃油管造成燃油泄漏的事件。为保障飞行安全，保持发动机可靠性，颁发本EO对低压燃油管FW53576上的卡子CP4881和固定支架FW26692进行目视检查。Low-pressure (LP) fuel leaks from the LP fuel tubes between the combined LP/HP (High Pressure) Fuel Pump and the Fuel/Oil Heat Exchanger (FOHE), and FOHE to LP/HP fuel pump have occurred in-service in the Trent 700 fleet. Movement of the FOHE mounts due to wear allows the fuel tubes to move excessively within the clipping points. This has resulted in excessive wear of the rubber section of the P-Clips, and the subsequent frettage between the exposed metal band and the fuel tubes. The frettage reduces the fuel tube outer wall thickness, leading to fracture of the fuel tube and the consequent fuel leak. This may cause the leakage of significant amounts of fuel and can cause IFSD and diversion events. There has been a fuel leakage event among global fleet due to the frettage between the Clip CP4881 and the fuel tube. Therefore, in order to maintain flight safety and engine reliability, this EO is released to specifically visually inspect the upper P-clip (CP4881) on the LP fuel tube (FW53576) and the attaching bracket (FW26692). 注释：R01版改版原因与内容：EASA AD 2014-0089被EASA AD 2014-0243取代, CAAC CAD2014-A330-03被CAAC CAD2014-A330-03R1取代, 据此修改EO依据文件和EO等效执行方式。Note：Change and revise reason in this issue R01: Change EO Source Documents and alternative EO accomplishing method for EASA AD 2014-0089 is superseded by EASA AD 2014-0243 and CAAC CAD2014-A330-03 is superseded by CAAC CAD2014-A330-03R1.注释：R02版改版原因与内容：EASA AD 2014-0243被EASA AD 2014-0243R1取代, CAAC CAD2014-A330-03R1被CAAC CAD2014-A330-03R2取代, 据此修改EO依据文件和EO等效执行方式。Note：Change and revise reason in this issue R02: Change EO Source Documents and alternative EO accomplishing method for EASA AD 2014-0243 is superseded by EASA AD 2014-0243R1 and CAAC CAD2014-A330-03R1 is superseded by CAAC CAD2014-A330-03R2. 注释：R03版改版原因与内容：EASA AD 2014-0243R1被EASA AD 2014-0243R1Correction取代,据此修改EO依据文件。Note：Change and revise reason in this issue R03: Change EO Source Documents for EASA AD 2014-0243R1 is superseded by EASA AD 2014-0243R1Correction.TOOLS/工具TOOLS NECESSARY/必须工具ITEM项目P/N件号DESCRIPTION名称EQTP类型QTY数量APP适用性Conditions note互换信息及备注TOOLS IF NECESSARY/视情工具ITEM项目P/N件号DESCRIPTION名称EQTP类型QTY数量APP适用性Conditions note互换信息及备注PARTS AND MATERIAL/航材NOTE:OPERATOR MUST GET AND INSTALL THE PARTS THAT CORRESPOND TO THE RELATIVE WORKORDER NO.注释：请工作者严格按照工作指令号领取预定的航材装机PARTS AND MATERIAL NECESSARY/必须航材ITEM项目P/N件号DESCRIPTION名称EQTP类型QTY数量APP适用性Conditions note互换信息及备注PARTS AND MATERIALIF NECESSARY/视情航材ITEM项目P/N件号DESCRIPTION名称EQTP类型QTY数量APP适用性Conditions note互换信息及备注1AS43013-127RING SEALING TOROIDALAS1ALL视情2AS43013-134(33A2)RING SEALING TOROIDALAS1ALL视情3AS62424CLIPAS1ALL视情4FW26692BRACKETCLIPPING-OIL TANK TOP FLANGEAS1ALL视情5FW53576TUBEASSY FUEL-FCOC TO LINE DISCONNAS1ALL视情PARTS INFORMATION/部件信息:NOTE: The component in PN,SN form is need to do periodic maintenance. For the return repair or retrofit，the form is PN,SN of the removed component. And the PN-IN,SN-IN would be written according to new parts after finish. For the non- returns(such as weight, test)，the form is PN,SN of the on-wing maintenance component. And fill the PN-IN,SN-IN with bias after finish.注释：件号、序号栏指需要定期执行维修工作的部件。对于要求更换拆下返厂工作的部件，该栏指拆下件、序号信息。完成工作后装上件号和序号栏请填写相关装机件信息；对于在位执行工作的（如称重、测试等），该栏指在位工作部件件、序号信息，完成工作后装上件号和序号请用斜线画去。PN/件号SN/序号ATA/章节ZONE/区域FIN/代码LOCATION/装机位置TRENT772B-60/164202472420A3300003RH ENGINEPN-IN装上件号SN-IN装上序号REMOVAL REASON AND COMPONENT TASK REQUEST拆件原因及其部件工作要求TASK NOTE工作注释IMPORTANT NOTE:In the event of any discrepancies between the Chinese instruction and the English instruction, the English procedure should prevail.Record Additional Work/Findings(If Applicable) Reference No. Certificate of Release to Service (* Tick as appropriate # Different crews should perform the work on each of the systems)Certifies that the work specified, except as otherwise specified, was carried out in accordance with HKAR-145and in respect to that work, The aircraft / aircraft components are considered ready for Release to Service. HKA Approval No: AI / 135 / 706 * HNAT Approval No.: JMM 076, D3039 * HNAT Approval No.: JMM 047, D101115* HNAT Approval No.: JMM 049, D500023 * CASL Approval No: AI / 101 / 798 * TAECO Approval No.: DAI / 89 / 1295 * HAECO Approval No: DAI / 1 / 853 * SIAEC Approval No: AWI / 01 * STARCO Approval No.: JMM 039, D.200078 * SMECO Approval No: JMM 081, D.400009 * AMECO Approval No.: JMM001,D101131* Other: * Signature:_ Authorization No.:_ Date:_工卡Job card:EOCOM-73-0107TITLELP FUEL TUBE UPPER CLIP (CP4881) AND BRACKET INSPECTIONPerfInsp标题低压燃油管卡子CP4881及支架检查工作者检查者警 告：在发动机关车后进行发动机部件的维护工作必须小心烫伤。发动机部件的余热会保持将近1小时。WARNING: YOU MUST BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE IS SHUTDOWN. THE ENGINE PARTS CAN STAY HOT FOR ALMOST 1 HOUR.警 告：不戴劳保手套不能接触发动机未冷却部件，否则会造成烫伤。若发生烫伤，将烫伤部位浸在凉水中10分钟，然后寻求医疗救治。WARNING: YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE INJURY. IF YOU GET AN INJURY, PUT IT IN COLD WATER FOR 10 MINUTES. THEN GET MEDICAL AID.警 告：燃油有毒性并可被人体皮肤吸收。人体皮肤不能长时间接触燃油，若皮肤沾染燃油应及时用清水洗净。WARNING: YOU MUST NOT LET ENGINE FUEL STAY ON YOUR SKIN. FLUSH THE FUEL FROM YOUR SKIN WITH WATER. THE FUEL IS POISONOUS AND CAN BE ABSORBED INTO YOUR BODY.注 意: 为减小由于维护不当所造成的双发同时空停、失去动力或工作异常的风险，特建议工作者不要在同一时段内对同一架飞机的两台发动机进行维护工作，若上述情况无法避免，应采取相应的控制措施以保证工作者严格按照此EO的要求来完成维护工作。CAUTION: IN ORDER TO REDUCE THE POTENTIAL FOR MULTIPLE ENGINE IN-FLIGHT SHUT DOWN, POWER LOSS, OR OTHER ANOMALY DUE TO MAINTENANCE ERROR, IT IS RECOMMENDED THAT OPERATORS AVOID PERFORMING MAINTENANCE ON MULTIPLE ENGINES INSTALLED ON THE SAME AIRCRAFT AT THE SAME TIME. IF IT IS NOT POSSIBLE TO AVOID MAINTENANCE ON MORE THAN ONE ENGINE AT THE SAME TIME, IT IS RECOMMENDED THAT ADDITIONAL CONTROLS ARE APPLIED IN ORDER TO ENSURE THAT MAINTENANCE TASKS HAVE BEEN COMPLETED AS DEFINED IN THIS EO.注 意：不能让燃油溅落至发动机上，燃油会对发动机表面保护层和部分发动机部件造成损伤，若发生燃油溅落应立即用干净不起毛的布进行清洁。CAUTION: YOU MUST NOT LET ENGINE FUEL FALL ON THE ENGINE. UNWANTED FUEL MUST BE REMOVED IMMEDIATELY WITH A CLEAN LINT-FREE CLOTH. THE FUEL CAN CAUSE DAMAGE TO THE SURFACE PROTECTION AND TO SOME PARTS.施工说明概述：本EO要求检查P型卡子CP4881及其固定支架。General Instruction: Inspect the P-clip CP4881 and the bracket supporting the P-clip CP4881.(1) 接近/Get access (a) 参考AMM 71-13-00，打开风扇整流罩。Open the fan cowl doors; refer to AMM 71-13-00. (b) 在位放置合适的工作梯。Put suitable access platform into a safe position. (2) 在位目视检查卡子CP4881和卡子的固定支架。参考图1、图2和图3，卡子CP4881位于FOHE和高压燃油泵之间的上段燃油管（P/N FW53576）。Visually inspect without removing any parts, the upper most clipstack (CP4881) on the FOHE to HP fuel pump fuel pipe upper section (FW53576) and the bracket that this P-clip is attached to for damage. Refer to Fig.1, Fig.2 and Fig.3.注 意：如果旧卡子被拆下，只允许装回新卡子，不允许装回旧卡子。CAUTION: If one or more P-clips are removed then refit using only new P-clips, do not refit previously installed P-clips.(a) 参考图3a，目视检查卡子上与螺栓（P/N AS48409）相连接部分金属条是否开裂或断裂。Visually check this clip for obvious evidence that the visible metal bands through which the bolt (AS48409) is inserted are cracked or fractured. Refer to Fig.3a.(i) 如果卡子检查正常：保持卡子原状，转到后续步骤(b)。If the clip is not cracked - Do not disturb the assembly, go to the following step (b).(ii) 如果发现卡子金属条开裂或断裂：拆下卡子并按后续步骤(c)中的损伤标准检查燃油管。If the clip is cracked/fractured remove the clip and inspect the fuel tube in accordance with the following step (c).1) 如果燃油管检查超标，按AMM 70-12-01更换燃油管。If the fuel tube is found to be unserviceable, remove and replace fuel tube(s) in accordance with AMM 70-12-01.(b) 参考图3b，目视检查支架（P/N FW26692）是否存在磨损或损伤，需特别留意检查卡子CP4881的螺栓附近区域。Visually check the bracket (FW26692) for obvious evidence of wear or damage, specifically check that the P-clip (CP4881) bolt area is in good condition. Refer to Fig.3b.(i) 如果支架检查正常：保持支架原状，转到后续步骤(3)。If the bracket is not cracked - Do not disturb the assembly, go to the following step (3).(ii) 如果支架开裂或断裂：更换支架并按后续步骤(c)中的损伤标准检查燃油管。如果卡子检查正常，可以保留100FH再完成此步骤。If the bracket is cracked/fractured remove and replace the bracket and inspect the fuel tube in accordance with the following step (c). This may be carried out within the next 100 operating hours if the clip is not damaged.1) 如果燃油管检查超标，按AMM 70-12-01更换燃油管。If the fuel tube is found to be unserviceable, remove and replace fuel tube(s) in accordance with AMM 70-12-01.(c) 燃油管路检查及报废标准Fuel tube acceptance and rejection criteria: 卡子位置处的外侧管壁磨损深度超过0.2mm(0.008 in.)。Contact frettage under clip location to a depth of greater than 0.2 mm (0.008 in.).报废Reject注 释NOTE: 1. 对于在燃油管上发现的其它损伤，按AMM中的损伤标准处理（Ref to AMM TASK73-11-00-200-801）。Use AMM Limits for any other damage on the tube (Ref to AMM TASK73-11-00-200-801). 2. 特别注意检查燃油管所有外露表面，如果某些区域无法直接观察，则需要使用反光镜。Take particular care to inspect the entire exposed surface of the tube, a mirror may be used in areas where direct line of sight access is difficult.(d) 如果卡子或燃油管检查超标，不装回旧卡子，按AMM 70-12-01更换新的卡子。卡子安装信息参考图3。If a clip or fuel tube is rejected, do not refit this old clip, replace with new in accordance with AMM 70-12-01. Refer to Fig.3 for clipping point details. 螺栓AS48409的磅紧力矩为4.5 Nm (40 lbfin)。The torque value of bolt AS48409 is 4.5 Nm (40 lbfin).(e) 如果燃油管检查超标，按AMM 70-12-01进行更换。燃油管和P型夹安装信息参考图1、图2和图3。If a fuel tube is rejected, remove and replace it in accordance with AMM 70-12-01. Refer to Fig.1, Fig.2 and Fig.3 for tube and clipping point details.螺栓BLT5529的磅紧力矩为11.5 Nm (100 lbfin)。The torque value of bolt BLT5529 is 11.5 Nm (100 lbfin).螺栓AS48515的磅紧力矩为11.5 Nm (100 lbfin)。The torque value of bolt AS48515 is 11.5 Nm (100 lbfin).注 释：在拆下P型夹时需检查P型夹是否严重松脱或安装过紧，导致燃油管路位置得不到良好固定或存在过大安装应力。按需拆下周围的P型夹并尽量减小管路的安装应力。并填写反馈表格，记录发现的问题。NOTE: During removal of the clips look for any significant relaxation of strain that suggests poor alignment of the tubes and stressing of certain clipping positions. If necessary loosen adjacent clips and carefully manipulate the tube alignment to minimise any strain in the system. Make a note on the Feedback Form if alignment issues are seen.(3) 按AMM 71-13-00关闭发动机风扇整流罩。Close the fan cowl doors, refer to AMM 71-13-00.撤除工作梯。Remove the access platform.(4) 若更换了燃油管，按AMM 71-00-00, Test No.2, The Fuel and Oil Leak Test执行渗漏测试。If any fuel tube was replaced then do a fuel and oil leak test in accordance with AMM 71-00-00, Test No.2, The Fuel and Oil Leak Test(5) Fill Feedback Form填写技术文件反馈单图1 燃油管布局Fig. 1 General Fuel Tube Arrangement图2 燃油管FW53577和FW53576布局Fig. 2 Arrangement of Fuel Tubes FW53577 and FW