c9 nozzlethpt导向器背景验

HPTNozzleBackground/HighfrequencyofLEoxidationonCFM56-7Band-5BHPTNozzlesinChinaregionChina:34UER’ssinceJanuary2013(AverageECSN:~12,500)–PotentialformoreasfleetagesDistressisusuallynonrepairableduetoadverseeffectonbothLargeamountoffinesand/dirtcollectingoninternalairfoilwallcompromisescoolingeffectiveness(medianparticlesize~8µm)Leadstohighercostoverhaulsatshop 8HPTNozzleDistressOxidationOxidationandalongleadingLEinsert–asDirtremovedfromLEairfoilinsertremoved–compactedagainstLEinnerHPT 前缘内衬–接收时的状CFM56- HPTNozzleCoolingSmallparticlesfollowstreamlinearoundcombustorinnerlinertoHPTnozzleLEcavityandcausedustaccumulation.(AftcavityandTEslotsareimpactedbylargeparticlescausingpluggingofTEslotsandimpingementbaffle) CurrentFieldRegionalServiceBulletinsissuedforinspectionsofHPTNandS1LPTNforenginesthathaveoperatedforgreaterthan50%oftheirdeparturesinChinaDesignedtoextendtime-on-wingandreducemaintenancecost,whilemaintainingengineSB72-0637forCFM56-7B,SB72-0645forCFM56-BorescopetheHPTNbeginningat9600cyclesandtheLPTNat6400Ifthesecomponentswerereplacedwithneworusedserviceable,thenthetimeforBSIinitiationstartsoverfromtimeofcomponentreplacementIfHPTNisinspectedandinternallycleanedperrepair016atshopvisit,timeforBSIinitiationstartsExpandedAMMlimitsfortheTechInsertionHPTPublishedJune2014(BoeingAMM)/November2014(AirbusHPTNGVLEcracklength…increasedto1.0Platformmissingmaterial/burningoninner&outerband…through-holeupto0.06squareConcavesurfacemissingmaterial…missingmaterialcausedbycracksupto0.04squareLimitsaboveextendedwith400-cycle对于超过50%从中国起飞的发动机，发布了服务通告对PT导向器和第一级PT向器进行检查SB72-0637针对CFM56-7B,SB72-0645针对CFM56-对HPT导向器孔探检查的门槛值是9600循环，对LPT导向器孔探检查的门槛值是6400循新标准已发布:2014年6月(波音AMM)/2014年11月(空客HPT导向器前缘裂纹长度…1.0内外平台材料丢失/烧蚀…0.06叶盆表面材料丢失…裂纹导致的材料丢失最大到0.04HPTNozzleCFMreleasedaPtAlcoatedHPTNozzlerepairconfigurationinNov2011forthe5B/5C/7BenginemodelsRepairDocumentallowsPtAlapplicationonallrepairsRepairDocumentsCFM56-5B/-5C/-7B(3DAero)-Repair018(Task72-51-CFM56-5B/-5C(2DAero)-Repair019(Task72-51-PtAlcoatedHPTNozzleswillhaveimprovedOxidation/CorrosionResistancecomparedwithcurrentVPAcoatingDesignintenttoincreaseTOWwhereHPTNozzleLEdistressisanSimilarPtAlcoatingrepairfortheCFM56-3HPTNozzlehasdemonstratedimprovedoxidation/corrosioncapabilityPtAlcoatedsparesconfiguration(P/N2080M35G10)releasedasanalternativetoVPAin2012CFM56-5BSB72-CFM56-7BSB72-5B/5C/7BCFM56-5B/-5C/-7B3DAero)–018(Task72-51-CFM56-5B/-5C(2DAero)–019Task72-51-化/腐蚀能力的提高有铂-铝涂层的备件(2080M35G10已经在2012年发布，作为VPA涂层CFM56-5BSB72-CFM56-7BSB72-/CFMProprietaryInfor