c9 nozzlethpt導向器背景驗

HPTNozzleBackground/HighfrequencyofLEoxidationonCFM56-7Band-5BHPTNozzlesinChinaregionChina:34UER’ssinceJanuary2013(AverageECSN:~12,500)–PotentialformoreasfleetagesDistressisusuallynonrepairableduetoadverseeffectonbothLargeamountoffinesand/dirtcollectingoninternalairfoilwallcompromisescoolingeffectiveness(medianparticlesize~8μm)Leadstohighercostoverhaulsatshop 8HPTNozzleDistressOxidationOxidationandalongleadingLEinsert–asDirtremovedfromLEairfoilinsertremoved–compactedagainstLEinnerHPT 前緣內(nèi)襯–接收時的狀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對于超過50%從中國起飛的發(fā)動機，發(fā)布了服務通告對PT導向器和第一級PT向器進行檢查SB72-0637針對CFM56-7B,SB72-0645針對CFM56-對HPT導向器孔探檢查的門檻值是9600循環(huán)，對LPT導向器孔探檢查的門檻值是6400循新標準已發(fā)布:2014年6月(波音AMM)/2014年11月(空客HPT導向器前緣裂紋長度…1.0內(nèi)外平臺材料丟失/燒蝕…0.06葉盆表面材料丟失…裂紋導致的材料丟失最大到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/腐蝕能力的提高有鉑-鋁涂層的備件(2080M35G10已經(jīng)在2012年發(fā)布，作為VPA涂層CFM56-5BSB72-CFM56-7BSB72-/CFMProprietaryInfor