第四章 飞机结构修理要求

STRUCTURALREPAIRREQUIREMENTS一、 ClassificationsofRepairs修理等级1、 TherearetwoclassificationsofrepairsinthisSRM:在SRM中修理分为两个等级：RepairsthathavebeenevaluatedandanalyzedfordamagetolerancecapabilityandareclassifiedasCategoryA,B,orCrepairs.已经过损伤容限评估的修理分为A,B,C类。RepairsthathavenotbeenevaluatedandanalyzedfordamagetolerancecapabilityandareclassifiedasPermanent,InterimorTime-LimitedRepairs.未经过损伤容限评估的修理分为永久，临时或限时修理。2、 Thedefinitionsofthedifferentcategoriesofdamagetolerantrepairsareasfollows:CategoryARepair:ApermanentrepairforwhichtheinspectionsgivenintheBaselineZonalInspection(BZI)aresufficientandnootheractionsarenecessary.A类修理：BZI检查充分并且不必进行其它步骤的永久性修理。CategoryBRepair:Apermanentrepairforwhichsupplementalinspectionsarenecessaryatthespecifiedthresholdandrepeatintervals.B类修理：在特定容限和重复周期中需要额外检查而进行的永久性修理。CategoryCRepair:Atime-limitedrepairwhichmustbereplacedorreworkedwithinaspecifiedtimelimit.Alsosupplementalinspectionscanbenecessaryataspecifiedthresholdandrepeatinterval.C类修理：在指定时间内必须更换或进行的限时修理。在特定容限和重复周期中也需要额外检查。3、Thedefinitionsofthedifferenttypesofrepairsthathavenotbeenevaluatedandanalyzedfordamagetoleranceareasfollows:未经过损伤容限评估的修理的定义如下：PermanentRepair:Arepairwherenoactionisnecessary,excepttheoperator’sncmairitenance.永久性修理：除了常规维修以外不需其他步骤的修理。InterimRepair:Arepairthathasthenecessarystructuralstrengthandcouldstayontheairplaneindefinitely.Therepairmustbeinspectedatspecifiedintervalsandreplacedifdeteriorationisdetectedordamageisfound.临时修理：该修理能达到必要的结构强度，但失效时间不确定。必须在指定的周期内检查并且在发生结构退化和损伤时予以更换。Time-LimitedRepair:Arepairthathasthenecessarystructuralstrengthbutdoesnothavesufficientdurability.Thisrepairmustbereplacedafteraspecifiedtime,usuallygivenasanumberofflightcycles,flighthoursoracalendartime.限时修理：该修理能达到必要的结构强度但没有足够的耐久力。必须在指定的时间（飞行次数，飞行小时或者公历日）后予以更换。4、ProcessDiagramofClassificationsofRepairs修理等级划分步骤二、 AerodynamicSmoothnessRequirements气动光滑要求1、The737airplanerequiresanaerodynamicallycleanshapeandsmoothexteriorforhighperformance.Unrepaireddamage,unfilleddentsorrepairswhichchangetheshapeorroughenthesurfacewillbereflectedinreducedperformance.Everyeffortshouldbemadetomaintainoriginalcontourandexteriorsurfacesmoothness.Exteriorsurfaceaerodynamicsmoothnessisclassifiedintwocategories:criticalandnoncritical.SeeTableI(CriticalAndNoncriticalAreas)andSeeFigure4-2(AerodynamicSmoothness-CriticalAreas)为满足其高性能，737飞机必须有洁净光滑的气动外形。任何改变飞机外形或使其表面变粗糙的未经修理的损伤，未填补的凹坑都会导致飞机性能的下降。在修理中，应最大限度地保持飞机原始轮廓和外表面光滑度。2、飞机外表面按气动光滑要求可分为关键区域和非关键区域两类。请参照TableI(气动光滑关键和非关键区域)和Figure4-2(气动光滑关键区域)CriticalAreasFuselagenosetotheframeatfuselagestation663.75WingupperandlowersurfacesfromleadingedgetorearsparcenterlineandaileronareasNacelleandpylonareasVerticalstabilizer,rightandleftsurfaces,fromleadingedgetocenterlineofrearspar,andrudder.Horizontalstabilizer,upperandlowersurfaces,fromleadingedgetocenterlineofrearspar,andelevatorNoncriticalAreasAllotherexteriorsurfacesoftheairplaneareconsideredasnoncriticalCriticalAndNoncriticalAreas气动光滑关键和非关键区域TableICRITICALAREAHIGHDECREEOFAERIOOTNAH£CES5REGUEREDAerodynamicSmoothness-CriticalAreas气动光滑关键区域Figure4-2三、 SymmetryAndIncidenceCheck对称性和安装角检查1、ThesymmetryandIncidencecheckisaprocedurethatcomparesdifferencesinmeasurementsmadeoneachsideoftheairplane.Thischeckprocedurewillaidinevaluatingstructuraldeformationsthatmayhaveoccurredontheairplane.对称性和安装角检查是比较飞机两边的相应测量数据。日的是评估可能已经发生的结构变形。2、 Symmetryandincidencechecksshouldbemadeifstructuraldeformationissuspectedafterhardlandings,severeflightmaneuvers,unsatisfactoryin-flightoperation,orafterrepairstomajorstructuralcomponents.在下列情况下应进行对称性和安装角检查：重着陆后怀疑发生结构变形，剧烈地飞行机动，不正确地飞行操纵或者飞机主要结构部件修理之后。3、 Asymmetrycheckcomparesaseriesofsymmetricalmeasurementstakenontheairplane.Eachmeasurementistakenbetweentwoselectedpointsontheleftsideoftheairplaneandcomparedtoameasurementthatisoppositeontherightsideoftheairplane.对称性检查对比飞机左右两边选定点的一系列的测量数值。4、 Anincidencecheckcomparesanglesofincidenceatcorrespondinglocationsontheleftandrightsideoftheairplanewingandhorizontalstabilizer.安装角检查检查飞机左右机翼和水平尾翼相应位置的安装角度。四、SupportOfAirplaneForRepa修理工作中的飞机支撑SeeFigure4-3forLocationofJackSupportsandSupplementarySupports.顶升和辅助支撑位置请参照Figure4-3NOTES[lfmAWILEJIRI1JftCKIMSMINTJACKETF她WHEF"65539叵FR]M#fiVJJIC^CNGP03HTLGCAT1MS袖机礼H Akpj^tKJkSSUWORT3hFC