Textron Cessna - Page 56

McCAULEYPROPELLERSYSTEMS
CONSTANTSPEEDCOMPOSITEOWNER/OPERATOR
INFORMATIONMANUAL
L.Frettingistheoccurrenceofshallow,sphericalsurfacedepressions,usuallycausedbyvibratory
(“chattering”)actionorbyapartwhichhasasmallradiusincontactunderhighloadwiththematerial.
M.Galling(orburnishing)isthebreakdown(orbuildup)ofamaterialsurfaceresultingfromexcessive
frictionbetweentwomovingparts.
NOTE:Particlesofthesoftermaterialwilltearloose(breakdown)andweldtothesurfaceofthe
hardermaterial(buildup).
N.AGougeisasmallsurfaceareawherematerialhasbeenremovedbycontactwithasharpobject.
O.Impactdamageoccurseitherin-ightoronthegroundwhenapropellerbladeorhubassemblystrikes
orisstruckbyanobject.
P .AnInclusionisthepresenceofanunspeciedmaterialthatwasintroducedintoaportionofstock
materialduringmanufacturingprocessessuchasrolling,forging,ormolding.
Q.ANickisalocalizedbreakoredgenotch,usuallywithdisplacementof(ratherthanlossof)material.
R.Pittingisseenasanumberofextremelysmall(possiblydeep)gouges,usuallywithdenededges,
causedbywearand/ordeteriorationonthesurfaceofamaterial.
S.AScoreisdeeperthanaGougeandmayshowdiscolorationfromthetemperatureproducedbyfriction
fromcontactunderpressure.
T.Ascrapeisalocalizedbreakoredgenotch,usuallywiththelossofmaterialthatistheresultofmultiple
impacts.
U.AScratchisanelongatedGouge.
V.AStainisalocalizedcolorchangenoticeablydifferentfromthesurroundingsurfacearea.Stainscan
becausedbyforeignobjectdeposits(usuallybenign)tochemicalchangesinthematerialcausedby
chemicalcontactorburn/heatdamage(notbenign).
3.DailyorPreightInspection
A.BladeVisualInspection
(1)Washthebladeswithamildsoapandwatersolutiontoremoveallresidue.RefertoPropeller
MaintenancePracticesforpropellercleaningprocedures.
(2)SurfaceDamage.
(a)Lookforsurfacedamageonbothsidesofthebladessuchasgouges,nicks,scratches,
anddelamination.
(b)Surfaceimperfectionscanalsobefeltbyrunningyourngernailalongthebladesurface.
(c)Amechanicshouldmakesureanyareaofraisedmaterialdamageiscosmeticanddoes
notextendintothecarbonberofthepropeller.RefertoT able603,PropellerNickand
ScrapeLimitsfordamagelimits.
(3)Erosion
(a)Examinethebladeforevidenceoferosion.
1
Ifbladesappeartoshowerosionextendingintotheberglassmaterial,thepropeller
shouldberemovedfromserviceandevaluatedbyanappropriatelyratedpropeller
repairfacility.
(b)Examinetheconditionofthepaintonthepropellerbladesandthespinner,ifpainted.
1
Painthelpspreventerosionofthepropellerbladesurface.RefertoPropellerBlade
DamageAssessmentandDispositionforpaintwearassessmentinformation.
2
Donotapplyexcessivepaintanddonotpaintpropellercomponentsunlessitisin
accordancewithMcCauleyinstructions.
NOTE:Excessivepaintthicknesscancausedamagetothepropellerasaresult
ofalightningstrikeandmayaffectpropellerbalance.
(4)Straightness
(a)Sightdowntheedgesofeachofthepropellerbladesforsignsofdeformation.
(5)Looseness
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