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HARTZELL PROPELLER INC.
SERVICE LETTERTransmittal Sheet
HC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
September 16, 2020
This page transmits a revision to Service Letter HC-SL-61-277. • OriginalIssue,datedNov05/08 • Revision1,datedAug06/09 • Revision2,datedOct01/15 • Revision3,datedJan08/16 • Revision4,datedOct03/16 • Revision5,datedFeb01/17 • Revision6,datedSep16/20
Changesareshownbyachangebarintheleftmarginoftherevisedpages.
Revision6isissuedtochangethefollowingintheServiceLetter: - RevisedtheinstallationinstructionsintheAccomplishmentInstructionssection
(S-1-90governormodelsaresuppliedwithaB-3873-7bolttoconnectthecontrolcabletothegovernorcontrolarm).
ThisServiceLetterisreissuedinitsentirety.
HARTZELL PROPELLER INC.
SERVICE LETTERTransmittal Sheet
HC-SL-61-277
(Thispageisintentionallyblank.)
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page1of16
Nov 05/08Revision 6, dated Sep 16/20
1. PlanningInformationA. Effectivity
(1) AllHartzellPropellerInc.governorsareaffectedbythisServiceLetter.
wARNINg: dONOTuSEOBSOLETEOROuTdATEdINFORmATION.PERFORmALLINSPECTIONSORwORkINACCORdANCEwITHTHEmOSTRECENTREvISIONOFTHISSERvICELETTER.INFORmATIONCONTAINEdINTHISSERvICELETTERmAyBESIgNIFICANTLyCHANgEdFROmEARLIERREvISIONS.FAILuRETOCOmPLywITHTHISSERvICELETTERORTHEuSEOFOBSOLETEINFORmATIONmAyCREATEANuNSAFECONdITIONTHATmAyRESuLTINdEATH,SERIOuSBOdILyINJuRy,ANd/ORSuBSTANTIALPROPERTydAmAgE.REFERTOTHESERvICELETTERINdExFORTHEmOSTRECENTREvISIONLEvELOFTHISSERvICELETTER.
B. ConcurrentRequirements(1) Additionalservicedocumentsmayapplytothecomponents/propellers
affectedbythisServiceLetter.CompliancewithadditionalservicedocumentsmaybenecessaryinconjunctionwiththecompletionoftheAccomplishmentInstructionsinthisServiceLetter.RefertotheHartzellPropellerInc.websiteatwww.hartzellprop.comforacross-referenceofservicedocuments.
C. Reason(1) ThisServiceLetterprovidesinstallationinformationforgovernorsmanufactured
byHartzellPropellerInc.d. description
(1) ThisServiceLetterprovidesAdditionalmaintenanceInformation(AmI).(2) ThisServiceLetterprovidesgeneralinstallationinstructionsforHartzell
PropellerInc.governorsifairframemanualsorotherinstallationinformationisnotavailable.
(3) Theseinstructionsmaybeusedinconjunctionwithinstallationinformationsuppliedbytheairframemanufacturer,orusedasgeneralinstallationguidelineswhengovernorinstallationinformationisnotprovidedbytheairframemanufacturer.
(4) InformationprovidedbytheairframeorenginemanufacturersupersedesinformationprovidedinthisServiceLetter.
©2008,2009,2015,2016,2017, 2020-HartzellPropellerInc.-Allrightsreserved
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page2of16
E. Compliance(1) CompliancewiththisServiceLetterisoptional.
F. Approval(1) ThistechnicaldocumentisapprovedbyHartzellPropellerInc.
g.manpower(1) manpowerwillbevariable,dependinguponthelocationofthegovernorpadon
theengine,cowlingremoval,linkageconnections,etc.H. weightandBalance
(1) governorweightwillvarydependingupondesign.Ifnecessary,weighthegovernorbeforeinstallation.
CAuTION: dONOTuSEOBSOLETEOROuTdATEdINFORmATION.PERFORmALLINSPECTIONSORwORkINACCORdANCEwITHTHEmOSTRECENTREvISIONOFAdOCumENT.
I. References(1) Pilot'sOperatingHandbook(POH).(2) HartzellPropellerInc.StandardPracticesmanual202A(61-01-02)-
(volume7,ConsumablematerialsandPackagingandStorageisavailable ontheHartzellPropellerInc.websiteatwww.hartzellprop.com)
2. materialInformationA. materialNecessaryforEachPropeller/Component
PartNumber description usedonB-1104-1 gasket,governor HartzellPropellerInc.A-1series
governorsonlyB-1104 gasket,governor AllotherHartzellPropellerInc.
governors
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page3of16
Nov 05/08Revision 6, dated Sep 16/20
B. ConsumablematerialsCmNumber description QtyCm23 StoddardSolvent ARCm11 AcetoneordenaturedAlcohol ARCm116 Threadlocker,Removable ARCm288 methylEthylketone(mEk) ARCm219 methylPropylketone(mPk) AR - dowCorning®7ReleaseCompound AR
NOTE: AllCmnumbersormaterialsinthisServiceLetterrefertotheConsumablematerialschapterofHartzellPropellerInc.StandardPracticesmanual202A(61-01-02).
Governor GasketFigure 1
Screen Raisedscreentowardgovernor
TPI-m
B-0148
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page4of16
3. AccomplishmentInstructionsA. Installation
wARNINg: duRINggOvERNORINSTALLATION,AIRFRAmEANdENgINEmANuFACTuRER’SmANuALSANdPROCEduRESmuSTBEFOLLOwEd,BECAuSETHEymAyCONTAININSTRuCTIONSvITALTOAIRCRAFTSAFETyTHATARENOTCONTAINEdINTHISSERvICELETTER.
CAuTION: APPLICATIONOFRELEASECOmPOuNdPERmITSEASIERREmOvALOFTHEgASkETwHENTHEgOvERNORISREmOvEd,BuTCANCONTRIBuTETOLEAkINgATTHEgASkET.uSERELEASECOmPOuNdSPARINgLy.
(1) Ifdesired,applyacoatingofdowCorning®7releasecompoundorequivalenttothenewmountinggasket.
(2) makesurethatthecorrectstudsareinstalledontheenginegovernormountingpadinaccordancewiththeengineorairframemanual.(a) Thestudsmustbeofsufficientlengthtopermitatleastonethreadtobe
visibleaboveeachmountingnutafterthegovernorisinstalled.(b) Replacementofthegovernormountingsstudsmayberequiredifthe
governormountingstudsdonotextendsufficientlythroughthegovernorattachmentnutwheninstallingaHartzellgovernor.1 LycomingP/N31C-16mountingstudisoneexampleofalonger
mountingstud.(3) usingasolventlistedinParagraph2.B.,cleantheenginegovernormounting
pad,thegovernormountingsurface,andthestuds.(4) withtheraisedscreenonthemountinggasketfacingthegovernor,putthe
mountinggasketoverthestudsontheenginegovernormountingpad. RefertoFigure1.
(5) Putthegovernoronthemountingstuds.(a) Ifnecessary,rotatethegovernordriveshaftortheenginecrankshaftto
alignthesplinesonthegovernorshaftwiththeenginedrivegear.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page5of16
Nov 05/08Revision 6, dated Sep 16/20
CAuTION1: uSEAdEQuATEPRECAuTIONSTOPROTECTTHEgOvERNORASSEmBLyFROmdAmAgEwHENITISINSTALLEdONTHEAIRCRAFTENgINE.dONOTgOugEORPuTPRESSuREAgAINSTTHEgOvERNORBOdywHENINSTALLINgORREmOvINgTHENuTS.
CAuTION2: FORE,u,v,ANdSSERIESgOvERNORS,uSECAuTIONwHENuSINgANOPENENdwRENCHTOTIgHTENTHEmOuNTINgNuTS.THEwRENCHCANgETCAugHTBETwEENTHEmOuNTINgNuTANdgOvERNORBOdywALL,CAuSINgTHEwALLOFTHEgOvERNORBOdyTOCRACkANdLEAk.
(6) Installthecorrectwashersandnutsonthemountingstudsinaccordancewiththeengineorairframemanual.
(7) Torquethenutsto18-20ft-lbs(24.5-27.1N•m)unlessotherwiseindicatedintheengineorairframemanual.
(8) Connectthepropellerpush/pullcontrolcabletothegovernorcontrolarm (S-1-90governors:usethesuppliedB-3873-7bolttoconnectthecontrolcable).(a) Agovernorcontrolarmmayhavemorethanoneholeforconnectingthe
push/pullcontrol.usetheholespecifiedintheairframemanual.Ifnoholeisspecified,usetheholethatpermitsthecontrolarmtomovethroughoutthefullrangeofmovementwiththeleastrestriction.
B. OperationalChecks-groundOperation(1) variableRPmgovernors
(a) Cyclethepropellercontrolthroughoutitsoperatingrangefromlowtohigh,orasdirectedbythePilot'sOperatingHandbook(POH).
(b) Repeatthestepinparagraph3.B.(1)(a)atleastthreetimestopurgeairfromthepropellerhydraulicsystemandtointroducewarmedoiltothecylinder.
NOTE: Pitchchangeresponseonthefirstoperationfromlowtohighbladepitchmaybeslow,butshouldspeeduponthesecondandthirdcycles.
(c) makesureofcorrectoperationfromlowpitchtohighpitchandthroughoutthe operating range.
(d) PerformthestaticRPmcheckinaccordancewiththeapplicablePropellerOwner'smanual.
(e) ShutdowntheengineinaccordancewiththePOH.(f) makeadjustmentsasnecessaryinaccordancewiththePOH.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page6of16
B-3808-5 LockNut
B-6330 Beveledwasher
RPM Adjustment Components for Fixed RPM GovernorsFigure 2
TPI-m
B-0118
maximumRPmAdjustmentScrew
103669 Sealwasher
OrienttheB-6330beveledwasherwiththebeveledsidetowardthe103669sealwasher.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page7of16
Nov 05/08Revision 6, dated Sep 16/20
(2) FixedRPmgovernors(a) PerformthestaticRPmcheckinaccordancewiththeapplicablePropeller
Owner'smanual.1 IfRPmadjustmentofthegovernorisnecessary,shutdownthe
engineinaccordancewiththePOHandadjustthemaximumRPmadjustmentscrewonthegovernor.RefertoFigure2.a LoosentheB-3808-5locknutonthemaximumRPm
adjustmentscrew.b TurnthemaximumRPmadjustmentscrewclockwise
toincreaseengineRPm,counter-clockwisetodecrease engineRPm.
NOTE: OnequarterturnofthemaximumRPm adjustmentscrewwillchangeenginespeedapproximately30RPm.
CAuTION: OvERTIgHTENINgTHEB-3808-5LOCkNuTmAy dAmAgETHE103669SEALwASHER,RESuLTINg INANOILLEAk.
c TorquetheB-3808-5locknutto96-132In-Lb (10.9-14.9N•m).RefertoFigure2.
(b) PerformthestaticRPmcheckinaccordancewiththeapplicablePropellerOwner'smanual.
(c) ShutdowntheengineinaccordancewiththePOH.(d) makeadjustmentsasnecessaryinaccordancewiththePOH.(e) ExaminethegovernorforoilleakingatthemaximumRPmadjustment
screw.RefertoFigure2.1 Ifanoilleakisdetected,checktheB-3808-5locknutfor
propertorque.2 Iftheoilleakcontinues,replacethe103669sealwasher.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page8of16
Maximum RPM Adjust Screw/Lock Nut Locations (Variable RPM Governors Only)Figure 3
maximumRPmAdjustmentScrew/LockNut
maximumRPmAdjustmentScrew/LockNut
maximumRPmAdjustmentScrew/LockNut
control_arms.ai
maximumRPmAdjustment Screw/LockNut (Screwheadorientation isoptional)
maximumRPmAdjustmentScrew/LockNut maximumRPm
AdjustmentScrew/LockNut
RPmStop
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page9of16
Nov 05/08Revision 6, dated Sep 16/20
C. OperationalChecks-In-Flight(1) variableRPmgovernors
CAuTION: dONOTPERmITTHEPROPELLERTOOvERSPEEdduRINgTHESEOPERATIONALCHECkS.SIgNIFICANTdAmAgETOTHEENgINEANd/ORPROPELLERmAyRESuLT.
(a) makearecordofthemaximumpropellerRPmduringtakeoffacceleration.(b) Climbtoasafealtitudeandlevelouttheaircraft.(c) LeavethepropellercontrolinthemaximumRPmposition.(d) monitorthepropellerRPmfor3to5minutes.
1 IfthepropellerexceedsthemaximumRPm:a usingthepropellercontrollever,reducethepropellerRPmto
achievethedesiredmaximumRPm.b Leavethepropellercontrolinthenewlyadjustedmaximum
RPmposition.c Landtheaircraftandshutdowntheengine.d Removetheaircraftcowlingtoaccessthegovernor.e AdjustthemaximumRPmscrewsothatthescrewjusttouches
thegovernorcontrolarmstop.RefertoFigure3.f Torquethelocknutto30-36In-Lb(3.4-4.0N•m). g Performanin-flightchecktoconfirmthecorrectsettings.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page10of16
2 IfthepropellerRPmisbelowmaximumRPm:a makearecordofthemaximumpropellerRPmandlandthe
aircraft.b Removetheaircraftcowlingtoaccessthegovernor.c TurnthemaximumRPmscrewcounter-clockwisetoincrease
RPmorclockwisetodecreaseRPmasdesired. RefertoFigure3.(1) TurnthemaximumRPmscrew3to4turns
counter-clockwisetoincreasethemaximumRPmapproximately100RPm.
(2) TurnthemaximumRPmscrew3to4turnsclockwisetodecreasethemaximumRPmapproximately100RPm.
d Torquethelocknutto30-36In-Lb(3.4-4.0N•m).e determinemaximumRPmchangerelativetotheadjustmentof
themaximumRPmscrew.f Performanin-flightchecktoconfirmifthecorrectmaximum
RPmhasbeenobtained.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page11of16
Nov 05/08Revision 6, dated Sep 16/20
(2) FixedRPmgovernors
CAuTION: dONOTPERmITTHEPROPELLERTOOvERSPEEdduRINgTHESEOPERATIONALCHECkS.SIgNIFICANTdAmAgETOTHEENgINEANd/ORPROPELLERmAyRESuLT.
(a) makearecordofthemaximumpropellerRPmduringtakeoffacceleration.(b) Climbtoasafealtitudeandlevelouttheaircraft.(c) monitorthepropellerRPmfor3to5minutes.(d) IfRPmadjustmentisnecessary:
1 Landtheaircraftandshutdowntheengineinaccordancewith thePOH.
2 LoosentheB-3808-5 locknutonthemaximumRPm adjustmentscrew.RefertoFigure2.
3 TurnthemaximumRPmadjustmentscrewclockwise toincreaseengineRPm,counter-clockwisetodecrease engineRPm.RefertoFigure2.
NOTE: OnequarterturnofthemaximumRPmadjustmentscrewwillchangeenginespeedapproximately30RPm.
CAuTION: OvERTIgHTENINgTHEB-3808-5LOCkNuTmAydAmAgETHE103669SEALwASHER,RESuLTINg INANOILLEAk.
4 TorquetheB-3808-5locknutto96-132In-Lb(10.9-14.9N•m). RefertoFigure2.
(e) determinethemaximumRPmchangerelativetotheadjustmentofthemaximumRPmadjustmentscrew.
(f) Performanin-flightchecktoverifyproperadjustmentofthe maximumRPm.
(g) ExaminethegovernorforoilleakingatthemaximumRPmadjustmentscrew.RefertoFigure2.1 Ifanoilleakisdetected,checktheB-3808-5locknutfor
propertorque.2 Iftheoilleakcontinues,replacethe103669sealwasher.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page12of16
LockNut
Washer
CapHeadScrew
ControlLever
RPmStop
ReturnSpring
governorHead
Control Lever AdjustmentFigure 4
ControlShaft
TPI-m
B-0147
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page13of16
Nov 05/08Revision 6, dated Sep 16/20
d. ControlLeverAdjustment(1) S-1andS-4SeriesgovernorswithTopmountedControlLevers
(a) CoarseAdjustmentoftheControlLever-RefertoFigure41 Removethelocknutandwasher.
CAuTION: dONOTREmOvETHERPmSTOPORTHERETuRNSPRINg.IFTHERPmSTOPORTHERETuRNSPRINgAREREmOvEd,THEgOvERNORmuSTBERETuRNEdTOHARTzELLPROPELLERINC.ORASERvICEFACILITyAuTHORIzEdTOREPAIRmECHANICALLyACTuATEdgOvERNORSTOvERIFyTHERPmSETTINg.
2 Removethecontrolleverfromthecontrolshaft.3 Installthecontrolleveronthecontrolshaftinthedesiredposition.
a Thecontrollevercanbeturnedoverforanadditional 15degreesofcoarseadjustment.
4 Installthewasherandthelocknut.a Torquethelocknutto72-96In-Lbs(8.2-10.8N•m).
(b) FineAdjustmentoftheControlLever-RefertoFigure41 ForgovernorswithoutSafetywireontheCapHeadScrews:
a Loosen,butdonotremovethesixcapheadscrewsthatattachthegovernorhead.
b Rotatethegovernorheaduntilthecontrolleverisatthe desiredangle.
c Removeonecapheadscrewfromthegovernorhead.d Cleanthecapheadscrewtoremoveanydriedlocking
compound.e ApplythreadlockingadhesiveCm116tothethreadsofthecap
headscrew.f Installthecapheadscrewintothegovernorhead.g Torquethecapheadscrewto21-25In-Lbs(2.4-2.8N•m).h Repeatsteps3.d.(1)(b)1 cthrough3.d.(1)(b)1 gforthefive
remainingcapheadscrews.
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page14of16
(c) ForgovernorswithSafetywireontheCapHeadScrews:1 Removethesafetywirefromthesixcapheadscrewsthatattachthe
governorhead.2 Loosen,butdonotremovethesixcapheadscrews.3 Rotatethegovernorheaduntilthecontrolleverisatthe
desiredangle.4 Torquethesixcapheadscrewsto21-25In-Lbs(2.4-2.8N•m).5 Safetywirethesixcapheadscrewsinaccordancewith
NASm33540.
Maximum RPM Adjustment Screw Head OrientationFigure 5
Notch
LockNut
maximumRPmAdjustmentScrew
Height"A"
maximumRPmAdjustmentScrew
TPI-m
B-0199
mountingPost
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
HC-SL-61-277Page15of16
Nov 05/08Revision 6, dated Sep 16/20
E. maximumRPmAdjustmentScrewHeadOrientation(1) variableRPmS-1SeriesgovernorsOnly
NOTE: maximumRPmadjustmentscrewsthatdonothaveaslotinthethreadedportionofthescrewcanbeinstalledwiththeheadon eithersideofthemountingpost.RefertoFigure5.
(a) measuretheheight"A"ofthemaximumRPmadjustmentscrewthattouchestheRPmstop.RefertoFigure5.1 makearecordoftheheightmeasurement.
(b) RemovethelocknutandthemaximumRPmadjustmentscrew.(c) InstallthemaximumRPmadjustmentscrewheadinthedesired
orientationtotheheightrecordedinstep3.E.(1)(a).(d) InstallthelocknutontheoppositesideofthemaximumRPmadjustment
screwhead.1 Torquethelocknutto30-36In-Lbs(3.4-4.0N•m).
F. ContactInformationHartzellPropellerInc.Attn.:HartzellPropellerInc.ProductSupportOnePropellerPlacePiqua,Ohio45356-2634uSAPhone:(001)937.778.4379Fax:(001)937.778.4215E-mail:techsupport@hartzellprop.com
HARTZELL PROPELLER INC.
SERVICE LETTERHC-SL-61-277
Governor - Installation of Hartzell Propeller Inc. Governors
Nov 05/08Revision 6, dated Sep 16/20
HC-SL-61-277Page16of16
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