# CFM International Service Bulletin 72-1129: Revision 2

- Rights: © CFM International. Filed by the FAA in regulations.gov docket FAA-2013-0407, the docket of AD 2013-26-01. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [CFM International Service Bulletin 72-1129](https://openairdocs.org/service-documents/cfm/sb-72-1129.md)
- Title as filed: U.S. DOT/FAA - CFM56-3 SB72-1129_3
- Pages: 46
- PDF: https://openairdocs.org/files/sha256/cd/d6/cdd634aba8a76d11562b3abb6bc29718fe7878e3635b85d1d2f2b45130e8c36b
- Page: https://openairdocs.org/service-documents/cfm/sb-72-1129/file/cdd634aba8a7

## Text

Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N.

### Page 1

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
CFM PROPRIETARY INFORMATION
TheinformationcontainedinthisdocumentisCFMproprietaryinformationandisdisclosedin
con/g191dence. ItisthepropertyofCFMandshallnotbeused,disclosedtoothersorreproduced
withouttheexpresswrittenconsentofCFM,including,butwithoutlimitation,itisnottobeusedin
thecreation,manufactur e,development,orderivationofany repairs,modi/g191cations,spareparts,
design,orcon/g191gurationchangesortoobtainFAAoranyothergovernmentorregulatoryapproval
todoso. Ifconsentisgivenforreproductioninwholeorinpart,thisnoticeandthenoticeset
forthoneachpageofthisdocumentshallappearinanysuchreproductioninwholeorinpart.
TheinformationcontainedinthisdocumentmayalsobecontrolledbyU.S.exportcontrollaws.
Unauthorizedexportorre-exportisprohibited.
Alltechnicaldocumentationandinformation containedherein,withrespecttoassemblyand
disassembly,cleaning,inspectionmethodsandlimit s,repairmethodsandlimits,operational
limits,lifelimitsandthelike,havebeendevelopedandapprovedforusewithenginesandparts
thathavebeenmanufacturedand/orapprovedbyCFMandthathavebeenmaintainedin
accordancewithCFMtechnicaldocumentationandrecommendations. CFMhasnocontractual
orlegalobligationfor,norknowledgeof,non-CFM-approvedpartsandrepairs. Accordingly,this
documentisnotintendedtoapplytonon-CFM-approvedpartsandrepairs.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 1 of 46

### Page 2

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
1. PLANNINGINFORMATION
A. Effectivity
CFM56-3,-3B,-3C
(1) TheoldAccessoryGearboxassembly(AGB)335-300-110-0anditsoldcomponents
(Refertoparagraph2.C.C ONFIGURATIONCHART)installedonCFM56-3engines
orstockedassparesareaffected.
(2) ThenewAccessoryGearboxassembly335-300-112-0anditsnewcomponents
(Refertoparagraph2.C.C ONFIGURATIONCHART)willbeintroducedasspare
parts.
NOTE: ThereisnoCFM56-3engineinproductionlineanymore.
B. Description
ThisServiceBulletinannouncesthesparepartsavailabilityofthefollowing:
-AnewAccessoryGearboxassembly335-300-112-0equippedwithanewhandcranking
lineoilsealassy335-317-805-0,anewhandcrankingcoverassy335-322-806-0andanew
starterdrivepadassy335-300-807-0. Referto/g191gure1,/g191gure2and/g191gure3.
-Forthedetailsofnewstarterdrivepadassy335-300-807-0,refertoparagraph2.C.
CONFIGURATIONCHARTand/g191gure4.
ThisServiceBulletinprovidesalsotheaccomplis hmentinstructionstoreworkandreidentify
theoldAGB335-300-110-0tothenewAGB335-300-112-0.
C. Compliance
Category3
Doatnextengineshop visitopportunity.
NOTE: ThisServiceBulletincanbeaccomplishedinshop.
D. ConcurrentRequirements
None.
E. Reason
(1) Objective:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 2

### Page 3

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
INTRODUCTIONOFNEWPARTS.
Toimprovethereliability.
(2) Condition:
SomecasesofengineoillosshavebeenreportedandresultedinIFSD(InFlight
ShutDown).
(3) Cause:
GroundinvestigationsshowedthattheAGBhandcrankingcoverassywasnot
installedorincorrectlyinstalled.
(4) Improvement:
Modi/g191cationoftheAGBbytheintroductionofanewoilsealassyonthenewstarter
drivepadassyandanewhandcrankingcoverassytopreventoilleakagefrom
handcrankingpad.
(5) Substantiation:
Substantiationisbytestingandcomparativeanalysis.
F. Approval
ThetechnicalcontentofthisdocumentisapprovedbytheFAAandundertheauthorityof
DOAn°EASA.21J.086.
G. Manpower
Youwillneedapproximately4man-hourstoreplacetheoldstarterdrivepadassybythe
newoneontheAGB.
H. WeightandBalance
Accomplishment of this Service Bulletin will result in a weight increase of
0.227lb(0,103kg).
I. References
CFM56-3 Illustrated Parts Catalog, CFMI-TP.PC.8
CFM56-3 Engine Shop Manual, CFMI-TP.SM.5
CFM56 Standard Practices Manual, CFMI-TP.SP.2
CFM56 Consumable Products Manual, CFMI-TP.CP.3
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 3

### Page 4

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
CFM56 Illustrated Tool and Equipment Manual, CFMI-TP.TE.10
CFM56-3 S/B 72-0155 ENGINE - Accessory Gearbox - Deletion of
the Sealol Seal Assy Installed on the Handcranking Bearing Housing
BOEING737-300/400/500AircraftMaintenanceManual
NOTE: Thereferencedocumentslistedbelowarefortheenginemanufacturer'sinternal
useonly:
AAS : 27828 CAD: MOD095001
AAS : 27160 CAD: MOD051442
J. PublicationsAffected
CFM56-3IllustratedPartsCatalog,CFMI-TP.PC.8,ATA72-63-00
CFM56-3EngineShopManual,CFMI-TP.SM.5,ATA72-63-00
CFM56IllustratedToolandEquipmentManual,CFMI-TP.TE.10
BOEING737-300/400/500AircraftMaintenanceManual
K. Interchangeability
ThephysicalinterchangeabilityoftheAGBa ssemblyisaffectedbytheintroductionofa
newstarterdrivepadassywithanewoilsealassy. Thefunctionalinterchangeabilityof
theAGBassemblyisnotaffected.
Thenewstarterdrivepadassywithanewoi lsealassyisinterchangeableonlyasaset
withtheoldstarterdrivepadassy.
Thenewhandcrankingcoverassyisnotinterchangeablewiththeoldone.
Theoldandnewpartscannotbemixed.
L. SoftwareAccomplishmentSummary
None.
2. MATERIALINFORMATION
A. Material-PriceandAvailability
(1) Partsnecessarytodo thisServiceBulletin:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 4

### Page 5

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
PartNumber
Qty/
Eng PartName
Unit
$Price
Pkg
Qty
Lead
Time
Days
333-089-185-000 (1) LogisticKit 10,170.00 (1) Quote
.335-300-807-0 (1) Pad Assy- Starter
Drive
6,600.00 (1) 7
.335-322-806-0 (1) Cover Assy-
Handcranking
1,250.00 (1) 7
.335-317-805-0 (1) SealAssy-Oil 2,320.00 (1) 30
649-393-163-0 (1) Preformed Packing
O-Ring
16.75 (10) 30
J221P163 (Alt) Preformed Packing
O-Ring
14.00 (10) 7
649-393-158-0 (1) Preformed Packing
O-Ring
12.25 (25) 30
J221P158 (Alt) Preformed Packing
O-Ring
7.00 (25) 5
649-393-153-0 (1) Preformed Packing
O-Ring
- (-) -
J221P153 (Alt) Preformed Packing
O-Ring
5.00 (25) 10
J626P03 (3) Nut-SelfLocking 3.10 (25) 10
649-310-003-0 (Alt) Nut-SelfLocking - (-) -
649-341-010-0 (3) Washer-Plate 3.80 (50) 7
649-393-032-0 (1) Preformed Packing
O-Ring
- (-) -
J221P032 (Alt) Preformed Packing
O-Ring
2.25 (25) 10
649-393-013-0 (2) Preformed Packing
O-Ring
0.65 (100) 30
J221P013 (Alt) Preformed Packing
O-Ring
0.57 (25) 10
649-393-114-0 (1) Preformed Packing
O-Ring
- (-) -
J221P114 (Alt) Preformed Packing
O-Ring
0.65 (100) 5
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 5

### Page 6

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
NOTE1: Pricescanchange.
NOTE2: Thiskit333-089-185-000isaddedonlytofacilitatethespareparts
orderingprocess,buteachpar tcanbealsopurchasedseparately.
(2) OtherSpareParts:
PartNumber
Qty/
Eng PartName
Unit
$Price
Pkg
Qty
Lead
Time
Days
335-300-112-0 (1) Gearbox Assy -
Accessory
Quote (-) Quote
NOTE: Pricescanchange.
(3) Consumables:
CodeNumber Description
CP1039 Acetone
CP2101 GraphiteCompound
CP2442 EngineOil
CP5069 CalibrationFluid
CP5070 Vaseline
B. IndustrySupportInformation
Parts: CFMwillprovidea50%back-enddi scountonthelogistic kit333-089-185-000.
Refertoparagraph2.A.Ma terial-PriceandAvailability.
Labor: CFMwillsupportthe4manhoursnecessarytoreworktheoldAGBtothenewone.
Allwarrantyclaimsforcreditrequestonthelogistickitandthelabormustbesubmitted
withinoneyearofcomplianceandbyDecember31,2016. SendaWarrantyClaimwiththe
numberofthisServiceBulletintoCFMthroughyourroutinechannelorto:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 6

### Page 7

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
Europe,MiddleEast,andAfricaRegionCustomers
CFMSACustomers
CFMCustomerSupportOperation
Attn: WarrantyandGuaranteeManager
c/oSnecma-SitedeMelun-Montereau
AerodromedeVillaroche-BP1936
77019MelunCedex-France
Tel: 33(0)164.14.85.72
Fax: 33(0)164.14.87.65
NorthandSouthAmericaandAsiaCustomers
CFMInc. Customers
CFMInternationalInc.
Attn: ManagerWarrantyAdministration
OneNeumannWay-Room444
Cincinnati,OH 45215-1988USA
Tel: 15135522000
Fax: 15135525081
C. Con/g191gurationChart
NewPartNumber
Qty/
Eng PartName
Old
PartNumber/
IPCLocation
Qty/
Eng OP
Chg/
Sprt
Code
9325M80G01-G02-G03
-G04-G05
(X) EngineAssy 9325M80G01-G02-G03
-G04-G05
72-00-00-22-001
(X) RM -/-
9325M85G01-G02-G03
-G04-G05
(X) EngineAssy 9325M85G01-G02-G03
-G04-G05
72-00-00-22-001
(X) RM -/-
9325M90G01-G02-G03 (X) EngineAssy 9325M90G01-G02-G03
72-00-00-22-001
(X) RM -/-
.335-300-112-0 (1) Gearbox Assy -
Accessory
.335-300-110-0
72-00-00-22-930
72-63-00-04-001
72-63-00-10-001
(1) SU/
RW/
RI
1/A
.. J626P04 (1) Nut-SelfLocking ..J626P04
72-63-00-04-440
(1) RM -/-
.. 649-671-392-0 (Alt) Nut-SelfLocking ..649-671-392-0
72-63-00-04-440
(Alt) RM -/-
.. 649-393-012-0 (1) Packing-Preformed
O-Ring
..649-393-012-0
72-63-00-04-450
(1) RM -/-
.. J221P012 (Alt) Packing-Preformed
O-Ring
..J221P012
72-63-00-04-450
(Alt) RM -/-
.. 649-393-013-0 (1) Packing-Preformed
O-Ring
..649-393-013-0
72-63-00-04-460
(1) RM -/-
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 7

### Page 8

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
NewPartNumber
Qty/
Eng PartName
Old
PartNumber/
IPCLocation
Qty/
Eng OP
Chg/
Sprt
Code
.. J221P013 (Alt) Packing-Preformed
O-Ring
..J221P013
72-63-00-04-460
(Alt) RM -/-
.. 335-310-300-0 (1) Nozzle-Oil ..335-310-300-0
72-63-00-04-470
(1) RM -/-
.. 335-300-807-0 (1) Pad Assy - Drive
Starter
..335-300-803-0
72-63-00-04-480
seeNote4
(1) SU 5/A
... 300-300-904-0 (1) Pad-DriveStarter ...335-300-902-0
72-63-00-04-600
(1) SU 5/A
... 300-300-904-0 (-) Pad-DriveStarter ...335-300-903-0
72-63-00-04-600
(Alt) SU 5/A
... J1037P06 (1) Nipple ...J1037P06
72-63-00-04-590
(1) RM -/-
... 649-393-012-0 (1) Packing-Preformed
O-Ring
...649-393-012-0
72-63-00-04-580
(1) RM -/-
... J221P012 (Alt) Packing-Preformed
O-Ring
...J221P012
72-63-00-04-580
(Alt) RM -/-
... J970P06 (2) Insert - Screw
Threaded
...J970P06B
72-63-00-04-570
(2) SU 5/E
... 649-079-401-0 (1) Stud-LockedInKey
Locked
...649-079-401-0
72-63-00-04-560
(1) RM -/-
... 649-079-402-0 (3) Stud-LockedInKey
Locked
...649-079-402-0
72-63-00-04-550
(3) RM -/-
- (-) Insert ...REA048SF
(301-487-200-0)
72-63-00-04-540
(3) DE 5/E
... 301-487-002-0 (2) Pin-Centering ...301-487-002-0
72-63-00-04-520
(2) RM -/-
... J970P04 (5) Insert - Screw
Threaded
...J970P04B
72-63-00-04-500
(5) SU 5/E
... SRK374L (8) Insert-KeyLocked ...SRK374L
72-63-00-04-510
(8) RM -/-
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 8

### Page 9

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
NewPartNumber
Qty/
Eng PartName
Old
PartNumber/
IPCLocation
Qty/
Eng OP
Chg/
Sprt
Code
... 649-079-400-0 (3) Stud-LockedInKey
Locked
- (-) AD 5/-
... 340-152-101-0
seeNote4
(5) Plug - (-) AD 5/-
.. 335-310-200-0 (1) Spool ..335-310-200-0
72-63-00-10-240
(1) RM -/-
.. J221P114 (1) Packing-Preformed
O-Ring
..J221P114
72-63-00-10-220
(1) RM -/-
.. 649-393-114-0 (Alt) Packing-Preformed
O-Ring
..649-393-114-0
72-63-00-10-220
(Alt) RM -/-
.. J221P013 (2) Packing-Preformed
O-Ring
..J221P013
72-63-00-10-230
(2) RM -/-
.. 649-393-013-0 (Alt) Packing-Preformed
O-Ring
..649-393-013-0
72-63-00-10-230
(Alt) RM -/-
.. 335-322-806-0 (1) Cover-Assy ..335-322-802-0
72-63-00-04-242
(1) SU 5/A
... 335-309-605-0
seeNote4
(1) Cover ...335-309-604-0
72-63-00-04-244
(1) SU 5/-
... 335-322-902-0
seeNote4
(1) Cable ...335-322-901-0
72-63-00-04-246
(1) SU 5/-
- (-) Packing-Preformed
O-Ring
..J221P134
72-63-00-04-235
(2) DE 5/-
- (-) Packing-Preformed
O-Ring
..649-393-134-0
72-63-00-04-235
(Alt) DE 5/-
- (-) Packing-Preformed
O-Ring
..AS3085-134
72-63-00-04-235
(Alt) DE 5/-
- (-) Packing-Preformed
O-Ring
..M83248-1-134
72-63-00-04-235
(Alt) DE 5/-
.. 649-393-153-0 (1) Packing-Preformed
O-Ring
- (-) AD 5/-
.. 649-341-031-0 (5) Washer-/g192at ..649-341-031-0
72-63-00-04-220
(5) RM -/-
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 9

### Page 10

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
NewPartNumber
Qty/
Eng PartName
Old
PartNumber/
IPCLocation
Qty/
Eng OP
Chg/
Sprt
Code
.. J644P11B (5) Bolt-MachDblHexHd ..J644P11B
72-63-00-04-210
(5) RM -/-
.. 335-317-805-0 (1) OilSeal-Assy - (-) AD 5/-
... 335-324-301-0 (1) Packing-Preformed
O-Ring
- (-) AD 5/-
... 335-320-403-0 (1) OilSeal-Subassy
MatchedParts
- (-) AD 5/-
.... 335-324-202-0 (1) OilSeal - (-) AD 5/-
.... 335-317-702-0 (1) Ring-Mating - (-) AD 5/-
.. 649-393-032-0 (1) Packing-Preformed
O-Ring
- (-) AD 5/-
.. J221P032 (Alt) Packing-Preformed
O-Ring
- (-) AD 5/-
.. J626P03 (3) Nut-SelfLocking - (-) AD 5/-
.. 649-341-010-0 (3) Washer-Flat - (-) AD 5/-
NOTE1: Speci/g191cation2000ChangeCodes
- = Not applicable.
1 = One way interchangeable.
5 = Quali/g191ed interchangeability - parts deleted.
5 = Quali/g191ed interchangeability - parts added.
5=Quali/g191edinterchangeability-Refertoparagraph1.KI nterchangeability.
NOTE2: SparePartsSupportCodes
- = Not applicable.
A = Old parts will no longer be supplied.
E=Oldpartswillbesupplied,andcanbeusedatotherenginelocations.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 10

### Page 11

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
NOTE3: OperationCodes
AD = Added
DE = Deleted
RI = Reidenti/g191ed
RM = Remains
RW = Reworked
SU=Superseded
NOTE4: Thispartisnotprocurable.
D. DispositionofParts
PartNumbers335-322-802-0and335-300-803-0removedtoaccomplishthisService
Bulletinmaybelocallyscrapped.
E. Tooling-PriceandAvailability
ToolNumber Description
856A3545G03 RiggingFixture
856A1130G01 ToolSet,Jackscrews
856A2971G02 Removal/Installation,SealolandMagneticSeals
856A2979G01 ToolSet,Target-AGBOilNozzle(LineN°2)AirImpingement
Check
856A3548G02 ToolSet,Targets-AGBOilNozzleAirImpingementCheck
856A3549G02 ToolSet,LeakTest-AGB
3. ACCOMPLISHMENTINSTRUCTIONS
NOTE1: ChangesintroducedbythisServiceBulletinhavenoeffectontheremoval/installation
anddisassembly/assemblyofAGBassemblyexceptfortheimpingementtestof
theoilnozzle.
NOTE2: ChangesintroducedbythisServiceBulletinhavenoeffectontheremoval/installation
anddisassembly/assemblyofstarterdrivepadassemblyexceptfortheinstallation
ofthenewoilsealassy.
CAUTION: TOPREVENTINJURY,INSTALLAPROTECTIVECOVERONTHEFREE
ENDOFOLDCABLE 335-322-901-0OFTHEOLDHANDCRANKINGCOVER
ASSY335-322-802-0WHENYOUREMOVETHEFUELSUPPLYTUBEASSY
335-216-301-0OR335-216-302-0FROMTHEOLDAGB 335-300-110-0.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 11

### Page 12

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
A. RemovaloftheoldAGBassembly335-300-110-0equippedwithitsoldstarterdrivepad
assembly335-300-803-0andhandcrankingcoverassembly335-322-802-0fromthe
engineassembly. RefertoEngineShopManual(ESM),ATA72-00-63,Removal001.
Referto/g191gure1.
B. Removaloftheoldhandcrankingcoverassembly335-322-802-0andstarterdrivepad
assembly335-300-803-0fromtheoldAGBassembly335-300-110-0. RefertoEngineShop
Manual(ESM),ATA72-63-00,Disassembly001. Referto/g191gure2,/g191gure3and/g191gure4.
NOTE: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothenew
AGBassembly335-300-112-0.
(1) Removetheoldhandcrankingcoverassembly335-322-802-0fromtheoldAGB
assembly335-300-110-0asfollows:
(a) RemovetheboltJ644P06Awhichattatchtheoldcable335-322-901-0ofthe
oldhandcrankingcoverassy335-322-802-0ontheAGB335-300-110-0.
(b) RemovetheboltsJ644P11Bandwashers649-341-031-0whichattachtheold
handcrankingcoverassembly335-322-802-0.
(c) Removetheoldhandcrankingcoverassembly335-322-802-0,usetheP12of
thetoolset-jackscrews,856A1130G01.
(d) Removeanddiscardtheoldhandcrankingcoverassembly335-322-802-0and
twoO-ringsJ221P134or649-393-134-0orAS3085-134orM83248-1-134.
(2) Removetheoldstarterdrivepadassembly335-300-803-0withthehandcranking62
toothgearshaftassembly335-302-403-0fromtheoldAGBassembly335-300-110-0
asfollows:
(a) RemovetheboltsJ644P12Bandwashers649-341-031-0whichattachtheold
starterdrivepadassembly335-300-803-0toAGBhousing.
(b) Removetheoldstarterdrivepadassembly335-300-803-0withthe
handcranking62toothgearshaftassembly335-302-403-0,usetheP12of
toolset-jackscrews,856A1130G01.
(c) Installaprotectiverubbercoverontheinnerraceoftherollerbearing
301-480-720-0or301-480-723-0or301-480-724-0or301-480-726-0or
340-055-801-0ofthe62toothgearshaftassembly335-302-403-0.
(3) Removethehandcranking62toothgearshaftassembly335-302-403-0fromtheold
starterdrivepadassembly335-300-803-0asfollows:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 12

### Page 13

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(a) RemovethenutsJ626P04whichattachthe62toothgearshaftassembly
335-302-403-0withitsoilcollector335-309-900-0fromthestarterdrivepad
assembly335-300-803-0.
(b) Lightly heatthe bearinghousing onthe starterdrivepadassembly
335-300-803-0withaheatgun. Donotincreasethetemperatureofhousing
over300°F(150°C).
(c) Removethe62toothgearshaftassembly335-302-403-0withitsballbearing
335-304-401-0or335-304-402-0or335-304-403-0or340-052-602-0
andoilcollector335-309-900-0fromtheoldstarterdrivepadassembly
335-300-803-0. Keepthe62toothgearshaftassemblyforreinstallation.
(d) Removeanddiscardtheoldstarterdrivepadassembly335-300-803-0and
theO-ringsJ221P163or649-393-163-0andJ221P158or649-393-158-0.
(4) Removetheoilnozzle335-310-300-0fromtheoldstarterdrivepadassembly
335-300-803-0ofoldAGBassembly335-300-110-0asfollows:
(a) RemovethenutJ626P04whichattachtheoilnozzle335-310-300-0totheold
starterdrivepadassembly335-300-803-0.
(b) Removetheoilnozzle335-310-300-0fromthestarterdrivepadassembly.
(c) RemoveanddiscardtheO-ringsJ221P012or649-393-012-0andJ221P013
or649-393-013-0.
(5) Removethespool335-310-200-0fromitslocationinthehousingofoldAGB
assembly335-300-110-0asfollows:
(a) Removethespool335-310-200-0fromitsplaceintheAGBhousing.
(b) RemoveanddiscardtheO-ringsJ221P114or649-393-114-0andJ221P013
or649-393-013-0.
C. ImpingementTestoftheOilNozzle335-310-300-0ofthenewstarterdrivepadassembly
335-300-807-0. Referto/g191gure1,/g191gure4and/g191gure5.
NOTE: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothenew
AGBassembly335-300-112-0.
(1) Installtheoilnozzle335-310-300-0onthenewstarterdrivepadassembly
335-300-807-0ofnewAGBassembly335-300-112-0asfollows:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 13

### Page 14

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(a) LightlycoatthenewO-rings649-393-012-0orJ221P012and649-393-013-0
orJ221P013withengineoil(CP2442).
InstallthenewO-rings649-393-012-0orJ221P012and649-393-013-0or
J221P013ontheouterdiameterofoilnozzle335-310-300-0.
(b) Installtheoilnozzle335-310-300-0o nthenewstarterdrivepadassembly
335-300-807-0withthestud649-079-401-0aslocator.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(c) LightlycoatthenutJ626P04withengineoil(CP2442).
(d) InstallthenutJ626P04whichattachtheoilnozzle335-310-300-0tothenew
starterdrivepadassembly335-300-807-0.
(e) TorquethenutJ626P04to97-106lbin. (11-12N.m).
(2) InstallthetargetP01oftheTarget-AGBoilnozzleairimpingementcheck,tool
(LineN°2),856A2979G01asfollows:
(a) InstallthemasterindexP02initslocationonthetargetP01oftheTarget-
AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(b) InstallthetargetP01oftheTarget-AGBoilnozzleairimpingementcheck,
tool(LineN°2),856A2979G01initslocationontherearfaceofthenewstarter
drivepadassembly335-300-807-0. AligntheholesofthetargetP01withthe
studs649-079-402-0.
(c) AttachthetargetP01oftheTarget-AGBoilnozzleairimpingementcheck,
tool(LineN°2),856A2979G01totherearfaceofthenewstarterdrivepad
assembly335-300-807-0withtheknurlednutP03.
(d) TightenwithhandtheknurlednutP03.
(3) Installthenewstarterdrivepadassembly335-300-807-0onthesupportplateP10
ofTarget-AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01
asfollows:
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 14

### Page 15

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(a) InstallthecenteringpinP14initslocationonthesupportplateP10ofTarget-
AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(b) InstallthesupportplateP10oftheTarget-AGBoilnozzleairimpingement
check,tool(LineN°2),856A2979G01ontheadaptationsupportofrigging
/g191xture,856A3545G03.
(c) AttachthesupportplateP10totheadaptationsupportwiththetwoboltsof
rigging/g191xture,856A3545G03. Tightenwithhandthetwobolts.
(d) Installthenewstarterdrivepadassembly335-300-807-0onthesupportplate
P10oftheTarget-AGBoilnozzleairimpingementcheck,tool(LineN°2),
856A2979G01. Aligntheholeofthestarterdrivepadwiththecenteringpin
P14.
(e) InstallthetwothreadedrodsP13with/g191xingguidesandnutsP15ontheir
locationsonthesupportplateP10ofTarget-AGBoilnozzleairimpingement
check,tool(LineN°2),856A2979G01.
(f) Attachthenewstarterdrivepadassembl y335-300-807-0tothethreaded
rodP13installedonthesupportplateP1 0oftheTarget-AGBoilnozzleair
impingementcheck,tool(LineN°2),85 6A2979G01with/g191xingguidesandthe
nutsP15. TightenwithhandthenutsP15.
(g) Makesurethatthestarterdrivepadassembly335-300-807-0iscorrectly
installedandtightenedontherigging/g191xture,856A3545G03.
(4) InstalltheconnectingtubeP09oftheTarget-AGBoilnozzleairimpingementcheck,
tool(LineN°2),856A2979G01asfollows:
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEINAWELL-VENTILLATEDAREA.
(a) LightlycoattwonewO-rings649-393-013-0orJ221P013withengineoil
(CP2442).
(b) InstalltheO-rings649-393-013-0orJ221P013inthegroovesofthejointbase
P04(padside)andjointbaseP05(housingside)oftheTarget-AGBoilnozzle
airimpingementcheck,tool(LineN°2),856A2979G01.
(c) PutthejointbaseP04inpositionattherearfaceofthenewstarterdrivepad
assembly335-300-807-0.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 15

### Page 16

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(d) Installthetwo/g191xingguides,threadedrodsP13andnutsP15oftheTarget-
AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01fromthe
frontfaceofthenewstarterdrivepadassembly335-300-807-0.
(e) AttachthejointbaseP04tothenewstarterdrivepadassembly335-300-807-0
withthetwo/g191xingguides,threadedrods P13andnutsP15oftheTarget-AGB
oilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(f) TightenwithhandthenutsP15.
(g) PutthejointbaseP05inpositionatthespool335-310-200-0locationofthe
AGBhousing.
(h) AttachthejointbaseP05totheAGBhousingwiththetwothreadedboltsofthe
Target-AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(i) Tightenwithhandthetwothreadedbolts.
(j) InstalltheconnectingtubeP09(/g192exib le)withitsthreadedadaptorsP12and
BSringsP11betweenthetwojointbasesP04andP05oftheTarget-AGBoil
nozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(k) MakesurethatconnectingtubeP09iscorrectlyinstalled.
(l) TightenwithhandthetwocouplingnutsofconnectingtubeP09oftheTarget-
AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(5) InstallationofthetestinstallationToolset,Targets-AGBoilnozzleairimpingement
checks(toolset),856A3548G02asfollows:
(a) Connectthetestinstallationthroughc onnecting/g191ttingofToolset,Targets
-AGBoilnozzleairimpingementchecks(toolset),856A3548G02tothe
restrictornipple335-308-500-0.
(b) Setthetestconditionsasfollows:
WARNING: CALIBRATION FLUID IS TOXIC AND FLAMMABLE.
USEPERSONALPROTECTIONEQUIPMENT.USEINA
WELL-VENTILATEDAREA.
1 Calibration/g192uid: calibration/g192uid(CP5069).
2 Temperature: 80.6to89.6degF(27to32degC).
3 Supplypressure: 2.9to3.1bar.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 16

### Page 17

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
4 TotalAGB/g192owrate: 167.0to184.3USgal/h(634,0to697,4l/h)as
monitoredonthe/g192owmeterduringthetest.
(c) Afterthestabilityofparameters,supplythepressuretotheoilnozzleand
verifythefollowing:
1 Thedirectionofoiljetiscorrect.
2 Thequalityofoiljetiscorrect. Youmusthaveahomogenousjetand
nothaveaspraypattern.
NOTE: Alightsprayofoilaroundthetargetholeisacceptable. Thejet
sectioncanhaveanincompletelycircularshape.
(d) Afteryoucompletethetest,letthepressuredecreasegradually.
(e) Ifthetestresultisnotcorrect,replacethenewstarterdrivepadassembly
335-300-807-0anddothetestagain.
(f) Disconnecttheconnecting/g191ttingofToolset,Targets-AGBoilnozzleair
impingementchecks(toolset),856A3548G02fromtherestrictornipple
335-308-500-0.
(6) RemovetheconnectingtubeP09oftheTarget-AGBoilnozzleairimpingement
check,tool(LineN°2),856A2979G01asfollows:
(a) LoosenthetwocouplingnutsofconnectingtubeP09oftheTarget-AGBoil
nozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(b) RemovetheconnectingtubeP09(/g192exible)anditsthreadedadaptorsP12and
BSringsP11fromthetwojointbasesP04andP05oftheTarget-AGBoil
nozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(c) LoosenthetwothreadedboltsoftheTarget-AGBoilnozzleairimpingement
check,tool(LineN°2),856A2979G01which attachthejointbaseP05tothe
AGBhousing.
(d) RemovethejointbaseP05fromtheAGBhousing.
(e) LoosenandremovethetwonutsP15,threadedrodsP13and/g191xingguides
oftheTarget-AGBoilnozzleairimpingementcheck,tool(LineN°2),
856A2979G01whichattachthejointbaseP04tothenewstarterdrivepad
assembly335-300-807-0.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 17

### Page 18

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(f) RemovethejointbaseP04fromtherearfaceofthenewstarterdrivepad
assembly335-300-807-0.
(g) RemoveanddiscardtheO-rings649-393-013-0orJ221P013fromthegrooves
ofthejointbaseP04andjointbaseP05oftheTarget-AGBoilnozzleair
impingementcheck,tool(LineN°2),856A2979G01.
(7) Removethenewstarterdrivepadassembly335-300-807-0fromthesupportplate
P10ofTarget-AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01
asfollows:
(a) LoosenandremovethethreadedrodP13withthenutP15andthe/g191xing
guidewhichattachthenewstarterdrivepadassembly335-300-807-0onthe
supportplateP10oftheTarget-AGBoilnozzleairimpingementcheck,tool
(LineN°2),856A2979G01.
(b) Removethenewstarterdrivepadassembly335-300-807-0fromthesupport
plateP10oftheTarget-AGBoilnozzleairimpingementcheck,tool(Line
N°2),856A2979G01.
(c) LoosenthetwoboltswhichattachthesupportplateP10totheadaptation
supportofrigging/g191xture,856A3545G03.
(d) RemovethesupportplateP10oftheTarget-AGBoilnozzleairimpingement
check,tool(LineN°2),856A2979G01fromtheadaptationsupportofrigging
/g191xture,856A3545G03.
(e) RemovethecenteringpinP14fromitslocationonthesupportplateP10of
Target-AGBoilnozzleairimpingementcheck,tool(LineN°2),856A2979G01.
(8) RemovethetargetP01oftheTarget-AGBoilnozzleairimpingementcheck,tool
(LineN°2),856A2979G01asfollows:
(a) LoosenandremovetheknurlednutP03oftheTarget-AGBoilnozzleair
impingementcheck,tool(LineN°2),856A2979G01whichattachthetarget
P01totherearfaceofthenewstarterdrivepadassembly335-300-807-0.
(b) RemovethetargetP01oftheTarget-AGBoilnozzleairimpingementcheck,
tool(LineN°2),856A2979G01.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 18

### Page 19

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(c) RemovethemasterindexP02fromthetargetP01oftheTarget-AGBoil
nozzleairimpingementcheck,tool(LineN°2),856A2979G01.
D. Installationofthespool335-310-200-0andthenewstarterdrivepadassembly
335-300-807-0onthenewAGBassembly335-300-112-0. RefertoEngineShopManual
(ESM),ATA72-63-00,Assembly001. Referto/g191gure2,/g191gure3and/g191gure4.
NOTE: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothenew
AGBassembly335-300-112-0.
(1) Installthespool335-310-200-0initsplaceinthenewAGBassembly335-300-112-0
asfollows:
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(a) LightlycoatthenewO-ring649-393-114-0orJ221P114withengineoil
(CP2442).
InstallthenewO-ring649-393-114-0orJ221P114ontheouterdiameterof
spool335-310-200-0.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(b) Lightly coat the new O-rings 649-393-013-0
or J221P013 with engine oil (CP2442) .
Install the new O-rings 649-393-013-0 or J221P013 on the
groovesofspool335-310-200-0.
(c) Installthenewspool335-310-200-0withtheO-rings649-393-013-0or
J221P013andO-ring649-393-114-0orJ221P114initsplacebetweenthe
AGBhousingandthenewstarterdrivepadassembly335-300-807-0.
(2) Installthehandcranking62toothgearshaftassembly335-302-403-0onthe
newstarterdrivepadassembly335-300-807-0asfollows:
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 19

### Page 20

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(a) Lightlycoattheouterdiameteroftheballbearing335-304-401-0or
335-304-402-0or335-304-403-0or340-052-602-0ofthe62toothgearshaft
assembly335-302-403-0withengineoil(CP2442).
(b) Heatthebearinghousingonthenewstarterdrivepadassembly335-300-807-0
withaheatgun.
Donotincreasethetemperatureofthebearinghousingover311°F(155°C).
(c) Installtheballbearingendofthe62toothgearshaftassembly335-302-403-0
withitsoilcollector335-309-900-0inthenewstarterdrivepadassembly
335-300-807-0withthestudsonpadaslocators.
(d) Installtheoilcollector335-309-900-0relativetotheballbearing. Aligntheoil
collectorwiththestudsonpad.
(e) Attachthe62toothgearshaftassembly335-302-403-0anditsoilcollector
335-309-900-0tothestuds649-079-402-0ofthenewstarterdrivepad
assembly335-300-807-0withtheselflockingnutsJ626P04.
(f) Letthepartsgobacktoambienttemperature.
(g) TorquethenutsJ626P04to97-106lbin. (11-12N.m).
(h) Makesurethatthe62toothgearshaftassembly335-302-403-0isfully
engagedinthestarterdrivepadassembly335-300-807-0witha0.0016inch
(0,04mm)feelergagetoverifytheclearancebetweentheballbearing/g192ange
andthestarterdrivepadsurface. RefertoEngineShopManual(ESM),ATA
72-63-00,Assembly001.
E. Installationofthenewoilsealassembly335-317-805-0,handcrankingcoverassembly
335-322-806-0onthenewAGBassembly335-300-112-0. RefertoEngineShopManual
(ESM),ATA72-63-00,Assembly001. Referto/g191gure2,/g191gure3,/g191gure4,/g191gure6,/g191gure
7and/g191gure8.
NOTE: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothenew
AGBassembly335-300-112-0.
(1) Assemblyofthenewremoval/installationtool,856A2971G02toinstallthenewoil
sealassembly335-317-805-0onthehandcranking62toothgearshaftassembly
335-302-403-0asfollows: Referto/g191gure7
(a) InstallthegripP16oftheremoval/installationtool,856A2971G02intothe
sheathP17. Tightenthegripinthesheath.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 20

### Page 21

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(b) InstalltheknurlednutP19oftheremoval/installationtool,856A2971G02on
thegripP16. Aligntheholesand/g191xwithscrewsP20.
(c) InstalltheguideaxisP18oftheremoval/installationtool,856A2971G02
throughtheholeoftheexpanderP05.
(d) Installthe dowelpinP21 intothe hole of theguide axisP18ofthe
removal/installationtool,856A2971G02.
(e) Installtheanti-rotationkeyP06intothenotchoftheguideaxisP18ofthe
removal/installationtool,856A2971G02.
(f) Insert the guide axis P18 equipped with expander P05 of the
removal/installationtool,856A2971G02intothegripP16.
(g) Aligntheanti-rotationkeyP06withtheguidesplinesofgripP16ofthe
removal/installationtool,856A2971G02. Fullyinserttheguideaxisintothe
grip.
(h) InstallthenutP08onguideaxisP18oftheremoval/installationtool,
856A2971G02.
(i) Installthe/g192atwasherP12andthescrewP11onguideaxisP18ofthe
removal/installationtool,856A2971G02.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(j) LightlycoattheViton /g159EO-ringP14(Ø19x3.53mm(Ø0,75x0,1390in.)) of
theremoval/installationtool,856A2971G02withengineoil(CP2442).
InstalltheO-ringontheouterdiameterofcenteringguideP09ofthe
removal/installationtool,856A2971G02.
(k) EngagethecenteringguideP09oftheremoval/installationtool,856A2971G02
intotheupperendofthehandcranking62toothgearshaftassembly
335-302-403-0.
CAUTION: USECLEAN,LINT-FREEGLOVESWHENYOUTOUCHTHEOILSEAL
TOPREVENTCONTAMINATION.
(2) Installthematingring335-317-702-0ofnewoilsealassembly335-317-805-0on
thehandcranking62toothgearshaftassembly335-302-403-0asfollows: Referto
/g191gure3,/g191gure6and/g191gure7
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 21

### Page 22

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
CAUTION: MAKESURETHEPOLISHEDFACEOFTHEMATINGRINGAND
THECARBONFACEOFTHESEALHOUSINGARECLEAN.LEAKS
WILLOCCURIFPARTICLES,EVENOFAVERYSMALLSIZE,ARE
BETWEENTHESEPARTSDURINGTHEINSTALLATION.
(a) Cleanthematingsurfaceofthematingring335-317-702-0withtissuepaper.
(b) Cleantheglazedsurfaceoftheoil seal335-324-202-0 withtissuepaper.
WARNING: VATTANKCOVERSANDEXTINGUISHERSMUSTBEAVAILABLEIF
AFIREOCCURS.SOLVENTISFLAMMABLE.
WARNING: CLEANINGSOLVENTISTOXICANDFLAMMABLE.USEPERSONAL
PROTECTIVEEQUIPMENT.USEPERSONALPROTECTION
WELL-VENTILATEDAREA..
CAUTION: OBEYTHEENVIRONMENTALREGULATIONWHENYOUDISCARD
CONSUMABLEPRODUCTS.
(c) Cleanthesurfaceofthehandcranking62toothgearshaftassembly
335-302-403-0matingwiththeoilseal matingringwithalint-lesscloth
moistenedbyAcetone(CP1039).
(d) LightlycoattheO-ring 335-324-301-0ofthenewoilsealassembly
335-317-805-0withvaseline(CP5070).
(e) InstalltheO-ring335-324-301-0inthegrooveattheinnerdiameterofnew
matingring335-317-702-0.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(f) Lightlycoatthematingsurfaceofthematingring335-317-702-0withengine
oil(CP2442).
(g) Lightlycoatthematingsurfacesofthehandcranking62toothgearshaft
assembly335-302-403-0whichisincontactwiththeO-ring335-324-301-0on
thematingring335-317-702-0withengineoil(CP2442).
(h) Loosen the nut P08 and the grip P16 of removal/installation tool,
856A2971G02.
(i) Install the mating ring 335-317-702-0 on the claws of grip P16 of
removal/installationtool,856A2971G02.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 22

### Page 23

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(j) TightenthegripP16andnutP08ofremoval/installationtool,856A2971G02.
MakesurethatthepositionofringiscorrectintheclawsofthegripP16.
(k) TightenthesheathP17ofremoval/installationtool,856A2971G02tolockthe
matingring335-317-702-0intheclawsofthegripP16.
(l) Insertthematingring335-317-702-0withtheremoval/installationtool,
856A2971G02intoitscenteringguideP09.
(m) Installthematingring335-317-702-0onthehandcranking62toothgearshaft
assembly335-302-403-0withtheremoval/installationtool,856A2971G02.
(n) Turntheremoval/installationtool,856A2971G02untilthelugsofmatingring
335-317-702-0engageintotheslotsoftheballbearinginnerrace.
(o) Makesurethatthematingring335-317-702-0iscorrectlyinstalled. Thebottom
faceofthesidewindowofsheathP17removal/installationtool,856A2971G02
mustbeinlinewiththeAGBforwardface.
(p) LoosenthesheathP17ofremoval/installationtool,856A2971G02.
(q) Pushtheremoval/installationtool,856A2971G02tomakesurethatthemating
ring335-317-702-0staysinplace.
CAUTION: MAKESURETHATTHEGRIPCLAWSARETOTALLYLOOSENED
ANDTHATYOUDONOTPULLANDDISENGAGETHEMATING
RINGWITHTHEREMOVAL/INSTALLATIONTOOL.RINGDAMAGE
ANDOILLEAKAGECANOCCURS.
(r) LoosenthenutP08andthegripP16oftheremoval/installationtool,
856A2971G02.
(s) Removetheremoval/installationtool,856A2971G02fromthestarterdrive
padassy.
(t) Remove the centering guide P09 of the removal/installation tool,
856A2971G02fromthe62toothgearshaftassembly335-302-403-0.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(u) Lightlycoatthematingsurfaceofthematingring335-317-702-0withengine
oil(CP2442).
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 23

### Page 24

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
CAUTION: USECLEAN,LINT-FREEGLOVESWHENYOUTOUCHTHEOILSEAL
TOPREVENTCONTAMINATION.
(3) Preparetheinstallationofoilsealhousing335-324-202-0ofnewoilsealassembly
335-317-805-0asfollows: Referto/g191gure3,/g191gure6and/g191gure7
WARNING: VATTANKCOVERSANDEXTINGUISHERSMUSTBEAVAILABLEIF
AFIREOCCURS.SOLVENTISFLAMMABLE.
WARNING: CLEANINGSOLVENTISTOXICANDFLAMMABLE.USEPERSONAL
PROTECTIVEEQUIPMENT.USEPERSONALPROTECTION
WELL-VENTILATEDAREA.
CAUTION: OBEYTHEENVIRONMENTALREGULATIONWHENYOUDISCARD
CONSUMABLEPRODUCTS.
(a) Removethegreasefromthematingsurfaceofoilsealhousingassembly
335-324-202-0withalint-lessclothmoistenedbyacetone(CP1039).
(b) Removethegreasefromthematingsurf aceofnewstarterdrivepadassembly
335-300-807-0withalint-lessclothmoistenedbyacetone(CP1039).
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(c) LightlycoattheO-ring649-393-032-0orJ221P032ofthenewoilseal
assembly335-317-805-0withengineoil(CP2442).
(d) InstalltheO-ring649-393-032-0orJ221P032inthegrooveattheouter
diameterofnewoilseal335-324-202-0.
CAUTION: BECAREFULDONOTHITTHEOILSEALINTOTHEGEARBOX
RECESS.THEMATINGRINGCANMOVEAPARTANDCARBON
SEALCANBEDAMAGED.
(e) Installtheoilsealhousingassembly335-324-202-0onhandcranking62tooth
gearshaftassembly335-302-403-0. S lowlylowerthehousingassembly.
(f) Makesurethatthehousingofoilseal335-324-202-0iscorrectlyengaged
withthethreestuds649-079-400-0onthenewstarterdrivepadassembly
335-300-807-0.
(g) Applyathinlayerofvaseline(CP5070)onthethreadsofthreenutsJ626P03.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 24

### Page 25

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(h) Attachthehousingoilseal335-324-202-0withthenutsJ626P03andthethree
washers649-341-010-0ofnewstarterdrivepadassembly335-300-807-0.
(i) TorquethethreenutsJ626P03whichattachthehousingofoilseal
335-324-202-0to29.2-32.7lbin. (3.3-3.7N.m).
(4) Installthenewstarterdrivepadassembly335-300-807-0withthehandcranking62
toothgearshaftassembly335-302-403-0onthenewAGBassembly335-300-112-0
asfollows:
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(a) LightlycoatthenewO-ringsJ221P163or649-393-163-0andJ221P158or
649-393-158-0withengineoil(CP2442).
(b) InstallthenewO-ringsJ221P163or649-393-163-0onthenewstarterdrive
padassembly335-300-807-0.
(c) InstallthenewO-ringJ221P158or649-393-158-0ontheAGBhousing.
(d) Remove the rubber cover from the inner race of the roller bearing
301-480-720-0or301-480-723-0or301-480-724-0or301-480-726-0or
340-055-801-0ofthe62toothgearshaftassembly335-302-403-0.
(e) Lowercarefullythenewstarterdrivepadassembly335-300-807-0withthe62
toothgearshaftassembly335-302-403-0inposition.
Doaspecialattentionwhenyouengagetheinnerraceoftherollerbearing
301-480-720-0or301-480-723-0or301-480-724-0or301-480-726-0or
340-055-801-0withitsouterrace.
(f) DoaspecialattentionwhenyouengagethenewO-ringsJ221P163or
649-393-163-0intheAGBhousing.
(g) ApplyathinlayerofGraphitecompound(CP2101)onthethreadsofbolts
J644P12B.
(h) InstalltheboltsJ644P12Bandwashers649-341-031-0whichattachthenew
starterdrivepadassembly335-300-807-0toAGBhousing.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 25

### Page 26

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(i) TorquetheboltsJ644P12Bwhichattachthenewstarterdrivepadassembly
335-300-807-0to97-106lbin. (11-12N.m).
F. DotheleaktestofthenewAGBassembly335-300-112-0beforeitsinstallationonthe
engineassembly. RefertoEngineShopManual(ESM),ATA72-63-00,Assembly001.
NOTE1: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothe
newAGBassembly335-300-112-0.
NOTE2: WhenyoudotheleaktestshowninEngineShopManual(ESM),ATA
72-63-00,Assembly001,usethesprayleakdetectortodetectanyairleakage.
NOTE3: Whenyou/g191nishtheleaktestshowninEngineShopManual(ESM),ATA
72-63-00,Assembly001,dothefollowingstepstomakesurethatthenew
oilsealassembly335-317-805-0correctlyoperatesandthereinnoleakage
throughit.
(1) Installthenewhandcrankingcoverassembly335-322-806-0onthenewstarterdrive
padassembly335-300-807-0ofnewAGBassembly335-300-112-0asfollows:
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(a) Applyathinlayerofengineoil(CP2442)onnewO-ring649-393-034-0or
J221P034.
(b) InstallthenewO-ring649-393-153-0orJ221P153inthegrooveofnew
handcrankingcoverassembly335-322-806-0.
(c) Installthenewhandcrankingcoverassembly335-322-806-0onthenew
starterdrivepadassembly335-300-807-0.
(d) Makesurethatthenewhandcrankingcoverassembly335-322-806-0is
correctlyseatedonthenewstarterdrivepadassembly335-300-807-0.
WARNING: ENGINE OIL IS TOXIC. USE PERSONAL PROTECTION
EQUIPMENT.USEPERSONALPROTECTIONWELL-VENTILATED
AREA.
(e) Applyathinlayerofengineoil(CP2442)onthethreadsofboltsJ644P11B.
(f) Attachthenewhandcrankingcoverassembly335-322-806-0tothenew
starterdrivepadassembly335-300-807-0withthe/g191veboltsJ644P11Band
washers649-341-031-0.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 26

### Page 27

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(g) TorquethenewboltsJ644P11Bto97-106lbin. (11-12N.m).
(h) Installaprotectivecoveronthecabl eofthenewhandcrankingcoverassembly
335-322-806-0topreventinjury.
(2) InstallthestarterdrivepadsealingitemP06ofleaktesttoolset,856A3549G02and
tightenittothestarterdrivepadwithboltsprovidedtocoverthepad.
(3) ConnectthetestairsupplyhoseunderthefollowingconditionstounionP05of
leaktesttoolset,856A3549G02,tothenippleJ1037P06ofnewstarterdrivepad
assembly335-300-807-0:
(a) Watercontent: dewpoint-40°F(-40°C)atatmosphericpressure.
(b) Temperature: ambient.
(c) Air/g191ltration: lowerthan40microns,absolute.
NOTE: Iftheairsupplysourcedoesnotagreewiththeabovetestconditions,
replacebynitrogenofqualityR.
(d) Deoiling: weightofremainingoil,lessthan40mg/kgofair.
(4) Dothetestasfollows,slowlypressurizetheoilsealcompartmentupto10-12psig
(70-80kPagage).
(5) Whenyougetthepressurelevel,closethet estinstallationisolationvalveandclose
theairsupply.
(6) Makesurethatthepressurelevelisstableonthet estinstallationpressuregagefor
10minutes. Theremustbenopressuredecreaseshownonthepressuregage. If
so,correctasfollows:
(a) Findtheleak,usesprayleakdetector.
(b) Depressurizetheoilsealcompartment.
(c) Removetheoilsealandinstallanewone.
(d) Dotheleaktestagain.
(7) Whenyou/g191nishtheleaktest,releasethepressureintheoilsealcompartment.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 27

### Page 28

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
(8) LoosentheboltswhichattachthestarterdrivepadsealingitemP06ofleaktesttool
set,856A3549G02fromthestarterdrivepad. Removethestarterdrivepadsealing
itemP06fromthepad.
G. Re-identi/g191cationoftheOldAGBassembly335-300-110-0tothenewPartNumber
335-300-112-0.
NOTE: ThisstepconcernsthereworkofoldAGBassembly335-300-110-0tothenew
AGBassembly335-300-112-0.
(1) Re-identifytheoldAGBassembly335-300-110-0tothenewAGBassembly
335-300-112-0. RefertoSPM,ATA70-10-12,Vibro-PeenMarkingasfollows:
(a) ScoreouttheoldPartNumberoftheoldAGBassembly335-300-110-0onthe
AGBassemblyidenti/g191cationplate. Referto/g191gure1,sheet1of2.
(b) MarkthenewPartNumberofthenewAGBassembly335-300-112-0andthe
ServiceBulletinNumberontheAGBassemblyIdenti/g191cationplate.
H. InstallationofthenewAGBassembly335-300-112-0ontheengineassembly. Referto
EngineShopManual(ESM),ATA72-00-63,Installation001. Referto/g191gure1and/g191gure2.
NOTE: Whenyouinstallthefuelsupplytubeassy335-216-301-0or335-216-302-0
onthenewAGB335-300-112-0,installthenewcable335-322-902-0ofthe
newhandcrankingcoverassy335-322-806-0withboltJ644P06AonnewAGB
335-300-112-0.
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 28

### Page 29 (OCR)

cim  SERVICE
BULLETIN
THE POWER  CFM56-3
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
VIEW A
AREA OF
CHANGE
HANDCRANKING
COVER ASSY
STARTER
DRIVE
PAD ASSY
IDENTIFICATION
PLATE
S-M56-SB-04478-00-B
Location of Change
Figure 1
CFM56-3/3B/3C S/B 72-1129
March 09, 2011  PAGE 29

### Page 30 (OCR)

cim  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
OLD CONFIGURATION
BOLT
J644P11B
WASHER
HANDCRANKING
649-341-031-0
COVER ASSY
335-322-802-0  BOLT
J644P12B
WASHER
649-341-031-0
STARTER DRIVE
PAD ASSY
335-300-803-0
S-M56-SB-04479-00-B
Removal / Installation of the Handcranking Cover and Starter Drive Pad Assemblies
Figure 2, Sheet 1 of 2
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 30

### Page 31 (OCR)

cim  SERVICE
BULLETIN
THE POWER  CFM56-3
ST TLIGH
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
NEW CONFIGURATION
BOLT
_J644P11B
WASHER
HANDCRANKING  649-341-031-0
COVER ASSY
335-322-806-0
BOLT
J644P12B
WASHER
649-341-031-0
CAUTION
STARTER DRIVE
PAD ASSY
335-300-807-0
NIPPLE
J1037P06
S-M56-SB-04480-00-B
Removal / Installation of the Handcranking Cover and Starter Drive Pad Assemblies
Figure 2, Sheet 2 of 2
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 31

### Page 32 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
OLD CONFIGURATION
STARTER DRIVE
PAD ASSY  STUD
335-300-803-0  649-079-402-0
NUT
O-RING  J626P04
J221P163 OR
649-393-163-0
62 TOOTH
HANDCRANKING
GEARSHAFT ASSY
335-302-403-0
HANDCRANKING  ROLLER BEARING
COVER ASSY  301-480-720-0 OR
335-322-802-0  301-480-723-0 OR
301-480-724-0 OR
301-480-726-0 OR
340-055-801-0
O-RING
J221P134 OR  OIL COLLECTOR
649-393-134-0 OR  335-309-900-0
AS3085-134 OR
M83248-1-134  BALL BEARING
335-304-401-0 OR
335-304-402-0 OR
335-304-403-0 OR
O-RING  340-052-602-0
J221P158 OR
649-393-158-0
BOLT
J644P12B
WASHER
649-341-031-0
S-M56-SB-04481-00-B
Old and New Configuration of Handcranking 62 Tooth Gearshaft and Cover Assemblies
Figure 3, Sheet 1 of 4
CFM56-3/3B/3C S/B 72-1129
March 09, 2011  PAGE 32

### Page 33 (OCR)

(cim)  SERVICE
BULLETIN
THE POWER  CFM56-3
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
OLD CONFIGURATION
BOLT
J644P11B
WASHER
649-341-031-0
HANDCRANKING
COVER ASSY
335-322-802-0
HANDCRANKING
COVER
335-309-604-0
CABLE
335-322-901-0
STARTER DRIVE
- PAD ASSY
335-300-803-0
S-M56-SB-04482-00-B
Old and New Configuration of Handcranking 62 Tooth Gearshaft and Cover Assemblies
Figure 3, Sheet 2 of 4
CFM56-3/3B/3C S/B 72-1129
March 09, 2011  PAGE 33

### Page 34 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
NEW CONFIGURATION
STARTER DRIVE
PAD ASSY
335-300-807-0
STUD
O-RING  649-079-402-0
J221P163 OR
649-393-163-0  NUT
J626P04
STUD
649-079-400-0  62 TOOTH
NUT  HANDCRANKING
J626P03  GEARSHAFT ASSY
WASHER  335-302-403-0
649-341-010-0
ROLLER BEARING
HANDCRANKING  301-480-720-0 OR
COVER ASSY  301-480-723-0 OR
335-322-806-0  301-480-724-0 OR
301-480-726-0 OR
OIL SEAL ASSY  340-055-801-0
335-317-805-0
O-RING  OIL COLLECTOR
J221P032 OR  335-309-900-0
649-393-032-0
BALL BEARING
O-RING  335-304-401-0 OR
J221P153 OR  • 335-304-402-0 OR
649-393-153-0
335-304-403-0 OR
O-RING  340-052-602-0
J221P158 OR
649-393-158-0
BOLT
J644P12B
WASHER
649-341-031-0
S-M56-SB-04483-00-B
Old and New Configuration of Handcranking 62 Tooth Gearshaft and Cover Assemblies
Figure 3, Sheet 3 of 4
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 34

### Page 35 (OCR)

cim  SERVICE
BULLETIN
THE POWEE  CFM56-3
ST TLIGH
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
NEW CONFIGURATION
BOLT
J644P11B
WASHER
649-341-031-0
HANDCRANKING
COVER
335-309-605-0
HANDCRANKING
COVER ASSY  CAL ION
335-322-806-0
SQUE  CABLE
335-322-902-0
STARTER DRIVE
PAD ASSY
335-300-807-0
SECTION BB
STARTER DRIVE
PAD ASSY
335-300-807-0  O-RING
649-393-013-0 OR
J221P013
O-RING
649-393-114-0 OR
J221P114
SPOOL
335-310-200-0  AGB HOUSING  S-M56-SB-04484-00-B
Old and New Configuration of Handcranking 62 Tooth Gearshaft and Cover Assemblies
Figure 3, Sheet 4 of 4
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 35

### Page 36 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
OLD CONFIGURATION
INSERT
J970P04B
(5 LOCATIONS)
STARTER DRIVE
• PAD ASSY
335-300-803-0
OIL NOZZLE
SUPPLY LINE
STARTER
DRIVE PAD
335-300-902-0 OR
335-300-903-0
INSERT
340-487-200-0
(FOR EXTRACTION)
CENTERING PIN
301-487-002-0
(2 LOCATIONS)
DRAIN LINE
(LOCKED)
KEY LOCKED
INSERT
J970P06B
S-M56-SB-04485-00-B
Old and New Configuration of the Starter Drive Pad Assy
Figure 4, Sheet 1 of 4
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 36

### Page 37 (OCR)

(cim  SERVICE
BULLETIN
T RIGHT CFM56-3
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
NEW CONFIGURATION
A  STARTER DRIVE
PAD ASSY
335-300-807-0
INSERT
J970P04
(5 LOCATIONS)
STUD
649-079-400-0
(3 LOCATIONS)
3 EXTRACTION
HOLES
0.250-28UNF-3B
CENTERING PIN
301-487-002-0
(2 LOCATIONS)
NIPPLE
J1037P06
STARTER
DRIVE PAD
335-300-904-0
S-M56-SB-04486-00-B
Old and New Configuration of the Starter Drive Pad Assy
Figure 4, Sheet 2 of 4
CFM56-3/3B/3C S/B 72-1129
March 09, 2011  PAGE 37

### Page 38 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
SECTION AA
SECTION BB
STUD
649-079-400-0
O-RING
J221P012 OR
649-393-012-0
STUD
649-079-402-0
NIPPLE
J1037P06
SECTION DD
VIEW C
INSERT
J970P06
S-M56-SB-04487-00-B
Old and New Configuration of the Starter Drive Pad Assy
Figure 4, Sheet 3 of 4
CFM56-3/3B/3C S/B 72-1129
March 09, 2011

### Page 39 (OCR)

cim  SERVICE
BULLETIN
THE POWEE  CFM56-3
ST TLIGH
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
SECTION EE
DETAIL OF SUPPLY LINE  NEW CONFIGURATION
OIL NOZZLE JET
TOWARDS OIL SEAL
O-RING
• J221P012 OR
649-393-012-0  PLUG
PLUG
340-152-101-0
(5 LOCATONS)
OIL NOZZLE
335-310-300-0
O-RING  PLUG
J221P013 OR
649-393-013-0
SPOOL
LOCATION
OIL NOZZLE
SUPPLY LINE
PLUG
DRAIN LINE
DRAIN LINE
PLUG
S-M56-SB-04488-00-B
Old and New Configuration of the Starter Drive Pad Assy
Figure 4, Sheet 4 of 4
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 39

### Page 40 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
THREADED
ADAPTOR
P12  O-RING
BS RING  PO7
P11  JOINT BASE
(PAD SIDE)
P04
THREADED BOLT
TARGET
P01
KNURLED
NUT
O-RING  РОЗ
JOINT BASE  MASTER
(HOUSING  INDEX
SIDE)  P02
P05
CONNECTING
TUBE
P09
AGB HOUSING  SUPPORT  CENTERING
PLATE  PIN
P10  P14
INSERT
P16
S-M56-SB-04508-00-B
Impingement Test of the Oil Nozzle on the Starter Drive Pad (Typical)
Figure 5, Sheet 1 of 3
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 40

### Page 41 (OCR)

(cim  SERVICE
BULLETIN
THE POWER  CFM56-3
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
DETAIL A
THREADED  NUT P15
ROD P13
FIXING
GUIDE
HEXAGONAL
NUT
P15
(4 LOCATIONS)
THREADED
ROD
CONNECTING  P13
TUBE  (4 LOCATIONS)
P09
S-M56-SB-04509-00-B
Impingement Test of the Oil Nozzle on the Starter Drive Pad (Typical)
Figure 5, Sheet 2 of 3
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 41

### Page 42 (OCR)

(cim  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
RESTRICTOR NIPPLE
335-308-500-0
S-M56-SB-04510-00-B
Impingement Test of the Oil Nozzle on the Starter Drive Pad (Typical)
Figure 5, Sheet 3 of 3
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 42

### Page 43 (OCR)

(cim)  SERVICE
BULLETIN
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
SECTION FF
OIL SEAL ASSY
335-317-805-0
OIL SEAL
SUBASSY
335-320-403-0
O-RING
335-324-301-0
MATING RING  OIL SEAL
335-317-702-0  335-324-202-0
S-M56-SB-04489-00-B
New Oil Seal Assy
Figure 6
CFM56-3/3B/3C S/B 72-1129
March 09, 2011  PAGE 43

### Page 44 (OCR)

cfm  SERVICE
BULLETIN
THE POWER  CFM56-3
OF FLIGHT
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
SCREW
NUT  P11
P08
FLAT WASHER
SCREW  P12
P20
KNERLED
GRIP  P19
P16
ANTI-ROTATION KEY
DOWEL PIN  P06
P21
SHEATH  GUIDE AXIS
P18
P17
EXPANDER  CENTERING GUIDE
P05  P09
SLEEVE SIDE  PERFORMED PAKING
WINDOW  O-RING
P14
STATER DRIVE
PAD ASSY
MATING
BALL BEARING  RING
INNER RACE
62 TOOTH
GEARSHAFT
S-M56-SB-04490-00-B
Installation of the Mating Ring of the New Oil Seal Assy with Tool 856A2971G02
Figure 7
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 44

### Page 45 (OCR)

cim  SERVICE
BULLETIN
THE POWEE  CFM56-3
ST TLIGH
ENGINE - General (72-00-00) - Introduction of a New Accessory Gearbox Assembly (AGB) with a New
Starter Drive Pad and New Handcranking Cover and Rework of Old AGB to the New One
OLD CONFIGURATION
SECTION AA
HANDCRANKING
COVER ASSY
335-322-802-0  CABLE
335-322-901-0
HANDCRANKING COVER
335-309-604-0
NEW CONFIGURATION
HANDCRANKING
SECTION AA  VIEW B
COVER ASSY
335-322-806-0
CAUTION
MOY FORET BL  DE QUES  CABLE  REQUES  FORGET S
335-322-902-0
HANDCRANKING
COVER
335-309-605-0
S-M56-SB-04491-00-B
Old and New Configuration of the Handcranking Cover Assy
Figure 8
CFM56-3/3B/ЗC S/B 72-1129
March 09, 2011  PAGE 45

### Page 46

ENGINE-General(72-00-00)-IntroductionofaNewAccessoryGearboxAssembly(AGB)withaNew
StarterDrivePadandNewHandcrankingCoverandReworkofOldAGBtotheNewOne
4. A-PARTSPROGRESSIONCHART
Part Number
Part Name
and/or
Characteristics
Identi/g191ed by
ServiceBulletinNo.
335-300-103-0 Gearbox Assy Accessory Baseline
335-300-105-0 Gearbox Assy Accessory 72-0008
335-300-106-0 Gearbox Assy Accessory 72-0048
335-300-107-0 Gearbox Assy Accessory 72-0254
335-300-108-0 Gearbox Assy Accessory 72-0290
335-300-109-0 Gearbox Assy Accessory 72-0407
335-300-110-0 Gearbox Assy Accessory 72-0500
335-300-112-0 Gearbox Assy Accessory 72-1129
335-322-601-0 Cover baseline
335-322-602-0 Cover 72-0155
335-322-801-0 Cover - Assy 72-0500
335-322-802-0 Cover - Assy 72-0888
335-322-803-0 Cover - Assy 72-0889
335-322-603-0 Cover 72-0500
335-322-806-0 Cover - Assy 72-1129
335-300-801-0 Pad Assy - Drive Starter Baseline
335-300-802-0 Pad Assy - Drive Starter 72-0004
335-300-803-0 Pad Assy - Drive Starter 72-0155
335-300-807-0 Pad Assy - Drive Starter 72-1129
335-317-802-0 Seal Assy - Oil Baseline
DeletedbyS/B72-0155
335-317-805-0 Seal Assy - Oil 72-1129
CFM56-3/3B/3CS/B72-1129
March09,2011 PAGE 46

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.