BHT-429-MPI
Table1.ConditionalInspections-Overtorque(continued)
INITIAL
DATAREFERENCEINSPECTIONTASKDESCRIPTION
MECHOTHER
BHT-429-FM-1,Section2
2.Starttheenginesanddoaone-hourgroundrun(100%rotorRPM
(N
R
)).
3.Visuallyexaminethetransmissionandengineoilsystemsandthefuel
systemforleakage.
4.Visuallyexaminethechipdetectorsofthetransmissionassembly
andtailrotorgearboxforcontamination.Iftherearenounwanted
particles,themainrotorandtaildrivesystemsareserviceable.Ifthere
areunwantedparticlesonachipdetector,dothefollowing:
429-MM,Chapter63
429-MM,Chapter65
a.Removethetransmissionassemblyorthetailrotorgearbox,as
applicable.
b.AttachaTHISCOMPONENTWASREMOVEDFROMSERVICE
BECAUSEOFANOVERTORQUEtagonthetransmissionassemblyor
tailrotorgearbox,asapplicable.
c.Sendthetransmissionassemblyortailrotorgearboxtoanapproved
repairfacilitytodisassemble,clean,anddoadetailedinspectionofthe
transmissionassemblyortailrotorgearbox,asapplicable.
5.Iftherearenounwantedparticles,thetransmissionassemblyandthe
tailrotorgearboxareserviceable.
6.Returnthehelicoptertoservice.
OVERTORQUE-ABOVE120%
NOTE
Followtheinstructionsasapplicableperassembly.Usethewear,
damage,andrepairlimitsandotherapplicabledata.Makesure
thatthepartsineachassemblyarewithinthedimensionlimitsand
thattheyhavenotyieldedorbecomedeformed.
Ifanovertorquehasexceeded120%,dothefollowing:
1.Removethefollowingcomponents:
429-MM,Chapter62
•Mainrotorhubassembly
429-MM,Chapter63
•Mastassembly
•Transmissionassembly
2.AttachaTHISCOMPONENTWASREMOVEDFROMSERVICE
BECAUSEOFANOVERTORQUEtagonthemainrotorhubassembly,
mastassembly,andtransmissionassembly.
429-MM,Chapter62
3.Disassemble,clean,anddoadetailedinspectionofthemainrotor
hubassembly.
429-MM,Chapter634.Disassemble,clean,anddoadetailedinspectionofthemastassembly.
5.Sendthetransmissionassemblytoanapprovedrepairfacilityto
disassemble,clean,anddoaNDTinspectionofthetransmissiontop
caseassembly.
6.Visuallyexaminetheothercomponentsthatarelistedinthe
inspectionsfollowinganovertorqueof111to120%.
429-A-05-50-00-04A-284A-AApplicableto:ALL
Page4Issue1-10JAN2019
ECCNEAR99
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