Service difficulty report · Bearing · Bell 407

Difficulty date
July 27, 2015
Submitted
July 27, 2015
Operation
General aviation
Aircraft
N9KH
Make and model
Bell 407
Aircraft serial
54341
Aircraft time
413 hours
Engine
Allsn 250C47B
Engine time
413 hours, 392 cycles
Part
Bearing
Part number
6895007
Part serial
NWM110003
Condition
Failed
Location
Torquemeter
Part time
413 hours, 392 cycles
Component
Gearbox · Rroyce
Component part number
23063393
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

METAL FOUND DURING INSPECTION ON BOTH ENGINE CHIP DETECTORS. ENGINE REMOVED AND SENT TO APPROVED MFG FACILITY. TORQUE METER BEARING FOUND TO BE PRIMARY CASUE OF METAL IN OIL. DURING INSPECTION FOUND NR 3 TURBINE WHEEL FAILED INSPECTION AND WAS REPLACED. NUMBEROUS OTHER BEARINGS AND OTHER PARTS WERE REWORKED OR REPLACED INCLUDING 2.5 BEARING, COMPRESSOR NR 1 & NR 2 BEARINGS, NR 2 TURBINE WHEEL, NR 5, NR 6, NR 7 BEARINGS & GP LABYRINTH SEAL.

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