Service difficulty report · Bearing · Bell 407

Difficulty date
January 2, 2018
Submitted
March 13, 2018
Operation
General aviation
Aircraft
N874ST
Make and model
Bell 407
Aircraft serial
54494
Engine
Allsn 250C47B
Part
Bearing
Condition
Failed
Location
Engine
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

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

What was found

DURING A SCHEDULED AIRFRAME EVENT NR 3, AND ENGINE 150 HOUR INSPECTION, SIGNIFICANT METAL WAS FOUND ON BOTH ENGINE CHIP DETECTORS AND IN THE OIL SIDE OF THE CEFA FILTER ASSEMBLY. ENGINE WAS REMOVED AND SENT TO ENGINE SHOP FOR REPAIR. ENGINE WAS REINSTALLED AFTER REPAIRS. SEVERAL BEARINGS SHOWED SIGNS OF PREMATURE WEAR AND FAILURE.

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