Service difficulty report · Bearing · Beech 300BEECH

Difficulty date
August 10, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Beech 300BEECH
Aircraft time
2,169 hours
Engine
Pwa PT6A60A
Propeller
Hartzl HCB4MP3
Part
Bearing
Part number
03600918
Condition
Failed
Location
Starter Gen
Part time
830 hours
Stage of operation
NR
How discovered
O
Nature of condition
H, E
Precautionary procedure
O

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

What was found

(CAN) ACFT EXPERIENCED GENERATOR FAILURE ON NR 2 ENGINE AT 830.3 HRS TSO. OPERATOR SENT ST/GEN TO THIS AMO FOR INSPECTION. FOUND THE BEARING AT THE COMM END, ADE, HAD FAILED. CAGE HAD SEPARATED, AND THE OTBD CAGE AND SEAL WERE FOUND IN PIECES EMBEDDED IN THE STATOR WINDINGS NEAR THE BRUSH HOLDERS. INBD CAGE REMAINED IN 1 PIECE. WHEN THE CAGE FAILED TO CONTAIN THE BALLS THEY BUNCHED UP ON ONE SIDE OF THE INNER RACE ON THE ARMATURE SHAFT, AND THE ARMATURE WAS NO LONGER CENTERED. ARMATURE LAMINATIONS RUBBED ON THE STATOR POLES, DESTROYING BOTH MAJOR PARTS. THIS IS A PROBLEM WE SEE AND THE 23085-001 STARTER-GENERATOR, OEM IS AWARE.