Service difficulty report · Armature

Difficulty date
March 15, 2013
Submitted
March 22, 2013
Operation
General aviation
Part
Armature
Part number
230851507
Part serial
P1198
Condition
Damaged
Location
Starter Gen
Part time
2,263 hours
Component
Start Generator
Component part number
23085031
Stage of operation
IN
How discovered
V
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

STARTER GENERATOR WAS RECEIVED FOR O/H DUE TO "BAD BEARING". DURING DISASSEMBLY FOUND THE ARMATURE HAD BEEN DROPPED AND WAS DENTED AT THE COMMUTATOR END OF THE BALANCE BAND AREA. THE DRIVE END BEARING JOURNAL OF THE ARMATURE SHAFT WAS BADLY WORN, DUE TO THE SHAFT SPINNING INSIDE THE BEARING INNER RACE, BEARING WAS NOT SEIZED. CAUSE OF THE WEAR IS UNKNOWN. BEARINGS WERE NOT OEM PARTS BUT WERE PN EH03-6009-25. THE BEARING RETAINER SCREWS WERE INCORRECT. FLAT WASHERS WERE ALSO MISSING ON THE COMMUTATOR END BELL BOLTS.