Service difficulty report · Starter Gen

Difficulty date
September 3, 2010
Submitted
September 17, 2010
Operation
General aviation
Part
Starter Gen
Part number
23080050
Part serial
99638
Condition
Misoverhauled
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

(NE2R) DURING DISASSEMBLY OF THIS STARTER GENERATOR FOR AN O/H EVALUATION, IT WAS DISCOVERED THAT THE STATOR HAD BEEN SATURATED WITH "GLYPTOL" WHICH IS "STRICTLY PROHIBITED" BY THE CURRENT 23080 SERIES II CMM. THE CMM STATES THAT STATORS COATED WITH "GLYPTOL" MUST BE REPLACED PRIOR TO RETURNING THE UNIT TO SERVICE. THE ARMATURE BALANCE BANDS WERE CUT TOO DEEPLY IN A NR OF AREAS AND THE ARMATURE BRG JOURNALS MEASURED BELOW THE ALLOWED TOLERANCE BEFORE CUTTING AND CLEANING. BRG LINERS OF THE END BELLS MEASURED LARGER THAN THE ALLOWED TOLERANCE. THE SPUR GEAR HAD SOME CHIPPED TEETH. OUT CUSTOMER STATED THAT THIS WAS A "FAIRLY RECENT" O/H (BY ANOTHER FACILITY) AND QUESTIONED WHY THE ESTIMATED COST OF THE O/H WAS SO HIGH.