Service difficulty report · Brushes

Difficulty date
September 22, 2005
Submitted
October 3, 2005
Operation
General aviation
Part
Brushes
Part number
M230881320
Condition
Defective
Location
Starter Gen
Component
Starter Gen · Lucas
Component part number
23048
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

BRUSHES FROM LOT MC20987 BATCH 072905 APPEAR TO HAVE A HIGHER THAN NORMAL RESISTANCE. THE NOTICEABLE SYMPTOMS ARE SURFACE BLUING OF THE ARMATURE COMMENTATOR, EXCESSIVE CURRENT DRAW AND INCREASED FIELD FRAME TEMPERATURE DURING BRUSH RUN IN ON THE STARTER GENERATOR. THESE BRUSHES HAVE BEEN RETURNED TO MIRAJ CORPORATION FOR EVALUATION OF THE CARBON GRADE PROPERTIES. A FINDINGS REPORT HAS BEEN REQUESTED.