Service difficulty report · Armature · Cessna 152

Difficulty date
December 21, 2010
Submitted
March 15, 2011
Operation
Air carrier
Make and model
Cessna 152
Engine
Lyc O235L2C
Propeller
Snsnch 72CCS6
Part
Armature
Condition
Burned
Location
Starter
Part time
193 hours
Stage of operation
TX
How discovered
O
Nature of condition
B
Precautionary procedure
E

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

What was found

THE BATTERY WAS THE INITIAL SNAG FROM THE PILOT. THE PLANES ELECTRONICS WEREN`T COMING ON. FUMES WERE COMING FROM THE OIL DOOR ON THE COWLING WHICH WAS THE BATTERY BEING BOILED OVER. FOUND BATTERY HAD PUKED ITS GUTS OUT. TLOOKED FOR CAUSE AND FOUND WHEN YOU ENGAGED THE STARTER IT WOULD NOT ENGAGE. RING GEAR AND FEEDER CABLE TO THE STARTER GOT VERY WARM. RELAYS WOULD STAY CLOSED AND BATTERY SHORTING ITS SELF OUT. STARTER SHORTED OUT INTERNALLY, WHICH CAUSED THE SOLENOID TO FUSE IT-SELF CLOSED AND DRAINING THE BATTERY COMPLETELY. PULLED THE REAR CASE OFF THE STARTER AND FOUND THAT THE COMMUTATOR AND ARMATURE WERE COMPLETELY MELTED.

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