Service difficulty report · Solenoid · Cessna 172N

Difficulty date
April 24, 2003
Submitted
May 20, 2003
Operation
General aviation
Aircraft
N737BC
Make and model
Cessna 172N
Aircraft serial
17269283
Engine
Lyc O320H2AD
Propeller
Mcauly 1C160DTM
Part
Solenoid
Part number
S1991A1
Condition
Inoperative
Location
Starter
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

FOURTH INCIDENT INVOLVING THIS SAME STARTER SOLENOID INTAILING SHORTING OUT INTERNAL WINDING CAUSING STARTER TO MALFUNCTION. THE FORMER THREE OCCASIONS, THE STARTER FAILED TO ROTATE (SOLENOID STUCK IN THE OPEN POSITION) ON THIS OCCASION, STARTER TURNED AS SOON AS THE MASTER WAS TURNED ON ( SOLENOID STUCK IN CLOSED POSITION). ON THIS OCCASION, THE BATTERY WAS NOT FULLY CHARGED AND CAUSED A HIGH CURRENT DRAW TO THE STARTER. A DICECTEDED SOLENOID REVELED SHORTED WINDINGS. THIS SWITCH WAS IN OPERATION NOT MORE THAN 6 MONTHS.

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