SDR JBZA201210261003

Service difficulty report · Stud · Cessna 421C

Difficulty date: October 23, 2012
Submitted: October 26, 2012
Operation: Air carrier
Aircraft: N56RX
Make and model: Cessna 421C
Aircraft serial: 421C0207
Aircraft time: 11,032 hours
Engine: Cont GTSIO520F
Engine time: 10,683 hours
System (JASC): 8520 · Reciprocating Engine Power Section
Part: Stud
Condition: Broken
Location: Crankcase
Part time: 10,683 hours
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

DURING AMT TROUBLESHOOTING OF THE NR 1 ENGINE ALTERNATOR INTERMITTENT, DISCOVERED CRANKCASE STUDS BROKEN, UNRELATED TO THE ALTERNATOR ISSUE, INITIATED THE DISASSEMBLY AND REMOVED CYLINDER, ALL NON-DESTRUCTIVE TESTING CHECKS OK, REPLACING THE STUDS, ALSO REPLACING BROKEN TERMINAL AT THE ALTERNATOR TO FIX THE ALTERNATOR ISSUE.

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