N5133J
Operators of this aircraft
Who operated this tail, and how firmly we know it.
No operator established for this aircraft.
Accident & incident history
Maintenance disclosures
DURING THE COURSE OF NORMAL FLIGHT, THE PILOT NOTICED THE RIGHT TACHOMETER HAD QUIT OPERATING. IT WAS DETERMINED THE DOWEL PIN (TCM PART 535634) ON THE OIL PUMP SHAFT GEAR (TCM PART 631075) THAT DRIVES THE TACHOMETER GENERATOR WAS SHEARED. SHORTLY AFTER THE SHAFT GEAR/DOWEL PIN ASSEMBLY WAS REPLACED, THE SHAFT ON THE TACHOMETER GENERATOR SHEARED. IT IS SUSPECTED THE TACHOMETER GENERATOR HAD TEMPORARILY FAILED CAUSING THE POSSIBLY WEAKENED DOWEL PIN TO SHEAR RATHER THAN THE TACHOMETER GENERATOR SHAFT.
DURING A 100-HOUR INSPECTION, MECHANIC NOTICED UPPER RIGHT (MOST AFT) STUD WAS BROKEN ON THE NR 4 CYLINDER PAD. THE STUD WAS BROKEN FLUSH WITH CYLINDER BASE. SUBMITTER SUSPECTS TIME IN SERVICE IS THE MAIN CAUSE FOR BREAKAGE OF THIS STUD. THERE IS NO WAY TO DETERMINE THE TOTAL TIME OF THIS STUD, OR THE CRANKCASE DUE TO A REMOVABLE DATA PLATE. WHILE THE NEWER CRANKCASES INCORPORATE A 7TH STUD, THE OLDER CASES RELY ON THE EXISITNG STUDS TO RETAIN THE CYLINDERS AND SHOULD BE REPLACED AT EACH OVERHAUL. SUBMITTER SUGGESTS THE MANUFACTURER (TCM) BE REQUIRED TO STAMP ITS CASES TO BETTER ENABLE TOTAL TIME TRACTABILITY.
DURING A 100-HOUR INSPECTION, MECHANIC HAD REMOVED THE NR 5 CYLINDER TO REPLACE A BROKEN STUD AND NOTICED CYLINDER HAD BEEN CHAFING. A CLOSER INSPECTION REVEALED THE CRANKCASE WAS CRACKED ON THE CYLINDER MOUNT PAD AROUND THE LOWER RIGHT STUD. ONE CRACK RAN INSIDE THE STUD AREA TOWARDS THE CYLINDER SKIRT, AND ANOTHER CRACK RAN OUT FROM THE SAME STUD IN THE DOWNWARD DIRECTION. SUBMITTER SUSPECTS THE BROKEN STUD CAUSED CYLINDER TO BECOME LOOSE CAUSING CHAFING AND, ULTIMATELY, CASE TO CRACK. SUBMITTER SUGGESTS MFG (TCM) BE REQUIRED TO STAMP ITS CASES TO BETTER ENABLE TOTAL TIME TRACTABILITY.