OPA-LOCKA, FL, USA
N70659
PIPER J3C-65
DURING NORMAL CRUISE FLT, THE PLT REPORTED THAT THE RPM WAS DECREASING & THE OIL TEMPERATURE WAS INCREASING. THE ENG THEN SEIZED. WITH POOR FWD VISIBILITY DUE TO OIL COVERING THE WINDSCREEN, HE OVERSHOT THE FIELD HE WAS ATTEMPTING TO LAND IN. THE ACFT COLLIDED WITH A FENCE THEN NOSED OVER. EXAM OF THE ENG REVEALED THAT THE NUMBER 3 CYLINDER CONNECTING ROD END CAP SEPARATED, EXISTED THE CASE & CAME TO REST IN THE OIL SUMP. LYCOMING ENG PERSONNEL STATED THAT THE SEPARATION OF THE ROD CAP WAS DUE TO A LACK OF LUBRICATION WHICH CAUSED THE ROD BOLTS TO STRETCH, LOSING THEIR TORQUE, & ONE OF THE TWO NUTS VIBRATED OFF. THE OTHER ROD BOLT FAILED DUE TO OVERLOAD. THE ENG RECEIVED A TOP OVERHAUL 136 HRS EARLIER & A MAJOR OVERHAUL WAS PERFORMED 2,122 HRS EARLIER. NO DETERMINATION COULD BE MADE AS TO THE REASON FOR THE LACK OF LUBRICATION.
ENGINE FAILURE DUE TO LACK OF OIL SUPPLY TO THE NUMBER 3 CYLINDER CONNECTING ROD FOR UNDETERMINED REASONS. THIS ALLOWED THE CONNECTING ROD END CAP TO SEPARATE THROUGH THE CASE RESULTING IN OIL EXHAUSTION.
Source: NTSB Aviation Accident Database
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