DUBLIN, NH, USA
N9310S
BEECH C23
THE PILOT WAS CRUISING AT 4500 FEET WHEN HE OBSERVED A LOW OIL PRESSURE INDICATION FOLLOWED BY A TOTAL LOSS OF ENGINE POWER. THE PILOT PERFORMED A FORCED LANDING ON AN OPEN FIELD, DURING WHICH THE NOSE GEAR COLLAPSED, AND THE FIREWALL BUCKLED. THE FAA INSPECTOR STATED THAT ALL PISTON PINS WERE REUSED AT LAST OVERHAUL, 121 HOURS PRIOR TO THE ACCIDENT. DURING POSTACCIDENT EXAMINATION, ALL PISTON PINS WERE FOUND TO BE BELOW SERVICE LIMITS. ADDITIONALLY, '...THE ENGINE FAILURE RESULTED FROM METAL PARTICLES GENERATED BY THE LOOSE FITTING PISTON PIN PLUGS, CAUSING PROGRESSIVE CONTAMINATION OF THE ENGINE LUBRICATION SYSTEM.'
On August 7, 1995, at 1920 eastern daylight time, a Beech C23, N9310S, sustained substantial damage during a forced landing in Dublin, New Hampshire. The private pilot was not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the personal flight which originated in Beverly, Massachusetts. The flight was conducted under 14 CFR Part 91. The pilot reported he was cruising at 4,500 feet, en route to Keene, New Hampshire. He observed a low oil pressure indication, which was followed shortly by a total loss of engine power. He initiated a forced landing to an open field. During the landing roll, the nosewheel collapsed. Postaccident examination by a Federal Aviation Administration (FAA) Inspector revealed that the firewall was buckled. The engine was examined by Textron Lycoming, Williamsport, Pennsylvania, under the supervision of an FAA Inspector. The FAA Inspector reported that all piston pins were polished and reused at the last overhaul, 121 hours prior to the accident. During the engine examination, all piston pins were found to be below the minimum service limits. He further stated: ...The engine failure resulted from metal particles generated by the loose fitting piston pin plugs, causing progressive contamination of the engine lubrication system. Lubrication system contamination resulted in reduced clearances in the connecting rod bearings, and subsequent failure due to over-heat distress. Failure of the number three connecting rod followed the bearing disintegration....
THE LOSS OF ENGINE POWER DUE TO IMPROPER MAJOR OVERHAUL OF THE ENGINE BY THE REUSE OF WORN PISTON PINS. THE ROUGH/ UNEVEN TERRAIN IN THE EMERGENCY LANDING AREA WAS A FACTOR.
Source: NTSB Aviation Accident Database
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