SUNBURY, PA, USA
N6741S
Cessna 150H
The pilot reported that the engine lost power while climbing through 2200 msl. He stated that his attempts to restart the engine, using the emergency procedures, were unsuccessful. During a forced landing in a field, the airplane struck a rock and nosed over. The airplane was examined after the accident by an FAA inspector. The examination revealed that the four bolts that held the crankshaft cluster gear to the crankshaft had failed. The accessory gear box cover was removed and the cluster gear rotated freely. Examination of the four bolts revealed that one of the bolts failed due to fatigue in the threaded area. (Due to smearing, failure mode of the the other 3 bolts was not determined). The engine had over 356 hours since overhaul. The pilot stated that he was unsure why the prior owner had the engine overhauled.
On October 5, 1996, at about 1300 eastern daylight time (EDT), N6741S, a Cessna 150H, lost engine power and made a forced landing in a cornfield near Selinsgrove, Pennsylvania. The certificated commercial pilot, the sole occupant, reported no injuries. The airplane sustained substantial damage when it nosed over during the landing roll. Visual meteorological conditions prevailed and a flight plan was not filed. The personal flight originated in Selinsgrove, Pennsylvania, at 1250 EDT. The destination was Shamokin, Pennsylvania. The pilot reported that about 10 minutes after departure as the airplane was climbing through 2200 feet msl, the engine lost power. His attempts to restart the engine using the emergency procedures were unsuccessful. He stated that he made a forced landing in a farmers field, and during the landing the airplane nosed over. The airplane was examined after the accident by a Federal Aviation Administration Safety Inspector. The Inspector stated that the examination revealed that the four bolts that hold the crankshaft cluster gear to the crankshaft were missing. The accessory gear box cover was removed and the cluster gear rotated freely. The Inspector stated that the bolts were removed and it was revealed that one of the bolts failed due to fatigue in the threaded area. According to the Inspector the engine had over 356 hours since overhaul, and the pilot/owner reported that the prior owner had the engine overhauled prior to his purchase.
failure of the cluster gear attaching bolts (of which one failed from fatigue), resulting in a disconnect of the gear and loss of engine power. An obstruction (rock) in the emergency landing area was a related factor.
Source: NTSB Aviation Accident Database
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