What happened
During the initial climb phase after takeoff, the engine suddenly stopped and did not respond to attempts at restart. The pilot turned back toward the airport but was unable to reach the runway. The aircraft impacted large trees in a wooded area, then crashed to the ground and burned approximately half a mile from the airport.
The investigation
An engine teardown revealed that the center crankshaft bearing had seized. There was a crack in the engine case in the vicinity of the bearing's oil access port. Evidence indicated that oil had partially bypassed the bearing and flowed into the case. An acquaintance stated that on a previous occasion, the engine seized while the aircraft was being taxied. He further stated that the pilot added oil to the engine, rotated the propeller, restarted the engine, then flew the aircraft frequently thereafter. Acquaintances also said the pilot had overhauled the engine in mid-1986, although he was not certified as a mechanic. Additionally, the aircraft had been modified IAW STC SA45RM; however, no record was found concerning the overhaul or modification.
Findings
A check of the pilot's blood showed an alcohol level of 0.07%. The engine failure was attributed to the seizure of the center crankshaft bearing, likely due to improper maintenance and oil bypass caused by a cracked engine case.