Incident Overview
Approximately ten minutes into the flight, the pilot observed a loss of engine oil pressure accompanied by a high engine oil temperature. Shortly thereafter, the engine lost power. The pilot initiated an autorotation in an attempt to execute a forced landing. During the descent, the helicopter collided with high tension wires and subsequently fell to the ground.
Maintenance History
According to the Director of Aircraft Maintenance, a 50-hour inspection had been completed on the helicopter on 7/05/96. This inspection included an oil change and the removal of the oil pressure screen housing for inspection. Maintenance personnel had noted a small puddle of oil on the ramp at the location where the helicopter began its departure.
Investigation Findings
An examination of the helicopter revealed that the engine oil pressure screen housing was loose. This condition likely allowed oil to escape, leading to the observed oil pressure and temperature anomalies and ultimately to the engine power loss.
Probable Cause
The loose engine oil pressure screen housing was the stated cause of the accident.