Helicopter Experiences Power Plant Failure After Oil Change (N46RJ)

Accident Overview

A helicopter experienced a complete power plant failure during its initial night flight after receiving an oil change and annual inspection. The pilot performed an autorotation, but the helicopter struck a building before coming to rest.

Investigation Findings

An inspection of the wreckage revealed that the engine failure resulted from oil starvation. Further investigation determined that the oil system had been adequately serviced; however, the drain valve had not been closed. Upon engine start and subsequent takeoff, the oil was pumped overboard, leading to the loss of engine power.

Sequence of Events

• The helicopter underwent an oil change and annual inspection.
• During the first flight after maintenance, which occurred at night, the engine lost all power.
• The pilot initiated an autorotation, but the aircraft collided with a building during the descent.
• Post-accident examination found the oil drain valve in the open position, confirming that the oil loss occurred during engine operation.