On November 22, 2004, a Schweizer 269C (registration N45012) operated by Western Operations, Inc. was involved in an aviation accident near Rialto, CA. Investigators recorded the probable cause as: the pilot's failure to maintain adequate rotor rpm and altitude/clearance during the takeoff initial climb. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive; 1 related events involving the same aircraft type or operator are linked below.
A helicopter collided with terrain during a pinnacle departure attempt after rotor rpm decreased and could not be recovered. The engine showed no pre-accident anomalies.
Accident Details
The helicopter collided with terrain during a pinnacle departure attempt. After departing, the pilot configured the helicopter into a hover about 3 feet above ground level and verified that the cockpit gauges displayed appropriate indications. In an attempt to depart the area, the pilot stated he "began to trade altitude for airspeed" while maneuvering in a right turn toward his planned escape route, which consisted of downsloping terrain. While in the turn, rotor rpm became low, and the pilot manipulated the throttle control for full power while simultaneously lowering the collective. Despite these attempts, rotor rpm failed to increase, and the helicopter continued to descend. In an effort to cushion the impact, the pilot raised the collective just before the skids contacted terrain. The helicopter rolled downhill and came to rest on its left side.
Engine Examination
The engine manufacturer performed an engine test run. No discrepancies or anomalies were found that would indicate the engine was not capable of producing power prior to the mishap.