On May 8, 1994, a Hiller UH-12B (registration N6417V) was involved in an aviation accident near Crystal Beach, TX. Investigators recorded the probable cause as: THE PILOT'S IMPROPER AUTOROTATION TOUCHDOWN, WHICH RSULTED IN THE HARD LANDING. A FACTOR WAS THE POWER LOSS DUE TO WATER CONTAMINATED FUEL. This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.
A helicopter experienced a partial engine power loss during initial climb. The pilot turned downwind and attempted to maneuver into wind at low altitude, resulting in a hard, sideways landing. The helicopter rolled onto its left side. Investigation found no mechanical failure but water-contaminated fuel.
Accident Overview
A helicopter suffered a partial loss of engine power during the initial climb after takeoff. The pilot assessed that landing straight ahead would pose a hazard and instead chose to turn downwind and attempt to maneuver back into the wind at a low altitude.
Landing and Rollover
During touchdown, the helicopter landed hard, touched down sideways, rocked on its skids, and subsequently rolled onto its left side.
Investigation Findings
Examination of the engine and its accessories revealed no evidence of pre-accident mechanical failure or malfunction. However, analysis of fuel samples taken from the system indicated contamination with water.