NTSB Identification: CEN12LA650
14 CFR Part 91: General Aviation
Accident occurred Wednesday, September 19, 2012 in Rio Vista, TX
Probable Cause Approval Date: 06/04/2013
Aircraft: HILLER UH-12B, registration: N94735
Injuries: 1 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The pilot reported that he was on a survey flight when the helicopter engine suddenly stopped; he elected to autorotate to a field. The area he landed in had high vegetation, which “grabbed” the helicopter skids and the helicopter impacted the ground hard. Examination of the helicopter revealed that the main rotor impacted the tailboom during the accident and the tail rotor had separated from the helicopter. Examination of the engine revealed the No. 6 piston had disintegrated catastrophically, which caused additional internal damage to the engine.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The catastrophic failure and disintegration of the No. 6 engine piston, which resulted in a total loss of engine power. Full narrative available
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