Aviation Accident Summaries

Aviation Accident Summary DEN93FA033

APPLEGATE, OR, USA

Aircraft #1

N5344V

HILLER UH-12E

Analysis

THE HELICOPTER LANDED ON A MOUNTAINSIDE HELIPAD WHERE TWO PASSENGERS WERE WAITING. THE PILOT OF A SIKORSKY S 61 HELICOPTER FLYING NEARBY CAUTIONED HIM ABOUT CLOUDS MOVING UP THE VALLEY. HE ALSO NOTED IT WAS QUITE WINDY AND TURBULENT. THE PILOT REPLIED HE WAS AWARE OF THE APPROACHING CLOUDS AND THAT IT WAS BAD. SHORTLY THEREAFTER, THE SIKORSKY PILOT HEARD THE HILLER PILOT SAY, I LOST IT. THE MAIN ROTOR BLADES AND ONE PADDLE WERE FOUND IN CLOSE PROXIMITY TO THE HELICOPTER; THE OTHER PADDLE WAS LOCATED 300 FEET AWAY. EXAMINATION OF THE MAIN ROTOR HEAD DISCLOSED DAMAGE BETWEEN THE HUB STATIC STOPS AND THE MAIN ROTOR MAST. METALLURGICAL EXAMINATION OF THE FRACTURED SURFACES INDICATED ALL THE BREAKS WERE THE RESULT OF OVERLOAD FORCES.

Probable Cause and Findings

THE PILOT INITIATING FLIGHT INTO KNOWN ADVERSE WEATHER. FACTORS WERE: LOW CEILING, FOG, AND TURBULENCE.

 

Source: NTSB Aviation Accident Database

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