Aviation Accident Summary LAX89DVM02

SALINAS, CA, USA

Aircraft #1

N169HA

HILLER UH-12E

Analysis

DURING AN AERIAL APPLICATION FLIGHT, THE ENGINE RPM INCREASED AND THE ROTOR RPM DECREASED. THE PILOT AUTOROTATED TO AN OPEN FIELD WHERE AFTER TOUCHDOWN, THE MAIN ROTOR BLADES SEVERED THE TAIL BOOM. INSPECTION OF THE ENGINE REVEALED THAT THE TORSION COUPLING WAS SEPARATED IN THE MAIN ROTOR DRIVE SYSTEM.

Probable Cause and Findings

THE SEPARATION OF THE TORSION COUPLING IN THE MAIN ROTOR DRIVE SYSTEM.

 

Source: NTSB Aviation Accident Database

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