Aviation Accident Summary CHI89DEP04

WATERFORD, WI, USA

Aircraft #1

N3829

HILLER UH-12E

Analysis

WHILE IN NORMAL CRUISE FLIGHT THE HELICOPTER EXPERIENCED A VIBRATION. THE PILOT ELECTED TO MAKE A PRECAUTIONARY LANDING AND DURING ATTEMPTED AUTOROTATION CONTROL WAS LOST. THE INVESTIGATION REVEALED THE MAIN ROTOR DRIVE TRAIN TORSIONAL COUPLING HAD FAILED.

Probable Cause and Findings

THE PILOT'S INABILITY TO MAINTAIN CONTROL DURING AN AUTOROTATIONAL LANDING ATTEMPT FOLLOWING THE FAILURE OF THE MAIN ROTOR DRIVE TRAIN TORSIONAL COUPLING.

 

Source: NTSB Aviation Accident Database

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