NTSB Identification: LAX95LA238.
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Accident occurred Monday, July 03, 1995 in RIO VISTA, CA
Probable Cause Approval Date: 01/29/1996
Aircraft: Hiller UH-12C, registration: N1348Z
Injuries: 2 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 INSTRUCTOR WAS PERFORMING A LOW RPM RECOVERY WHEN THE AIRCRAFT BEGAN AN UNCOMMANDED YAW TO THE RIGHT. HE ATTEMPTED TO CONTROL THE AIRCRAFT BY APPLYING FULL LEFT ANTI-TORQUE PEDAL, BUT IT HAD NO EFFECT ON THE YAW. HE LOWERED COLLECTIVE AND THE AIRCRAFT TOUCHED DOWN HARD, REBOUNDED, AND CONTINUED TO YAW RIGHT. HE APPLIED LEFT CYCLIC AND ROLLED OFF THE THROTTLE AND TOUCHED DOWN AGAIN. AN INSPECTION REVEALED THAT THE LEFT ANTI-TORQUE CONTROL CABLE HAD SEPARATED. A LABORATORY EXAMINATION REVEALED THAT FAILURE WAS DUE TO SEVERE WEAR. THE CABLE HAD CHAFED NEAR THE BOTTOM OF THE STARTER. THE CABLE WAS IN AN AREA THAT COULD BE INSPECTED DURING A PREFLIGHT INSPECTION OF THE AIRCRAFT.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

The result of a chafing failure of the left anti-torque control cable while the aircraft was in flight. An inadequate preflight inspection by the pilot-in-command, and an inadequate 100-hour inspection by company maintenance personnel were factors in this accident.

Full narrative available

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