NTSB Identification: LAX95TA171.
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Accident occurred Tuesday, April 25, 1995 in THERMAL, CA
Probable Cause Approval Date: 01/16/1996
Aircraft: BELL 206-L4, registration: N6197N
Injuries: 2 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this public aircraft accident report.

THE CFI WAS DEMONSTRATING A HOVERING AUTOROTATION TO TOUCHDOWN. THE HELICOPTER WAS EQUIPPED WITH FULL SKID SHOES, AND A QUARTERING HEADWIND OF 15 KNOTS, GUSTING TO 30 KNOTS, EXISTED. THE CFI APPLIED FULL UP COLLECTIVE TO CUSHION THE LANDING. THE TOUCHDOWN WAS SMOOTH, BUT THE HELICOPTER CAME TO AN ABRUPT STOP. WHEN THE CFI RETURNED TO THE PAD, HE NOTICED THAT THE TAILBOOM SKIN WAS WRINKLED. THE MANUFACTURER HAD ADDRESSED THE TAILBOOM WRINKLING IN AN OPERATIONAL SAFETY NOTICE (OSN) WHICH WAS INCORPORATED IN THE HELICOPTER FLIGHT MANUAL. THE OSN STATES THAT THE MAIN ROTOR BLADES RPM SHOULD NOT BE LESS THAN 70 PERCENT, AND THAT THE COLLECTIVE SHOULD BE IMMEDIATELY LOWERED ON TOUCHDOWN.

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

The CFI's failure to follow the flight manual procedures by using full up collective during an autorotation landing.

Full narrative available

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