NTSB Identification: FTW82IA268
14 CFR Part 91: General Aviation
Incident occurred Saturday, July 03, 1982 in NEAR MERTZON, TX
Probable Cause Approval Date: 07/03/1983
Aircraft: BELL 47G2A1, registration: N73983
Injuries: 2 Uninjured.

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

WHILE THE AIRCRAFT WAS BEING HOVERED LOW AND SLOW AROUND A WATER TROUGH, DIRECTIONAL CONTROL WAS LOST. THE PILOT AUTOROTATED TO THE GROUND AND ON TOUCHDOWN THE RIGHT SKID BUCKLED AND THE TAILROTOR GEARBOX SEPARATED WHEN IT STRUCK AN ANT HILL. THE PILOT ORIGINALLY REPORTED THAT ONE OF THE TAILROTOR BLADES HAD SEPARATED IN WHAT APPEARED TO BE FATIGUE. HOWEVER METALLURGICAL EXAMINATION OF THE FAILED PARTS INDICATED THAT ALL OF THE FRACTURES HAD OCCURED IN OVERLOAD. THE REPORTED WINDS WOULD HAVE BEEN CONDUCIVE TO LOSS OF TAILROTOR EFFECTIVENESS AT LOWER AIRSPEEDS.

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

DIRECTIONAL CONTROL..NOT MAINTAINED..PILOT IN COMMAND

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

WIND INFORMATION..DISREGARDED..PILOT IN COMMAND

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

PROPER DESCENT RATE..NOT OBTAINED..PILOT IN COMMAND


Contributing Factors

WEATHER CONDITION..UNFAVORABLE WIND

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