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N2770 accident description

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Crash location Unknown
Nearest city Lubbock, TX
33.577863°N, 101.855166°W
Tail number N2770
Accident date 03 Sep 2001
Aircraft type Hiller UH-12D
Additional details: None

NTSB Factual Report

On September 3, 2001, at 1610 central daylight time, a Hiller UH-12D agricultural helicopter, N2770, was substantially damaged during a forced landing following a loss of directional control near Lubbock, Texas. The helicopter was registered to the pilot and operated by Aero Management, Inc., of Olton, Texas. The commercial pilot, sole occupant, was not injured. Visual meteorological conditions prevailed, and a flight plan was not filed for the 14 Code of Federal Regulations Part 137 aerial application flight. The local flight originated from the Town and Country Airpark Airport, Lubbock, Texas, at 1515.

The pilot reported to the FAA inspector that while spraying a cotton field, at 4 feet agl, he felt a vibration followed by a "pop" with a loss of tail rotor control. Subsequently, during the forced landing to the cotton field, the main rotor blades struck the tailboom separating it from the fuselage.

Examination of the helicopter by the FAA inspector, who responded to the accident site, revealed that a tail rotor drive shaft hanger bearing had failed, and the tail rotor drive shaft had separated.

NTSB Probable Cause

the failure of the tail rotor drive shaft hanger bearing, which resulted in the separation of the tail rotor drive shaft. A contributing factor was the lack of suitable terrain for the forced landing.

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