NTSB Identification: CEN11LA200
14 CFR Part 133: Rotorcraft Ext. Load
Accident occurred Wednesday, February 23, 2011 in Henryetta, OK
Probable Cause Approval Date: 08/22/2011
Aircraft: HUGHES 369D, registration: N112AS
Injuries: 1 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 helicopter was facing into the wind and hovering, with an external load, over an open field adjacent to the work area. The pilot made a 180-degree right pedal turn to enter the work area, approximately 120 feet above the ground. While trimming for the left quartering tailwind, he heard a loud "pop" and felt a "thump" in his seat. He was unable move the cyclic control to the left, and the helicopter started a right banking turn. The helicopter rolled sharply to the right and impacted the ground. A postaccident examination of the helicopter revealed no discrepancies. Flight control continuity was established from the cockpit to the flight controls. When the flight controls were manipulated, no obstructions or binding were noted.

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

Failure of the cyclic control system for reasons undetermined.

Full narrative available

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