NTSB Identification: ATL02LA130.
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Accident occurred Tuesday, June 25, 2002 in Orlando, FL
Probable Cause Approval Date: 08/26/2003
Aircraft: Sikorsky S-55-QT, registration: N2300Z
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.

During a maintenance check flight of the helicopter, two auto-rotations at max gross weight with a neutral center of gravity were conducted. During the second maintenance check flight, on the initial run-up the pilot engaged the rotor clutch and heard a loud "bang". The cyclic control pulled from the pilot's hand, and the pilot rolled the throttle to ground idle to regain control the cyclic control. The helicopter rocked from left to right and rolled over on its side. Examination of the airframe found that the cyclic lateral control rod end bearing on the transmission fractured. Examination of the fractured surfaces showed features typical of overstress. No other mechanical or flight control malfunction was reported by the pilot.

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

Failure of the cyclic lateral control rod end bearing, and subsequent dynamic rollover.

Full narrative available

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