NTSB Identification: IAD03TA003.
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Accident occurred Wednesday, October 09, 2002 in Cleveland, OH
Probable Cause Approval Date: 09/01/2004
Aircraft: Beech A200, registration: N200NG
Injuries: 1 Minor,3 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.
After takeoff, the right main landing gear would not retract. The crew attempted to troubleshoot the malfunction and tried to hand-pump the landing gear down, but were not successful. The captain made a landing to test the landing gear, but when it wouldn't hold, he aborted the landing. The captain made a subsequent landing and shut down the engines. As the airplane decelerated through 80 knots, the right main landing gear collapsed. After the accident, the airplane was placed on jacks, and when the gear handle was placed in either the up or down position, the landing gear motor rotated the torque tubes out to both main landing gear actuators, but the right main landing gear would not extend or retract. The right main landing gear actuator was forwarded to the airplane manufacturer for further examination. According to a company metallurgist's report, there was a fracture of the actuator housing inboard pivot hub flange, and a fracture through the shaft section of the pinion gear. Examination of internal components revealed fractures to most of the ring gear teeth, and a segment of metal was separated from a pinion gear tooth. Microscopic examination of ring gear fracture surfaces revealed arrest lines, "representative of progressive fracture." Metalographic examination of a polished and etched cross section of gear tooth revealed crack arrest lines, "again indicating cyclic progression of crack growth." Microscopic examination of ring gear tooth profile surfaces revealed "excessive polishing of the tooth faces, together with rounding of the tooth corners...typically representative of high tooth loads created by inadequate operating clearance between the ring gear and pinion gear."
The National Transportation Safety Board determines the probable cause(s) of this accident to be: Inadequate operating clearance between the ring gear and pinion gear during the manufacturing process resulting in the failure of the landing gear actuator gear ring. Full narrative available
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