NTSB Identification: CHI00LA296.
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Scheduled 14 CFR operation of SUN COUNTRY AIRLINES
Accident occurred Sunday, September 10, 2000 in MINNEAPOLIS, MN
Probable Cause Approval Date: 10/17/2001
Aircraft: Boeing 727-224, registration: N296SC
Injuries: 101 Uninjured.
NTSB investigators may have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
The Boeing 727-224 number 3 wheel assembly failed during taxi for takeoff and pieces of the wheel assembly impacted the airframe causing damage. Examination of the wheel assembly revealed a fatigue failure that emanated from a point at the inside diameter of one of the brake lugs. A circumferential scratch was found adjacent to the fatigue origin. The wheel half had been inspected by an approved repair station and shipped to the airline on July 21, 2000. The wheel was installed on the accident aircraft and had accumulated 356.2 hours time in service at the time of the accident. A review of repair station records revealed that the repair station had been rejecting about 4 wheel halves per month. Prior to the accident, the repair station was finding cracks on other wheel halves in the area where the wheel failure occurred. The repair station had been in contact with the wheel manufacturer concerning this matter and had sent representative wheel halves to the manufacturer for evaluation. In a conversation with a representative of the Federal Aviation Administration, the wheel manufacturer stated that one of the returned wheel halves had been examined and that a manufacturing defect had created a stress concentrator, which resulted in a fatigue failure of the wheel half. The wheel manufacturer issued a Service Bulletin to rework the lugs and to provide guidance in inspecting the affected areas of the wheel assembly.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: The fatigue failure of the wheel assembly. A factor was the inadequate inspection procedures prior to the issuance of a service bulletin. Full narrative available
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