ASN Wikibase Occurrence # 309992
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| Date: | Sunday 19 May 2013 |
| Time: | 12:10 LT |
| Type: |  Boeing 747-409F |
| Owner/operator: | China Airlines Ltd. |
| Registration: | B-18701 |
| MSN: | 30759/1249 |
| Year of manufacture: | 2000 |
| Total airframe hrs: | 57335 hours |
| Engine model: | General Electric CF6-80C2B1F |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Atlanta, Georgia -
 United States of America
|
| Phase: | Approach |
| Nature: | Cargo |
| Departure airport: | Anchorage-Ted Stevens International Airport, AK (ANC/PANC) |
| Atlanta Hartsfield-Jackson International Airport, GA (ATL/KATL) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane experienced a partial separation of the right inboard foreflap during approach to the airport after the crew selected flaps 30. The crew performed a go-around and landed uneventfully. Examination of the outboard fitting that attaches the right inboard foreflap to the sequence carriage revealed a fracture in the lug. A portion of the fracture had a slow growth region consistent with fatigue that caused the lug to fail under normal flight conditions. The failure of the lug resulted in a skewed condition of the right inboard foreflap and subsequent partial separation of the foreflap. Examination of the sequence carriages for both the right and left inboard foreflaps revealed several discrepancies with the bearings including incompatible parts, flat spots, play, binding, and roughness of operation.
Due to several other prior events, the manufacturer previously recommended specific maintenance tasks on the foreflaps and the FAA issued an airworthiness directive for mandatory inspections. A review of the airplane's maintenance records revealed that the foreflap components had been inspected or lubricated three times in the preceding six months, the most recent occurring two weeks prior to the incident. The records showed that the airplane was in compliance with all required and recommended maintenance practices for the flaps. However, maintenance personnel failed to notice the fatigue cracking in the lug and the anomalies with the bearings on the sequence carriages during the dedicated foreflap maintenance tasks.
Probable Cause: Failure of the right inboard foreflap outboard fitting due to fatigue and bearing anomalies on the sequence carriages which resulted in the partial separation of the right inboard foreflap. Contributing to the incident was the failure of maintenance personnel to detect the fatigue cracking and bearing anomalies during dedicated inspections.
Accident investigation:
 |
|
Sources:
NTSB ENG13IA027
History of this aircraft
Other occurrences involving this aircraft
| 25 February 2013 | B-18701 | China Airlines | 0 | Dallas, Texas | |
min |
| Inflight smoke | ||||||
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Apr-2023 16:11 | ASN Update Bot | Added |
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