ASN Wikibase Occurrence # 278966
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| Date: | Thursday 14 March 2019 |
| Time: | 17:30 LT |
| Type: |  Great Lakes 2T-1A-2 |
| Owner/operator: | |
| Registration: | N101GL |
| MSN: | 0714 |
| Year of manufacture: | 1975 |
| Total airframe hrs: | 2412 hours |
| Engine model: | Lycoming AEIO-360-B1G6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | San Diego, California -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | San Diego-Montgomery-Gibbs Executive Airport, CA (MYF/KMYF) |
| San Diego, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
About 5 minutes after taking off, the pilot observed that the left upper aileron had come loose from the inboard hinge. The pilot returned to the departure airport and landed uneventfully. A postaccident examination of the airplane revealed that a wing rib aft of the spar at the outboard aileron cutout was substantially damaged.
Examination of the aileron hinge strap fracture surfaces revealed crack arrest marks and thumbnail-shaped patterns on the fracture surfaces, which emanated from both the top and bottom surfaces of the hinge strap. The fracture surfaces were consistent with asymmetric reverse-bending fatigue crack propagation.
The fatigue cracking propagated from the top and bottom surfaces through almost the entire cross-section of the hinge strap.
The pilot reported that while there were no inspection criteria from the manufacturer relative to the hinge straps, all hinge straps were inspected as part of each annual inspection.
Probable Cause: The fracture of the aileron hinge strap due to fatigue crack propagation, which resulted in substantial damage to a wing rib aft of the spar at the outboard aileron cutout. Contributing to the accident was inadequate maintenance inspection.
Accident investigation:
 |
|
Sources:
NTSB WPR19LA114
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 05-Jun-2022 13:14 | ASN Update Bot | Added |
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