ASN Wikibase Occurrence # 199062
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| Date: | Tuesday 3 May 2016 |
| Time: | 12:30 |
| Type: |  Cessna 180D |
| Owner/operator: | Private |
| Registration: | N6479X |
| MSN: | 18050979 |
| Year of manufacture: | 1961 |
| Total airframe hrs: | 3369 hours |
| Engine model: | Continental O-470 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Naknek, AK -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Soldotna, AK (SXQ) |
| Naknek, AK (5NK) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial pilot stated that, during the landing rollout in the tailwheel-equipped airplane, the left wheel axle fractured and separated from the airplane with the wheel attached. The left landing gear leg then dug into the runway surface, the airplane made a sudden left turn, and the left wing and left horizontal stabilizer struck the runway.
An examination of the fractured left axle revealed features consistent with a bending overstress fracture. High magnification optical examination of the fracture also revealed several small fatigue cracks within the crack origin area. Although several fatigue initiation sites were present along the fracture origin area, none of them were large enough to have led to the failure or to have significantly lowered the ultimate strength of the axle enough for a bending overstress failure to occur under normal loading conditions. Therefore, it is likely the landing gear axle failed as a result of bending overstress due to a hard landing.
Probable Cause: The overstress fracture and subsequent separation of the left main landing gear axle due to a hard landing, which resulted in the pilot’s inability to maintain directional control of the airplane.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 19-Aug-2017 16:48 | ASN Update Bot | Added |
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