ASN Wikibase Occurrence # 240207
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| Date: | Tuesday 18 August 2020 |
| Time: | 20:05 LT |
| Type: |  Piper PA-28-181 Archer II |
| Owner/operator: | Uaa International Inc. |
| Registration: | N79MS |
| MSN: | 28-7990154 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 14224 hours |
| Engine model: | Lycoming O-360-A4M |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Upland-Cable Airport (CCB/KCCB), CA -
 United States of America
|
| Phase: | Taxi |
| Nature: | Training |
| Departure airport: | Upland-Cable Airport, CA (CCB/KCCB) |
| Upland-Cable Airport, CA (CCB/KCCB) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
After landing, as the pilot was taxiing back to the runway for another takeoff, the right landing gear collapsed, and the right wing struck the runway resulting in substantial damage.
Examination of the landing gear bolts revealed they failed due to reverse bending fatigue cracking. The size of the fatigue cracking area on the fracture surfaces versus the overstress area indicated the fatigue likely grew over time under low-to-moderate stress. The occurrence of the fatigue cracking on all the hex-head bolts and the similarities of the fatigue cracking areas on the fracture surfaces were consistent with some amount of movement on that side of the landing gear, which indicates there was likely an issue with preloading of the bolts.
Probable Cause: The failure of the right landing gear due to fatigue cracking.
Accident investigation:
 |
|
Sources:
NTSB WPR20LA306
https://flightaware.com/live/flight/N79MS
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Aug-2020 16:36 | Captain Adam | Added |
| 09-Sep-2022 13:52 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
| 09-Sep-2022 13:56 | harro | Updated [Departure airport, Destination airport, Source, Narrative] |
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