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| Date: | Thursday 25 May 2023 |
| Time: | 13:45 LT |
| Type: |  Cessna 310I |
| Owner/operator: | |
| Registration: | N6PK |
| MSN: | 310I0021 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 5695 hours |
| Engine model: | Continental IO-520-E |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Sunnyside Municipal Airport (1S5), Sunnyside, WA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Moses Lake-Grant County Airport, WA (MWH/KMWH) |
| Sunnyside, WA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that while on final approach he extended the gear, and a green light illuminated signifying that the gear was down. The landing was “firm' and, shortly after touchdown, the airplane's right main landing gear slowly collapsed, causing the right wing to drop. The airplane veered to the right, exited the runway, and came to rest in a field about 100 ft from the runway centerline. During the accident sequence, the airplane sustained substantial damage to the right horizontal stabilizer and elevator.
Postaccident examination of the right main landing gear fracture surface revealed that the side brace lock assembly likely fractured due to excessive axial compression loads that resulted in a ductile overstress fracture. Additionally, the bent side brace lock assembly attachment bolt at the lower end of the lock link also indicated that the loads associated with the failure of the attachment pin exceeded the design axial loads for the side brace lock assembly and were consistent with overload of the side brace lock assembly. The bearings and pin that attached the side brace lock to the lower end of the bellcrank, which were not recovered, were likely fractured as a result of the loads.
The damage to the gear indicated that it likely failed as a result of the hard landing.
Probable Cause: The failure of the side brace lock assembly of the right main landing gear due to overstress as a result of a hard landing.
Accident investigation:
 |
|
Sources:
NTSB WPR23LA226
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 22-Jun-2023 21:14 | Captain Adam | Added |
| 24-Nov-2024 15:09 | ASN Update Bot | Updated [Time, Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative, ] |
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