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| Date: | Thursday 22 June 2023 |
| Time: | 10:25 |
| Type: |  Cessna 421 Golden Eagle |
| Owner/operator: | Private |
| Registration: | HK-4964G |
| MSN: | 4210068 |
| Year of manufacture: | 1968 |
| Total airframe hrs: | 3134 hours |
| Engine model: | Continental GTSIO-520-D |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Other fatalities: | 0 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Medellín-Enrique Olaya Herrera Airport (EOH/SKMD) -
 Colombia
|
| Phase: | Landing |
| Nature: | Test |
| Departure airport: | Medellín-Enrique Olaya Herrera Airport (EOH/SKMD) |
| Medellín-Enrique Olaya Herrera Airport (EOH/SKMD) | |
| Investigating agency: | Aerocivil |
| Confidence Rating: |  Accident investigation report completed and information captured |
While conducting a maintenance check flight, a touch-and-go maneuver was executed, during which there was a hard contact with the runway.
Subsequently, during the full-stop landing on runway 02, while decelerating, the left landing gear gradually collapsed, causing the aircraft to tilt and veer to that side. The left wing made contact with the ground, and the blades of engine No. 1 struck the runway surface. The pilot managed to maintain control until the aircraft came to a stop on the left side of the runway, with the wing resting on the edge of the paved surface. The pilot shut down the engines, and all occupants evacuated the aircraft on their own without injuries.
The investigation determined the probable cause of the serious incident to be:
Collapse of the left main landing gear during landing, caused by the sudden fracture due to material fatigue of the pivot bolt, part number NAS464P4-26.
Among the contributing factors that may have influenced the occurrence of the event were:
- Possible generation of cyclical structural overloads in the landing gear, likely due to the application of variable loads during takeoffs and landings, especially on unpaved surfaces.
- Probable material failure, as the pivot bolt (S/N: NAS464P4-26) failed due to fatigue before reaching the inspection interval specified by the Manufacturer’s Manual.
Accident investigation:
 |
|
Sources:
Aerocivil
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Jun-2025 08:21 | ASN | Added |
| 12-Jun-2025 08:23 | ASN | Updated [Operator, ] |
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