ASN Wikibase Occurrence # 242781
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information.
If you feel this information is incomplete or incorrect, you can submit corrected information.
| Date: | Saturday 27 July 2019 |
| Time: | 16:17 LT |
| Type: |  Ryan Navion B |
| Owner/operator: | Private |
| Registration: | N27AW |
| MSN: | NAV-4-2172B |
| Year of manufacture: | 1950 |
| Total airframe hrs: | 3920 hours |
| Engine model: | Lycoming Engines GO-480-G1D6 |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chicago-Midway Airport, IL (MDW/KMDW) -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Kenosha-Kenosha Municipal Airport, WI (ENW/KENW) |
| Chicago-Midway Airport, IL (MDW/KMDW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that as the airplane touched down on the dry concrete runway, he heard a "snap" noise but that the landing was "smooth and normal." He taxied the entire length of the runway for the rollout but then had difficulty taxiing the airplane straight. The pilot thought that he had a flat tire until he exited the airplane and saw that the left main landing gear had failed.
A postaccident examination revealed the left main landing gear upper side brace assembly fractured due to reverse bending fatigue at the circumferential weld between the middle tube and the fork at the inboard end of the assembly. The fatigue initiated from the tip of the weld in areas of incomplete weld penetration. The weld was performed during initial production of the component. The fatigue cracks extended radially outward from the interior surface of the tube, but the fatigue region did not intersect the outer surface. Thus, the cracks likely would not have been detected by visual inspection. The failure of the weld resulted in the displacement of the left main landing gear strut outboard toward the wingtip, which caused substantial damage to the underside of the left wing.
Probable Cause: The failure of the left main landing gear upper side brace assembly during landing due to reverse bending fatigue as a result of the incomplete penetration of the circumferential weld during initial production of the component.
Accident investigation:
 |
|
Sources:
NTSB CEN19LA251
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Sep-2020 12:00 | ASN Update Bot | Added |
| 27-Mar-2021 09:50 | ASN Update Bot | Updated [Time, Other fatalities, Departure airport, Destination airport, Source, Narrative, Category, Accident report] |
| 27-Mar-2021 10:37 | harro | Updated [Location, Source, Narrative] |
| 21-Jun-2021 15:27 | Anon. | Updated [Aircraft type] |
Corrections or additions? ... Edit this accident description
The Aviation Safety Network is an exclusive service provided by:
Quick Links:
| ASN Home | Send Correction / Feedback |
| FSF Home | Disclaimer | Copyright |
| Contact Us | Privacy Policy |
| Press / Media |
CONNECT WITH US:
©2024 Flight Safety Foundation