ASN Wikibase Occurrence # 216049
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| Date: | Friday 5 October 2018 |
| Time: | 14:45 |
| Type: |  North American Navion A |
| Owner/operator: | Private |
| Registration: | N969TR |
| MSN: | NAV-4-342 |
| Year of manufacture: | 1946 |
| Total airframe hrs: | 3336 hours |
| Engine model: | Continental E-225-4 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Clarke County, MS -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Meridian-Key Field, MS (MEI/KMEI) |
| Gulf Shores-Edwards Airport, AL (GUF/KJKA) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot stated that, while en route to his destination, the airplane's engine sputtered and then lost total power. During the subsequent forced landing to a highway, the airplane landed hard, and the landing gear collapsed; the airplane sustained substantial damage to the fuselage. A postaccident examination of the engine revealed the No. 3 cylinder exhaust valve fractured where the stem transitioned to the valve head seat. The valve head impacted the No. 3 piston and became lodged between the crankcase and the camshaft, which resulted in the fracture of the camshaft. Fatigue cracking, which initiated at multiple sites, propagated through the valve stem. The presence of a tapered stem near the fracture surface, high temperature oxide deposits, and fatigue striations on the fracture surface suggested that the stem underwent spallation or erosion of the oxides formed during high temperature exposure, which would reduce the stem cross-section over time, increasing the likelihood of initiating fatigue cracking. Additionally, a localized area of wear on the top face of the valve stem was most likely due to the valve not rotating during operation, which could create hot spots or improper thermal dissipation in the hottest parts of the valve and lead to valve damage or failure.
Probable Cause: The fatigue failure of the No. 3 cylinder exhaust valve, which resulted in a fractured camshaft and a total loss of engine power.
Accident investigation:
 |
|
Sources:
NTSB
Location
Images:
Photo: NTSB
Media:
North American Navion A plane crash lands on highway in Mississippi; no one hurt - ABC News - https://t.co/Nn4hascbqd via @ABC pic.twitter.com/hnMdTlPARZ
— Planes Of Legend (@PlanesOfLegend) 6 octobre 2018
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 06-Oct-2018 00:18 | Geno | Added |
| 06-Oct-2018 10:00 | Iceman 29 | Updated [Time, Phase, Nature, Departure airport, Destination airport, Source, Embed code] |
| 07-Oct-2018 19:16 | harro | Updated [Departure airport, Destination airport, Embed code] |
| 15-Aug-2020 16:00 | ASN Update Bot | Updated [Time, Departure airport, Destination airport, Source, Narrative, Accident report, ] |
| 15-Aug-2020 16:25 | harro | Updated [Departure airport, Destination airport, Source, Narrative, Photo, Accident report, ] |
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