ASN Wikibase Occurrence # 178035
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| Date: | Tuesday 21 July 2015 |
| Time: | 14:46 |
| Type: |  Cessna 182Q Skylane |
| Owner/operator: | Interstate Aviation Inc |
| Registration: | N759LV |
| MSN: | 18266087 |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 5102 hours |
| Engine model: | Continental O-470-U |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Kings Pass near Prichard, ID -
 United States of America
|
| Phase: | Landing |
| Nature: | Survey |
| Departure airport: | Coeur d'Alene, ID |
| Coeur d'Alene, ID | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial pilot reported that, during cruise on the fire reconnaissance flight, he heard a loud pop, followed by oil covering the windscreen; the engine subsequently experienced a total loss of power. Despite the pilot’s attempts, the engine would not restart, and he initiated a forced landing to an open field. During the landing roll, the nose landing gear separated from the airplane and the right wing impacted the ground. Postaccident examination of the engine revealed that the bottom portion of the No. 6 cylinder piston, piston pin, and connecting rod cap were separated.
Metallurgical examination of the piston pin revealed evidence of a fatigue fracture originating from the outside of the pin that progressed inward until the final fracture along the middle of the pin cross-section. The fatigue crack initiation site did not reveal any material or mechanical defects, such as pits, voids, or inclusions. Examination of the piston, connecting rod bolts, and connecting rod cap revealed fractures consistent with overstress. No additional anomalies were noted with the engine.
Probable Cause: A total loss of engine power due to the fatigue failure of the No. 6 cylinder piston pin.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 23-Jul-2015 05:50 | Geno | Added |
| 24-Jul-2015 06:38 | Anon. | Updated [Aircraft type] |
| 07-Aug-2015 00:57 | Geno | Updated [Date, Aircraft type, Registration, Cn, Location, Departure airport, Source, Narrative] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 19-Aug-2017 15:07 | ASN Update Bot | Updated [Operator, Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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