ASN Wikibase Occurrence # 215454
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| Date: | Thursday 24 November 2016 |
| Time: | 08:50 |
| Type: |  Cessna 182A Skylane |
| Owner/operator: | Private |
| Registration: | N6077B |
| MSN: | 34077 |
| Year of manufacture: | 1957 |
| Total airframe hrs: | 5243 hours |
| Engine model: | Continental O-470 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Safford, AZ -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Safford, AZ (SAD) |
| Holbrook, AZ | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The commercial pilot reported that, during cruise flight, he noticed the oil pressure begin to fluctuate and he decided to return to the departure airport. As the airplane neared the airport, the engine experienced a total loss of power, and the pilot initiated an off-airport forced landing. During the landing roll, the airplane struck two dirt berms and the nose landing gear collapsed. Postaccident examination of the engine revealed that the connecting rods, pistons, piston pins, bearings, and bushings in cylinder Nos. 5 and 6 exhibited numerous fractures and severe deformation. Due to the widespread postfracture damage to many of the fracture surfaces, it was not possible to determine which component fractured first. The No. 5 cylinder connecting rod and cap were severely deformed and battered. The piston pin had fractured in multiple places, and the underside of the piston exhibited gouging consistent with impact from adjacent components. In addition, the skirt and pin boss of the piston had fractured in multiple locations. The features on these fracture surfaces were generally consistent with having fractured in and around the pin boss; therefore, the likely initial point of failure in cylinder No. 5 was either the piston pin boss, the piston pin, or the pin side of the connecting rod. Based on the degree of damage observed, the components in the No. 5 cylinder likely began to fracture first, followed by fractures in the No. 6 cylinder.
Probable Cause: The total loss of engine power due to the failure of the No. 5 piston, piston pin, or connecting rod assembly for reasons that could not be determined due to the severity of the post fracture damage.
Accident investigation:
 |
|
Sources:
NTSB
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 16-Sep-2018 19:09 | ASN Update Bot | Added |
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