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| Date: | Monday 13 September 2004 |
| Time: | 12:45 LT |
| Type: |  Cessna P206A |
| Owner/operator: | Private |
| Registration: | N4661F |
| MSN: | P206-0261 |
| Year of manufacture: | 1966 |
| Total airframe hrs: | 4248 hours |
| Engine model: | Continental IO-520-A |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Clearwater, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Weiser, ID (S87) |
| Moose Creek, ID (1U1) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While en route, the aircraft's engine began to run rough, vibrate, and make a lot of unusual noises. Soon thereafter the oil pressure dropped to 0 psi, and the engine seized. The pilot then attempted an emergency power-off landing in an open field, but the nose gear collapsed, and the nose gear strut dug into the dirt resulting in the aircraft nosing over onto its back. A teardown inspection of the engine revealed that the number three piston pin had failed, and as a result a significant portion of the internal components of the engine had been destroyed. An examination of the Superior Air Parts piston pin revealed that it had failed along a fatigue crack that propagated across the longitudinal axis of the pin. The portion of the pin that contained the origin of the crack was not recovered, and therefore a determination of the initiating factor could not be made.
,
Probable Cause: A loss of engine power due to fatigue crack propagation of the number three piston pin while in cruise flight, leading to a power off forced landing in an open field. Factors include soft uphill terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA04LA189
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Oct-2022 18:59 | ASN Update Bot | Added |
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