ASN Wikibase Occurrence # 294766
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| Date: | Thursday 22 July 2004 |
| Time: | 20:30 LT |
| Type: |  Grumman G-164A |
| Owner/operator: | Private |
| Registration: | N7220 |
| MSN: | 896 |
| Year of manufacture: | 1972 |
| Engine model: | Pratt & Whitney R-985 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Nyssa, Idaho -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Nyssa, ID |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During an aerial application run, the pilot heard a loud bang, and the engine suddenly lost a significant amount of power. Because the aircraft did not have enough power to remain airborne, the pilot elected to execute a forced landing in a nearby agricultural field. Although the initial touchdown was uneventful, the main gear of the aircraft dug into the soft terrain, leading to a main gear collapse and a nose-over of the aircraft. It was ultimately determined that while the aircraft was in flight, the number four cylinder head had fractured near where the cylinder head was screwed into the cylinder barrel, and the fracture was of such a nature that it kept the cylinder from developing the compression necessary for detonation of the fuel/air mixture.
Probable Cause: The failure (fracture) of the number four cylinder head during an aerial application run. Factors include the soft crop-covered terrain.
Accident investigation:
 |
|
Sources:
NTSB SEA04LA139
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 12-Oct-2022 08:53 | ASN Update Bot | Added |
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