ASN Wikibase Occurrence # 284676
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| Date: | Saturday 30 June 2007 |
| Time: | 07:00 LT |
| Type: |  Air Tractor AT-502A |
| Owner/operator: | Thiel Air Care, Inc. |
| Registration: | N6176L |
| MSN: | 502A-0352 |
| Year of manufacture: | 1996 |
| Total airframe hrs: | 4814 hours |
| Engine model: | Pratt & Whitney PT6-65B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chowchilla, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Chowchilla, CA |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The engine lost power about 20 to 30 feet above ground level in the takeoff initial climb. The pilot landed in a pasture, with the airplane coming to rest upright after colliding with several fences. A post accident examination of the engine revealed that the engine failure was the result of the fatigue fracture and separation of two compressor turbine blades. Once liberated, the two blades impacted the other compressor turbine blades, which resulted in the airfoil portions of those remaining blades to fracture in overstress. The fatigue crack in one blade occupied about 40 percent of the fracture surface, while the fatigue crack in the second blade occupied about 60 percent of the fracture surface.
Probable Cause: The loss of engine power as the result of the fatigue fracture and separation of two compressor turbine blades, which induced a catastrophic failure of the compressor turbine section.
Accident investigation:
 |
|
Sources:
NTSB SEA07LA204
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Oct-2022 05:58 | ASN Update Bot | Added |
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