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| Date: | Friday 11 August 2000 |
| Time: | 11:36 LT |
| Type: |  Air Tractor AT-802F |
| Owner/operator: | Aero Spray, Inc. |
| Registration: | N6159F |
| MSN: | 802A-0029 |
| Year of manufacture: | 1996 |
| Total airframe hrs: | 2258 hours |
| Engine model: | P&W PT-6-67-AG |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Other fatalities: | 0 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Salmon River, ID -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Agricultural |
| Departure airport: | Grangeville, ID (S80) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
While conducting fire suppression operations the airplane sustained substantial damage subsequent to a loss of engine power and forced landing. The pilot reported that during a normal application run over the fire, the airplane lost engine power. Due to unsuitable terrain for an emergency landing, the pilot ditched the airplane into a nearby river. Post accident inspection of the turbine engine revealed that a compressor turbine blade was fractured in the first serration of the fir-tree root. Personnel from the Materials Laboratory examined the fracture face of the affected turbine blade and reported that the fracture surface appeared smooth with a curving boundary, typical of fatigue. Fatigue striations and ratchet marks, typical of high-cycle fatigue propagation were observed. Near the fatigue origin, no surface damage was observed, and no material anomalies were visible on the fracture surface.
Probable Cause: Compressor turbine blade failure due to high-cycle fatigue initiating in the surface of the fir-tree root. Factors include unsuitable terrain for an emergency landing.
Accident investigation:
 |
|
Sources:
NTSB SEA00LA160
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-May-2024 09:26 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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