ASN Wikibase Occurrence # 284408
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| Date: | Saturday 18 August 2007 |
| Time: | 06:52 LT |
| Type: |  Air Tractor AT-301 |
| Owner/operator: | Rocky Mountain Ag Inc |
| Registration: | N69WN |
| MSN: | 301-0683 |
| Year of manufacture: | 1988 |
| Total airframe hrs: | 5109 hours |
| Engine model: | Pratt & Whitney R-1340 ANI |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Alamosa, Colorado -
 United States of America
|
| Phase: | Unknown |
| Nature: | Agricultural |
| Departure airport: | Monte Vista Municipal Airport, CO (KMVI) |
| Monte Vista Municipal Airport, CO (KMVI) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The airplane was conducting aerial applications of anti-sprouting chemicals when the number one cylinder head separated. The windscreen was covered in oil, obscuring the pilot's view. The pilot dropped his chemical load and performed a forced landing to a dirt road. During the landing, the left wing impacted a sand berm and the airplane nosed over, coming to rest inverted, and resulting in substantial damage. The pilot reported no additional anomalies with the airplane's systems. Examination of the fracture surface revealed fatigue cracking initiated from multiple locations in a root of the head threads and propagated in an arc to the outer surface of the combustion chamber wall.
Probable Cause: The failure of the number one cylinder due to fatigue. Contributing to the accident was the pilot's diminished visual lookout due to the oil covered windscreen.
Accident investigation:
 |
|
Sources:
NTSB DEN07LA138
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 16:17 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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