ASN Wikibase Occurrence # 352363
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| Date: | Tuesday 9 November 1999 |
| Time: | 12:00 LT |
| Type: |  Beechcraft A60 |
| Owner/operator: | Boulder County Sheriffs Dept |
| Registration: | N457DA |
| MSN: | P-166 |
| Total airframe hrs: | 6117 hours |
| Engine model: | Lycoming TIO-541E1C4 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Boulder, CO -
 United States of America
|
| Phase: | Unknown |
| Nature: | Unknown |
| Departure airport: | Englewood, CO (APA |
| (1V5) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot said that as he descended to 6,500 feet mean sea level, the left engine of the twin-engine airplane failed. The pilot landed the airplane without further incident. The engine had 23.5 hours on it since major overhaul. An engine teardown revealed that the #6 connecting rod had failed. Examination of the #6 cylinder parts found preexisting fractures on both the rod cap and the connecting rod. The fatigue features displayed on the rod cap are suggestive of lower stress propagation than those stress propagation marks on the connecting rod. It appeared that the engine failure-initiating event was the failure of the rod cap. Examination of the #6 connecting rod bolts indicated that they fractured as a result of overstress.
Probable Cause: The fatigue failure of the #6 cylinder connecting rod cap.
Accident investigation:
 |
|
Sources:
NTSB DEN00IA075
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 12:35 | ASN Update Bot | Added |
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