ASN Wikibase Occurrence # 285303
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| Date: | Friday 2 February 2007 |
| Time: | 11:30 LT |
| Type: |  Republic RC-3 |
| Owner/operator: | Private |
| Registration: | N6248K |
| MSN: | 455 |
| Total airframe hrs: | 210 hours |
| Engine model: | Lycoming GO-480-G2D6 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Julian, California -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | San Diego-Gillespie Field, CA (SEE/KSEE) |
| Blythe, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
During cruise flight, the propeller assembly departed from the crankshaft flange and fell from the airplane. The pilot executed a forced landing to an open field. The recently overhauled propeller assembly had been installed on the engine for approximately 8 hours prior to the separation. Examination of the airframe revealed the six propeller to crankshaft attachment bolts were fractured, and all failed as a result of fatigue cracking. No chemical composition or other material deficiencies were found on the bolts. Bolt fatigue is most commonly the result of insufficient preload from under torquing the fastener, or improper installation, or from the loss of preload during service. The equal amounts of fatigue on all six bolts suggested that all bolts were equally affected.
Probable Cause: The failure of the propeller to crankshaft attachment bolts due to fatigue. A contributing factor was the improper installation of the propeller assembly by maintenance personnel.
Accident investigation:
 |
|
Sources:
NTSB LAX07LA078
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Oct-2022 07:50 | ASN Update Bot | Added |
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