ASN Wikibase Occurrence # 157544
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| Date: | Wednesday 10 July 2013 |
| Time: | 04:45 |
| Type: |  Beechcraft A36 Bonanza |
| Owner/operator: | Silver Sage Aviation |
| Registration: | N517DJ |
| MSN: | E-3075 |
| Year of manufacture: | 1997 |
| Total airframe hrs: | 1294 hours |
| Engine model: | Continental IO-550 SERIES |
| Fatalities: | Fatalities: 0 / Occupants: 4 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Near Fallon Municipal Airport (KFLX), Fallon, NV -
 United States of America
|
| Phase: | Take off |
| Nature: | Passenger - Non-Scheduled/charter/Air Taxi |
| Departure airport: | Fallon, NV (FLX) |
| Dixie Vally, NV (NV30) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that, during climbout, when the airplane was about 1,000 ft above ground level, the engine lost power. The pilot subsequently maneuvered the airplane to attempt to land on the departure runway. The airplane touched down short of the runway in rough, desert terrain, which resulted in substantial damage to the wings, fuselage, and empennage.
A postaccident engine examination revealed that the No. 5 connecting rod cap and one of its two bolts had fractured midlength; the opposite bolt was intact with the nut still fastened. Metallurgical examination revealed that the No. 5 connecting rod had failed due to a fatigue crack that had initiated on the outer surface of the nut-facing boss. The crack propagated inward until the final cross-section of the connecting rod yoke failed in overstress, which then catastrophically breeched the left side of the engine case. The fatigue crack did not show any material imperfections; however, the surface finish of the boss where the fatigue crack initiated was consistent with it having been shot peened. Although shot peening is performed to impart compressive stresses to prevent fatigue crack initiation, excessive peening times may sufficiently alter the surface to create stress concentrators. However, the configuration of the fractured rod yoke precluded any accurate surface roughness measurements and, therefore, it could not be determined if improper surface modification had occurred.
Probable Cause: A fatigue failure of the No. 5 connecting rod, which resulted in a catastrophic engine failure during the initial climb and a subsequent forced landing.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=517DJ
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 10-Jul-2013 19:08 | Geno | Added |
| 10-Jul-2013 19:44 | RobertMB | Updated [Registration, Cn, Source] |
| 12-Jul-2013 14:10 | Anon. | Updated [Nature, Damage] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 29-Nov-2017 08:50 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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