ASN Wikibase Occurrence # 173721
This record has been locked for editing.
| Date: | Tuesday 10 February 2015 |
| Time: | 13:30 |
| Type: |  Van's RV-7 |
| Owner/operator: | Private |
| Registration: | N513BW |
| MSN: | 70192 |
| Year of manufacture: | 2011 |
| Total airframe hrs: | 66 hours |
| Engine model: | Lycoming IO-360 A1A |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Hood Canal beach SW of Belfair, WA -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Gig Harbor, WA (TIW) |
| Bremerton, WA (PWT) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot reported that the airplane was at 1,500 ft mean sea level as he was returning to the departure airport when the engine “abruptly quit.” When all attempts to restart the engine failed, the pilot chose to land on a gravelly split. During the landing roll, the airplane’s small tires sunk into the gravel, which resulted in the airplane nosing over.
A postaccident examination of the engine revealed that the crankshaft had fractured adjacent to the aft radius of the No. 3 rod journal. Examination of the crankshaft revealed that it failed due to fatigue cracking that had initiated at locations on either side of a preexisting longitudinal crack. The radius also contained several circumferential cracks, including ones in the region corresponding to the relative location of the fatigue origins of the fracture. Examination also revealed that the No. 3 rod journal had been chromium-plated to regain lost material; however, according to the engine manufacturer, chromium plating on bearing journals was not an approved repair. Although the fatigue did not initiate in the plating, it did start near the edge of the replating in an area likely reworked (ground) following the unapproved plating. The multiple circumferential cracks noted in the radius likely resulted from the repair grinding and may have contributed to the fatigue initiation. A review of the engine logbooks revealed that the engine had been overhauled and subsequently inspected by the “magnaflux method” three times in a 14-month period about 15 years before the accident, during which the extensive cracking would have been present, indicating that the magnaflux inspections of the crankshaft were not effectively performed.
Probable Cause: A total loss of engine power during cruise flight due to the fatigue failure of the engine crankshaft. Contributing to the accident was the unapproved repair and improper inspection of the engine crankshaft.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N513BW
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Feb-2015 03:38 | Geno | Added |
| 11-Feb-2015 04:56 | Geno | Updated [Time, Aircraft type, Operator, Departure airport, Destination airport, Source] |
| 11-Feb-2015 17:09 | Geno | Updated [Registration, Cn, Destination airport, Source, Damage, Narrative] |
| 11-Feb-2015 17:11 | Geno | Updated [Cn, Narrative] |
| 13-Feb-2015 02:05 | Geno | Updated [Source, Damage, Narrative] |
| 24-Sep-2016 06:21 | junior sjc | Updated [Nature, Source, Narrative] |
| 24-Sep-2016 06:21 | junior sjc | Updated [Source, Narrative] |
| 26-Sep-2016 06:18 | junior sjc | Updated [Narrative] |
| 21-Dec-2016 19:28 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 12:35 | ASN Update Bot | Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative] |
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