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ASN Wikibase Occurrence # 173721
 
This record has been locked for editing.

Date:10-FEB-2015
Time:13:30
Type:Silhouette image of generic RV7 model; specific model in this crash may look slightly different    
Van's RV-7
Owner/operator:Brooks D Wolfe
Registration: N513BW
MSN: 70192
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
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)
Destination airport:Bremerton, WA (PWT)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
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.

Sources:

NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N513BW

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration:
Download report: Final report
Location


Revision history:

Date/timeContributorUpdates
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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