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ASN Wikibase Occurrence # 185337
 
This record has been locked for editing.

Date:12-MAR-2016
Time:08:47
Type:Silhouette image of generic RV8 model; specific model in this crash may look slightly different
Van's RV-8A
Owner/operator:Private
Registration: N838RV
MSN: 80797
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Clermont, Florida -   United States of America
Phase: En route
Nature:Private
Departure airport:Port Orange, FL (7FL6)
Destination airport:Winter Haven, FL (GIF)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
Narrative:
The private pilot was in cruise flight in the experimental, amateur-built airplane. The pilot transmitted a mayday call via radio, stating that he had "lost an engine." Witnesses saw the airplane before impact and stated that the airplane was not making any sound. One witness saw the airplane enter a sharp turn before entering a nose-low descent. The airplane then impacted an open field; the sharp turn followed by the nose-low descent is consistent with an aerodynamic stall.

Examination of the experimental, kit-built engine revealed that the crankshaft had fractured forward of the No. 2 connecting rod journal. Further testing of the crankshaft revealed that the fracture was the result of fatigue cracking. There were no chemical variations or foreign material present in the metallurgical testing. The crankshaft only had 20 hours total time in service, suggesting that initiation of the cracking and the subsequent failure of the crankshaft was almost immediate. As there were no apparent metallurgical mechanical deficiencies with the crankshaft, the fatigue failure was likely the result of unusual stresses; however, there was insufficient information about the engine operation in the final 17 minutes of flight to determine the reason for the failure.

Although the pilot's toxicology results tested positive for Zolpidem, a prescription medication for the treatment of insomnia, the values were below the normal therapeutic range and there was no evidence that impairment contributed to the accident.

Probable Cause: The pilot's exceedance of the airplane's critical angle of attack while maneuvering for a forced landing; which resulted in an aerodynamic stall and loss of control. Contributing to the accident was the fatigue failure of the crankshaft for reasons that could not be determined based on the available information.

Sources:

NTSB

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years and 2 months
Download report: Final report
Location


Images:


Photo: NTSB

Revision history:

Date/timeContributorUpdates
12-Mar-2016 17:05 gerard57 Added
12-Mar-2016 18:45 Geno Updated [Location, Source]
13-Mar-2016 20:31 Hans Gruber Updated [Source]
14-Mar-2016 07:15 Anon. Updated [Aircraft type]
14-Mar-2016 15:11 Geno Updated [Registration, Cn, Source, Damage, Narrative]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Jun-2018 09:56 ASN Update Bot Updated [Departure airport, Destination airport, Source, Narrative]
01-Jun-2018 12:04 harro Updated [Narrative, Photo, ]

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