Loss of control Accident Van's RV-9A N559B, 19 Jun 2010
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ASN Wikibase Occurrence # 288424
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Time:10:03 LT
Type:Silhouette image of generic RV9 model; specific model in this crash may look slightly different    
Van's RV-9A
Registration: N559B
MSN: 91675
Fatalities:Fatalities: / Occupants: 1
Aircraft damage: Substantial
Location:May, Idaho -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Challis Airport, ID (CHL/KLLJ)
Destination airport:May, ID (0U8)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
While approaching his destination airport, the pilot made a left turn to circle over an adjacent town. He then reduced his angle of bank, but continued in a left turn so as to overfly and evaluate the surface condition of the dirt/turf airstrip where he planned to land. At the time that he ultimately rolled wings-level to parallel the runway, he had been in a left turn for approximately four minutes. About 20 seconds after the pilot rolled out of the turn, the airplane rolled to the left and descended into the terrain. A forensic toxicology examination determined that the pilot's blood contained levels of an over-the-counter sedating antihistamine that would be expected to result in impairment, and it is likely that the pilot lost control of his airplane due to spatial disorientation exacerbated by the effects of the antihistamine. A postaccident examination of the airplane's flight control system and primary structure performed by a Federal Aviation Administration airworthiness inspector did not reveal any evidence of a malfunction or anomaly that would have contributed to the rapid roll and descent into the terrain.

Probable Cause: The pilot's failure to maintain control of the airplane during maneuvering flight due to spatial disorientation. Contributing to the accident was the pilot's ingestion of an impairing level of over-the-counter medication.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 11 months
Download report: Final report

Revision history:

04-Oct-2022 22:32 ASN Update Bot Added

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