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ASN Wikibase Occurrence # 150343
Last updated: 25 November 2020
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Date:23-OCT-2012
Time:14:03
Type:Silhouette image of generic GLAS model; specific model in this crash may look slightly different
Glasair III
Owner/operator:Dsb Inc
Registration: N655DB
C/n / msn: 3051
Fatalities:Fatalities: 2 / Occupants: 2
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:A field near Byron, California -   United States of America
Phase: En route
Nature:Private
Departure airport:Brentwood, CA (4CA2)
Destination airport:Brentwood, CA (4CA2)
Investigating agency: NTSB
Narrative:
The two pilots, one of whom owned the airplane, departed for a personal flight. The airplane was equipped with dual flight controls; however, it could not be determined which pilot was manipulating the controls at the time of the accident. Witnesses located adjacent to the accident site reported that they heard a loud noise and then saw the airplane slow down and begin to spin left in a slight nose-low attitude. The witnesses further reported that the airplane continued to spin until it impacted terrain. Postaccident examination of the engine and airframe revealed no evidence of any preexisting mechanical anomalies that would have precluded normal operation. Wreckage and impact signatures were consistent with a flat-spin, slightly nose-low impact with terrain.
Postmortem toxicology tests for the left seat pilot/owner were positive for doxylamine (an antihistamine used in over-the-counter sleep aids and cough medicines) and methamphetamine (a central nervous system stimulant). Because the amount of doxylamine in his system at the time of the crash was below the therapeutic limit, its direct effects on the left-seat pilotís performance at the time of the crash could not be determined. Although methamphetamine was present in the left-seat pilotís blood, the amount was below the calibration limit of the toxicology tests. However, both methamphetamine and its metabolite (amphetamine) were present in his urine. Regardless, no direct correlation exists between the concentration of drug in the blood and the userís symptoms. Although it is unlikely that the left-seat pilot was actively euphoric at the time of the flight, he was likely in the late phase of symptoms or in the withdrawal phase(during which concentrations of the drug may be undetectable), which would have been impairing. However, as noted, it could not be determined which pilot was manipulating the controls at the time of the accident; therefore, the impact of the left-seat pilotís drug impairment on the flight could also not be determined.

Probable Cause: The pilot's failure to maintain control of the airplane while maneuvering, which resulted in a stall and subsequent spin.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20121024X11737&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=655DB&x=0&y=0


Revision history:

Date/timeContributorUpdates
24-Oct-2012 02:49 gerard57 Added
24-Oct-2012 09:03 Geno Updated [Registration, Cn, Operator, Source]
21-Dec-2016 19:28 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
28-Nov-2017 13:46 ASN Update Bot Updated [Operator, Other fatalities, Departure airport, Destination airport, Source, Narrative]

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