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ASN Wikibase Occurrence # 186300
Last updated: 6 December 2019
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Type:Silhouette image of generic AC90 model; specific model in this crash may look slightly different
Rockwell Aero Commander 690B
Registration: N690TH
C/n / msn: 11487
Fatalities:Fatalities: 2 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Williamson County, NE of Taylor at Hare, TX -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Departure airport:Georgetown, TX (GTU)
Destination airport:Georgetown, TX (GTU)
Investigating agency: NTSB
The private pilot, who was the owner of the airplane, and a flight instructor were performing a recurrent training flight. Radar data showed that the airplane departed and climbed to an altitude about 5,000 ft above ground level. About 5 minutes after takeoff, the airplane conducted a left 360 turn followed by a right 360 turn, then continued in level flight for about 2 minutes as it slowed to a groundspeed of about 90 knots, which may have been indicative of airwork leading to slow flight or stall maneuvers. The airplane then entered a steep bank and impacted the ground in a nose-low attitude. Both engines and propellers displayed evidence of operation at the time of impact, and postaccident examination revealed no mechanical anomalies that would have precluded normal operation of the airframe or engines.

The instructor had a history of obstructive sleep apnea. The investigation was unable to determine how well the condition was controlled, if he had symptoms from the condition, or if it contributed to the accident. Toxicology testing revealed low levels of ethanol in specimens from both pilots; however, it is likely that some or all of the ethanol detected was a result of postmortem production, and it is unlikely that alcohol impairment contributed to the accident. Toxicology testing also detected the primary psychoactive compound of marijuana, tetrahydrocannabinol (THC), and its metabolite, tetrahydrocannabinol carboxylic acid (THC-COOH), in specimens obtained from comingled remains; the investigation was unable to reliably determine which pilot had used the impairing illicit drug. Additionally, it is not possible to determine impairment from tissue specimens; therefore, the investigation was unable to determine whether THC impaired either of the pilots or if it may have contributed to the accident.

Probable Cause: A loss of control while maneuvering for reasons that could not be determined because postaccident examination did not reveal any mechanical malfunctions or anomalies with the airplane.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 10 months
Download report: Final report


Photo: NTSB

Revision history:

09-Apr-2016 20:58 Geno Added
10-Apr-2016 00:12 Geno Updated [Aircraft type, Nature, Departure airport, Source]
11-Apr-2016 16:08 Geno Updated [Registration, Cn, Operator, Phase, Source, Damage, Narrative]
22-Apr-2016 16:29 Aerossurance Updated [Time, Destination airport, Source, Narrative]
21-Dec-2016 19:30 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Mar-2018 17:57 ASN Update Bot Updated [Departure airport, Destination airport, Source, Narrative]
01-Mar-2018 18:07 harro Updated [Source, Narrative, Photo, ]

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