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ASN Wikibase Occurrence # 188555
Last updated: 17 February 2021
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Date:07-JUL-2016
Time:06:50
Type:Silhouette image of generic AT6T model; specific model in this crash may look slightly different
Air Tractor AT-602
Owner/operator:Bootheel Ag Air
Registration: N967JB
C/n / msn: 602-1243
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Category:Accident
Location:Dunklin County NE of Kennett, MO -   United States of America
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Agricultural
Departure airport:Hornersville, MO (37M)
Destination airport:Hornersville, MO (37M)
Investigating agency: NTSB
Narrative:
The pilot was performing an aerial application flight to a field that was intersected by powerlines. There were no witnesses to the accident, but the wreckage path consisted of broken power lines consistent with an in-flight collision. In addition, the ground scarring was consistent with the airplane operating at a normal speed before the collision, followed by an uncontrolled descent. Examination revealed no mechanical anomalies that would have precluded normal operation.

The 48-year-old pilot had reported multiple orthopedic surgeries and use of medication for high cholesterol to the FAA. At the time of his last aviation medical examination, he was diagnosed with diabetes and began treatment with metformin. The aviation medical examiner (AME) who performed the examination questioned the pilot's records from a recent hospitalization that stated the pilot had anxiety/depression. The pilot told the AME this was not a current diagnosis and that he had not been on medication for these conditions in years.

Toxicology testing identified acetaminophen, an over-the-counter analgesic; chlorpheniramine, a sedating antihistamine available over-the-counter in many cold, cough, and allergy preparations; citalopram, a prescription antidepressant medication; and dextromethorphan, an over-the-counter cough suppressant, in liver. Acetaminophen and chlorpheniramine were found in cavity blood and the rest were found in muscle. Acetaminophen was identified in urine.

It is likely that the pilot did not see the power lines while spraying the field, which resulted in the in-flight collision with the power lines. While treated diabetes can result in hypoglycemia, this is an unusual occurrence when metformin is used as a single agent for the disease. Thus, it is unlikely that the pilot's diabetes or its treatment contributed to this accident. Because the status of the pilot's depression symptoms around the time of the accident were unknown, whether effects from it contributed to his inability to avoid the powerlines could not be determined from the available information. The pilot's use of chlorpheniramine, dextromethorphan, and acetaminophen suggests that he had cold or allergy symptoms and was using an over-the-counter product to treat them. When severe, such symptoms may be quite debilitating; however, the extent to which he had symptoms at the time of the accident and the effectiveness of the treatment could not be determined. As a result, whether his underlying symptoms or the use of medications contributed to the accident circumstances could not be determined.



Probable Cause: The pilot's failure to maintain clearance from power lines while maneuvering during the aerial application flight.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20160708X93955&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=N967JB

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


Revision history:

Date/timeContributorUpdates
07-Jul-2016 15:09 Geno Added
07-Jul-2016 21:21 Geno Updated [Aircraft type, Registration, Cn, Operator, Source, Narrative]
08-Jul-2018 13:15 ASN Update Bot Updated [Time, Operator, Departure airport, Destination airport, Source, Narrative]

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