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ASN Wikibase Occurrence # 195085
Last updated: 4 January 2021
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Date:28-APR-2017
Time:13:00
Type:Silhouette image of generic AT6T model; specific model in this crash may look slightly different
Air Tractor AT-602
Owner/operator:Gray Ag Air
Registration: N604RH
C/n / msn: 602-1202
Fatalities:Fatalities: 1 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Category:Accident
Location:Hollis Municipal Airport (O35), Hollis, OK -   United States of America
Phase: Unknown
Nature:Agricultural
Departure airport:Hollis, OK (O35)
Destination airport:Hollis, OK (O35)
Investigating agency: NTSB
Narrative:
The pilot was returning from an application flight at the time of the accident. A witness observed the airplane approaching the airport. He noted that an unusual noise came from the airplane but was unsure of the exact nature. Shortly afterward, he heard a loud explosion. Ground-based video footage depicted the airplane entering a rapid descent while on final approach until it went behind an intervening tree line. A plume of smoke rose from that location few seconds later.

A postaccident examination of the airframe, engine and propeller did not reveal any anomalies consistent with a preimpact failure or malfunction. However, an examination of some components was limited due to the extent of the impact damage.

Toxicology testing revealed that the pilot had used three sedating drugs: cetirizine, oxycodone, and oxazepam. However, only oxycodone was still present at a level that could have been impairing. Because patients using opioids may develop significant tolerance to the sedating side effects, there is no accepted relationship between blood levels and impairment from these medications. Therefore, the extent of impairment, if any, could not be determined.

The reason for the abrupt descent and impact with terrain while on final approach could not be determined because the postaccident examination did not reveal any preimpact anomalies.

Probable Cause: An impact with terrain during final approach for reasons that could not be determined because no evidence of an in-flight failure or malfunction was observed.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20170501X81827&key=1
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=604RH

https://flightaware.com/photos/view/29032-041278cb0292c4ee559cbd30be6ceedbd4ad0b74/aircrafttype/

Accident investigation:
cover
  
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 11 months
Download report: Final report


Revision history:

Date/timeContributorUpdates
29-Apr-2017 00:48 Geno Added
29-Apr-2017 20:35 Geno Updated [Time, Aircraft type, Registration, Cn, Operator, Source]
15-Apr-2019 14:45 ASN Update Bot Updated [Time, Operator, Departure airport, Destination airport, Source, Damage, Narrative, Accident report, ]

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