Pilot Debrief

AIR TRACTOR INC AT 602 near Hollis, OK — 2017-04-28

Final reportCEN17FA170
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Date
2017-04-28
Location
Hollis, OK, USA
Airport
O35
Aircraft
AIR TRACTOR INC AT 602
Registration
N604RH
Category
Airplane
Highest injury
Fatal
Fatalities
1
Phase of flight
Approach

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.

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.

Analysis

Primary failure mode
Human factors
First missed decision gate
Pilot could have avoided beta mode during approach to prevent loss of control.

NTSB coding

Evidence available

  • Video
  • 12 docket documents
View NTSB final reportView NTSB docket

Docket documents12

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