Pilot Debrief

AIR TRACTOR INC AT-802A near Estes Park, CO — 2021-11-17

Final reportCEN22FA035
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Date
2021-11-17
Location
Estes Park, CO, USA
Aircraft
AIR TRACTOR INC AT-802A
Registration
N802NZ
Category
Airplane
Highest injury
Fatal
Fatalities
1
Phase of flight
Approach

Probable cause

The airplane’s encounter with severe to extreme turbulence associated with mountain wave rotor cloud activity, which resulted in loss of airplane control.

NTSB narrative

The aerial firefighting flight was approaching the intended drop location when the airplane rolled inverted, descended, and impacted terrain. The airplane wreckage displayed features of a low-speed, nose-down impact with the engine producing power. The airplane sustained substantial damage to the fuselage, wings, and empennage. Recorded data showed decreasing indicated airspeed and increasing engine power toward the end of the flight. Postaccident examination of the airplane revealed no mechanical anomalies that would have precluded normal operation. The accident site was located on the eastern slope of a high mountain range, and west winds gusting to near 30 knots were reported near the time of the accident. An animation of satellite imagery showed that most of the clouds west and east of the accident site did not propagate eastward with time with the mean wind but remained relatively stationary, which was consistent with mountain wave activity. Low cloud bands immediately south of the accident also remained relatively stationary and were likely rotor clouds, a type of cloud associated with severe or greater turbulence. It is likely the airplane encountered severe to extreme low altitude turbulence associated with rotor clouds, which resulted in the loss of control.

Analysis

Primary failure mode
Loss of control
First missed decision gate
Pilot could have aborted the drop due to adverse weather conditions.

NTSB coding

Evidence available

  • Video
  • FDR / data
  • ADS-B / radar
  • Photos
  • 16 docket documents
View NTSB final reportView NTSB docket

Docket documents16

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