Pilot Debrief

CIRRUS DESIGN CORP SR22 near Tooele, UT — 2015-01-09

Final reportWPR15FA082
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Date
2015-01-09
Location
Tooele, UT, USA
Aircraft
CIRRUS DESIGN CORP SR22
Registration
N383GM
Category
Airplane
Highest injury
Fatal
Fatalities
1
Phase of flight
Climb

Probable cause

The non-instrument rated pilot’s decision to depart into low visibility conditions, which resulted in spatial disorientation and a loss of control. Contributing to the accident was the pilot’s impaired performance due to his use of the sedating antihistamine, diphenhydramine.

Contributing factors

Contributing to the accident was the pilot's impaired performance due to his use of the sedating antihistamine, diphenhydramine.

NTSB narrative

The noninstrument-rated private pilot departed during the late afternoon and flew over the southern portion of the Great Salt Lake. According to data recovered from the airplane's avionics system, which did not capture altitude, the duration of the flight was about 9 minutes. During the final minute of the flight, the airplane conducted a gradual left turn at an engine power setting of about 2,200 rpm. Shortly thereafter, the airplane impacted the lake. Postaccident examination of the airplane revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. Local meteorological observations indicated that restricted visibility and fog were forecast throughout the area about the time of the accident. It is likely that the pilot encountered these conditions inflight and lost visual reference to the ground and/or horizon. Given the pilot's lack of an instrument rating and of recent instrument flight experience, the loss of visual reference likely resulted in spatial disorientation. Toxicological testing on the pilot revealed the presence of bupropion, an antidepressant; hydrocodone, an opiod analgesic; and diphenhydramine, a sedating antihistamine. The investigation was unable to determine if the use of bupropion or the cognitive effects of any underlying depression contributed to the accident. Because the hydrocodone was found in the urine but not the blood, it no longer caused systemic effects and played no role in the accident. However, it is likely that the effects of diphenhydramine impaired the pilot's cognitive and psychomotor performance at the time of the accident, and contributed to his spatial disorientation.

Analysis

Primary failure mode
Spatial disorientation
First missed decision gate
Pilot could have aborted the flight due to fog conditions near the lake.

NTSB coding

Evidence available

  • 12 docket documents
View NTSB final reportView NTSB docket

Docket documents12

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