The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The pilot’s improper decision to continue a visual flight rules flight into an area of limited visibility conditions, which resulted in spatial disorientation and a loss of airplane control.
Autopsy of the pilot revealed a dilated, enlarged heart; however, it is unlikely that the pilot’s heart disease contributed to the accident. Although toxicology testing indicated that the pilot had used the cannabis products delta-9 THC and cannabidiol, no detectable psychoactive cannabinoids remained in the pilot’s postmortem blood, and it is therefore unlikely that effects of his cannabis use contributed to the accident.
https://data.ntsb.gov/carol-repgen/api/ ... 105050/pdf
