asleep or had a seizure, but there was no direct evidence to support these theories. The report was critical of the Federal Aviation Administration's re-certification process, stating:The Federal Aviation Administration's internal guidance for medical certification of pilots following stroke is inadequate because it is conflicting and unclear, does not specifically address the risk of recurrence associated with such an event, and does not specifically recommend a neuropsychological evaluation (formal cognitive testing) to evaluate potential subtle cognitive impairment. The report went on to note that the airplane was equipped with a Terrain Awareness and Warning System, but that the pilot had elected to fly with the system turned off. Because much of Alaska's terrain is highly variable, bush pilots will often de-activate the system, as it issues many false warnings. References External links NTSB Factual Report ANC10MA068 NTSB Final Report NTSB Briefing of Accident ANC10MA068 — Probable Cause findings Turbo Otter crash Accidents and incidents involving the de Havilland Canada DHC-3 Otter Turbo Otter crash Aviation accidents and incidents in the United States in 2010 Turbo Otter crash 2010 August 2010 events in the United States