![]() The pilots performed a range of predefined maneuvers of varying difficulty without the aid of autopilot, and were assessed by a FAA Designated Pilot Examiner according to FAA Practical Test Standards. CO 2 concentrations were modified by introducing ultra-pure CO 2 into the simulator ventilation rates remained the same for each segment. We recruited 30 active commercial airline pilots to fly three 3-h flight segments in an FAA-approved flight simulator with each segment at a different CO 2 concentration on the flight deck (700, 1500, 2500 ppm). The only available data for CO 2 on the flight deck indicate that the average CO 2 concentrations are typically <1000 ppm, but the 95th percentile concentration can be as high as 1400 ppm, depending on airplane type. Recent studies suggest that carbon dioxide has an impact on cognitive function performance of office workers at concentrations previously thought to be benign (1000-2500 ppm). ![]()
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