THE TIME-COURSE OF ALCOHOL IMPAIRMENT OF GENERAL-AVIATION PILOT PERFORMANCE IN A FRASCA 141 SIMULATOR

This study examined the time-course of alcohol impairment of general a viation pilot simulator performance. We tested 14 young (mean age 25.8 years) and 14 older (mean age 37.9 years) pilots in a Frasca 141 simu lator during alcohol and placebo conditions. In the alcohol condition, pilots drank alcohol and were tested after reaching 0.10% BAL, and th en 2, 4, 8, 24, and 48 h after they had stopped drinking. They were te sted at the same times in the placebo condition. Alcohol impaired over all performance. Alcohol impairment also depended on the order in whic h subjects participated in the alcohol and placebo sessions, with larg er decrements for the alcohol-placebo order than for the opposite orde r. To examine the influence of alcohol independent of session order ef fects, we compared performance in the first alcohol session with perfo rmance in the first placebo session. This analysis showed that alcohol significantly reduced mean performance in the alcohol condition at 0. 10% BAL and at 2 h. In addition, alcohol increased variability in perf ormance in the alcohol session from 0.10% BAL to 8 h, suggesting that some subjects were more susceptible to alcohol than others. Older pilo ts tended to perform some radio communication tasks less accurately th an younger pilots.