Samenvatting
Sixteen instrument-rated pilots, eight of whom were very experienced professional aviators, flew Instrument Landing System approaches in a Cessna 172 under simulated instrument flight conditions while sober as well as under the influence of 40,80, and 120 mg% of blood ethyl alcohol. Note was made of procedural errors committed during the flight, after which it is concluded that even 40 mg% of blood alcohol exerts decremental effects on performance which are incompatible with flight safety.