Fatigue deteriorates cognitive functions, often with little warning. That’s the danger. Studies have shown that trying to function after staying awake for 18 hours is like having a blood alcohol content of .05 percent. You wouldn’t drive with such impairment, so why would you fly or perform aircraft maintenance?
It’s a sobering analogy that puts fatigue into stark perspective and easily shows how operating with weary flight crews and tired technicians might prove deadly. READ MORE (NBAA - Business Aviation Insider)