Why is pilot fatigue considered a hazard?

Pilot fatigue is considered a hazard primarily because a fatigued pilot is an impaired pilot. Fatigue negatively affects a pilot's cognitive function, alertness, and physical abilities, which are all essential for safe flying operations. When a pilot is fatigued, they may experience reduced situational awareness, slower reaction times, and compromised decision-making skills. This impairment can lead to errors in judgment and increased likelihood of accidents or incidents, particularly in high-stress environments or during complex flight maneuvers. Recognizing and addressing fatigue is crucial in aviation safety, as it directly impacts a pilot's performance and overall flight safety.