FAA Sport Pilot Airplane (SPA)Human Factors and ADMHard
A pilot skips drinking water throughout a hot day of flight instruction, relying only on coffee between lessons. By the final flight, the pilot experiences a headache, fatigue, and difficulty concentrating despite adequate sleep and no illness. These symptoms are most likely caused by which factor?
- ACarbon monoxide poisoning
- BHypoxic hypoxia
- CHyperventilation
- DDehydration
Show answer & explanationAnswer & explanation
Correct answer: D. Dehydration
Dehydration, worsened by heat and diuretics like caffeine, reduces blood volume and impairs cognitive and physical performance, producing headache, fatigue, and difficulty concentrating. Adequate water intake throughout the day, rather than caffeinated beverages alone, helps prevent these symptoms.
Why the other options are wrong
- A. Carbon monoxide poisoning typically involves an exhaust or heater source and causes similar symptoms but isn't indicated here.
- B. Hypoxic hypoxia results from insufficient oxygen at altitude, not from fluid intake or heat exposure on the ground.
- C. Hyperventilation causes rapid breathing with tingling and lightheadedness from CO2 loss, not linked to fluid intake.
Dehydration
A deficiency of body water that impairs physical and cognitive performance, often worsened by heat, altitude, and diuretics like caffeine or alcohol.
- Symptoms include headache, fatigue, dizziness, and poor concentration
- Heat, low humidity, and caffeine/alcohol accelerate fluid loss
- Pilots should drink water regularly throughout the day, not just when thirsty
Memory trick: No water, no wits — hydrate before you fly.