Definition
The bodily needs a pilot must meet to function safely in flight, including adequate oxygen, freedom from fatigue, proper hydration and nutrition, absence of impairing illness or medication, and protection from environmental stresses such as cold, heat, noise, vibration, and acceleration forces.
Plain English
What the pilot's body needs to keep working properly while flying — enough oxygen, rest, food, water, and freedom from anything that would slow the body or mind down.
Context Anchor
Seen in training and aeromedical discussions, especially when considering fatigue, illness, altitude, heat, motion sickness, or other body-related limits before or during flight.
Derivation
From Greek physiologia, meaning the study of how living bodies function. 'Physiological' refers to the body's normal workings, so 'physiological requirements' are the conditions the body needs to keep functioning normally — in this case, while flying.
Why Pilots Care
Unmet physiological requirements cause rapid impairment such as hypoxia or loss of consciousness, creating immediate safety risks.
Grounding Statement
If the airplane is ready but the pilot is exhausted, sick, or short of oxygen, the flight is still not truly ready.
Intuition Check
Do not read physiological requirements as just paperwork, training prerequisites, or medical forms. Here it means the pilot’s actual physical condition and body limits that affect safe flying.
Example Sentence 1
Before a long cross-country flight, the instructor reviewed the physiological requirements with the student, emphasizing rest, hydration, and supplemental oxygen above 12,500 feet.
Example Sentence 2
Recognizing when physiological requirements are not being met helps pilots respond to early hypoxia symptoms.