Definition
A category of stress caused by conditions acting on the body, such as fatigue, lack of sleep, missed meals, dehydration, noise, vibration, extreme temperatures, or exposure to oxygen-thin air at altitude. These physical factors degrade a pilot's performance even when no emotional or mental pressure is present.
Plain English
Stress that comes from what the body is going through — being tired, hungry, cold, hot, dehydrated, or worn down — rather than from worry or workload.
Context Anchor
Seen in aviation human-factors and stress-management discussions, especially when evaluating whether a pilot, student, or instructor is fit to fly or continue a lesson.
Derivation
Physical comes from a Greek word meaning “nature” or “the body.” Stress comes from an older word meaning “to draw tight” or “put pressure on.” Together, the term points to pressure placed on the body, not just pressure on the mind.
Why Pilots Care
Unresolved physical stress slows reaction time, narrows attention, and raises the chance of errors that can compromise safety of flight.
Grounding Statement
If your body is fighting heat, sickness, pain, thirst, or exhaustion, less of your attention is available for flying or teaching well.
Intuition Check
Physical stress does not only mean an injury or hard exercise. In aviation, it includes any body-related strain that can affect performance, including fatigue, heat, illness, hunger, thirst, noise, or vibration.
Example Sentence 1
After a long drive to the airport in hot weather without lunch, the instructor postponed the lesson to avoid flying under physical stress.
Example Sentence 2
High cabin temperatures created physical stress that made the student pilot slower to respond to heading changes.