Definition
A condition in which a pilot becomes partially or completely unable to perform required flight duties due to a sudden or gradual physical or mental impairment. Causes include illness, fatigue, hypoxia, dehydration, medication side effects, food poisoning, heart attack, stroke, or loss of consciousness. Incapacitation may be obvious (collapse, unresponsiveness) or subtle (confusion, slowed reactions, impaired judgment), and the subtle form is often the more dangerous because it can go unrecognized.
Plain English
When a pilot is no longer able to fly the airplane safely because something is wrong with them physically or mentally. It can be sudden, like passing out, or gradual, like becoming confused or sluggish without realizing it.
Context Anchor
Seen in safety discussions about collision avoidance, crew coordination, and what to do if the person flying can no longer safely fly the airplane.
Derivation
From Latin 'in-' (not) and 'capax' (able) -- literally 'made unable.' In aviation, it refers to the pilot being made unable to fly the aircraft, whether briefly, partially, or fully.
Why Pilots Care
It poses a serious risk of loss of aircraft control or collision with other traffic if not recognized and managed immediately.
Grounding Statement
Pilot incapacitation means the person expected to fly the airplane is no longer able to do that job safely.
Intuition Check
Do not assume pilot incapacitation only means the pilot is unconscious. A pilot can be incapacitated while awake if illness, confusion, pain, or another problem prevents safe flying.
Example Sentence 1
After feeling lightheaded and unusually warm, the pilot recognized early signs of incapacitation and diverted to the nearest suitable airport.
Example Sentence 2
Procedures for pilot incapacitation include securing the controls and declaring an emergency if the other pilot becomes unresponsive.