High altitude is an environment that is alien to man. Stressors associ
ated with the mechanics of flight include motion and acceleration forc
es applied in three vectors and in degrees that are foreign to the hum
an vestibular apparatus. Furthermore, the work patterns of a pilot can
interfere with lifestyle and circadian rhythms. Therefore medical fit
ness is an important consideration in determining an individual's suit
ability to exercise a pilot's Licence. The medical standards applied d
epend on the type of aircraft flown and the duties expected of a pilot
. There are three broad categories of pilot. In ascending order of str
ingency of medical standards these are the private pilot, the professi
onal pilot and the military pilot.