a. Army aircrew members must have optional physiological and psychological fitness in order to perform their duties. (The term "aircrew members" applies here to any individual involved in the flight operation of aircraft, including, when medically appropriate, air traffic controllers.)
b. Apart from pathological conditions, fitness may be adversely affected by variety of exogenous factors, the effects of which may be hardly perceptible and therefore negligible in everyday activities; however, these same factors may have a considerable effect on aircrew efficiency.
c. The return to flight duty of aircrew members by a flight surgeon may be accomplished telephonically in those instances where a flight surgeon is not assigned to any unit at a given installation. This clearance will be recorded in the medical record and on DA Form 4186 (Medical Recommendation for Flying Duty).