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Instrument Flying Handbook Menu>Human
Factors>Sensory
Systems for Orientation >Nerves
Nerves in the body’s
skin, muscles, and joints constantly send signals to the brain,
which signals the body’s relation to gravity. These signals
tell the pilot his/her current position. Acceleration will be
felt as the pilot is pushed back into the seat. Forces created
in turns can lead to false sensations of the true direction
of gravity, and may give the pilot a false sense of which way
is up.
Uncoordinated turns, especially climbing turns,
can cause misleading signals to be sent to the brain. Skids
and slips give the sensation of banking or tilting. Turbulence
can create motions that confuse the brain as well. Pilots need
to be aware that fatigue or illness can exacerbate these sensations
and ultimately lead to subtle incapacitation.
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