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Instrument Flying Handbook Menu>Human
Factors>Illusions
Leading to Spatial Disorientation>Inner Ear
A condition called the leans can result when
a banked attitude, to the left for example, may be entered too
slowly to set in motion the fluid in the “roll”
semicircular tubes. [Figure 1-2] An abrupt correction of this
attitude can now set the fluid in motion, creating the illusion
of a banked attitude to the right. The disoriented pilot may
make the error of rolling the aircraft into the original left-banked
attitude or, if level flight is maintained, will feel compelled
to lean to the left until this illusion subsides.
Figure 1-2. Angular acceleration.
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