flight operationsFAA-published question bank (Private Pilot, 2008)
The greatest vortex strength occurs when the generating aircraft is
A
light, dirty, and fast.
B
heavy, dirty, and fast.
C
heavy, clean, and slow.✓ Correct Answer
Explanation
AIM 7-4-3 explains that vortex strength depends on the weight, speed and wing shape of the generating aircraft, and is greatest when it is heavy, clean (flaps and gear up) and slow, because the wing is then at a high angle of attack. Flaps and speed both tend to weaken the vortices, so dirty or fast configurations are not the worst case.
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