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The wake vortex hazard to a following aircraft is greatest when the generating aircraft is

  • A.Heavy, slow and in a clean configuration
  • B.Light, fast and with flaps fully extended
  • C.Heavy, fast and in a steep descent
  • D.Light, slow and in a steep bank

Answer: A

Vortex strength scales with the circulation the wing must generate, which is large when the weight is high and the speed is low, and the vortices stay compact and concentrated when the wing is clean. Air traffic separation rules are built around exactly this combination, and the phrase heavy, slow and clean is the standard summary.

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