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split flap

noun, Aeronautics
1.
a flap that is located on the under surface of the trailing edge of an aircraft wing and that splits away from the wing structure when rotated downward, producing an increase in lift or drag or both.
Compare landing flap.
2.
a flap that is located on the upper surface of the trailing edge of an aircraft wing and that acts as a spoiler when rotated upward.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for split flap
  • The split flap was designed to increase lift and enabled a pilot to reduce the plane's speed in a steep dive.

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