SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/pilot-split-flap-roll

If only one flap extends, which way does the airplane roll?

Toward the wing with less flap, countered with opposite aileron.

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  1. Toward the wing with more flap
  2. Toward the wing with less flap ✔
  3. It pitches up but does not roll

Why: An asymmetric or split flap gives one wing more lift than the other. The airplane rolls toward the wing with the least flap, and the pilot counters with opposite aileron and rudder.

Huh, didn't know that: The AFH says to fly a split-flap approach faster than normal and avoid a big flare, to stay clear of an asymmetric stall.

The dad joke
My flaps had a disagreement. Now they are not on speaking terms, or the same side.
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References

Answer: Toward the wing with less flap. An asymmetric or split flap gives one wing more lift than the other. The airplane rolls toward the wing with the least flap, and the pilot counters with opposite aileron and rudder.

  1. Airplane Flying Handbook FAA-H-8083-3C, Chapter 18 www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/19_afh_ch18.pdf
    indicated by a pronounced roll toward the wing with the least flap deflection
    Checked 2026-10-09.

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