SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/pilot-forward-slip-purpose

Why use a forward slip during an approach?

To lose altitude without increasing airspeed.

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  1. To climb without power
  2. To increase airspeed rapidly
  3. To lose altitude without gaining airspeed ✔

Why: Cross-controlled flight adds drag and increases the descent rate. A forward slip helps a high airplane descend toward the desired path without building excess airspeed.

Huh, didn't know that: The pilot normally reduces power to idle and controls airspeed with elevator.

The dad joke
The forward slip lost altitude but kept its speed to itself.
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References

Answer: To lose altitude without gaining airspeed. Cross-controlled flight adds drag and increases the descent rate. A forward slip helps a high airplane descend toward the desired path without building excess airspeed.

  1. FAA Airplane Flying Handbook, Chapter 9 www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/airplane_handbook/10_afh_ch9.pdf?pubDate=20260325
    A forward slip is used to dissipate altitude and increase descent rate without increasing airspeed.
    Checked 2026-10-09.

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