AI.X.B.K7cFAA-S-ACS-25 · Nov 2023Knowledge
c. Flaps extended/operating speed, if applicable
Airspeeds specific to the airplane for various operations, how to identify them on the airspeed indicator (if applicable), and their significance in airplane performance, including: c. Flaps extended/operating speed, if applicable
Bottom line
VFE is the highest speed permissible with the wing flaps in a prescribed extended position. For airplanes, the flap operating range is depicted by the white arc on the airspeed indicator, with the upper end at VFE. VFE exists because of the air loads imposed on the structure of the flaps.
Key numbers
| Number | What it means |
|---|---|
| VFE — upper end of the white arc | White arc top |
| VS0 — flaps and gear in landing configuration | White arc bottom |
FAA references
- PHAK ch. 11 (p. 11-19) — FAA-H-8083-25C (2023)
- PHAK ch. 9 (p. 9-2) — FAA-H-8083-25C (2023)
- PHAK Glossary (p. G-33) — FAA-H-8083-25C (2023)
- AFH ch. 18 (p. 18-9) — FAA-H-8083-3C
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