PA.IV.C.K3FAA-S-ACS-6C · Nov 2023Knowledge
Appropriate airplane configuration.
Appropriate airplane configuration.
Bottom line
If during a soft-field takeoff and climb, for example, the pilot attempts to climb out of ground effect without first attaining normal climb pitch attitude and airspeed, the airplane may inadvertently enter the region of reversed command at a dangerously low altitude. Even with full power, the airplane may be incapable of climbing or even maintaining altitude.
Key numbers
| Number | What it means |
|---|---|
| 70 percent of lift-off airspeed by runway midpoint, if runway length is appropriate for takeoff | Lift-off speed |
FAA references
- AFH ch. 2 (p. 2-22) — FAA-H-8083-3C
- PHAK ch. 11 (p. 11-12) — FAA-H-8083-25C (2023)
- AIM 7-6-8 (Use of Runway Half-way Signs at Unimproved Airports) — AIM Basic 2/20/25 w/ Change 1 (8/7/25) & Change 2 (1/22/26)
- AFH ch. 9 (p. 9-28) — FAA-H-8083-3C
- PHAK Glossary (p. G-34) — FAA-H-8083-25C (2023)
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