CA.VII.E.K1FAA-S-ACS-7B · Nov 2023Knowledge
Aerodynamics associated with spins in various airplane configurations, including the re...
Aerodynamics associated with spins in various airplane configurations, including the relationship between angle of attack, airspeed, load factor, power setting, airplane weight and center of gravity, airplane attitude, and yaw effects.
Bottom line
The direct cause of every stall is an excessive angle of attack (AOA). A stall is the result of exceeding the critical AOA, not of insufficient airspeed. It is possible to stall the wing at any airspeed, at any flight attitude, and at any power setting.
Key numbers
| Number | What it means |
|---|---|
| 16°–20° depending on the airplane design | Critical AOA |
| Load factor 2.0 in a level altitude 60° banked turn | 60° bank |
| Load factor 1.41 in a level altitude 45° banked turn | 45° bank |
| 41 percent higher than the 1G stall speed in a coordinated, level 60° banked turn | 2G stall speed |
| Load factor up to 3.8 for standard category general aviation airplane design | Standard category |
FAA references
- AFH ch. 1 (pp. 1-13–1-14) — FAA-H-8083-3C
- AFH ch. 5, Angle of Attack; Coordinated Flight (pp. 5-8–5-9) — FAA-H-8083-3C
- AFH ch. 10 (p. 10-2) — FAA-H-8083-3C
- RMH Glossary — FAA-H-8083-2A
- PHAK Glossary — FAA-H-8083-25C (2023)
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