AA.V.B.K3FAA-S-ACS-11A · Nov 2023Knowledge
Factors and situations that can lead to a stall during cruise flight and actions that c...
Factors and situations that can lead to a stall during cruise flight and actions that can be taken to prevent it.
Bottom line
Emphasis should be placed on preventing conditions that may lead to a stall event. Conceivably, a buffet could be the first indication of an issue at altitude, and pilots should understand the cause of any buffet in order to respond appropriately.
Key numbers
| Number | What it means |
|---|---|
| Flow over the wing's upper surface may exceed Mach 1 at low-speed cruise | Mach 1 |
| Altitude where an airplane at MMO would buffet with any increase in AOA | MMO ceiling |
FAA references
- AC 120-109, para. 3-2, 4-2 — AC No: 120-109A
- AFH ch. 16 (p. 16-6) — FAA-H-8083-3C
- AC 120-109, para. 2-1 — AC No: 120-109A
- PHAK ch. 6 (p. 6-6) — FAA-H-8083-25C (2023)
- AFH ch. 3 (p. 3-24) — FAA-H-8083-3C
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