AI.XIII.B.S5
SkillRecognize and recover at the first indication of loss of directional control, stall warning, or buffet.
From the FAA library
- Chapter 5: Aerodynamics of Flight › Boundary Layer Separation › Mach Buffet Boundaries
There are also occasions when the buffet can be experienced at much lower speeds known as the “low-speed Mach buffet.” An aircraft flown at a speed too slow for its weight and altitude necessitating a high ... most likely situation to cause a low-speed Mach buffet. This very high AOA has the effect of increasing airflow velocity over the upper surface of the wing until the same effects of the shock waves and buffet occur…
- Chapter 16: Transition to Jet-Powered Airplanes › Mach Buffet
known as “coffin corner.” 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. An increase in load factor (G factor) will raise ... buffet speed. For example, a jet airplane flying at 51,000 feet altitude at 1.0 G and a speed of 0.73 Mach that experiences a 1.4 G load, may encounter low-speed buffet. Consequently, a maximum cruising flight altitude…
- Chapter 5: Aerodynamics of Flight › High Speed Flight › Speed Ranges
number is an important point in transonic flight. When shock waves form on the aircraft, airflow separation followed by buffet and aircraft control difficulties can occur. Shock waves, buffet, and airflow separation take place above critical Mach number ... above the critical Mach number, compressibility effects begin. Drag begins to rise sharply. Associated with the “drag rise” are buffet, trim, and stability changes and a decrease in control surface effectiveness. This is the point of “drag divergence.” [Figure…
- Chapter 5: Aerodynamics of Flight › Boundary Layer Separation › Sweepback
other hand, provides stall warning when the airspeed is five to seven percent above stall speed. Mach Buffet Boundaries Mach buffet is a function of the speed of the airflow over the wing—not necessarily the speed of the aircraft ... wing, whether from too fast an airspeed or from too high an AOA near the MMO, the “high-speed” buffet occurs. There are also occasions when the buffet can be experienced at much lower speeds known as the “low-speed…
- 14 CFR Part 91, Appendix G to Part 91—Operations in Reduced Vertical Separation Minimum (RVSM) Airspace
RVSM altitude limit); (ii) The maximum certificated altitude for the aircraft; or (iii) The altitude limited by cruise thrust, buffet, or other flight limitations. (2) The airspeed flight envelope extends: (i) From the airspeed of the slats/flaps-up maximum endurance (holding ... maneuvering airspeed, whichever is lower; (ii) To the maximum operating airspeed (Vmo/Mmo), or airspeed limited by cruise thrust buffet, or other flight limitations, whichever is lower. (3) All permissible gross weights within the flight envelopes defined in paragraphs…