BuffetAndVibration

Buffeting is a dynamic structural loading caused by unstable aerodynamic flow. High speed buffet is associated with shock wave formations at high Mach speeds when local flow separation occurs behind the shock. This can cause some vibrations in structure and it is required that there will be no buffeting conditions in normal flight severe enough to:

• Interfere with control of the aircraft.
• To cause excessive fatigue to the crew
• To cause structure damage

Aircraft must be shown in flight to be free from excessive vibration under any speed up to design dive speed of the aircraft.