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Refer to figure.
A jet transport aeroplane with a mass of 100 tons carries out a steady level 50 degree bank turn at FL320. The buffet free speed range extends approximately from…

  • A
    M = 0.65 to M > 0.84.
  • B
    M = 0.72 to M > 0.84.
  • C
    M = 0.74 to M = 0.84.
  • D

    M = 0.70 to M > 0.84.

Refer to figure.
Enter the diagram at the 50° of bank mark in the bottom right hand corner of the diagram.

Draw a line up to the 100 tones mass line.

Draw a horizontal line to the left to cut the FL320 curve.

At this point read off the Indicated Mach No on the bottom left hand scale of the diagram = 0.65. This is the point at which Low speed buffeting will begin.

The horizontal line we drew does not cut the FL320 line as it slopes down at the right-hand side of the Indicated Mach No scale. This means that we cannot determine the high-speed buffeting Mach No because it is off the scale. All we can say is that it will occur at a greater Mach No than the 0.84 M where the scale ends.

Mach 0.84 is the aircraft’s MMO, which is the speed limit set to avoid High Speed Buffet.

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