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Which of the following factors are not constant in cruise method 2?

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Which of the following factors are not constant in cruise method 2?

(a) altitude

(b) relative airspeed

(c) mach number

(d) angle of attack

The question was asked during an online exam.

Asked question is from Cruise Method 2 in chapter Cruising Performance of Aircraft Performance

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The correct choice is (c) mach number

Easiest explanation: Cruise method 2 also known as constant angle of attack and constant altitude method. In cruise method 2 altitude, the ratio of lift to drag and relative airspeed are kept constant i.e. L/D ratio and u and h are constant throughout the method.

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