AviationTire Principles Of Flight - Aeroplane Transonic Aerodynamics Means to avoid the effects of exceeding Mcrit Q 1 / 5

What is the influence of decreasing aeroplane weight on Mcrit at constant IAS?

Mcrit increases as a result of flying at a smaller angle of attack.
Mcrit increases as a result of compressibility effects.
Mcrit decreases.
Mcrit decreases as a result of flying at a greater angle of attack.