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157 - ATPL - Mcrit is the free stream Mach Number at which:

Question 157 - Principles of Flight - ATPL - Airline Transport Pilot license

Somewhere about the airframe Mach 1 is reached locally.
The critical angle of attack is reached.
Shockstall occurs.
Mach buffet occurs.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license