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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Principles of Flight > The critical Mach number for an aerofoil equals the free stream airfoil Mach number at which:

126 - ATPL Question Bank in English - The critical Mach number for an aerofoil equals the free stream airfoil Mach number at which:

Question 126 - Principles of Flight - ATPL - Airline Transport Pilot Licence

The maximum operating temperature is reached.

A shock-wave appears on the upper surface.

The local airflow first reaches sonic speed (M = 1) at some point on the aerofoil.

The entire airflow around the aerofoil becomes supersonic.

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