ATPL Aero & Systems Practice Questions - CASA Airline Transport Pilot Licence (Aeroplane) - Aerodynamics & Aircraft Systems (AASA) Exam

The free-stream Mach number at which the local air velocity at some point on the airfoil first reaches the speed of sound. The Mach number at which the drag coefficient begins to rise rapidly due to shockwave formation. The speed at which the boundary layer separates completely from the upper wing surface. The Mach number at which the aircraft enters a state of uncontrollable nose-down pitch (mach tuck).