The AI-powered English dictionary
uncountable
(aviation) The minimum Mach number at which the airflow over some part of an aircraft reaches the speed of sound. quotations examples
Many high performance aircraft are equipped with a Machmeter for monitoring Mcrit. The Machmeter is essentially an airspeed instrument that is calibrated in relation to Mach on the dial.
2012, Aviation Maintenance Technician Handbook-Airframe Volume 2, FAA
Englia