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5 - ATPL Question Bank in English - The mach number is the:

Question 5 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

Corrected airspeed (CAS) divided by the local speed of sound
Indicated airspeed (IAS) divided by the local speed of sound
True airspeed (TAS) divided by the local speed of sound
Equivalent airspeed (EAS) divided by the local speed of sound

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