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23 - ATPL Question Bank in English - For the same TAS, when pressure altitude decreases in the International Standard Atmosphere below the tropopause:

Question 23 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot Licence

Mach number remains constant.
The difference between surrounding conditions and ISA must be known to deduce the Mach number variation.
Mach number increases.
Mach number decreases.

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