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132 - ATPL - For the same TAS, when pressure altitude increases below the tropopause:

Question 132 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

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

Training tests and timed exam simulations ATPL - Airline Transport Pilot license