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23 - ATPL - For the same TAS, when pressure altitude decreases below the tropopause:

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

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.

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