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Home > Exam Questions > ATPL - Airline Transport Pilot license > Aircraft General Knowledge - Instrumentation > For the same TAS, when pressure altitude decreases below the tropopause:

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.

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