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20 - ATPL - If OAT increases when at a constant TAS:

Question 20 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

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

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