Below the tropopause, when descending at constant CAS:

Question

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

QuizVDS · Accepted Answer

Mach number decreases and the velocity of sound increases.

QuizVDS · Answer

Mach number and the velocity of sound decrease.

QuizVDS · Answer

Mach number and the velocity of sound increase.

QuizVDS · Answer

Mach number increases and the velocity of sound decreases.

Id 14 - ATPL - Below the tropopause, when descending at constant CAS: