ATPL: For the same TAS, when pressure altitude increases below the tropopause:
Domanda 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. |
