Airspeeds & Mach
See how IAS, CAS, EAS, TAS and Mach number relate at any height and temperature, and where the climb crossover is
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- Move the altitude slider with a fixed IAS and watch TAS and Mach grow while CAS stays the same.
- Switch to I know the Mach number to see how CAS falls as you climb at a constant Mach.
- Raise the temperature above standard and see the speed of sound, the TAS and the Mach number change.
- Change the climb schedule numbers and see the crossover altitude move on the chart.
Exam point
The chain is IAS, then CAS (remove instrument and position error), then EAS (remove compressibility), then TAS (correct for density). Mach number is TAS divided by the local speed of sound, which depends only on temperature.
Study aid only. Figures here are simplified and fictional, so always use current DGCA and ICAO documents and the approved manual for real operations.