An aircraft flying below the tropopause descends at a constant True Airspeed. Its Mach. No. will
- not change.
- increase.
- decrease.
Explanation
Mach number is true airspeed divided by the local speed of sound, and the speed of sound depends on temperature. Descending below the tropopause means warmer air, so the local speed of sound increases. With TAS held constant, dividing by a larger speed of sound gives a smaller Mach number, so it decreases.
subufer asking:
True airspeed/speed of sound = mach number. So if descending below tropopause doesn’t it mean that Mach number will increase at constant aircraft airspeed? Since the temperature will rise?
Or I am getting it wrong?
Community Comments (2)
S
subufer Posts: 6 19.06.2022 / 22:00
Never mind. I got it
A
Agnes Posts: 1 24.08.2022 / 10:50
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