Discussion
A transport aircraft cruises at Mach 0.82 and the crew notices the total air temperature indication is some 30 degrees above the forecast ambient temperature at that level.
What does this indicate?
Answer: B
The ram rise grows with the square of Mach number and is tens of degrees at high subsonic cruise. The air data computer removes it to recover the static temperature that true airspeed and speed of sound calculations require.
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