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Total air temperature differs from static air temperature by

  • A.The ram rise caused by bringing the air to rest
  • B.The lapse rate correction
  • C.The compressibility correction to airspeed
  • D.The instrument's position error

Answer: A

Adiabatic compression at the probe raises the sensed temperature above the ambient value, and the rise grows with the square of Mach number. The air data computer subtracts it to recover the static temperature that true airspeed calculations need.

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