Here is another question for my PPL Exam. If anyone can illuminate me with explaining every step to achieve TAS with given parameters, it would be great.

Given: Calibrated airspeed (CAS): 155 kt. Flight level (FL) 80. Outside air temperature (OAT): -15° C. The true airspeed (TAS) equals...

When seeing this question there is only one thing is coming up to my mind and which is: Temperature drops 2° C every 1000 ft but I cannot connect the dots to find TAS.

  • $\begingroup$ This answer can help you. All you need to do is convert the FL into a pressure and plug the numbers into the formula given in that answer... $\endgroup$ – Bianfable May 26 '19 at 10:24

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