CRP-5: How to calculate True Airspeed (TAS) 

Glad you enjoyed it. Thank you for the comment.

Good point, thank you

The Pitot Tube doesn't actually measure anything if we are being pedantic. The PT is an inlet which allows the flow of both Dynamic Pressure and Static Pressure to the instrument. Once in teh instrument, the Dynamic and Static pressure from the Pitot Tube are met with the Static Pressure from teh Static Pressure source and the calibrated equipment returns a value to the reading card on the instrument.....

I want to know it as well ;) ;) It is awesome :-)

I found only this: www.e6bx.com/e6b/ But it is not as that pretty :-/

yep, moreless under 180kias and above 18000ft, this were the agreed limits to start to consider the fluid compressible, at least when I took my exams some years ago

And what with temperature correction? For example I have FL120 IAS 200 OAT -5 So using your formula TAS is 248 kt. Correct is 242 - Too much diffrent

what is?

Beyond The Stars Because EASA say so. You're not always given all the information you require to answer a question. So regardless of whether you're asked to calculate it directly, you may need to.

oh ok , this the calculate for airline pilots only? or even private pilots?

Beyond The Stars It's mainly for the EASA ATPL theory exams that are required to be sat before commencing a CPL.

duh it looks a bit difficult to me , i am not good at maths

your plane speed increases by about 2% per 1000 feet due to less air resistance ,, but what it says on the instrument inside the plane stays the same .. so you need to know both speeds to calculate how much time it takes to get some where and what speed to fly the plane at