CAS to TAS with your flight computer
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Set pressure altitude in the window opposite the OAT in Celsius.
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Without moving the computer’s scales, read TAS on the outer scale opposite to CAS.
If the aircraft is flying in excess of 300 kts, a larger uncorrected compressibility error rises.
Any conversion from CAS to TAS results in TAS higher than 300 kts a a correction has to be made using the compressibility factor or using the compressibility window in your flight computer.
Standard temperature FL100, 15 - 2 x 10 = -5º C. OAT = -5º + 10º = +5º C
Set the OAT against the PA, and opposite to TAS 150 and 105 read CAS 127 and 89 kts respectively. 127 - 89 = 38 kts
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