TAS calculation

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  • #30221

    What will be the TAS if cruising altitude is 39000ft, temperature is ISA +5 and CAS 200 kt?

    #30243
    Anthony Foxcroft
    Moderator

    Hi Jonathan,

    Using the E6B or CRP5 I get a TAS of 380 knots. With a CX2 I get 381.6 knots. For both the “trick” to this question is the temperature as 39000 feet is above the tropopause in ISA so you should use a temperature of -51.5 and not -58 if you had forgotten about the tropopause.

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