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Icefire means that Indicated Airspeed (IAS) is less than True Airspeed (TAS) at altitudes > 0, the higher you go the more the divergence between the two.
It does not mean that you're flying slower - there should be a IAS/TAS vs altitude chart for the a/c that you can consult, to get an idea of the relationship between the two indicators. ![]()
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