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Old 8th September 2006 | 01:10
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Mad (Flt) Scientist
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From: La Belle Province
Pedantically, if there is an airspeed being indicated to the pilot, that is "Indicated Airspeed".

However, the (unrealised) goal of every Air Data System (including the ADC as a component) to to present a value to the pilot which is as free from error as possible. Therefore, for a 'good' system, it will often be stated that the displayed term is 'Calibrated Airspeed', but this is more a statement of a design objective than a perfectly factual statement.

While Air Data Systems are entirely capable of calculating other airspeeds (such as EAS or TAS) these are not the terms usually displayed to the crew as "airspeed" on the "airspeed tape", even if they may be available through various display options on other pages of a display system.
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