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Piper Arrow Airspeed Indicator – CAS or IAS?

Asked by: 894 views Aircraft Systems


It was a big surprise for me to notice that the colored airspeeds on the airspeed indicator correspond to CAS numbers shown in the POH (not the IAS numbers). Does this mean my airspeed indicator is actually showing me CAS, and if so, what's the point of the IAS to CAS conversion table in the POH?


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1 Answers

  1. Jordan on Aug 14, 2016

    Remember, CAS is IAS corrected for instrument and position error. Airspeed read from the indicator is always IAS. In other words, the airspeed indicator shows IAS, not CAS. In light GA aircraft, the difference between the two is usually negligible.

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