IAS or CAS
Was reading up on performance recently and found a passage that says aircraft which have an air data computer (that interprets raw data and process it in some way before displaying it as flight parameters) will automatically display CAS on the PFD rather than IAS. I.e. the computers do the calculation from IAS to CAS. So basically that speed we're looking at is CAS not IAS .
At the same time I can't find any proof either way in my aircraft manuals. Can anyone clarify this?