What about at sea level on a standard day?
I see your point! No, in that case EAS=CAS.
I based all my assumptions from theory and never checked the actual formulas to see that CAS and EAS are actually only density and pressure related.
Ok, I understand the forms but can't really figure it out.. How is it that at higher alts a so called density error is caused in the pitot tube by the increased speed and it can't be caused at Sea Level ISA conditions? (Assume again CAS=IAS for simplicity reasons). Put simply, why can't an a/c fly fast enough to create this compr.error in the pitot at SL ISA?