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6 - ATPL - Calibrated Air Speed (CAS) is obtained from Indicated Air Speed (IAS) by correcting for the:

Question 6 - Aircraft General Knowledge - Instrumentation - ATPL - Airline Transport Pilot license

Position and instrument errors.
Position and density errors.
Density error.
Instrument error.

Training tests and timed exam simulations ATPL - Airline Transport Pilot license