TAS is obtained from the CAS by correcting for the:
1 – instrument error
2 – compressibility error
3 – position
4 – density
The combination that regroups all of the correct statements is…
CAS is already corrected for instrument and position errors. To obtain TAS from CAS we need to correct for compressibility and get the EAS and then correct the EAS for density error to obtain the TAS.
The dynamic pressure is a function of airspeed and density of the air. The ASI being calibrated for ISA conditions, any other air density will indicate an erroneous airspeed on the ASI. For instance, density reduces with increasing altitude and the IAS, and thus EAS will become progressively lower than the TAS.
The dynamic pressure is a function of airspeed and density of the air. The ASI being calibrated for ISA conditions, any other air density will indicate an erroneous airspeed on the ASI. For instance, density reduces with increasing altitude and the IAS, and thus EAS will become progressively lower than the TAS.
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