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Considering the relationship between CAS and EAS:
  • A
    EAS may be lower or greater than CAS, depending on pressure altitude.
  • B
    EAS is always greater than or equal to CAS.
  • C
    EAS is always lower than or equal to CAS.
  • D
    EAS may be lower or greater than CAS, depending on air density.
The compressibility error is more important at higher pressure altitudes than at lower levels because air is more compressible in a lower density. Therefore, as soon as compressibility becomes an issue and is getting corrected, the EAS is equal to the CAS and then, is becoming increasingly lower than CAS.
 

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