Under what conditions are following relationship valid VCAS

Under what conditions are following relationship valid? V_CAS = V_EAS = V_TAS V_CAS = V_EAS notequalto V_TAS V_CAS notequalto V_EAS = V_TAS

Solution

At sea level: V_CAS = V_EAS = V_TAS

If the pressure is maintained same as of the pressure at sea level, but plane is infact not at sea level (Temperature is different), then V_CAS = V_EAS != V_TAS

If the temperature is mantained same as of the temperature at sea level, but plane infact is not at sea level (Pressure is different), then V_CAS != V_EAS = V_TAS