EASA NAV(A)advanced
Select ALL correct statements about altitude and airspeed.
Answer
TAS generally exceeds IAS at altitude, Cold air can make true altitude lower than indicated by pressure-based reference, Transponder Mode C reports pressure altitude
Explanation
At altitude, lower air density means TAS is generally greater than IAS for the same instrument reading. In colder-than-standard air, true altitude can be lower than the altimeter-indicated altitude. Mode C transmits pressure altitude, not QNH or radio altitude. **Key takeaway:** Know which airspeed and altitude reference each instrument reports.\n\n**Glossary:** **IAS**: indicated airspeed; **pressure altitude**: altitude referenced to standard pressure; **true altitude**: actual height above mean sea level.
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