EASA NAV(A)advanced
At FL 75, OAT −9°C, and QNH altitude 6500 ft, what true altitude is given by the source question?
Answer
6250 ft
Explanation
The source question keys 6250 ft. The underlying principle is that in colder-than-standard air, true altitude is lower than the altitude indicated for the pressure level. Exact operational correction requires the applicable temperature and altitude-correction method. **Key takeaway:** Cold air can make true altitude lower than indicated altitude. **Glossary:** **True altitude**: Vertical distance above mean sea level; **OAT**: Outside air temperature; **QNH**: Pressure setting for altitude above mean sea level.
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