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39 - ATPL - An aircraft flying at FL 100 from Marseille (QNH 1012 hPa) to Palma de Mallorca (QNH 1006 hPa) experiences no change to true altitude. The reason for this is that:

Question 39 - Meteorology - ATPL - Airline Transport Pilot license

The air at Palma de Mallorca is colder than that at Marseille
The altimeters are erroneous, and need to be tested
The air at Palma de Mallorca is warmer than that at Marseille
One of the two QNH values may be incorrect

Training tests and timed exam simulations ATPL - Airline Transport Pilot license