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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Principles of Flight > At unchanged mass and configuration, how can indicated stall speed vary with altitude, if compressibility becomes significant at high altitude?

86 - ATPL Question Bank in English - At unchanged mass and configuration, how can indicated stall speed vary with altitude, if compressibility becomes significant at high altitude?

Question 86 - Principles of Flight - ATPL - Airline Transport Pilot Licence

It is approximately constant in the incompressible range, but can increase where compressibility reduces CLmax.

It remains constant at lower altitudes but decreases at higher altitudes due to compressibility effects

It increases with increasing altitude, because the density decreases

It must always remain constant, even if compressibility changes CLmax.

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