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129 - ATPL Question Bank in English - Which statement is correct about the effect of an aileron on a transonic wing shock wave?

Question 129 - Principles of Flight - ATPL - Airline Transport Pilot Licence

The shock always reaches its greatest strength exactly at the critical Mach number.
Aileron deflection can alter shock position and strength; the resulting control effectiveness depends on the flow and any shock-induced separation.
The shock is always at the point of maximum wing thickness when the free-stream Mach number reaches 1.
The shock must always move forward whenever the free-stream Mach number is increased.

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