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509 - FAA PPL(A) USA - Possible mountain wave turbulence could be anticipated when winds of 40 knots or greater blow

Question 509 - Preflight Preparation - FAA PPL(A) - Private Pilot Airplane

down a mountain valley, and the air is unstable
across a mountain ridge, and the air is stable
parallel to a mountain peak, and the air is stable

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Training tests and timed exam simulations FAA PPL(A) - Private Pilot Airplane