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What is the maximum indicated airspeed of a Boeing 767 below 10,000'?
510 kts at 400 m in standard atmospheric conditions equals Mach 0.775. This is well within the limits of the Boeing 767. But at 400 m it produces a dynamic pressure of 40,567 N/m², and that is too much. The maximum dive speed vD of the 767 is 420 kts.

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