Answer :
Final answer:
In runway selection, it's critical to b) use the runway most nearly aligned with the wind when the wind speed is 5 knots or more, or the calm wind runway when the wind is less than 5 knots.
Explanation:
The main principle in runway selection is based on the wind direction and speed. The rule of thumb is to use the runway most nearly aligned with the wind when it's 5 knots or more (option b). When the wind is below 5 knots, the calm wind runway is chosen.
This is to ensure safer take-offs and landings, allowing the plane to descend at a slower ground speed and make better use of the runway's length. It is not advisable to choose a runway disregarding wind conditions (option c) or using a runway when a tailwind component exists (option d), as this would increase the risk. Noise reduction (option a) might be a factor in certain circumstances, but it is not a primary principle in runway selection.
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