When is it prohibited to land at an airport due to runway conditions?

The correct answer is that landing is prohibited at an airport due to runway conditions when there is greater than 0.5 inch of wet snow. This is because wet snow can significantly affect the aircraft's landing capabilities. It creates a slippery surface that can lead to reduced braking effectiveness and increase the risk of hydroplaning, making it more difficult for pilots to maintain control during the landing phase.

Wet snow poses a much greater hazard compared to dry snow, as it can create a slushy layer that can reduce friction between the aircraft's tires and the runway surface. Understanding these conditions is vital for ensuring safety during operations, especially under Part 135 regulations, which require compliance with specific airport landing criteria.

In contrast, landing may still be feasible with conditions involving 0 inches of dry snow, less than 2 inches of dry snow, or less than 1 inch of wet snow because these levels are often manageable and do not typically pose significant safety risks. Therefore, maintaining awareness of specific runway conditions is crucial for flight operations management.