Can planes land on a flooded runway?

Whilst most aircraft can travel through water on the runway to a certain depth, it can get too deep. If it gets too deep, the aircraft is unable to brake sufficiently to stop the aircraft on landing. If necessary, the pilots would receive regular updates on the state of the runway and delay landing if needed.



No, commercial airplanes cannot safely land on a "flooded" runway, and such conditions will almost always trigger an immediate airport closure or a flight diversion. While aircraft are designed to handle rain and "wet" runways, standing water poses the extreme risk of hydroplaning (or aquaplaning). This occurs when a layer of water builds up between the aircraft tires and the runway surface, causing the plane to lose traction and rendering the brakes and nose-wheel steering ineffective. This can lead to a "runway excursion," where the plane slides off the side or end of the runway. Aviation regulations specify strict limits for "water depth" on a runway; typically, if standing water exceeds 3mm (1/8 inch) over more than 25% of the runway, it is considered "contaminated." Pilots receive "Field Condition" (FICON) reports that categorize the braking action from "Good" to "Nil." If the report is "Nil," landings are strictly prohibited. Modern runways are built with "grooving" and a convex "crown" to drain water rapidly, but in cases of flash flooding or tropical storms, the drainage system can be overwhelmed, making a safe landing physically impossible until the water recedes.

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