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runway surface condition descriptor
- Definição1
- One of the following elements on the surface of the runway: i) Compacted snow. Snow that has been compacted into a solid mass such that aeroplane tires, at operating pressures and loadings, will run on the surface without significant further compaction or rutting of the surface. ii) Dry snow. Snow from which a snowball cannot readily be made. iii) Frost. Frost consists of ice crystals formed from airborne moisture on a surface whose temperature is below freezing. Frost differs from ice in that the frost crystals grow independently and therefore have a more granular texture. iv) Ice. Water that has frozen or compacted snow that has transitioned into ice, in cold and dry conditions. v) Slush. Snow that is so water-saturated that water will drain from it when a handful is picked up or will splatter if stepped on forcefully. vi) Standing water. Water of depth greater than 3 mm. vii) Wet ice. Ice with water on top of it or ice that is melting. viii) Wet snow. Snow that contains enough water content to be able to make a well-compacted, solid snowball, but water will not squeeze out.
- Fonte1
- INTERNATIONAL CIVIL AVIATION ORGANIZATION. Annex 14 to the Convention on International Civil Aviation: aerodromes: volume 1: aerodrome design and operation. 8th ed. Montreal, 2018. (Annex 14).
- Nota adicional1
- Below freezing refers to air temperature equal to or less than the freezing point of water (0 degree Celsius).
- Nota adicional2
- Under certain conditions frost can cause the surface to become very slippery and it is then reported appropriately as reduced braking action.
- Nota adicional3
- Running water of depth greater than 3 mm is reported as standing water by convention.
- Nota adicional4
- Freezing precipitation can lead to runway conditions associated with wet ice from an aeroplane performance point of view. Wet ice can cause the surface to become very slippery. v
- Subárea1
- Safety
- Related Term
- dry runway
- slush
- wet runway
- Broader Term
- runway surface condition
- Português
- descritor da condição da superfície da pista de pouso e decolagem