runway surface condition descriptors

‘runway surface condition descriptors’ means one of the following substances on the surface of the runway:

(a)compacted snow: snow that has been compacted into a solid mass such that aeroplane tyres, at operating pressures and loadings, will run on the surface without significant further compaction or rutting of the surface;

(b)dry snow: snow from which a snowball cannot readily be made;

(c)frost: ice crystals formed from airborne moisture on a surface whose temperature is at or below freezing; frost differs from ice in that frost crystals grow independently and therefore, have a more granular texture;

(d)ice: water that has frozen or compacted snow that has transitioned into ice in cold and dry conditions;

(e)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;

(f)standing water: water of depth greater than 3 mm;

(g)wet ice: ice with water on top of it or ice that is melting;

(h)wet snow: snow that contains enough water to be able to make a well compacted, solid snowball, but water will not squeeze out;