Je to indikace kontaminace drahy a brzdneho ucinku, tzv. SNOWTAM.
R24/19//95 R31/19//47 SNOWTAM decoding: Rwy 24, damp, for over 51 %, depth not measurable, braking action good; Rwy 31, damp, for over 51 %, depth not measurable, friction coefficient 0.47.
SNOWTAM (SNOW noTAM) is reported when necessary in some international destination. The format is as follows: RRTEDDBB where: RR = runway designator T = type of deposit E = extent of contamination DD = depth of deposit BB = braking conditions For RR (runway) the following code applies: 25 = runway designator (e.g. Rwy 25 or 25L, see below) 75 = runway designator for R runway- 50 is added to R Rwy designator (e.g. Rwy 25R) 88 = all runways 99 = a previous Rwy report is repeated NOTE: some airports are now using RRR/ designators (e.g. 25R/ or 16L/, see examples below) For T (type of deposit) the following code applies: 0 = Clear and Dry 1 = Damp 2 = Wet or Water Patches 3 = Rime or Frost < 1mm (< 0.04 in) 4 = Dry Snow 5 = Wet Snow 6 = Slush 7 = Ice 8 = Compacted or Rolled Snow 9 = Frozen Ruts or Ridges / = Not Reported (e.g. due to Rwy clearance in progress) For E (extent of contamination) the following code applies: 1 = 10% or less of RWY covered 2 = 11% to 25% of RWY covered 5 = 26% to 50% or RWY covered 9 = 51% to 100% of RWY covered / = Not Reported (e.g. due to RWY clearance in progress) For DD (depth of deposit) the following code applies: 00 = Less than 1 mm (< 0.04 in) 01 to 90 = Depth in mm (from 0.04 to 3.5 in) 92 = 100 mm (3.9 in) 93 = 150 mm (5.9 in) 94 = 200 mm (7.9 in) 95 = 250 mm (9.8 in) 96 = 300 mm (11.8 in) 97 = 350 mm (13.8 in) 98 = 400 mm (15.7 in) 99 = RWY not operational due to contamination or clearance in progress // = Depth not significant (e.g. ice) or not measurable (e.g. wet) For BB (braking conditions) the following code applies: 01 to 90 = Friction Coefficient (e.g. 34 = 0.34; see below for table) 91 = BA Poor 92 = BA Medium-Poor 93 = BA Medium 94 = BA Medium-Good 95 = BA Good 99 = BA Unreliable or not measurable (e.g. due to aquaplaning or rwy damp or dry) These special codes also apply: ////// = Report not updated CLRD = Contamination has disappeared (e.g. Rwy has been cleared) SNOCLO = Airport closed due to snow This table applies for friction coefficients (mu x 100): Code 91 means BA POOR mu coeff: 0-25 Code 92 means BA MEDIUM/POOR mu coeff: 26-29 Code 93 means BA MEDIUM mu coeff: 30-35 Code 94 means BA MEDIUM/GOOD mu coeff: 36-39 Code 95 means BA GOOD mu coeff: over 40
Jen zkusim doplnit: NOTAM = Notice to Airmen jsou zpravy duleziteho vyznamu rozsirovane s vyuzitim v historii dalnopisne AFTN (Aeronautical Fixed Telecommunication Network). Takto se take rozsiruji zpravy SNOWTAM, jejichz obsahem jsou informace o stavu letiste / VPD v zimnich podmnikach. Podrobneji treba zde: http://www.flyingineurope.be/snowtam_decode.htm
V METAR z puvodniho dotazu je ke konci skupina "Runway state message", ktera hovori pouze po stavu povrchu RWY a od zmeny kodu v roce 98 muze byt soucasti "aviation routine weather report" = METAR. Neni to cely SNOWTAM, ale jen cast, vsak v METAR velmi uzitecna, nebot se siri jako soucast zpravy a nemusi jit vse pres Notam Office.