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According to the following SNOWTAM, what is the estimated braking action for ENAT and Runway 11?

ENAT/ALTA
SNOWTAM 0504
A) ENAT
B) 03280731
C) 11 F) 47/47/47 G) 8/8/8 H) 4/4/4 N) A B E/CLSD ALL REMAINING TWYS/47
R) APRON GA EAST/CLSD ALL REMAINING APRONS/47
T) CONTAMINATION/100/100/100/PERCENT

  • A
    Medium
  • B
    Medium/good
  • C
    Medium/poor
  • D
    Poor

Refer to figure.
A) Aerodrome identifier ⇒ ENAT
B) Date and time of observation ⇒ 03280731
C) Runway designator number ⇒ 11
D) Cleared length of runway in metres, if less than published length; further details in T)
E) Cleared width of runway in metres, if less than published width; additional L or R if offset from centreline
F) Type of deposit on every third of the runway ⇒ 47/47/47
G) Average depth in millimetres on every third of the runway ⇒ 8/8/8
H) Estimated surface friction on every third of the runway ⇒ 4/4/4
N) Taxiway conditions, codes as in F) ⇒ A B E/CLSD ALL REMAINING TWYS/47
R) apron conditions, codes as in F) ⇒ APRON GA EAST/CLSD ALL REMAINING APRONS/47
T) plain language additions of other significant ⇒ information CONTAMINATION/100/100/100/PERCENT

ICAO Document 9981 PANS -ADR

Assessment criteriaDowngrade assessment criteria
Runway condition codeRunway surface descriptionAeroplane deceleration or directional control observationPilot report of runway braking action
6
  • Dry
--
5
  • Frost
  • Wet (The runway surface is covered by any visible dampness or water up to and including 3 mm depth)

Up to and including 3 mm depth:

  • Slush
  • Dry snow
  • Wet snow
Braking deceleration is normal for the wheel braking effort applied AND directional control is normalGood
4

-15°C and lower outside air temperature:

  • Compacted snow
Braking deceleration OR directional control is between Good and MediumGood to Medium
3
  • Wet ('slippery wet' runway)
  • Dry snow or wet snow (any depth) on top of compacted snow

More than 3 mm depth:

  • Dry snow
  • Wet snow

Higher than -15°C outside air temperature:

  • Compacted snow
Braking deceleration is noticeably reduced for the wheel braking effort applied OR directional control is noticeably reducedMedium
2

More than 3 mm depth of water or slush:

  • Standing water
  • Slush
Braking deceleration OR directional control is between Medium and PoorMedium to Poor
1
  • Ice
Braking deceleration is significantly reduced for the wheel braking effort applied OR directional control is significantly reducedPoor
0
  • Wet ice
  • Water on top of compacted snow
  • Dry snow or wet snow on top of ice
Braking deceleration is minimal to non-existent for the wheel braking effort applied OR directional control is uncertainLess than Poor

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