RSG (Runway State Grop) – METAR

The RSG code in a METAR report provides information about the condition of the runway surface, which is crucial for pilots to assess before takeoff and landing.

The RSG code consists of various alphanumeric characters that describe factors such as the type of contaminants present on the runway (e.g., snow, ice, water, etc.) and the depth of any snow or slush. This information helps pilots determine the appropriate procedures and precautions to take during landing and takeoff, ensuring safe operations in various weather conditions.

Note – The RSG (Runway Surface Condition Group) code was indeed omitted from METAR reports following the introduction of the new SNOWTAM format in 2021. Instead of including RSG codes within METAR reports, information about runway surface conditions, including any contaminants such as snow, ice, or water, is now provided through SNOWTAMs (Snow Notice to Airmen). SNOWTAMs offer more detailed and standardized information about the condition of runways during winter weather, making it easier for pilots to assess runway suitability and take appropriate safety measures. However, this information is still included in some states (e.g. Azerbaijan and Russia).

RSG is 8-figure group which may be added to METAR for civil aerodromes. Following table will help you in decoding RSG code.

First Two Digits Third Digit Fourth Digit Fifth & Sixth Digits Seventh & Eight Digits
Indicates the runway

27: Rwy 27 or 27L

77: Rwy 27 (50 is added to designator for runway – 27+50)

88: All runways

99: Repetition of the last message as no new information received

Runway deposit

0: Clear and Dry

1: Damp

2: Wet or water patches

3: Rime or frost covered (depth normally less than 1mm)

4: Dry snow

5: Wet snow

6: Slush

7: Ice

8: Compacted or rolled snow

9: Frozen ruts or ridges

/: type of deposit not reported

Extent of runway contamination

1: 10% or less

2: 11% to 25%

5: 26% to 50%

9: 51% to 100%

/: not reported

Depth of Deposit

00: less than 1mm

01: 1 mm

02: 2 mm

and so on till 90

90: 90 mm

91: not used

92: 10 cm

93: 15 cm

94: 20 cm

95: 25 cm

96: 30 cm

97: 35 cm

98: 40 cm or more

99: Rwy not operational due to snow, slush, ice, large drifts or runway clearance, but depth not reported.

//: depth of deposit operationally not significant or measurable

They can indication Friction Coefficient or Braking Action

28: friction coefficient 0.28 (example)

37: friction coefficient 0.37 (example)

Or Braking Action Codes

91: Poor

92: Medium/Poor

93: Medium

94: Medium/Good

95: Good

99: Figures unreliable

//: Braking action not reported

If contamination conditions cease to exist, the abbreviation CLRD is used.

Example: 27CLRD93, Runway 27 cleared and braking action medium/good

Also Check: METAR and TAF Weather Reports Codes

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