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- Visibility is 10 km or more
- No cloud below 1500m (5,000 ft) or below MSA (minimum sector altitude)
whichever is greater and no cumulonimbus (CB)
- No significant weather i.e no precipitation, thunderstorm, shallow fog or
low drifting snow
Note: Surface wind is not included
10.2 Supplementary Information
Some other information may also be included in reports, particularly with regard
to runway conditions:
- Standing water, e.g. damp, wet, water patches or flooded. Snow,
slush, ice.
- Braking action - given for Touchdown Zone, Mid-Point, Stop End.
(see table below)
- Other runway surface conditions (e.g. threshold displaced 1000ft
due to work in progress).
- Obstructions.
- Wind Shear warnings etc.
10.2.1 Braking Action Code
From data collected from operations on compacted snow and ice, an assessment
table has been produced to relate to a measured braking co-efficient to an
estimated braking action and hence to a simple code for braking action. It must
be borne in mind that the description “good” is a comparative value and is
intended to mean that aeroplanes should not experience directional control or
braking difficulties when landing, but conditions would not be as good as on a
clean, dry, runway.
The measured co-efficient may be reported as a 2 digit code without the decimal.
Measured Co- Estimated Code
efficient Braking Action
0.40 and above Good 5
GEN radio 2025 - Midtjysk Flyveskole 77
