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In a runway report, what does "friction coefficient 0.20?" mean?

  • A

    Braking action good.

  • B

    Braking action medium.

  • C

    Braking action unreliable.

  • D

    Braking action poor.

ICAO Annex 14
Attachment A

6. Assessing the surface friction characteristics of snow-, slush-, ice- and frost-covered paved surfaces

Measured Coefficient

Estimated Surface Friction

Code
0.40 and above Good 5
0.39 to 0.36 Medium to good 4
0.35 to 0.30 Medium 3
0.29 to 0.26 Medium to poor 2
0.25 and below Poor 1

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