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The braking efficiency presents itself in the form of a…

  • A
    Numbers failling between 1 to 9.
  • B
    Percentage varying from 10% to 100%.
  • C
    Combination of the terms: poor, medium, good.
  • D
    Letter falling between A and E.

ICAO Annex 14

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

Note: The new EASA rule making effort is to remove coefficients and use only "good", "good-medium", etc. so must countries do not report coefficients anymore.

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