10 / 20

Refer to figure.
The estimated surface friction for runway 09/27 is reported to be 5/5/3. What is the braking performance on the last third of the runway?

  • A

    Medium.

  • B

    Good.

  • C

    Medium to good.

  • D

    Medium to poor.

Refer to figure.
ICAO Annex 15
Appendix 2. Snowtam Format

9. Item H - Estimated surface friction on each third of the runway (single digit) in the order from the threshold having the lower runway designation number.

The values for each third of the runway are separated by an oblique stroke (/), without space between the values and the oblique stroke-, for example: 5/5/5.

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

For runway 09/27, at the last third of the runway the surface friction is reported as '3', so the friction is characterized as 'medium'.

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