tribo ---
ICAO Annex 14 (Aerodromes), Attachment A gives an explanation on what "good" means:
> 6.6 The table below with associated descriptive terms was developed from friction data collected only in compacted snow and ice and should not therefor be taken to be absolute values applicable in all conditions. If the surface is affected by snow or ice and the braking action is reported as "good", pilots should not expect to find conditions asgood as on a clean dry runway (where the available friction may well be greater than that needed in any case). The value "good" is a comperative value and is intended to mean that aeroplanes should not experience directional control or braking difficulties, especially when landing.
>
>Measured coefficient / Estimated braking action / Code
0.40 and above -- Good -- 5
0.09 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
That doesn't really answer your question, but anyway....
