My operator provides us with figures for:
LANDING DISTANCE REQUIRED ON ICY / SLIPPERY RUNWAYS
The landing distances required for Icy/Slippery runway conditions are based on the same procedures and threshold speeds as in the normal landing case but using FULL reverse thrust on all engines, reduced braking coefficient and a 1.15 factor on the actual distance. The distances below are valid for use at airfield elevations up to 4000ft.
With a thrust reverser inoperative or a tailwind, landing on Icy/Slippery runways should be avoided as the landing distance required is likely to exceed the runway length available.
These figures also provide the guidance on the landing distances required when the Degraded Braking Action is ‘Medium/Poor’ or ‘Poor’
We can land, but cannot depart from a runway that is Icy / Slippery
During the recent poor weather our management issued us a notice to remind us that actual conditions are rarely as black & white as portrayed in the manuals!
The quality and and accuracy of braking action & contamination reports together with the variable nature of the grip / friction at different points on the runway require a cautious approach.
T'Bug