Landing - Wet and contaminated runways (EU-OPS 1.520)
(a) When the appropriate weather reports or forecasts, or a combination thereof, indicate that the runway at the estimated time of arrival may be wet (Definitions), the landing distance available shall be at least 115% of the required landing distance on dry runway as determined above.
(b) When the appropriate weather reports or forecasts, or a combination thereof, indicate that the runway at the estimated time of arrival may be contaminated (Definitions), the landing distance available shall be at least the landing distance determined in accordance with sub-paragraph (a) above, or at least 115% of the landing distance determined in accordance with approved contaminated landing distance data or equivalent, accepted by the Authority, whichever is greater.
(c) A landing distance on a wet runway shorter than that required by sub-paragraph (a) above, but not less than that required for landing on dry runway, may be used if the Aircraft Flight Manual includes specific additional information about landing distances on wet runways.
(d) A landing distance on a specially prepared contaminated runway shorter than that required by sub-paragraph (b) above, but not less than that required for landing on dry runway, may be used if the Aircraft Flight Manual includes specific additional information about landing distances on contaminated runways.
(e) When showing compliance with sub-paragraphs (b), (c) and (d) above, the criteria for landing on dry runway shall be applied accordingly except that the 60% margin shall not be applied to sub-paragraph (b) above.
Note: the governing para doesn't specify the landing technique but prescribes to account for detrimental factors. It's up to the operator to cater for it. The lawmaker doesn't care about the landing technique as long as the regulatory performance requirements are met. Obviously AUTO LAND requires longer distance than a manual one on contaminated RWY however if the LD available is sufficient, no reason not to do it. Very important aspect here is the fact that the approval is based on the contaminant type not the reported BA or FC.
AUTOLAND ALD on contaminated RWY is part of AFM and is approved by EASA.
