313 - ATPL Question Bank in English - Under the current Air OPS contaminated-runway definition and its AMC, a significant portion means more than 25% of one runway third within the usable length and width. Which listed runway-surface substances are contamination descriptors? 1 - ordinary visible dampness or a reflective water film no deeper than 3 mm; 2 - standing water deeper than 3 mm, or dry/wet snow or slush; 3 - compacted snow; 4 - ice, including wet ice; 5 - moist grass as the normal runway surface.

Question 313 - Operational Procedures - ATPL - Airline Transport Pilot Licence