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What is the minimum percentage of a runway that must be covered with ice or snow for it to be classified as "contaminated"?

  • A

    50%

  • B

    25%

  • C

    10%

  • D

    75%

Refer to figures.
According to the European Union Aviation Safety Agency (EASA) Commission Regulation (EU) No 965/2012, ANNEX I - “Definitions for terms used in Annexes II to V”, “Contaminated runway” means a runway of which more than 25% of the runway surface area within the required length and width being used is covered by the following:

(a) surface water more than 3 mm (0.125 in) deep, or by slush, or loose snow, equivalent to more than 3 mm (0.125 in) of water;

(b) snow which has been compressed into a solid mass which resists further compression and will hold together or break into lumps if picked up (compacted snow); or

(c) ice, including wet ice;

Therefore, "25%" is the correct answer.

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