10.3.1 Selection of Runway in Use
10.3.1.1 Use of other than nominated runways. Controllers must not nominate a particular runway for use if an alternative runway is available, when:
(a) for runway conditions that are completely dry:
(i) the cross-wind component, including gusts, exceeds 20 KT;
(ii) the downwind component, including gusts, exceeds 5 KT.
(b) for runway conditions that are not completely dry;
(i) the cross-wind component, including gusts, exceeds 20 KT;
(ii) there is a downwind component.