| (1) | The meteorological service provider shall supply meteorological information to meteorological information users referred to in regulation 174.01. 1 in order to fulfil their respective mandates and develop air navigation systems. |
| (2) | The meteorological information referred to i n subregulation (1) shall be used— |
| (a) | during pre-flight planning by air service operator; |
| (b) | during in-flight re-planning by air service operator using centralised operational control of flight operations; |
| (c) | by flight crew members before departure; |
| (d) | by aircraft in flight; and |
| (e) | by ATSUs providing flexible routing options as an element of trajectory management. |
| (3) | Meteorological information supplied in accordance with subregulation (1) shall be understood by users to be— |
| (a) | the best approximation of the actual conditions at the time of observation; and |
| (b) | the most probable value which the meteorological element is likely to assume during the period of the forecast. |
| (4) | The time of occurrence or change of an element as given in a forecast shall be understood by users to be the most probable time when the phenomenon is likely to occur. |
[Regulation 174.01.4 substituted by regulation 8(d) of Notice No. 5008, GG50880, dated 28 June 2024 (Twenty-Ninth Amendment of the Civil Aviation Regulations, 2024)]
