[Regulation 174.04.11 Heading substituted by regulation 8(n) of Notice No. 5008, GG50880, dated 28 June 2024 (Twenty-Ninth Amendment of the Civil Aviation Regulations, 2024)]
| (1) | An aircraft registered in the Republic, operating on international air route, and equipped with capable data-link, shall make routine aircraft observations— |
| (a) | during en-route and climb-out phases of a flight; and |
| (b) | during any phase of a flight. |
| (2) | Where air ground data link is used and ADS-C or SSR is being applied, routine aircraft observations shall where appropriate, be made every 15 minutes during an en-route phase and every 30 seconds during a climb-out phase for the first .10 minutes of a flight. |
| (3) | The Director shall, in accordance with regional air navigation agreement, designate, on a route with high-density traffic, an aircraft from among air service operators operating at each flight level, to make routine observations. |
| (4) | Flight crew members shall make special aircraft observations whenever the following conditions are encountered or observed: |
| (b) | moderate or severe turbulence; |
| (c) | moderate or severe icing; |
| (e) | thunderstorms that are obscured, embedded, widespread, or in squall lines; |
| (h) | pre-eruption volcanic activity or a volcanic eruption; and |
| (5) | An air service operator shall report aircraft observations during flight, at the time an observation is made, or as soon as is practicable. |
| (6) | An aircraft observation shall be reported as follows: |
| (a) | air-ground data link for routine observation; and |
| (b) | voice communication for special and non-routine aircraft observation made during a flight. |
| (7) | An ATSU shall relay special air reports received by voice communication to a local meteorological office or associated MWO. |
| (8) | An ATSU shall relay routine and special air-reports received by data link communication without delay to its associated MWO, AFS internet-based service centres, and world area forecast centres. |
| (9) | A meteorological office shall upon receipt of special air-reports from a local ATS unit, prepare and issue wind-shear warning and aerodrome warning in accordance with this Part. |
| (10) | An MWO shall upon receipt of special air-report from a local ATSU, issue AIRMET or SIGMET in accordance with this Part. |
| (11) | An air service operator shall record special aircraft observations of pre-eruption volcanic activity, a volcanic eruption. or volcanic ash cloud on a special air-report form and share a copy with a meteorological service provider. |
| (12) | A meteorological service provider shall include a copy of a completed special air-report in a flight documentation provided to a flight operating on routes which may be affected by volcanic ash clouds. |
| (13) | For helicopter operations to and from aerodromes on offshore structures. routine aircraft observations shall be made from helicopters at points and times agreed between the meteorological service provider and the helicopter operators concerned. |
| (14) | An aircraft not equipped with appropriate air-ground data link shall not be required to make routine aircraft observations. |
[Regulation 174.04.11 substituted by regulation 8(n) of Notice No. 5008, GG50880, dated 28 June 2024 (Twenty-Ninth Amendment of the Civil Aviation Regulations, 2024)]
