(1) |
A MWO established in terms of regulation 174.02.02(2) shall prepare and issue SIGMET information for specified hazardous en-route weather including volcanic ash and tropical cyclones within its area of responsibility. |
(a) |
base volcanic ash cloud and tropical cyclone SIGMET on advisory information received from VAACs and TCACS; |
(B) |
keep a period of validity of a SIGMET message for normal weather phenomenon too a maximum of four hours; |
(c) |
issue SIGMET for normal weather phenomenon not more than four (4) hours before commencement of a period of validity; |
(d) |
cancel a SIGMET when a phenomenon is no longer occurring or expected to occur; |
(e) |
issue SIGMET for volcanic ash and tropical cyclone as soon as practicable but not more than 12 hours before a commencement of a period of validity; |
(f) |
update SIGMET for volcanic ash and tropical cyclone every 6 hours; |
(g) |
ensure that the period of validity of volcanic ash cloud and tropical cyclone SIGMET is recorded for up to six (6) hours; and |
(h) |
request that information about volcanic ash be published in a NOTAM. |
(3) |
A MWO shall maintain close coordination with associated area control centre or flight information centre to ensure consistency of information published in a SIGMET and a NOTAM. |
[Regulation 174.04.7(3) substituted by regulation 8(m) of Notice No. 5008, GG50880, dated 28 June 2024 (Twenty-Ninth Amendment of the Civil Aviation Regulations, 2024)]
[Regulation 174.04.7 inserted by regulation 19 of Notice No. R. 520, GG 42632, dated 29 March 2019 (Twentieth Amendment of the Civil Aviation Regulations, 2019)]