Regulation
(EU) 2021/1338
A
meteorological watch office shall:
(a) issue AIRMET when the competent authority
has determined that the density of traffic operating below flight level 100,
or up to flight level 150 in mountainous areas, or higher, where necessary,
warrants the issue of AIRMET in combination with area forecasts for low-level
flights;
(b) cancel the AIRMET when the phenomena are
no longer occurring or are no longer expected to occur in the area;
(c) ensure that the period of validity of an
AIRMET is not more than 4 hours.
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