AMC1 MET.TR.220(c) Aerodrome
forecasts
PERIOD OF VALIDITY
(a) The periods of validity for an up to
9-hour TAF should commence at 00, 03, 06, 09, 12, 15, 18 and 21 UTC and for a 24-
and a 30-hour TAF at 00, 06, 12 and 18 UTC or 03, 09, 15, and 21 UTC.
(b) The 24- and 30-hour TAF periods of
validity should be determined based on the types of operations, as agreed
between the aerodrome meteorological office and the operators concerned.
(c) A routine TAF valid for up to 9 hours should be issued every 3 hours, and those valid for 24 or 30 hours should be issued every 6 hours.
(d) If so agreed between the competent
authority and the meteorological services provider, TAF valid for 24 or 30
hours may be issued every 3 hours, and the validity should commence at 00, 03,
06, 09, 12, 15, 18 and 21 UTC.
(e) At aerodromes with limited hours
of operation, the beginning of the period of validity of a TAF should commence
at least 1 hour prior to the aerodrome resuming operations, or more as agreed
between the aerodrome meteorological office and the operators concerned, to
meet planning requirements for flights that arrive at the aerodromes as soon
as it is opened for use.
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