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- airspace activities in the vicinity of airports;
- airspace activities affecting more than one FIR;
- outages of navigation aids affecting serving several airports and/or FIR;
- establishment of ATS airspace serving more than one airport;
- obstacles in the vicinity of several airports
- etc.
From a Digital NOTAM point of view, this requires that an Event can have several NOTAM associated, which is supported by the Event model.
The reason is primarily related to how NOTAM are currently selected for inclusion in Pre-flight Information Bulletins (PIB), based on the item A (airport code or FIR code). It has to be assured that the NOTAM appear correctly in the relevant en-route and airport PIB and that duplication in PIB (e.g. in the FIR) are avoided. Depending on the number of affected airports and FIR, NOTAM format limitations such as the limitation of Item A (maximum 7 FIR or 1 airport), NOTAM series allocation or other national requirements, different options exist to assure correct PIB inclusion. The NOTAM for the en-route and airport part of the PIB may also be combined, provided NOTAM rules are respected. This is often done to reduce the number of NOTAM issued.
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Rules for additional airport NOTAM
From a Digital NOTAM point of view, this requires that an Event can have several NOTAM associated, which is supported by the Event model.
Each "decoding" scenario that may be affected by this situation includes a section with the title "Several NOTAM possible", which provides specific rules for that scenario. Each scenario contains the detailed NOTAM generation rules for the “first NOTAM”. This section contains rules that are applied when issuing the additional airport (scope A) NOTAM:
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