Definition
The temporary closure of one or more route portions (could be on different routes) due to a common cause, such as the activation of a temporary restricted area.
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- the current practice in many NOTAM Offices is to issue a single NOTAM containing all route segment closures for a given period of time, such as the next 24 hours. This practice does not strictly comply with the ICAO principle for NOTAM of one subject and one condition per NOTAM. From a Digital NOTAM point of view it is recommended to group in a single Event (and issue one single NOTAM) for all the route segments closures that have a common cause, such as the activation of a given restricted area. In a digital environment, this would facilitate the automatic generation and processing of the Events. This might increase the number of NOTAM messages, but the advantage would be the clarity of the information. For example, this would also enable calculating more precise centre/radius of influence for these NOTAM;
- this scenario does not include the permanent modification of the availability of a route; such events will be dealt with as a separate scenario;
- this scenario does not include the unidirectional closure of a route; such events will be dealt with as a separate scenario;
- the encoding of this event requires the use of the "eASMADR" extension in order to know the BASELINE CDR status of the route segment concerned.
This will probably need to be replaced with the ADR extension, which declares exactly the same elements, but in the ADR namespace. It is the follow-up of the eASM extension.
Event data
The following diagram identifies the information items that are usually provided by a data originator for this kind of event:
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