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.
...
- The recognised practice in many NOFs 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 general ICAO principle that single NOTAM shall address one subject and one condition only, however per OPADD exceptions may apply if the same subject/condition and timeframes apply. 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;
Event data
The following diagram identifies the information items that are usually provided by a data originator for this kind of event:
| Code Block | ||||
|---|---|---|---|---|
| ||||
input = "route availability" "route designator" "start point" "end point" {"upper limit" "lower limit"} {"direction"} {"route designator" "start point" "end point" {"upper limit" "lower limit"} {"direction"}} \n "start time" "end time" ["schedule"] {"note"}. |
...
Data item | Description | AIXM mapping | |||
|---|---|---|---|---|---|
route availability | An explicit indication that the route portion is closed. | RouteSegment/RouteAvailability.status with the list of values CodeRouteAvailabilityType | |||
route designator | The published designator of the route concerned. This information, in combination with the start/end point is used to identify the route segments concerned. | RouteSegment.routeFormed | |||
start point | The designator and eventually the type (in the case of a Navaid) of the significant point from where the route availability is affected. This information, in combination with the route designator and the end point is used to identify the route segments concerned. | RouteSegment.start/EnRouteSegmentPoint.pointChoice | |||
end point | The designator and eventually the type (in the case of a Navaid) of the significant point until where the route availability is affected. This information, in combination with the route designator and the start point is used to identify the route segments concerned. | RouteSegment.end/EnRouteSegmentPoint.pointChoice | |||
lower limit | The vertical level above which and including that level is affected by the closure. | RouteSegment/RouteAvailability/AirspaceLayer.lowerLimit and lowerLimitReference | |||
upper limit | The vertical level below which and including that level is affected by the closure. | RouteSegment/RouteAvailability/AirspaceLayer.upperLimit and upperLimitReference | direction | An indication of the direction in which the route segment is considered for closure. | RouteSegment/RouteAvailability.direction|
start time | The effective date & time when the closure starts. This might be further detailed in a "schedule". | RouteSegment/RouteSegmentTimeSlice/TimePeriod.beginPosition, Event/EventTimeSlice.validTime/timePosition and Event/EventTimeSlice.featureLifetime/beginPosition | |||
end time | The effective date & time when the closure ends. | RouteSegment/RouteSegmentTimeSlice/TimePeriod.endPosition and Event/EventTimeSlice.featureLifetime/endPosition also applying the rules for {{Events with estimated end time}} | |||
schedule | A schedule might be provided in case of the closure only being effective according to a regular timetable, within the period between the start time and the end time. | RouteSegment/RouteAvailability/Timesheet/… according to the rules for {{Schedules}} | |||
note | A free text note that provides further details concerning the route closure, such as reason, alternate routes, etc. | Route/RouteAvailability.annotation with purpose=”REMARK” |
...
- It is assumed that information about the route segments concerned already exists in the form of RouteSegment BASELINE TimeSlice(s) covering the complete period of validity of the event, coded as specified in the Coding Guidelines for the (ICAO) AIP Data Set - Route [RTE].
(Proposal for encoding rule - It is assumed that RouteAvailability information exists in the BASELINE data covering as a minimum the direction, status and associated AirspaceLayers. Furthermore, it is assumed that a clear indication of the status exists for' FORWARD' and 'BACKWARD' direction. The absence of one would make unclear its status) - It is assumed that all RouteSegment affected by the closure have a similar availability/RouteAvailability.status, e.g. 'OPEN', 'COND'.
...
Identifier | Data encoding rule | ||
|---|---|---|---|
ER-01 | The temporary closure of a route portion shall be encoded as:
| ||
ER-02 | The "route designator" shall be used in order to identify the route concerned, in order to instantiate the value of the RouteSegment.routeFormed property. If multiple routes exist with that designator, then the "start point" and "end point" information shall also be considered in order to identify the route concerned. | ||
ER-03 | A RouteAvailability object with status='CLSD', direction and at least one associated level.AirspaceLayer object shall be included in the TEMPDELTA TimeSlice for each RouteSegment concerned. | ||
ER-04 | If no lower limit is specified in the Event data input, then the associated level.AirspaceLayer should contain the values lowerLimit='FLOOR' (uom='OTHER'). | ||
ER-05 | If no upper limit is specified in the Event data input, then the associated level.AirspaceLayer should contain the values lowerLimit="CEILING' (uom='OTHER'). | ||
ER-06 | A maximum of two directions ('FORWARD' and 'BACKWARD') can be provided for each pair of upper and lower limit. | ER-07 | Note that in accordance with the AIXM Temporality Concept, the RouteAvailability associated with the TEMPDELTA completely replaces all the BASELINE RouteAvailability information, during the TEMPDELTA time of applicability. Therefore, if the temporary closure only concerns certain times, direction and/or levels, the other times, direction and/or levels, when the route eventually remains open/conditional, shall be explicitly included in the TEMPDELTA. The calculation of the necessary additional RouteAvailability elements to be included in the TEMPDELTA shall be automatically done by the applications implementing this specification. All RouteAvailability elements that are copied from the BASELINE data for completeness sake shall get an associated Note with purpose='REMARK' and the text="Baseline data copy." It is recommended that the input interface provides a "calendar/level" view of the route portion availability, enabling the operator to graphically check the status of the route availability at different times and levels, such as in the example below:
In the calendar view, the Baseline information that remains valid during the Event validity time shall be visibly identified from the information that is specific to the Event, for example by using a different colour fill pattern. |
...