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In the example given above, this should be coded as two separated Service. Both provided by the same TWR Unit.
Hours of Service
For the coding of hours of service of the ATS Unit and its provided service see Schedules for Airspace.This information is required for ATS airspaces usually published in "ENR 2.1 FIR, UIR, TMA AND CTA":
3) call sign of aeronautical station serving the unit and language(s) used, specifying the area and conditions, when and where to be used, if applicable;
In AIXM, this information will be provided via the Service.availability. The ServiceOperationalStatus class and its properties are used to code the detailed information, including the operationalStatus and the timeInterval.
An operational status has to be coded, in order to support the AIXM Digital NOTAM Event concept
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The example below shows the Hours of service of the unit providing the service for the airspace.
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Coding Examples
The figure below shows an ATS Unit providing a Tower service within an airspace by using the DONLON CTR as example.
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