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| Info |
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| Warning |
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| How can to identify that a particular RadioCommunicationChannel is related to a particular, CallSignDetail (except using a Note), see example 
This should be coded as two separate SERVICE. Both provided by the TWR Unit. |
| Warning |
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| How to identify that a particular frequency of the service is for a certain feature, e.g. Route, Airspace of Holding? See CCB Issue. |
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For hours of service of the ATS Unit and its provided service see Schedules for Airspace.
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