Radio Mandatory in CTR

The Flight Restrictions model of AIXM can (theoretically) be used for coding the mandatory carriage of radio communication equipment in an existing Airspace, such as a 'CTR', avoiding the coding of a dedicated 'RMZ' Airspace for that purpose. In this case, the following elements are used:

• a FlightRestriction element with type equal-to 'FORBID', having a FlightConditionCombination with the logicalOperator equal-to 'ANDNOT' and with the following child elements:
  • an element.FlightConditionElement.flightCondition.FlightConditionElementChoice.airspaceCondition indicating the Airspace concerned. This FlightConditionElement must also indicate what type of relation exists between the flight an the airspace, using the operationalCondition.FlightConditionCircumstance.relationWithLocation with an assigned value equal-to 'XNG' (crossing), 'ARR' (arriving into) or 'DEP' (departing from) as appropriate. The typical value is 'XNG' (crossing the airspace), which covers both entering/exit and flights inside the airspace.
  • an element.FlightConditionElement.flightCondition.FlightConditionElementChoice.aircraft.AircraftCharacteristic with communicationEquipment equal-to 'OTHER:RADIO' (Note: the current list of values for AircraftCharacteristic.communicationEquipment does not have a general "radio equipment" value. It has specific values such as 'VHF', 'UHF', 'VHF_833', etc. );

Note: the presence of the Airspace concerned in the conditions branch of the FlightRestriction allows to also mark that Airspace as "reference location", using the operationalCondition.FlightConditionCircumstance.referenceLocation property. The purpose of the reference location is to enable an initial filtering of the flights that are verified for compliance with restrictions.

XML Coding Example