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Data item


AIXM mapping

airport designator

The published designator of the airport where the apron is located, used in combination with other elements in order to identify the apron portion concerned.


airport name

The published name of the airport where the apron is located, used in order to identify the apron(s) and/or apron portion(s) concerned.

apron name

The published name of the apron concerned. This information is used in combination with the airport designator/name in order to identify the affected  apron(s) and/or apron portion(s)

apron portion closed geometry

The coordinates defining the apron portion to be closed.


location and extent description

Textual description of the closed portion location and extent. 

ApronElement.annotation with propertyName="'extent" and ' and purpose="'DESCRIPTION"'
status=CLOSEDThe operational status of the apron element.ApronElement/ApronAreaAvailability.operationalStatus

closure reason

The reason for the apron portion closure.

ApronElement/ApronAreaAvailability.annotation with propertyName="'operationalStatus" ' and purpose="'REMARK"'. Note that the property "warning" of the ApronAreaAvailability class is not used here because it represents a reason for caution when allowed to operate on the apron, not a reason for a closure.

start time

The effective date & time when the apron closure starts. This might be further detailed in a "schedule".

ApronElement/ApronTimeSlice/TimePeriod.beginPosition, Event/EventTimeSlice.validTime/beginPosition and Event/EventTimeSlice.featureLifetime/beginPosition

end time

The end date & time when the apron closure ends.

ApronElement/ApronTimeSlice/TimePeriod.endPosition, Event Event/EventTimeSlice.validTime/endPosition and Event/EventTimeSlice.featureLifetime/endPosition also applying the rules for {{Events with estimated end time}}


A schedule might be provided, in case the apron portion is effectively closed according to a regular timetable, within the overall closure period.

ApronElement/ApronAreaAvailability/Timesheet/... according to the rules for {{Schedules}}


A free text note that provides further details concerning the apron closure.

ApronElement.annotation according to the rules for encoding annotations with purpose='REMARK'

Assumptions for baseline data

It is assumed that AirportHeliport BASELINE that AirportHeliport BASELINE Timeslice covering the entire duration of the event exist and have been coded as specified in the Coding Guidelines for the (ICAO) AIP Data Set. In addition the information about the Apron already exists in the form of a Apron BASELINE TimeSlice, which contains as a minimum:

  1. a nameand
  2. an association with the AirportHeliport;

Data encoding rules

The data encoding rules provided in this section shall be followed in order to ensure the harmonisation of the digital encodings provided by different sources. The compliance with some of these encoding rules can be checked with automatic data validation rules. When this is the case, the number of the encoding rule is mentioned in the data validation rule.


Data encoding rule


The temporary closure of an apron portion shall be encoded as:

  • a new Event with a 'BASELINE' TimeSlice (scenario='APE.CLS', version='2.0'), for which a PERMDELTA TimeSlice may also be provided; and
  • a TimeSlice of type 'BASELINE' for the ad-hoc ApronElement feature, for which the “event:theEvent”property event:theEvent” property points to the Event instance created above;.


ApronElement BASELINE TimeSlice shall have ApronAreaAvailability with operationalStatus='CLOSED'.

ER-03ApronElement BASELINE TimeSlice shall have associatedApron xlink associatedApron@xlink:href the Apron on which is located (as selected by the operator)
ER-04The location and extent description shall be encoded in free text as an ApronElement.annotation with propertyName="'extent" and ' and purpose="'DESCRIPTION"'
ER-05If the apron portion closure is limited to a discrete schedule within the overall time period between the "start time" and the "end time", then this shall be encoded using as many as necessary timeInterval/Timesheet properties for the ApronAreaAvailability of the affected ApronElement TEMPDELTA Timeslice(s). See the rules for Event Schedules. 
ER-06If there exists aircraft stands on the closed ApronElement and if the apron portion closure makes the aircraft stand unavailable, then a consequence STAND.CLS scenario shall also be encoded for the relevant AircraftStand feature and shall include a reference to the current event with role 'causeEvent'.

The system shall automatically identify the FIR where the AerodromeHeliport AirportHeliport is located. This shall be coded as corresponding concernedAirspace property in the Event

ER-08The AirportHeliport concerned by the closure shall also be coded as concernedAirportHeliport property in the Event.