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Definition

The notification that an aircraft ground service is temporary unserviceable at an airport. 

Notes:

  • this scenario shall be used to notify that an aircraft ground service is temporary unserviceable at an airport. 

  • this scenario does not cover the situation when the aircraft ground service is operating normally, but subject to a reason for caution.

Event data

The following diagram identifies the information items that are usually provided by a data originator for this kind of event. 

EBNF Code 
input = designator [name] \n 
"type of aircraft ground service" ["reason"] \n
"start time" "end time" ["schedule"] \n
{note}.

The following table provides more details about each information item contained in the diagram. It also provides the mapping of each information item within the AIXM 5.1.1 structure. The name of the variable (first column) is recommended for use as label of the data field in human-machine interfaces (HMI).

Data item

Description

AIXM mapping

designator

The published designator of the airport/heliport concerned. This information, in combination with eventually the name is used to identify the airport/heliport.

AirportHeliport.designator

name

The published name of the airport/heliport. This information, in combination with the designator is used to identify the airport/heliport.

AirportHeliport.name

type of aircraft ground service

The type of aircraft ground service which is temporary unserviceable.

AircraftGroundService.type with CodeAircraftGroundServiceType list of values.

reason

The reason for the aircraft ground service unserviceability.

AircraftGroundService.availability/ServiceOperationalStatus.annotation with propertyName="operationalStatus" and purpose="REMARK". 

start time

The effective date & time when the unserviceability of the aircraft ground service starts .

AircraftGroundService/TimePeriod.beginPosition, Event/EventTimeSlice.validTime/timePeriod.beginPosition and Event/EventTimeSlice.featureLifetime/beginPosition

end time

The effective date & time when the unserviceability of the aircraft ground service ends. 

Note: the end time can also be estimated. 

AircraftGroundService/TimePeriod.endPosition, Event/EventTimeSlice.validTime/timePeriod.endPosition and Event/EventTimeSlice.featureLifetime/endPosition

note

A free text note that provides further details concerning the unserviceability of the aircraft ground service.

AircraftGroundService.annotation with purpose=WARNING. The annotation is for the attention of a human users on the client side, which justify the use of purpose=WARNING

Note: In AIXM 5.1.1 - coding guidelines for AIP data set - interoperability rules - WARNING is reserved for notifications for operator. 

Assumptions for baseline data

It is assumed that information about the aerodrome already exists in the form of AirportHeliport BASELINE TimeSlice(s) covering the complete period of validity of the event, for which the baseline availability is coded as specified in the Coding Guidelines for the (ICAO) AIP Data Set.

It is assumed that information about the aircraft ground service at the aerodrome already exists in the form of AircraftGroundService BASELINE(s) TimeSlice covering the complete period of validity of the event, which contain as a minimum:

  1. aixm:type
  2. aixm:availability with ServiceOperationalStatus=NORMAL
  3. aixm:airportHeliport referencing the airport/heliport where the service is provided.

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. To the maximum possible extent, the compliance with these encoding rules shall be verified with automatic data validation rules.

Identifier

Data encoding rule

ER-01

The unserviceability of an aircraft ground service at an airport shall be encoded as:

  • a new Event with a BASELINE TimeSlice (encoding=”DIGITAL”, scenario=”ACG.UNS”, version=”2.0”), for which a PERMDELTA TimeSlice may also be provided; and

  • a TimeSlice of type TEMPDELTA for the affected AircraftGroundService feature(s), for which the "event:theEvent" property points to the Event instance created above.

ER-02

One ServiceOperationalStatus element having operationalStatus=UNSERVICEABLE shall be included in the AircraftGroundService TEMPDELTA.

ER-03If the end of the event is estimated, gml:endPosition shall have the attribute indeterminatePosition="unknown". 

ER-04

If the aircraft ground service 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 ServiceOperationalStatus of the AircraftGroundService TEMPDELTA Timeslice. See the rules for Event Schedules.

ER-05

In accordance with the AIXM Temporality Concept, the ServiceOperationalStatus elements included in the TEMPDELTA completely replace all the BASELINE ServiceOperationalStatus information, during the TEMPDELTA time of applicability. Therefore, if the unserviceability only concerns certain times, then the other times, when the arircraft ground service eventually remains subject to the availability conditions of the Baseline data, shall be explicitly included in the TEMPDELTA (associated with an ServiceOperationalStatus with status= ‘NORMAL’).

The calculation of the necessary additional ServiceOperationalStatus elements to be included in the TEMPDELTA shall be automatically done by the applications implementing this specification. All ServiceOperationalStatus 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. Not included in the NOTAM text generation". This is based on the current NOTAM practice which consists of including in the NOTAM only the changed information and not explicitly including the static data that remains valid during the NOTAM applicability.

It is recommended that the input interface provides a "calendar" view of the service unserviceability, enabling the operator to graphically check the availability at different times, 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.

ER-06The Event BASELINE shall have event:textNOTAM with attributes xsi:nil="true" and nilReason="inapplicable". 

Examples

Following coding examples can be found on GitHub (links attached):

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