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Definition

The temporary closure usage limitation of aircraft stand(s). The closure can be total (any traffic is forbidden) or partial (with the exception of particular flights or aircraft categories).

Notes:

  • this scenario includes the closure usage limitation of one or more aircraft stands (could be all aircraft stands at the airport);this scenario also includes closure of an aircraft stand except for flight and/or aircraft categories;
  • more than one aircraft stand can be included only if the closure conditions (closure exceptions) applies limitations conditions apply equally to all. Otherwise, separate message (NOTAM) shall be issued;
  • this scenario does not cover the temporary addition of a supplementary restriction to the aircraft stand availability, such as "closed for aircraft heavier than...". 
  • this scenario does not cover the temporary change of the operational hours of an aircraft stand;this scenario does not cover the situation when the aircraft stand 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. Note that the flight and/or aircraft categories branch is optional, but can be more than once.

Image RemovedImage Added

Code Block
titleEBNF Code
collapsetrue
input = "airport designator" ["airport name"] "aircraft stand designator" {"aircraft stand designator"} \n
("conditional for" | "closed, except for" |  "prohibited for" | "allowed for")
("operation" ["closure reasonaircraft"] {["exceptflight"] ["PPR time" ["PPR details"]]) {"operation" [["aircraft"] ["flight"] {["otherPPR combinationtime" ["aircraft"]PPR [details"flight"]}]} \n
["reason"] "start time" "end time" [schedule] \n
{note}.

...

at closureAnother combination of aircraft/flight characteristics that are excepted from the closure/ConditionCombination.logicalOperatorwith its value set to "OR" closure AircraftStandTimeSlice closure AircraftStandTimeSlice closed closure closure according to the rules for encoding annotations

Data item

Description

AIXM mapping

airport designator

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

AirportHeliport.designator

airport name

The published name of the airport where the aircraft stand is located, used in order to identify the aircraft stand concerned.

AirportHeliport.name

aircraft stand designator

The designator of the aircraft stand to be closed.

AircraftStand.designator

closure reason

The reason for the aircraft stand closure.

AircraftStand/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 at the aircraft stand, not a reason for a closure.

PPR time

The value (minutes, hours, days) of the advanced permission request associated with the permitted operation.

AircraftStand/ApronAreaAvailability/..Usage.priorPermission with uom attribute

PPR details

Additional information concerning the prior permission requirement.

AircraftStand/ApronAreaAvailability/..Usage.annotation with propertyName="priorPermission" and purpose="REMARK"conditional forThe description of one or more operations, which is permitted under special conditions, usually a prior permission requirement

AircraftStand.availability.ApronAreaAvailability.operationalStatus with value 'LIMITED' and 

AircraftStand/..Availability/..Usage.type with value 'CONDITIONAL'

closed, except forAircraft stand is closed, except for operations explicitly identified in the input data.

AircraftStand.availability.ApronAreaAvailability.operationalStatus with value 'LIMITED' and 

AircraftStand/..Availability/..Usage.type with value 'RESERV'

prohibited forThe description of one or more operations that are prohibited for during the event duration.

AircraftStand.availability.ApronAreaAvailability.operationalStatus with value 'LIMITED' and 

AircraftStand/..Availability/..Usage.type with value 'FORBID'

additionally allowed for

The description of one or more additional operations that are available for a specific purpose during the event duration.

AircraftStand.availability.ApronAreaAvailability.operationalStatus with value 'OTHER:EXTENDED' and 

AircraftStand/..Availability/..Usage.type with value 'PERMIT'

operationThe specific type of operation concerned by the usage limitation update.AircraftStand/..Availability/..Usage.operation with the following list of values CodeOperationManoeuvringAreaType

aircraft

The description of one or more aircraft (such as "acft with wingspan less thanhelicopter") types that are exceptionally permitted at on the aircraft stand during its closureusage limitation.

AircraftStand/ApronAreaAvailability/..Usage/../AircraftCharacteristics. Note that only certain properties can be used in this scenario. See data validation coding rules for details.

flight

The description of one or more type of flight categories (such as "emergency") that are exceptionally permitted

on the aircraft stand during its

usage limitation.

AircraftStand/ApronAreaAvailability/..Usage/../FlightCharacteristics

other combination

PPR timeThe value (minutes, hours, days) of the prior permission request associated with a permitted operation.AircraftStand/ApronAreaAvailability/..Usage.priorPermission with uom attribute
PPR detailsAdditional information concerning the prior permission requirement.AircraftStand/ApronAreaAvailability/..Usage.annotation with propertyName="priorPermission" and purpose="REMARK"

reason

The reason for the aircraft stand usage limitation.

AircraftStand/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 limitation.

start time

The effective date & time when the aircraft stand

limitation starts. This might be further detailed in a "schedule".

AircraftStand/

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

end time

The end date & time when the aircraft stand

limitation ends.

AircraftStand/

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

schedule

A schedule might be provided, in case the aircraft stand's usage is effectively

limited according to a regular timetable, within the overall

limitation period.

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

note

A free text note that provides further details concerning the aircraft stand

limitation.

AircraftStand/ApronAreaAvailability.annotation

with purpose=”REMARK”

Assumptions for baseline data

...

  • AirportHeliport BASELINE as specified in the Basic Data for Airport/Heliport,
  • the information about the aircraft stand already exists in the form of a AircraftStand BASELINE TimeSlice, which contains as a minimum a designator and an associations with the AirportHeliport;
  • It is assumed that the following principles principle have been followed for the encoding of BASELINE AircraftStand.availability data (if available in the BASELINE data):
    • the operationalStatus has the value "NORMAL" (meaning that the facility operates with nominal parameters) for all AircraftStand.ApronAreaAvailability that are part of the BASELINE data;
    • operations that are explicitly permitted have been encoded as ApronAreaUsage with type=PERMIT or type=CONDITIONAL (in case a PPR is necessary);
    • operations that are explicitly forbidden have been encoded as ApronAreaUsage with type=FORBID;
    • if the airport is exclusively reserved for certain operations, then the ApronAreaAvailability that describes this condition contains only ApronAreaUsage elements with type=RESERV;
    • in case of conflictsthe usages of type FORBID take precedence over usages of type PERMIT or RESERVE;
    • the usages of type PERMIT take precedence over the usages of type RESERVE;

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.

One ApronAreaAvailability element having operationalStatus=CLOSED shall be included in each Apron TEMPDELTA. If the aircraft stand is "closed except for" flight and/or aircraft categories, all specified excepted operations shall be encoded as ApronAreaUsage child elements with:

  • either type=PERMIT, if there is no prior permission requirement;
    • or type=CONDITIONAL, if a prior permission requirement was specified. Note that this implies that a "closed" aircraft stand can still allow certain particular operations  a unique flight or aircraft are specified as being excepted, they one ConditionCombination with logicalOperator="NONE"Each pair of flight and aircraft conditions specified as being excepted one ConditionCombination with logicalOperator="AND" "other combination" branch is used, then a root ConditionCombinations element shall be encoded having logicalOperator="OR" and each pair of flight/aircraft included as a sub-condition (with logicalOperator="AND", see ER-04) 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 Air TEMPDELTA Timeslice. See the rules for Event Schedules.

    In accordance with the AIXM Temporality Concept, the ApronAreaAvailability elements included in the TEMPDELTA completely replace all the BASELINE ApronAreaAvailability information, during the TEMPDELTA time of applicability. Therefore, if the closure only concerns certain times, then the other times, when the aircraft stand eventually remains subject to the availability conditions of the Baseline data, shall be explicitly included in the TEMPDELTA. The calculation of the necessary additional ApronAreaAvailability elements to be included in the TEMPDELTA shall be automatically done by the applications implementing this specification.

    All ApronAreaAvailability 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 each taxiway element closure, enabling the operator to graphically check the availability at different times, such as in the example below:

    Image Removed

    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

    Identifier

    Data encoding rule

    ER-01

    The temporary closure of an aircraft stand shall be encoded as:

    • a new Event with a BASELINE TimeSlice (encoding=DIGITAL, scenario=STAND.CLSLIM, version=2.0), for which a PERMDELTA TimeSlice may also be provided; and
    • a TimeSlice of type TEMPDELTA for each affected AircraftStand feature, for which the "event:theEvent" property points to the Event instance created above;

    ER-02

    First, all the BASELINE availability.ApronAreaAvailability (with operationalStatus=NORMAL), if present, shall be copied in the TEMPDELTA.

    Then, an additional availability.ApronAreaAvailability element shall be included in the Apron TEMPDELTA having:

    • operationalStatus=LIMITED if the apron usage is "conditional for", "closed, except for", "prohibited for";
    • operationalStatus=OTHER:EXTENDED if the apron usage is "allowed for".

    Note: No mistyping - ApronAreaAvailability is the actual name of the object containing information about the operational status of an AircraftStand.

    ER-03

    If

    the aircraft stand usage is "conditional for" specified operations, flight and/or aircraft categories, then all specified limitations shall be encoded as

    ApronAreaUsage child elements with type=CONDITIONAL.

    ER-04

    If the aircraft stand is "closed, except for" specified operations, flight and/or aircraft categories, then all specified limitations shall be encoded as

    ApronAreaUsage child elements with type=RESERV.

    ER-05

    If the

    aircraft stand usage is "prohibited for" specified operations, flight and/or aircraft categories, all specified limitations shall be encoded as ApronAreaUsage child elements with type=FORBID.

    ER-06If the aircraft stand

    ER-07

    		usage is "allowed for" specified operations, flight and/or aircraft categories, all specified limitations shall be encoded as ApronAreaUsage child elements with type=PERMIT.
    ER-07

    If a unique flight or aircraft is specified as part of the condition, they shall be encoded as one ConditionCombination with logicalOperator="NONE".

    Otherwise, each pair of flight and aircraft shall be encoded as one ConditionCombination with logicalOperator="AND".

    ER-08

    If PPR time is specified, the uom attribute shall also be specified.

    Examples

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