Text NOTAM production rules

This section provides rules for the automated production of the text NOTAM message items, based on the AIXM 5.1.1 data encoding of the Event. Therefore, AIXM specific terms are used, such as names of features and properties, types of TimeSlices, etc:

  • the abbreviation RDN.BL. indicates that the corresponding data item must be taken from the RunwayDirection BASELINE;

  • the abbreviation AHP.BL. indicates that the corresponding data item must be taken from the AirportHeliport BASELINE associated with the Runway that is associated with the RunwayDirection concerned;

  • the abbreviation RWY.BL. indicates that the corresponding data item must be taken from the Runway BASELINE associated with the RunwayDirection concerned;

  • the abbreviation RDN.TD. indicates that the corresponding data item must be taken from the RunwayDirection TEMPDELTA that was created for the Event.

    • Notes:

      1. According to encoding rule ER-01, each RunwayDirection of the Runway concerned by the closure will have a TEMPDELTA encoded. However, the closure information will be identical for all runway directions. Therefore, if not specified otherwise, the RDN.TD referred in the NOTAM production rules below shall be the one of the RunwayDirection with the lowest designator number;

      2. According to encoding rule ER-02, the TEMPDELTA might also include ManoeuvringAreaAvailability elements that have been copied from the BASELINE data for compliance with the AIXM Temporality rules. The current practice is to not include such static information in the NOTAM text. Therefore, all ManoeuvringAreaAvailability that have operationalStatus=NORMAL will be ignored for the NOTAM generation.

Item A

The item A shall be generated according to the general production rules for item A using the Event.concernedAirportHeliport,

Item Q

Apply the common NOTAM production rules for item Q, complemented by the following specific rules for this particular scenario:

Q code

The following mapping shall be used:

RWY.BL.typeCorresponding Q codes
RWYQMRLC
FATOQFHLC


Scope

Insert the value ‘A’.

Lower limit / Upper limit

Use “000/999”

Geographical reference

Insert the coordinate of the ARP (aerodrome reference point) of the airport (AHP.BL.ARP.ElevatedPoint), formatted as follows:

  • the set of coordinates comprises 11 characters rounded up or down to the nearest minute; i.e. Latitude (N/S) in 5 characters; Longitude (E/W) in 6 characters;

  • the radius value is “005”.

Items B, C and D

Items B and C shall be decoded following the common production rules.

If at least one RDN.TD.availability.ManouevringAreaAvailability.timeInterval exists (i.e. the Event has an associated schedule), then all such Timesheet(s) shall be represented in item D according to the common NOTAM production rules for {{Item D, E - Schedules}}. Otherwise, item D shall be left empty.

Item E

The following pattern should be used for automatically generating the E field text from the AIXM data:

EBNF Code
template = ["(1)" "AHP.BL.type(2)" ("AHP.BL.name(3a)" | "AHP.BL.ARP(3b)")  ]  "\n" \n
["unpaved(4)"] "RWY.BL.type(5)" "RDN.BL.designator(6)" "closed" ["due to" "RDN.TD.availability.annotation(7)"]\n
{"\n" "TD.availability.annotation(8)" "."} ["."].


Reference

Rule

(1)

If AHP.BL.locationIndicatorICAO is not null, then ignore this branch.

(2)

Insert here the type of the airport decoded as follows

AHP.BL.type

Text to be inserted in Item E

AD or AH

"AD"

HP

"Heliport"

LS or OTHER

"Landing site"

(3)

  1. If AHP.BL.name is not NIL, then insert it here. Otherwise:

  2. insert here the text "located at" followed by the AHP.BL.ARP.ElevatedPoint decoded according to the text NOTAM production rules for aixm:Point

(4)

Insert the word “unpaved” if RWY.BL.SurfaceCharacteristics.composition has one of the values CLAY, CORAL, EARTH, GRASS, GRAVEL, ICE, LATERITE, MACADAM, SAND, SNOW, WATER, OTHER. Otherwise do not insert anything.

(5)

Insert here the type of the Runway decoded as follows

RWY.BL.type

Text to be inserted in Item E

RWY

"RWY"

FATO

"FATO"

(6)

If more than one RunwayDirection has a TEMPDELTA associated with the Event, then insert the designator of each additional RunwayDirection, preceded by "/", starting with the one with the lower designator number. In general, a runway has two landing directions but there may exist very rare situations with 3-4 landing directions.

(7)

If there exists a RDN.TD.availability.annotation having propertyName="operationalStatus" and purpose="REMARK", then translate it into free text according to the decoding rules for annotations.

(8)

Annotations of RDN.TD.ManoeuvringAreaAvailability shall be translated into free text according to the decoding rules for annotations.

Note: The objective is to full automatic generation, without human intervention. However, the implementers of the specification might consider reducing the cost of a fully automated generation by allowing the operator to fine-tune the text in order to improve its readability (with the inherent risk for human error, when re-typing is allowed).

Items F & G

Leave empty.

Event Update

The eventual update of this type of event shall be encoded following the general rules for [archived] Event update or cancellation, which provide instructions for all NOTAM fields, except for item E and the condition part of the Q code, in the case of a NOTAM C

If a NOTAM C is produced, then the 4th and 5th letters (the "condition") of the Q code shall be "AK", except for the situation of a “New NOTAM to follow" in which case “XX”shall be used.

The following pattern should be used for automatically generating the E field text from the AIXM data:

EBNF Code
template_cancel = ["(1)" "AHP.BL.type (2)" ("AHP.BL.name (3a)" | "AHP.BL.ARP (3b)")  ] ["unpaved(4)"] "RWY.BL.type(5)" "RDN.BL.designator(6)" ("resumed normal operations." | " : New NOTAM to follow.(9)").

Reference

Rule

(9)

If the NOTAM will be followed by a new NOTAM concerning the same situation, then the operator shall have the possibility to choose the "New NOTAM to follow" branch.  This branch cannot be selected automatically because this information is only known by the operator.

Note: in this case, the 4th and 5th letters of the Q code shall also be changed into “XX”. 

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