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For Radio navigation aid, PANS-AIM requires some basic properties as part of the minimum AIP data set. These are

type. identification, name, aerodrome served, hours of operation, magnetic variation, frequency/channel, position, elevation, magnetic bearing, true bearing, zero bearing direction

The diagram below shows the AIXM classes, including the relevant data types, needed to encode that information:

Navaid Type

AIXM 5 defines the Navaid class as follows:

A service providing guidance information or position data for the efficient and safe operation of aircraft supported by one or more radio navigation aids.

In PANS-AIM this is actually the definition for "Radio navigation service".

However, in AIXM 5 a Navaid is composed of one or more NavaidEquipment.

The navaid.type attribute is used to code the type of the navaid (actually the service provided by one or more radio navigation aids).

Some examples:

A Navaid.type equal-to 'VOR' is composed of one NavaidEquipment which is a VOR.

A Navaid.type equal-to 'VOR_DME' is composed of two NavaidEquipment one which is the VOR and another one which is the DME.

A Navaid.type equal-to 'ILS' may be composed of  e.g. four NavaidEquipment, a Localizer, a Glidepath and two MarkerBeacon (one middle and one outer Marker).

Open question Navaid components

In case of navaidequipment used by another navaid, e.g. a marker used for an ILS, has the marker to be coded as Navaid as well?

Navaid Component

This information is not directly required by PANS-AIM. However, as this class is used to describe navaid collocations (e.g. VOR/DME) and the type of marker used for an ILS it shall be elaborated in the following.

In case the Navaid is composed of more than one NavaidEquipment the NavaidComponent class is used.

It indicates the navigation use of the NavaidEquipment as a component of the navigation service provided by a Navaid.

For example the DME NavaidEquipment is a NavaidComponent of an ILS system. The DME may be collocated with the Localizer and the DME may provide the navigable location for the Navaid service.

The NavaidComponent.collocationGroup attribute is used to describe the collocation of the NavaidEquipment.

All NavaidEquipment that have the same value for this property are collocated together.  For example for a collocated VOR/DME Navaid the VOR and DME navaid equipment will be assigned the same collocationGroup number equal-to '1'.  An ILS might have a Localizer with collocationGroup number equal-to '1' and collocated DME and Glidepath sharing collocationGroup number equal-to '2'.  

The NavaidComponent.markerPosition is a code indicating the position, in a navaid landing system, of the markers situated on the centreline of a runway. For example:  'OUTER', 'MIDDLE',' INNER', etc.

Finally the NavaidComponent.providesNavigableLocation attribute indicates if the navaid equipment used to specify the navigable location of the Navaid when the navaid is used as significant point. For example if you have a VOR/DME that is collocated but does not have the same geographical position, the VOR most likely will be the NavaidEquipment that provides the navigable location.

Navaid Purpose

This information is also not required by PANS-AIM to be provided. However, for the scope of a data set content and publication reasons it may be relevant to code that information.

The Navaid.purpose attribute is used to indicate the intended usage of the navaid i.e. 'ENROUTE' (E) or 'TERMINAL'  (A) or 'BOTH' (AE i.e. dual purpose).

In an AIP the purpose of a navaid is publishe in section GEN 2.5  List of Radio Navigation Aids.

In addition navaids published in ENR 4.1 Radio navigation aids — en-route will be used enroute per definition. On the other hand navaids published in AD 2.19/AD 3.18 Radio navigation and landing aids are per definition of terminal usage.

Navaid Designator & Name

A Navaid.designator is used to provide the coded identifier given to the navaid system.

It is limited to 4 characters, which may be upper case alpha and/or digit characters.

Depending on the specialised NavaidEquipment different concepts and rules for the navaid designator may be applied (see also specialised navaid equipment topics).

The Navaid.name is used for the long name given to the composite navaid.

Coding Rules for Basic Data for Navaid

TBD

Coding Examples

See topic Navaid [NAV]



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