This topic contains only those PANS-AIM requirements relevant for a NDB. For general PANS-AIM requirements valid for all kind of Radio navigation aids see topic Navaid [NAV] and subordinated pages.
A Non-directional radio beacon (NDB) is a low or medium frequency radio beacon which transmits signals whereby the pilot of an aircraft properly equipped can determine bearings and 'home in' on the station.
A Locator is an LF/MF NDB used as an aid to final approach.
For a NDB, PANS-AIM requires some specific properties as part of the minimum AIP data set. These are
...magnetic variation, frequency...
The diagram below shows the AIXM classes, including the relevant data types, needed to encode that information The main class is the NDB which is a specialisation of the NavaidEquipment.
NDB Frequency
In AIXM 5 the frequency of the NDB emission is coded by using the NDB.frequency attribute.
The corresponding data type contains a uom attribute. For a VOR only the value equal-to 'KHZ' shall be used.
According ICAO Annex 10, Volume 1 the radio frequencies assigned to NDBs shall be selected from those available in that portion of the spectrum between 190 kHz and 1 750 kHz.
Magnetic Variation
For NDB PANS-AIM Appendx 1 requires the magnetic variation to be provided. For details about the encoding including rules see the topic Magnetic Variation.
Navaid Component
An NDB may be co-located with a MarkerBeacon. This will be coded as a Navaid with two correspondning NavaidEquipment instances, a VOR and a DME.
For both NavaidEquipment the NavaidComponent.collocationGroup will be equal-to '1'.
If the VOR is the navigable location of the navaid when the navaid is used as significant point:
the NavaidComponent.providesNavigableLocation for the VOR will be equal-to 'YES' and the NavaidComponent.providesNavigableLocation for the DME will be equal-to 'NO'.
The VOR provides the bearing information, whereas the DME is used for the distance information.
Coding Rules for NDB
TBD
Coding Examples
TBD