Precision approach systems such as ILS or MLS shall be identified by the system name (ILS, MLS, etc.). This is based on the PANS-OPS rules for conventional procedures identification (Volume II, Part I, Section 4, 9.5.1.2.1): “ The chart identification for procedures requiring ground-based navaids shall only contain the name describing the type of radio navigation aid providing the final approach lateral guidance. Although the definition does not say it explicitly, the intention is to identify the navigation equipment/system that is used for the final approach segment and that is normally part of the procedure identifier. The purpose and the intended use of this attribute needs to be clarified.
The list of values of the new attribute kept most of the values of the previous model version attribute that referred to a navaid system. In AIXM 5, this attribute was replaced by the approachType attribute, defined as “A name describing the type of radio navigational aid/system”. VOR/DME Approach, Instrument Landing System (ILS), NDB Approach, GPS Approach, etc.” The list of values was directly derived from the ARINC 424 Route Type for Airport Approach (PF) records and it includes values such as “N (NDB)”, “L (Localizer only )”, “E (RNAV, GPS Required)”, etc.
#LOCALIZER TYPE DIRECTIONAL AID CODE#
In the earlier AIXM versions (4.5), the IAP feature has an attribute called CODE_TYPE_RTE defined as “ a code indicating the type of Instrument Approach Procedure.
Some values (such as GALILEO, DME_DME, etc.) are removed, while other values (such as SRA, GLS, etc.) are added. The list of values for approachType attribute of the InstrumentApproachProcedure class is updated.
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