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ILS Maneuver Integrity


Within the United States, airports are required to evaluate localizer criteria on a 10 NM Arc from the localizer antenna position, within 35 degrees each side of the centerline, and 18 NM from the localizer antenna position within 10 degrees either side of the centerline.  For non-US airports, the localizer must be evaluated on a 17 NM Arc and 25 NM Arc from the localizer antenna position within the same azimuth constraints.  AeroNavData’s ILS Maneuver Integrity application was developed to assist in this evaluation.


AeroNavData was contracted to develop an application t0 produce procedure coding that could be used to flight check selected Instrument Landing Systems (ILS), Localizer-Type Directional Aid (LDA), and Simplified Directional Facility (SDF) procedures worldwide.  This coding provides the profile for use in the aircraft tasked to flight check procedures.  This process enables the integrity verification of ILS procedures according to the required criteria.

The procedure design criteria include that the arcs:

  1. can be flown in both clockwise and counter clockwise directions
  2. can then fly to the localizer antenna location
  3. and from there, proceed outbound on the localizer centerline to a fix on the outermost arc

FAA’s Aeronautical Information Services AJV-5 team contracted AeroNavData to create a software application to produce procedure packets based on ARINC 424 Standard Terminal Arrival Route (STAR) specifications.  These coded packets are to be added to the FAA Aviation System Standards (AVN) custom database and packed for loading into aircraft onboard Flight Management Systems (FMS).


AeroNavData analysts, developers, and software engineers researched various concepts and finalized the optimal design that was approved by the FAA.   Through a rigorous design process and multiple iterations, AeroNavData created the “ILS-1 Maneuver Tool Design” that precisely achieved the desired results.


The ILS-1 Maneuver Tool design satisfied all of the FAA team’s specific requirements.  Paramount among them were:

  • a design based on ARINC 424 Standard Terminal Arrival Area (STAR);
  • Constant Radius Turn Path Terminal (RF) flight profile
    • to best portray fix locations and bearings
    • lending a higher degree of positional awareness to the flight check crew;
  • Flexibility to evaluate  ILS installations based on either US or PANS-OPS requirements.