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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.  The ILS Maneuver Integrity tool was developed to assist in this evaluation.


AeroNavData was tasked with developing the capability to produce procedure coding to 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 flight check aircraft to verify the integrity of ILS procedures within the required criteria.

The procedure design criteria consist of  the ability of these arcs to:

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

FAA’s Aeronautical Information Services AJV-5 team requested AeroNavData to create a software application to produce procedure packets based on ARINC 424 Standard Terminal Arrival Route (STAR) specifications.  These coded packets will 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 before a final design was agreed upon and approved by the FAA on April 6, 2010.   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 12 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.