Chapter 11. Evaluating Aeronautical Effect

11-5-1. ELECTROMAGNETIC OR LINE-OF-SIGHT INTERFERENCE

The technical operations services office must study airport proposals to determine if there is a possibility of ­electromagnetic or line-of-sight interference. Use the guidance in paragraph 6-3-3 to determine the extent ­of any adverse effect. At locations with an ATCT, a shadow study is required to determine if part of the aircraft ­operating area would be shielded from view by the control tower. In either case, when a potential problem exists, ­request the Airports Office to negotiate a resolution with the sponsor. If this is not possible, then proceed with ­the study and submit findings to the Airports Office.

11-5-2. EVALUATION OF INSTRUMENT RUNWAY DESIGNATION

The designation of an instrument landing runway may be associated with a precision type landing aid. Conduct ­a study of a proposal to designate an instrument landing runway to determine the feasibility of siting various ­components in accordance with established siting criteria. Forward comments and recommendations to Airports. ­Should program approval be received for the installation of an instrument landing system to serve a runway ­which has not been designated as an instrument landing runway, send a letter to the Airports Office requesting ­a study for the runway to be so designated. Include data in the letter concerning the siting of the various ­components, their heights, and any other comments that may be appropriate.

11-5-3. CHANGE IN AIRPORT STATUS FROM VFR TO IFR

The technical operations services office must review all proposed airport status changes to ensure that there is ­no effect on its functional responsibilities. Forward the study results to the FPT or Airports Division Offices, ­as appropriate.

11-5-4. AIRPORT PROPOSALS

Proposals vary in complexity from a single runway airport to a major air carrier airport. When NAVAID, ­communication, or radar/surveillance facilities are part of the ALP, the technical operations services office must ­conduct a study to evaluate the feasibility of siting and installing the proposed facilities as well as to evaluate ­the effect of the proposal on existing NAVAIDs. Conduct a shadow study, based on necessary data provided by ­the airport owner to ensure that existing or proposed structures, or natural objects, do not derogate the airport ­traffic control tower line-of-sight visibility of the proposed runway or taxiway. Forward the results of the study ­to the Airports Office.