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t GENERAL DISCUSSION This addendum is to expand on the earlier report submitted on November 10, 2004 showing that the Geneva Commons Building project will not adverealy effect the instrument pfOCedurss at SNA. it is to address some concerns that have been expressed about buildings in the location of th$ Geneva Commons project. Part 11 surfaces are advisory in nature and provide the requirements for submission of NotJcea of Proposed Construction or Alteretion, Form 7460.1. if the object exœeds a height or surface defined in Subpsrt C of FAR Part 77, it would be an obstruction and would of an aeronautical study by the FAA to determine its effect on navigable airspace. Is concluded to have a substantial edverse effect upon the safe and efficient utilization of such airspace, it would be determined to be a ha+ard to air navigation. for Terminal instrument surfaces are regulatory. adverealy I procedure if such object were a!lowed to be built depending on the amount of penetration and any mitigating factors. In the preaent cese, thera is neither any impact to any of the Instrument procedures at John Wayne Airport from the Geneva Commons building site nor does the building penetrate any of the regulatory TERPS obstacle clearance surfaces. In the Obstacle Analysis and Determination of No Hazard1 of the Geneva Commons site, the FAA determined that the building would not constitute a substential adverea effect Upon the safe and efficient utilization of such airspace. Our independent analysis concluded the same. As pslt of the FAAs aeronautical determination an analysis is mede as to any impsct to Instrument . The for this analysis is that the United Statea Standard rea urfaces is more reatrlctive than Part 77, and TERPS uld II, IlS ANALYSIS There appears to be some concern from the ALCU staff on potential irnpacts of the Geneva building on the ¡LS to Runway 19R at John Wayne Airport. As pointed out in the above discussion, and reedily viewable in diagrams A and 6, the proposed building site is located well outside the ¡LS TERPS surfacas. The proposed Geneva Commons building sits approximately 1300 feat outside the nearest edge of the ILS trapezoid. Prsclsion (11..8) Final Approach obstruction clearance surfaces are as depicted in Diagram 6. The "Y., "X" and 'W" obstacte clearance surface (OCS) dimensions are as specified in diagram 6. any additional formulae utilized but this page provides the basics, The 'W" OCS is an plane at SNA at iii 1:34 slops beginning 200' from the landing threshold point (I.. TP) and e)(Íeoding along the approach course centerline to the final approach fix. The "X" obstecle surfaoe begins at the height of the 'W" surfaca and rieas at a slopa of 1 :4 perp&ndicular to the final approach course. , 2003 - A1\\I!II>ol~-2~ 912312003 Page 44 of 61 2