Draft EA - San Diego International Airport

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14 CFR Part 150 Update August 2009 San Diego International Airport Page 48 5.2.3 Aircraft noise and performance characteristics Specific noise and performance data must be entered for each aircraft type operating at the airport. Noise data is included in the form of sound exposure level (SEL – see Appendix B) at a range of distances (from 200 feet to 25,000 feet) from a particular aircraft with engines at a specific thrust level. Performance data includes thrust, speed and altitude profiles for takeoff and landing operations. The INM database contains standard noise and performance data for over one hundred different fixed wing aircraft types, most of which are civilian aircraft. The program automatically accesses the applicable noise and performance data for departure and approach operations by those aircraft. This study included many different aircraft types. While many aircraft could be modeled by direct assignments from the standard INM database, many were not in the INM database. For those aircraft types not in the INM standard database, FAA approved substitutions were used to model the aircraft with a similar type that was in the database, or a user-defined aircraft was created for that specific aircraft type. FAA approved substitutions came from the following three sources: ■ ■ ■ INM Version 7.0a includes the current list of standard FAA substitutions; SAN Part 150 specific request to the FAA for non-standard substitutions and user-defined aircraft (request and FAA approval documented in Appendices C, D, and E); INM 5.0 User’s Guide for pre-approved user defined aircraft, specifically three-engine business jets. 5.2.4 Runway utilization The SAN operations database contains a record of each flight detected by passive radar and collected and retained by ANOM. Each record in the database contains the date and time of flight and the runway used. From these records, overall runway usage tables for 2009 and 2014 were compiled by arrival or departure, day or night, and aircraft type. Table 8 presents the runway utilization rates that HMMH developed for this study. Table 8 Runway Utilization Source: ANOMS, HMMH Runway Use Runway Arrivals Departures Day Evening Night Day Evening Night Runway 09 1.36% 1.24% 4.73% .94% 1.13% 0.86% Runway 27 98.64% 98.76% 95.27% 99.06% 98.87% 99.14% Total 100% 100% 100% 100% 100% 100% 5.2.5 Flight track geometry As discussed earlier, RealContours provides increased precision in modeling INM flight tracks. RealContours uses individual flight tracks taken directly from radar systems rather than relying on consolidated, representative flight tracks data. This provides the advantage of modeling each aircraft operation on the specific runway it actually used and at the actual time of day of the arrival or departure. RealContours then sets up an INM study for each day using INM standard data. Each day is then modeled in the INM and the results for each day combined and averaged to get the annual contour. SAN DIEGO COUNTY REGIONAL AIRPORT AUTHORITY
14 CFR Part 150 Update August 2009 San Diego International Airport Page 49 Sample model tracks for Runway 9 and Runway 27 are provided in Figure 6 and Figure 7, respectively. The Runway 9 flight tracks were recorded on November 30, 2007 and the Runway 27 tracks on August 10, 2007. Due to the incompleteness of the helicopter flight tracks in the radar data, HMMH produced modeled flight tracks in the conventional INM method by using a sample of radar data from helicopters to determine predominant flight paths. The resulting modeled flight tracks for helicopters are shown in Figure 8. A total of 215,099 individual flight tracks were modeled for the 2009 and 2014 NEMs and 999 of these model tracks are presented in Figure 6 and Figure 7. No changes to the airfield or airspace are expected within the 5-year time frame for this project and therefore, no changes to the flight tracks resulted from the 2009 base year to the 2014 forecast year. The SAN approach angle for Runway 27 is 3.5 degrees. The standard INM7.0a aircraft approach profiles assume a 3.0-degree approach angle. To compensate for this difference, the FAA approved the use of an approach grid that applies a noise level correction for the difference in altitude based on the greater approach angle (Appendices C, D, and E). The approach grid was applied to the INM7.0a modeled contours to derive both NEMs. SAN DIEGO COUNTY REGIONAL AIRPORT AUTHORITY
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July 2013 DRAFT ENVIRONMENTAL ASSES
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Page 139 and 140: SAN DIEGO INTERNATIONAL AIRPORT - P
Page 141: Appendix A Agency Coordination
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Draft EA - San Diego International Airport

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