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10 3.1 Overview There are four worksheets denoted with orange-shaded tabs in the EIAT for the input and processing of airport activity data. ⢠Worksheet 3.1 is where the annual airport operations data source option is selected and the corresponding data are entered. These are the only data entry items for Chapter 3. ⢠Worksheet 3.2 estimates monthly and day-of-week temporal profiles. Worksheets 3.3 and 3.4 are charts of the resulting day-of-week and monthly temporal profiles, respectively. The temporal profiles are useful for inventory processing; however, these data do not impact the annual inventory estimates reported by the EIAT. 3.2 Annual Operations: Worksheet 3.1 The annual operations are the only facility-level input to the EIAT for which no pre-existing default exists; the user must supply the annual activity data. Two commonly available format options of annual data maintained by FAA are supported for input into the EIAT: the Terminal Area Forecast (TAF) and the Air Traffic Activity Data System (ATADS) standard report. There are two required actions for this worksheet: 1. Select the approach option for the format of the annual data and 2. Input annual airport operations data in the format of the selected option. There are no optional actions for this worksheet. Table 4 summarizes the inventory options for entering annual operations data; this table also appears in Worksheet 3.1. The user must select either the standard ATADS report (daily) or TAF-formatted data for entering the airport annual operations. Selection is completed with a pull-down menu. FAAâs ATADS database includes 515 facilities for calendar year 2013; TAF covers approxi- mately 3,400 facilities for 2013. For those facilities not covered by ATADS or TAF, the 2011 NEI documentation (U.S. EPA 2013b) should be consulted for alternative methods for estimating annual emissions, and those results can be readily adapted and entered into the EIAT through the TAF-formatted option in Worksheet 3.1. The ATADS is the preferred resource for annual airport operations because the data can be reported in daily format, which also supports the preparation of temporal profiles. The format of ATADS incorporated into the EIAT is daily reporting within the standard report covering an entire year. There are no restrictions on which calendar yearâs data may be entered. Date-specific C H A P T E R 3 Airport Activity Data
Airport Activity Data 11 operations should always begin in Row 9 and continue to Row 373 or Row 374 (depending on leap year). The ATADS airport operations standard report can be downloaded electronically at the Air- port Operations page of the ATADS website: http://aspm.faa.gov/opsnet/sys/Airport.asp. The format for the standard report directly used by the EIAT calls for the user to select the following reporting options: Range: <any annual period> Grouping: Date Facility: <user selected facility> Display: Standard Report Show Itinerant: Yes Show Local: Yes Format: Excel Filters: <no filters> Use of TAF data is the second preference for the entry of an airportâs annual operations. The TAF covers historic years as well as future-year forecasts. These data are available at FAAâs TAF website: http://aspm.faa.gov/apowtaf/. It should be noted that caution should be exercised when using future-year forecasts, and that reasonableness of future-year TAF data should be verified using information from other sources. Additional comments and remarks on the use of Worksheet 3.1 are as follows. 1. The operations data are reported for four aircraft operations classes individually (air carrier, air taxi, general aviation, military). For completeness, it is recommended that all four classes of aircraft be included even though the vast majority of piston-engine aircraft will fall under the air taxi and general aviation classes. Some military applications are powered by piston engines; it is not expected to find piston-engine aircraft classified as âair carrier.â 2. Columns AO to BI of Worksheet 3.1 contain the 2013 ATADS data for all 515 facilities report- ing in that year. These are used to estimate national average, default temporal profiles. These national data should not be modified in normal use of the EIAT. 3.3 Temporal Profiles: Worksheets 3.2, 3.3, and 3.4 There are three purposes for calculating and reviewing the temporal variation of the operations: 1. The NAAQS design value is the maximum rolling 3-month (i.e., calendar month) average over a 3-year period; it is necessary for air quality planning to know the variation in activity by month. 2. If an airport data collection plan is developed, it is important to capture a representative fleet and representative activity. In developing that plan, it is important to understand the tempo- ral variation in sources in order to ensure that the data collected are representative data. Inventory Option Title Description Facility Specific 1 Facility Data, Standard ATADS Report (Daily) User input of FAA ATADS standard airport report (daily operations) for any calendar year. Facility Specific 2 Facility Data, User-Supplied TAF Format Operations User-supplied total annual operations (FAAâs Terminal Area Forecast). Table 4. Inventory options for annual airport operations.
12 Best Practices Guidebook for Preparing Lead Emission Inventories from Piston-Powered Aircraft with the Emission Inventory Analysis Tool 3. Because temporal variation is observed to be regional and airport specific, the use of a default national average is less precise. Northern regions tend to have peak activity in the summer; southern regions tend to have peak activity in the winter. Some general aviation airports are busier on weekdays and some on weekends. Worksheet 3.2 calculates facility and national default temporal profiles from the daily ATADS data supplied in Worksheet 3.1. If airport-specific ATADS data are not supplied by the user, the facility temporal data are not computed. Worksheets 3.3 and 3.4 present the day-of-week and monthly profile charts, respectively. There are no user inputs to Worksheets 3.2, 3.3, and 3.4: the calculations are based on the activity data from Worksheet 3.1 and will represent the year of data supplied in that worksheet. There are no user actions needed (required or optional) to complete the temporal profile calculations. The national default temporal profiles for day-of-week and monthly activity variation, based on 2013 data, are presented in Tables 5 and 6, respectively. Examples of day-of-week and monthly profile charts from the EIAT are presented in Figures 1 and 2, respectively. Day Percentage of Weekly Operations General Aviation Air Taxi Sunday 11.8% 12.5% Monday 13.7% 14.6% Tuesday 14.5% 14.9% Wednesday 15.4% 15.3% Thursday 15.1% 15.5% Friday 15.4% 15.6% Saturday 14.1% 11.5% Table 5. Default national day-of-week temporal profile. Day Percentage of Monthly Operations General Aviation Air Taxi January 10.02% 9.65% February 9.05% 7.76% March 9.77% 8.92% April 10.15% 8.32% May 9.84% 8.56% June 7.62% 7.37% July 9.06% 8.97% August 8.21% 9.94% September 6.70% 8.70% October 7.79% 9.03% November 5.73% 6.50% December 6.06% 6.26% Table 6. Default national day-of-week temporal profile.
Airport Activity Data 13 0% 5% 10% 15% 20% 25% Sunday Monday Tuesday Wednesday Thursday Friday Saturday Pe rc en ta ge o f W ee kl y O pe ra tio n s Operations by Day of Week General Aviation (User-Supplied Facility, CY = 2013) Air Taxi (User-Supplied Facility, CY = 2013) Total Operations (User-Supplied Facility, CY = 2013) General Aviation (All ATADS Facilities, CY = 2013) Air Taxi (All ATADS Facilities, CY = 2013) Total Operations (All ATADS Facilities, CY = 2013) Figure 1. Example day-of-week temporal profile. 0% 2% 4% 6% 8% 10% 12% Pe rc en ta ge o f A n n u a l O pe ra tio n s Monthly Operations Distribution December January February March April May June July August September October November General Aviation (User-Supplied Facility, CY = 2013) Air Taxi (User-Supplied Facility, CY = 2013) Total Operations (User-Supplied Facility, CY = 2013) General Aviation (All ATADS Facilities, CY = 2013) Air Taxi (All ATADS Facilities, CY = 2013) Total Operations (All ATADS Facilities, CY = 2013) Figure 2. Example monthly temporal distribution.
