Best Practices Guidebook for Preparing Lead Emission Inventories from Piston-Powered Aircraft with the Emission Inventory Analysis Tool (2015) / Chapter Skim
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From page 23... ...
23 5.1 Overview Two worksheets denoted with blue-shaded tabs in the EIAT are used for selecting inventory options for defining operating modes and TIM assumptions. • Worksheet 5.1 is where the options for defining operating modes are selected by the user and parameter values corresponding to the approach option are set.
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From page 24... ...
24 Best Practices Guidebook for Preparing Lead Emission Inventories from Piston-Powered Aircraft with the Emission Inventory Analysis Tool under FAA/EPA default conditions. It is recommended that the run-up procedure be included in all inventory development, even when using FAA/EPA default operating mode assumptions.
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From page 25... ...
Operation Mode Data 25 For FW aircraft, the approach option selected in Table 14 then corresponds to setting the values for the following four parameters within the enhanced methodology: • Touch-and-go rate -- the fraction of facility operations that are touch-and-go; • Taxi-back rate -- the fraction of FW landings that then taxi-back and takeoff again without turning off the engine; • Run-up frequency (for a taxi-back takeoff) -- the fraction of occurrence of a taxi-back operation performing a run-up test prior to takeoff; and • Run-up frequency (for a standalone takeoff)
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From page 26... ...
26 Best Practices Guidebook for Preparing Lead Emission Inventories from Piston-Powered Aircraft with the Emission Inventory Analysis Tool of a standalone takeoff and a standalone landing significantly overestimates fuel consumption for both taxi-back and touch-and-go operations. Using the average statistics from ACRP 02-34, a FW aircraft that completes a standalone landing and takeoff (i.e., two operations)
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From page 27... ...
Operation Mode Data 27 In order to correctly collect and apply the TIM values to the inventory analysis, several key background elements need to be considered as relevant context. Five topics are covered in this remaining discussion: operating mode definitions, differences with the 1992 EPA guidance, ACRP 02-34 TIM data, maximum altitude assumptions, and other considerations for facilityspecific data collection.
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From page 28... ...
28 Best Practices Guidebook for Preparing Lead Emission Inventories from Piston-Powered Aircraft with the Emission Inventory Analysis Tool 5.3.2 Differences Between Guidebook Modes and EPA Guidance It should be noted that three of the operating mode definitions described above differ from the 1992 EI guidance, as follows: 1. There is a difference in the point at which the transition between takeoff and climb-out assumption is applied.
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From page 29... ...
Operation Mode Data 29 5.3.4 Maximum Altitude of Aloft Modes It is important to understand the different maximum altitude assumptions for the aloft modes of climb-out and approach that impact the TIM values for these modes. FAA/EPA defaults include the assumption of 3,000 feet AGL maximum altitude.
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