Exhaust Emissions from In-Use General Aviation Aircraft (2016) / Chapter Skim
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Pages 20-29
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20 Exhaust Emissions from In-Use General Aviation Aircraft In Table 3-2 confidence intervals are generally the best (smallest) for the Lycoming O-320 engine family because the 16 replicate tests contribute to good statistics of these inherently highly variable emissions burdens (4 partial tests were excluded)
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21 Sensitivity Analysis on Airport Emissions Sensitivity Analysis Using EDMS/AEDT Tools A hypothetical GA airport's emissions were calculated before and after inclusion of the newly measured emission indices. Differences of CO: -6%, HC: 194% and NOx: 64% were found.
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22 Exhaust Emissions from In-Use General Aviation Aircraft FAA's National Tail Number Registry was queried to construct a representative aircraft population. The data was further summarized and ranked by number of occurrence for each aircraft engine within each engine category.
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Sensitivity Analysis on Airport Emissions 23 were substituted when the engines from the Hypothetical Fleet were not present in the EDMS/ AEDT databases. In these cases, the research team used one of the following methods, based on data availability: • Simple substitution method, or • Advanced substitution method The simple substitution method was used when detailed data was not available.
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24 Exhaust Emissions from In-Use General Aviation Aircraft A second set of matches was constructed, substituting experimental data when available. Figure 4-2 outlines this procedure.
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Sensitivity Analysis on Airport Emissions 25 Step 3 -- Sensitivity Analysis Two emission scenarios were compared for the hypothetical airport: • A baseline scenario using pre-existing data and • An updated scenario including experimental data. The variability of the experimental data was used to define limits for the updated scenario; thus one is 95% confident that the hypothetical airport emissions fall between the upper and lower confidence limits.
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26 Exhaust Emissions from In-Use General Aviation Aircraft Figure 4-3. EDMS user-created aircraft modeling options.
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Sensitivity Analysis on Airport Emissions 27 Figure 4-4. AEDT user-defined aircraft modeling options.
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28 Exhaust Emissions from In-Use General Aviation Aircraft Updated Scenarios The updated scenarios examined consisted of (1) using averages of samples collected and (2)
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Sensitivity Analysis on Airport Emissions 29 When all aircraft results are averaged together, results comparing measured emission indices to the EDMS default values indicate that overall increases in emissions ranging from 10 to 288% are revealed for carbon dioxide (CO2) , total hydrocarbons (THC)
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