“The updated fuel burnt and emissions values provided in the spreadsheet accompanying this chapter were calculated by using the EUROCONTROL Impact noise and emissions model to derive/generate the ‘more fuel efficient’ trajectory for each couple (aircraft airframe/engine(s)) selected for a selection of stage lengths within maximum observed stage length for this aircraft airframe, then by processing the trajectories obtained with the EUROCONTROL Advanced Emission Model (AEM) (version 2.5.3) in stand-alone mode, for calculating the fuel burnt and emissions values.”
However, in Section 4.8.2 it says:
"A key priority is to update the fuel consumption and emission factors in order to better reflect the emissions performance of aircraft in use today. The proposed EUROCONTROL fuel burn and emissions calculation tool (AEM) uses EUROCONTROL’s Base of Aircraft Data (BADA) for calculating fuel burnt and emissions above 3 000 ft (EUROCONTROL, 2016a and 2016b). This database contains altitude- and attitude-dependent performance and fuel burn data for more than 200 types of aircraft."
These seem contradictory. Are the EMEP/EEA factors derived from AEM or from some other source? Is there a detailed methodology describing the generation of these factors published anywhere?