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MP Apr 13, 2017 05:25 PM
The 2016 EMEP/EEA Guidebook, Aviation chapter (1.A.3.a), says in Section 3.4.1:
“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?
Replies (1)
EEA Apr 28, 2017 11:20 AM
Hi,

The meaning of the sentence in Section 4.8.2 was that it is necessary to maintain the fuel consumption and emission factors up-to-date in order to always reflect the emissions performance of aircraft in use today. For example, EASA has issued a new version of Emission indexes in April 2017. Therefore, any new engine in this file was not in the data provided by EUROCONTROL in 2016, and aircraft using these new engines (probably new variations of an existing aircraft or brand new models) were either probably not in the data provided in 2016 or provided with a proxy. Same for BADA performance data, when a new version of BADA is issued, we need to update our files in order to reflect the changes and replace proxy aircraft by the BADA models.

Emission indexes (EI) are not provided by EUROCONTROL but by EASA, FOCA and FOI. From these EIs we calculate fuel/emissions values for different distances taking into account the estimated most fuel efficient 4d profiles of aircraft flying these distances.

There is a detailed methodology document that comes with the Fuel and Emissions Inventory System developed by EUROCONTROL and currently under revision to reflect latest improvements. There is also a document describing how the spreadsheet in Annex 1 was created. If you would like to receive this document, please let us know and we will upload it to the Enquiry Forum.

Kind regards
 
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