Aircraft Engine Emissions

Piston Engines

Swiss FOCA has developed a measurement and calculation methodology for aircraft piston engine emissions in order to improve aviation emission inventories. Meaurement results and the emission datasheets of the most current aircraft piston engines are now openly available.

The summary report describes the emissions performance and a measurement and calculation methodology for aircraft piston engine emissions. Operational aspects and their effect on emissions are described as well. Additionally, some possibilities for emission reductions are highlighted. Appendices 1 to 5 contain the detailed information about measurements, the methodology, the measurement system and the tests. Data sheets for individual engines can be downloaded directly from the table (link below).

Helicopter Engines

Most of the individual helicopter engine emissions data are currently not publicly available. Additionally, to the knowledge of FOCA there is no detailed method for the determination of helicopter emissions available, as well. FOCA has therefore developed its own guidance on the determination of helicopter emissions, which helps the practitioner to estimate helicopter emissions in a more detailed way without having to use individual helicopter engine emissions data.

Turboprop Engines

Turboprop engines are jet engines which drive a propeller instead of a fan. The Swedisch Defence Research Agency (FOI ) is the keeper of a confidential database of emission factors with corresponding fuel flows for turboprop engines. Informations can be found at:

Jet and Turbofan Engines

Emissions certification values for jet and turbofan engines are provided in the ICAO Engine Emissions Databank, both as individual engine datasheets and also as a spreadsheet containing the data for all certified engines for which manufacturers have made data available. This Databank is publicly available at:

Further information