Report - DCE - Nationalt Center for Miljø og Energi

(EMEP/EEA, 2009) for air traffic, off-road working machinery and equipment,
and ferries, while for the remaining sectors the simple method is used.
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The activity data for air traffic consists of air traffic statistics provided by the
Danish Civil Aviation Agency (CAA-DK) and Copenhagen Airport. Fuel statistics
for jet fuel consumption and aviation gasoline are obtained from the
Danish energy statistics (DEA, 2011).
For 2001 onwards, pr flight records are provided by CAA-DK as data codes
for aircraft type, and origin and destination airports (city-pairs).
Subsequently the aircraft types are separated by DCE into larger aircraft using
jet fuel (jet engines, turbo props, helicopters) and small aircraft types
with piston engines using aviation gasoline. This is done by using different
aircraft dictionaries, internet look-ups and by communication with the CAA-
DK. Each of the larger aircraft type is then matched with a representative
type for which fuel consumption and emission data are available from the
EMEP/EEA databank. Relevant for this selection is aircraft maximum take
off mass, engine types, and number of engines. A more thorough explanation
is given in Winther (2001a, b).
In the later years many flights in Denmark are being made by the new aircraft
types CRJ9, E70, E170 and E175. These aircraft types are not represented
by data in the EMEP/EEA databank. Instead new fuel consumption
and emission factors have been calculated using fuel consumption and emission
indexes from the ICAO Engine Exhaust Emission Database
(www.caa.co.uk) for the CFM34-8C5 engine type which is installed in CRJ9,
E70, E170 and E175. For LTO the fuel consumption and emission indexes are
directly available from the ICAO database. For cruise, distance related indexes
are calculated by weighting the baseline CFM34-8C5 indexes with the
development in distance related emission indexes for the B737 400 representative
aircraft type taken from the EMEP/EEA database.
The ideal flying distance (great circle distance) between the city-pairs is calculated
by DCE in a separate database. The calculation algorithm uses a
global latitude/altitude coordinate table for airports. In cases when airport
coordinates are not present in the DCE database, these are looked up on the
internet and entered into the database accordingly.
For inventory years prior to 2001, detailed LTO/aircraft type statistics are
obtained from Copenhagen Airport (for this airport only), while information
of total take-off numbers for other Danish airports is provided by CAA-DK.
The assignment of representative aircraft types for Copenhagen Airport is
done as described above. For the remaining Danish airports representative
aircraft types are not directly assigned. Instead appropriate average assumptions
are made relating to the fuel consumption and emission data part.