Report - DCE - Nationalt Center for Miljø og Energi

total emissions (in grams) from the so-called LTO (Landing and Take Off)
cycle divided by the rated engine thrust (kN). The ICAO LTO cycle contains
the idealised aircraft movements below 3000 ft (915 m) during approach,
landing, airport taxiing, take off and climb out.
For smoke all aircraft engines manufactured from 1 January 1983 have to
meet the emission limits agreed by ICAO. For NOx, CO, VOC The emission
legislation is relevant for aircraft engines with a rated engine thrust larger
than 26.7 kN. In the case of CO and VOC, the ICAO regulations apply for
engines manufactured from 1 January 1983.
For NOx, the emission regulations fall in four categories
a) For engines of a type or model for which the date of manufacture of the
first individual production model is on or before 31 December 1995, and
for which the production date of the individual engine is on or before 31
December 1999.
b) For engines of a type or model for which the date of manufacture of the
first individual production model is after 31 December 1995, or for individual
engines with a production date after 31 December 1999.
c) For engines of a type or model for which the date of manufacture of the
first individual production model is after 31 December 2003.
d) For engines of a type or model for which the date of manufacture of the
first individual production model is after 31 December 2007.
The regulations published by ICAO are given in the form of the total quantity
of pollutants (Dp) emitted in the LTO cycle divided by the maximum sea
level thrust (Foo) and plotted against engine pressure ratio at maximum sea
level thrust.
The limit values for NOx are given by the formulae in Table 3.35.