“(a)

with regard to the emission monitoring plan:

(i)

a change of emission factor values laid down in the monitoring plan;

(ii)

a change between calculation methods as laid down in Annex 3, or a change from the use of a calculation method to the use of estimation methodology in accordance with Article 54(2) or vice versa;

(iii)

the introduction of new source streams;

(iv)

changes in the status of the aircraft operator as a small emitter within the meaning of Article 54(1) or with regard to one of the thresholds provided by Article 28a(6) of Directive 2003/87/EC5;”.