Regulation (EU) No 601/2012 is amended as follows:

(1) In Article 12(1), third subparagraph, point (a) is replaced by the following:

'(a) for installations, evidence for each major and minor source stream demonstrating compliance with the uncertainty thresholds foractivity data and calculation factors, where applicable, for the applied tiers as defined in Annexes II and IV, as well as for each emission source demonstrating compliance with the uncertainty thresholds for the applied tiers as defined in Annex VIII, where applicable;'

(2) In Article 15, paragraph 4, subparagraph (a) is replaced by the following:

'(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 III, or a change from the use of a calculation method to the use of estimation methodology in accordance with Article 55(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 55(1) or with regard to one of the thresholds provided by Article 28a(6) of Directive 2003/87/EC;'