FAQ n.21897

My project is re-classified, what implications are there?


Fees & charges category re-classification

Your project may be reclassified to a higher or lower category, e.g. from Simple to Standard, based on certain criteria that are defined in Commission Implementing Regulation (EU) 2019/2153. As a re-classification to a higher category leads to a higher fee, we will contact you first for your acceptance before taking any further action.

In case of re-classifications to a lower category, a credit note will be issued, if applicable.

For further information on the different fees & charges categories, please consult the tables sorted by application type provided in the Annex of the fees and charges regulation Commission Implementing Regulation (EU) 2019/2153


  Simple Standard Significant Complex Significant
EASA Supplemental Type Certificate (STC) STC, major design change, or repair, only involving current and well-proven justification methods, for which a complete set of data (description, compliance check-list and compliance documents) can be communicated at the time of application, and for which the applicant has demonstrated experience, and which can be assessed by the project certification manager alone, or with a limited involvement of a single discipline specialist All other STCs, major design changes or repairs ‘Significant’ is defined in point 21.A.101(b) of Annex I (Part 21) to Regulation (EU) No 748/2012 (and similarly in FAA 14CFR 21.101 (b)).

‘Complex Significant Change’ is any significant change (ref. GM 21.A.101 of Annex I (Part 21) to Regulation (EU) No 748/2012) involving at least two reasons justifying its classification as significant (examples of criteria as per this GM 21.A.101 of Annex I (Part 21) to Regulation (EU) No 748/2012: change in the general configuration, change to the principles of construction, assumptions used for certification have been invalidated)


any significant change involving two or more examples described as significant change (column ‘Description of change’ Tables in Appendix 2 to GM 21.A.101 of Annex I (Part 21) to Regulation (EU) No 748/2012).

If justified by exceptional technical circumstances, the Agency may reclassify a complex significant application to significant. 

EASA major design changes
EASA major repairs n/a n/a

Part 21 re-classification

Your application may be reclassified to a different application type, e.g. from Minor Change to Major Change based on certain technical criteria that are defined in Part 21. In this case a new application must be made to EASA.


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