With the entry into force of Commission Regulation (EU) No 69/2014 on 18 February 2014, the concept of 'operational suitability data' (OSD) was implemented, integrating operational evaluation elements into the certification design process, as foreseen in the Basic Regulation (Regulation EU 2019/1138).
As per points 21.A.62, 21.A.108, and 21.A.120B of Annex I (Part 21), the holder of the type certificate (TC), restricted type certificate (RTC), supplemental type certificate (STC), or holder of the minor change approval shall make available at least one set of complete OSD and any changes to the OSD to all known EU operators of the aircraft, before the OSD must be used by a training organisation or an EU operator as well as, upon request, to:
- the competent authority responsible for verifying conformity with one or more elements of this set of OSD; and
- any person required to comply with one or more elements of this set of OSD.
Operators, training organisations or competent authorities who need to have access to the OSD MMEL for a TC or STC in order to carry out their activity are encouraged to liaise with the relevant (S)TC holders to ensure appropriate access to the OSD MMEL and revisions.
The European Union Aviation Safety Agency (EASA) is indeed not allowed to disclose OSD MMEL to third parties.
A non-exhaustive list of points of contact of (S)TC holders is reported below.
If you have any questions related to master minimum equipment list (MMEL) activities, please send an e-mail to: mmel [at] easa.europa.eu (mmel[at]easa[dot]europa[dot]eu)