The article explains why the EASA requires hangar doors for MROs involved in Heavy Maintenance and what are the conditions that may exempt some MRO from meeting such a requirement.
The exact requirements to be accepted as Maintenance Manager in an EASA approved maintenance organisation are here explained in a detail that is not given in the main rule 145.A.30.
What are the reasons why the EASA requires the aircraft type training to be that one referred in the EASA Part 66? Why non-EU MRO are obliged to only authorise Support Staff and Certifying Staff holding an EASA Part 147 Certificate? Here there is my point of view.
EASA Part 147 Approved Maintenance Training Organisations (AMTO) are required to comply with the TNA (Training Needs Analysis) in order to determine the duration of the course they wish to offer. Read this post to learn what the TNA is and how it should be managed.
EASA Form 1s are used to release engines and components by organizations approved with the relevant engine and components ratings (e.g. B1 or C7). However a peculiar case allows A1 (Aircraft) rated organization to issue the EASA Form 1 for components removed as serviceable from EU Member State registered aircraft.