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.