Operators will need to be familiar with the EASA Basic Regulation and the Air Operations Regulation. They will also need to comply with the detailed implementing rules in Annex VIII (Part-SPO). In addition, if conducting commercial specialised operations or engaged in non-commercial specialised operations using a complex motor-powered aircraft they will need to comply with Annex III (Part-ORO Organisation Requirements). If an operator needs specific approvals, for example, covering low visibility operations or dangerous goods; they will need to comply with elements of Annex V (Part-SPA).
Affected operators need to understand the rules and ensure they are in compliance.