Mixed operations - Reference: Reg. (EU) No 965/2012 on air operations: ORO.DEC.100
Yes. SPO operations are not covered by the AOC certification process. Therefore, an AOC holder when conducting SPO missions will have to comply fully with Part-SPO and its associated procedures. This means that the AOC holder must submit a declaration, as well as apply for a high-risk authorisation, if it performs high-risk commercial SPO activities. The aircraft used for the SPO activities are listed on the declaration and in the operations manual.
However, you do not have to submit a declaration, if you operate NCO-SPO i.e. non-commercial specialised operations with other-than complex motor-powered aircraft.