The answer for aircraft certification and equipment is in the ANO
Not so, the ANO has no validity in the Netherlands from where the question was posed. In any case, the question was "in EASA world[sic]", in which case the answer is the Air Ops Regulation; either Part-CAT for commercial air transport or Part-NCO/NCC for non-commercial ops. Although none of these is yet law in the UK, they are in some other member states.