Part-66 licences are required for:
- certifying the release to service of aircraft after maintenance,
- work in maintenance organisations as support staff.
Aircraft affected are those covered by the Basic Regulation. See the definition in Articles 1 and 4 of the Basic Regulation.
Release to service of piston-engine non-pressurised aircraft of 2000 Kg MTOM and below not involved in CAT do not need a Part-66 licence until 28 September 2014.
Release to service of ELA1 aeroplanes not involved in CAT do not need a Part-66 licence until 28 September 2015.
Release to service of sailplanes, balloons, and airships do not need a Part-66.
Other activities within maintenance organisations do not need Part-66 licences.