Article 26 1.

Persons responsible for providing flight training, flight simulation training, or for assessing pilots' skills, as well as aero-medical examiners, shall be required to hold a certificate, except for situations in which, as a result of the adoption of implementing acts referred to in point (a) of Article 27(1), taking into account the objectives and principles set out in Articles 1 and 4, and in particular the nature and risk of the activity concerned, such certificates are not required.