ATS.TR.135 Minimum cruising level for IFR flights

(a)Air traffic control units shall not assign cruising levels below the minimum flight altitudes established by the Member States, except when specifically authorised by the competent authority.

(b)Air traffic control units shall:

(1)determine the lowest usable flight level or levels for the whole or parts of the control area for which they are responsible;

(2)assign flight levels at or above such level or levels;

(3)pass the lowest usable flight level or levels on to pilots on request.