(1)a change to the
functional system or a change that affects the functional system shall be
carried out in accordance with point ATM/ANS.OR.A.045;
(2)a change to the provision of service, the
service provider's management system and/or safety management system, that
does not affect the functional system, shall be carried out in accordance with
point (b).
(b)Any change as referred to in point (a)(2)
shall require prior approval before implementation, unless such a change is
notified and managed in accordance with a procedure approved by the competent
authority as laid down in point ATM/ANS.AR.C.025(c).