Originally Posted by EU-OPS
OPS 1.230
Instrument departure and approach procedures
(a) An operator shall ensure that instrument departure and approach procedures established by the State in which the aerodrome is located are used.
(b) Notwithstanding subparagraph (a) above, a commander may accept an ATC clearance to deviate from a published departure or arrival route, provided obstacle clearance criteria are observed and full account is taken of the operating conditions. The final approach must be flown visually or in accordance with the established instrument approach procedure.