EASA AIR OPS
Regulation (EU) No 965/2012
CAT.OP.MPA.140 Maximum distance from an adequate aerodrome for two-engined aeroplanes without an ETOPS approval R

(a) Unless approved by the competent authority in accordance with Subpart F of Annex V (PartSPA), the operator shall not operate a two-engined aeroplane over a route that contains a point further from an adequate aerodrome, under standard conditions in still air, than the appropriate distance for the given type of aeroplane among the following:

(1) for performance class A aeroplanes with a maximum operational passenger seating configuration (MOPSC) of 20 or more, the distance flown in 60 minutes at the one-engineinoperative (OEI) cruising speed determined in accordance with point (b);
(2) for performance class A aeroplanes with an MOPSC of 19 or less, the distance flown in 120 minutes or, subject to approval by the competent authority, up to 180 minutes for turbojet aeroplanes, at the OEI cruising speed determined in accordance with point (b);
(3) for performance class B or C aeroplanes, whichever is less:

(i) the distance flown in 120 minutes at the OEI cruising speed determined in accordance with point (b);
(ii) 300 NM.