Extended range operations with two-engined aeroplanes (ETOPS)

(a) An operator shall not conduct operations beyond the threshold distance determined in accordance with the Maximum distance from an adequate aerodrome for two-engined aeroplanes without an ETOPS approval unless approved to do so by the Authority (ETOPS approval).

(b) Prior to conducting an ETOPS flight, an operator shall ensure that an Adequate ETOPS en-route alternate is available, within either the operator’s approved diversion time, or a diversion time based on the MEL generated serviceability status of the aeroplane, whichever is shorter. (See also Planning minima for an ETOPS en-route alternate aerodrome).

Source: EU-OPS