En-Route Multi-Engine Aircraft – 1 Engine Inoperative

An aircraft operator shall ensure that:
• The gradient must be positive at least 1000ft above all terrain and obstructions along the route within (9.3km / 5NM ) on either side of the intended track and a positive gradient at 1500ft above an acceptable aerodrome.
or
• The net flight path must permit the aircraft to continue flight from cruising altitude to an acceptable aerodrome clearing vertically by at least 2000ft all terrain and obstructions along the route within (9.3km / 5NM ) on either side of the intended track in accordance with:
– engine failure at most critical point of the route;
– wind effect is taken;
– fuel jettison permitted;
– an acceptable aerodrome provided.

Source: EU-OPS