Aircraft Flight Operation Regulations Article 117

A long-range over-water flight indicates either one of the following conditions:1. Twin-engine airplane with alternate aerodromes planned, used over routes on which the airplane may be over water and away from land at more than a distance corresponding to 120 minutes at cruising speed for one power-unit inoperative or 400 NM; or2. An airplane having three or more power-units, with alternate aerodromes planned, used over routes on which the airplane may be over water and away from land at more than a distance corresponding to 120 minutes at cruising speed for two power-units inoperative or 400 NM; or3. All airplanes, other than the ones mentioned in the preceding two subparagraphs herein this article, used over routes on which the airplane may be over water and away from land at more than a distance corresponding to 30 minutes at normal cruising speed or 100 NM.When determining the distance away from land aforementioned in each subparagraph in the preceding paragraph of this article, the shorter one applies.