Aircraft Flight Operation Regulations Article 234

An operator shall ensure that the single-engine aircraft operations on the routes or the areas, in the meteorological conditions expected for the flight, and in the event of engine failure, is capable of reaching a place at which a safe forced landing can be made. For landplanes, a place on land is required; for amphibian, a place on water or land is required.No operator may operate a single-engine aircraft to perform over-the-top operation, unless the latest weather reports or forecasts, or any combination of them, indicate that the weather along the planned route (including take-off and landing) allows flight under VFR under the ceiling and that the weather is forecast to remain so within 1 hour before the estimated time of arrival at the destination.