lennud kahe turbiinmootoriga lennukitel, mille puhul lennuaeg ühe mittetöötava mootoriga reisilennukiirusel (standardatmosfääri tingimustes vaikse ilmaga) marsruudilt kuni sobiva varulennuväljani on s, any flight by an aeroplane with two turbine power-units where the flight time at the one power-unit inoperative cruise speed (in ISA and still air conditions), from a point on the route to an adequate, an airplane flight operation, other than an all-cargo operation in an airplane with more than two engines, during which a portion of the flight is conducted beyond a time threshold identified in part