The document specifies the method to be used to determine the mechanical durability of doorsets and the opening parts of windows after a defined number of operating cycles. It applies, whatever their construction materials and operating systems, to any window or any door in the form of complete assemblies in normal operating conditions. The parts concerned in the testing are the frame, the opening elements (including any secondary elements) and all essential hardware, including operating devices. It does not include any additional fasterners such as pegstays or cabin hooks, nor any independently installed restrictor.