The employer shall fill the Application for Periodic Inspection of Derrick cranes (Annex 10) one (1) month before the expiry of the qualification certificate for the inspection of derrick cranes and apply for periodic inspection at the inspecting organization; The cranes shall stop operation if the inspection is not applied for after the time limit or not passed.The aforesaid periodic inspection shall include the inspections for the structure, performance of parts of the crane and the load test as well as other necessary items.The load test as stipulated in the previous paragraph refers to carry out hoisting, vertical traveling, rotation and waving etc. with load equal to the rated load in the rated speed. However, it may be exempted if the inspecting organization deems it unnecessary.The load test stipulated in paragraph 2 shall apply to the stipulations in Article 35.