О ТЕХНИКЕ БЕЗОПАСНОСТИ И ГИГИЕНЕ ТРУДА НА ПОРТОВЫХ РАБОТАХ. Конвенция. Международная организация труда. 06.06.79 152

Article 23

     1. In  addition to the requirements of Article 22,  every lifting
appliance  and  every  item  of  loose  gear  shall  be   periodically
thoroughly   examined  and  certified  by  a  competent  person.  Such
examinations shall take place at least once in every 12 months.
     2. For  the purpose of paragraph 4 of Article 22 and of paragraph
1 of this Article,  a thorough examination  means  a  detailed  visual
examination by a competent person,  supplemented if necessary by other
suitable means or measures in order to arrive at a reliable conclusion
as to the safety of the appliance or item of loose gear examined.