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根据对民航10架波昔707飞机从1973～1980年累积飞行48200多小时的统计,液压系统发生故障达372次,平均每飞行不足130小时就发生一次故障。为此1982年波音公司派两名专家来华按波昔公司M09-9-010技术条件对液压油进行试验分析,决定将过去常用的防腐性能差的磷酸酯液压油Skydrol-500B改为新的防腐性能好的磷酸酯液压油Hyjet-Ⅳ。同时在机务维护、修理措施上严格要求:(1)将敞式注油改为使用专门的手搖泵
According to the statistics on 10 cumulative Bosha 707 aircraft flying over 48,200 hours from 1973 to 1980, 372 failures occurred in the hydraulic system, with an average failure of less than 130 hours per flight. To this end in 1982 Boeing sent two experts to China in accordance with the Puxi Company M09-9-010 technical conditions for hydraulic oil test analysis, decided to the past commonly used corrosion-resistant phosphate ester hydraulic oil Skydrol-500B changed to new Anti-corrosion performance of the phosphate ester hydraulic oil Hyjet-Ⅳ. At the same time in the maintenance of machinery, repair measures on the strict requirements: (1) to change the oil filling to use a dedicated hand pump