某系列飞机机翼油箱输油系统故障分析

Failure Analysis of Oil Transmission System of Wing Fuel Tank of a Certain Series Aircraft

简要描述了某系列飞机机翼油箱输油系统的工作原理、故障现象和特点。分析了该故障的原因和影响因素。结果表明,机翼油箱增压管路结构设计存在缺陷,积聚在管路中的冷水不能排除干净,随着使用时间的增加,引起活门锈蚀,影响其正常工作。飞机在冬季寒冷潮湿的天气进行地面试车检查时,潮湿空气进入增压管路后形成的冷凝水聚集在活门内部,飞行时遇到气温突然下降,冷凝水结冰引起输油增压系统管路堵塞,增压空气无法打开活门向机翼油箱增压,导致系统不能正常输油。在查明故障原因和影响因素的基础上,提出了预防机翼油箱输油系统故障的措施。

The work principle, failure phenomenon, and the characteristics of the oil transmission system of the wing fuel tank of a certain series aircraft were described. The cause and influencing factors of the failure were analyzed. The results showed that there were design shortcomings on the increased pressure pipes structure of the wing fuel tank, thus, the condensation water deposited in pipes cannot-be removed completely, and leaded to the pipe vales be corroded and affected the vales normal working with the lapse of time. The moisture air got into pipes formed condensation water and deposited in vales after aircraft test run for inspection under grounding in moist ,winter. The condensation water froze leaded the pipes of the oil transmission system to be stop and the vales for in- creasing pressure to the wing fuel tank cannot be opened and cause the system cannot transmit oil normally when the temperature sud- denly drop during the aircraft flight. The preventive measure against the failure on the oil transmission system of the wing fuel tank were put forward on basis of the cause and influencing factors of the failure.