波音737飞机油箱盖板封严脱出的处理

HNAT737技术问题说明提示单编号撰写校对批准/旧期T1P737-2020-28-003符方洲赵斌曾品/2020.5.8标题油箱盖板封严脱出的处理一、适用性737NG,737MAX二、背景描述机队中偶尔有反应油箱盖板封严有脱出，无漏油的情况。针对此类情况，实际脱出的是金属封严，主要起防止潮气入侵的作用，不起密封作用，可以剪掉后放行。由于手册内缺乏明确文件支持，特补充厂家的相关说明。三、解释说明针对此类问题，和波音做了沟通，波音的正式答复如下：The protruding material appears to be the silicon edge of a fuel access door gasket.Boeingconfims that other operators have reported protruding gaskets in the past.The silicon edging actsas a moisture barrier keeping moisture out of the fuel tank and the fuel tank access panel nutdomes.This silicon strip does affect the operational characteristics of the mesh gasket.Animproperly seated gasket or one with the silicon removed could allow moisture access between theclamp ring,the wing skin,and the door.This moisture could cause cracks in the fuel access doornut domes.For this reason,Boeing does not recommend Hainan Airlines (HNA)to trim off theprotruding material of fuel access door gaskets.However,Boeing finds it acceptable,when gasketreplacement is not feasible,to clip back the protruding material and defer the gasket replacementprovided the following requirements are met:-There is no fuel leakEnsure to not pull additional material away from the gasketRetorque all fasteners common to the affected access panel per AMMReplace the gasket at the next available maintenance opportunity.简述为：此材料用于防止潮气进入油箱盖板NUT DOME,,不建议修剪此材料，但是可以暂不更换，只要满足以下条件：1/2