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SR 3-5396507207

2022年8月，机队运行中连续两架飞机反应在尾撬余水口发现螺钉。

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打开狗洞和尾撬的盖板，并未发现丢失，且该规范号并为在该区域找到适用。

波音表示非常少用到，可能与结构修理相关。

The screw found in B-17X5 looks similar to BACS12CK type screw.  This screw has few installations in section 48.  Boeing notes that BACS12CK screws are installed at the STA 1016 cable seal installation.  See AIPC 27-41-00-11.

The bolt found on B-57X5 looks to be a typical structural permanent fastener, but the head marking does not reveal any possible source.

Boeing appreciates HNA completed inspection of tail skid zone and tail compartment.  Boeing recommends reviewing recent maintenance or repairs in section 48 that would include part and fastener removals.  Boeing recommends another inspection verification of systems installations for missing screws and structure installations, including brackets, for missing permanent fasteners.

SR 3-5390070991

前登机门S199 88mils（标准80-120mils）→278mils→TGT FAR
后登机门S200 87mils（标准80-120mils）→276mils→TGT FAR
前勤务门S194 148mils（标准90-180mils）→295mils→TGT FAR
后勤务门S195 97mils（标准80-120mils）→249mils→TGT FAR

波音认为NEAR不会导致门警告灯亮。

Target NEAR indication will not trigger the passenger entry door light to illuminate. However, per FIM 52-10 Task 801, any anomalies with the Aft Entry Door sensor itself, the Forward Entry Door Switch (S1147), the Entry or Galley Interior Door handle being out of position, the Service Door out of adjustment, the Wiring, and the PSEU itself, will result in a door indication.

而设置最小的MILS值目的是防止在出现震动等条件下时，避免发生干涉。

SR 3-5390993950

2022年8月，14*2飞机出现航前检查发现氧气压力降为0的情况，经检查发现第二观察员氧气面罩存放盒后部供气管渗漏，检查管路破损，更换管路（38001-618），检查正常无渗漏。

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在对管子的分解中可以看到更多的细节，：

1，在管壁上，可以看到被内部塑型弹簧戳出来的痕迹和孔洞。

2，拆解了另外一端的连接情况，发现塑型弹簧断头实际上嵌入一个端块内。

3，在裂口处，找不到固定弹簧头的端块。

从现象分析判断，存在比较大的可能性是安装时漏装端块或者端块未安装到位，导致弹簧头脱出，在扭曲或挤压的情况下，戳破了管壁所致。

2022年8月，有飞机反应航后地面检查发现FDR OFF灯不亮，与其他飞机对串FDR控制面板，对串FDR和DFDAU无效。进一步验证明确为驾驶舱灯光在暗亮位时FDR OFF灯不亮，明亮位正常亮。最终量线检查发现面板后部D483插头的PIN7与PIN19装反了，实际与WDM不一致。销钉对串后，FDR测试正常。