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混合总管上余水管接头断裂

齐根断裂，怀疑是撞断的。用于收集混合总管的冷凝水。波音提供可临时修复的方案。包括接头重做和更换余水组件。

190158074A-Attachment-1下载
190158074A-Attachment-2下载

For a permanent repair of the damaged tube, Boeing recommends removing and replacing the damaged 65C33447-4 drain manifold.      

a. Separating parts bonded together using SOPM 20-50-12, Type 70 cured at room temperature can be challenging.  Boeing recommends to heat the bondline with a heat gun to 225 – 250F.  While heating gently exert pressure to pry apart using a plastic wedge or other soft tool.  Do not heat the part, allow part to cool and then reheat.  This will post cure the adhesive and make successful removal more difficult.  Upon removal from the assembly remove all residual adhesive from the bond area of each detail part. 

b. Lightly abrade faying surfaces with 180-grit or finer paper in accordance with SOPM 20-30-03, until gloss and any contaminants are removed. Use only new clean sandpaper for abrading. 

c. Clean in accordance with the Final Cleaning section of SOPM 20-30-03.  Wipe clean with a dry wiper.

d. Bond new 65C33447-4 drain manifold per SOPM 50-20-12 Type 70.  Ensure the drain tube hole is not filled with adhesive and fully exposed inside the drain manifold to allow the proper drainage.

As a temporary solution for 10 FC, the broken tube can be installed in place and bonded to the the mix manifold drain assy with RTV157 sealant provided no leak from the sealed area.

散热器扩散管旁通活门卡阻导致冲压空气作动器故障

ISE-21-20-34229

有运营人提出在超过40000FH的飞机上常发扩散管单向活门卡阻，这个问题会导致BITE时出现冲压作动器故障信息(由于冲压空气不足)。目前排除该故障的唯一方法是更换活门或扩散管，造成延误。他们对过去5年的维护数据进行了分析，结果显示，虽然总数很低，但趋势正在上升，可以预见未来会造成更多的失效。数据显示，故障通常发生在比机队平均机龄(20000 FH)老1.8倍(40000FH)的飞机上。另一个问题是，有少部分活门会丢失，产生PDA。
该航司有兴趣就可靠性问题展开讨论，制定维护计划进行检查/润滑，并向波音公司申请维修(永久或临时)在航线上发现的被卡住的阀门。

点评：单向活门丢失问题见–空调排气旁通单向活门丢失，冲压空气作动器的问题很多，单一用卡阻影响了气流，不足以说明全部问题。

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