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我是Mike masters 来自GE 航空在辛辛那提的客户培训服务部门
Mike masters from GE Aviation customer training services in Cincinnati 

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在接下来的CF6维护提示影片中我们将要讨论这个部件
and in the CF6 maintenance minute we're going to talk about this guy right here


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在FADEC控制的80C2和80E1发动机上的连接发动机和EEC的PS3空气信号管
which is the ps3 Air signal line from the engine to the EEC on the 80C2 and 80E1 FADEC control models


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什么是ps3? 它是来自于燃烧室的静压空气压力值
what the ps3 is? that's the static air pressure of the air being delivered to the combustor,

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它是EEC的重要信息来源
It‘s a major source of information for the EEC 

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很多的EEC计划都基于PS3, 所以我们需要非常小心的维护PS3信号管
A lot of scheduling is based on ps3, so we want to maintain this ps3 line very very closely 

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我们接下来要讨论的是这根管子的正确安装方向
what we are going to talk about is the proper orientation of this line

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我们最近对这根管子进行了改进
and has been revised at here recently, the problem with the 

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之前构型的问题是有时水汽会集聚在这根管内
previous configuration was that we would
sometimes get moisture trapped in this line

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或者更坏的情况下水汽会被吹入压力传感器
or worse yet that moisture would blow into the pressure transducers of the EEC

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之前的构型没有考虑到这一情况，所以新构型的管子朝向改变了
and they don't care for that a lot, so the orientation of the line was changed

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这样一来水汽会被排出
in such a way that moisture would drain out. 

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那么水汽从哪儿来的呢？
now where do we get moisture? just atmospheric moisture
flying around, this area coming from

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这个区域的气体来自于发动机燃烧室，热气含有很多水汽
the combustor area of the
engine, like some hot it can contain a

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一旦空气到达风扇机匣和风扇包皮之间的区域
lot of moisture once that air reaches
this area between the case and the fan cowl

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这个区域的低温会促使水汽凝结
it's nice that cold out here that allows
that moisture to condense out and the

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使水汽在管内凝结或吹进EEC的压力传感器
either trapped in the line or blown into
the pressure transducers of the EEC

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在那些情况下我们会拆下这根管子呢？
so why would we remove this line? 

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有可能是在排除从EEC发出的PS3相关的故障
to begin with well perhaps for troubleshooting a PS3 related fault message from the EEC

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或者发现小的渗漏,像水汽凝结
may be there is a small leak or small obstruction likes a moister

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这些水汽还在PS3工作正常的信号管中
that is still in the PS3 of its normal intended scheduled 

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另外一个比较常见的原因是水洗发动机时候拆下这根管子
another really common reason to remove the line is to facilitate a
compressor water and wash 

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当我们向发动机核心机喷入水来清洗压气机叶型时
when we spray water down the core of the engine to clean the airfoils 

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水汽非常容易的进入到PS3管路中到达EEC
it's very easy obviously for that moisture to join the
PS3 signal air coming to the EEC 

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所以在水洗程序之后需要拆下这根管子，或者至少断开管子
So remove the line least disconnect it and then blow it out with typically with nitrogen

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通常使用氮气吹出水汽来确保没有水汽在管内留存
following the water washed just to make sure there's no moisture trapped in it

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接下来我会拆下这根管子，在这之前我已经松开了
I am going to remove the line for you I did
take the liberty of loosening it already

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这就是拆下来的管子，我想给你指出几个需要注意的细节
and here is the line as it comes off the engine, couple details about it

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一头是笔直的接头
I want to point out to you notice that one side is just a straight shot in here 

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在另一头是90度的弯头
on the other side we have this this curve cover 90 degree elbow 

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需要记住的是直头连接的是风扇机匣下部的管接头
thing to remember about this is he straight side of the line connects to the lower fitting the fan case

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90度的弯头连接的是EEC
The elbow 90 degree elbow is what connects to the EEC

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原始安装方式正好和现在相反,然后修正到现在的安装方式
the orientation used to be basically opposite and it was revised to position the line like this

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来帮助排除系统中的水汽
to try again to facilitate you know that trap moisture getting trapped moisture

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来防止水汽在管内凝结
out of the system are preventing it from being trapped

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另外把弯头放在连接EEC一端的目的是
in addition to putting the curve side of the line into the EEC

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我们想确保弯头指向发动机前方
we also want to make sure that the line is the elbow is pointing forward towards 

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我们想确保弯头指向发动机前方
the front of the engine now use the engine as an orientation

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弯头指向这个方向
we want this elbow to be pointing in that direction

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好了,我们把管子装回,连接好并用手拧紧
ok I'm reinstalling the line being connected and hand tight

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当然我们需要按照AMM手册来磅紧并安装保险丝
obviously we would go ahead and torque them to AMM values and then lock wire

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我想指出的是连接EEC的弯头
and what I want to point out to you is that the elbow again connected to the EEC and

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这个弯头应该指向发动机前方
elbow is pointing towards the front of the engine 

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如果我们每次都按照这个方向安装管路
if we position the line in this fashion every time it's replaced we should not have to worry about that

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我们就无需担心管路内的水汽问题
moisture issue trapping moisture in that line, ok and as always

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好的，谢谢您一直以来维护CF6发动机
thanks for all the great things you do up there and maintaining CF6 powered fleet

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下次见
See you next time