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
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
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
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,
它是EEC的重要信息来源 It‘s a major source of information for the EEC
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
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
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
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
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
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
这样一来水汽会被排出 in such a way that moisture would drain out.
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
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
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
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
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
在那些情况下我们会拆下这根管子呢？ so why would we remove this line?
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
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
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
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
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
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
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
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
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
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
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
在另一头是90度的弯头 on the other side we have this this curve cover 90 degree elbow
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
90度的弯头连接的是EEC The elbow 90 degree elbow is what connects to the EEC
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
来帮助排除系统中的水汽 to try again to facilitate you know that trap moisture getting trapped moisture
来防止水汽在管内凝结 out of the system are preventing it from being trapped
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
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
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
弯头指向这个方向 we want this elbow to be pointing in that direction
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
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
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
这个弯头应该指向发动机前方 elbow is pointing towards the front of the engine
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
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
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
下次见 See you next time