把组件灯再现点亮和自动点亮原理搞清楚
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<span style="font-size: 16px;">最近遇到几起组件灯亮故障，有的是单项活门丢失，有的是有冲压门作动筒故障。天气渐热，空调故障可能也会增多。本篇谈谈737NG飞机组件灯亮的一些排故思路和译码分析，本文分析的故障没包括线路故障和指示故障（如过热电门故障）。</span><br>
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组件灯何时亮
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<span style="font-size: 14px;font-family: 宋体, SimSun;">组件过热</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">组件灯自动点亮，组件活门关闭。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">组件灯再现亮，按压主注意灯可复位，组件仍可正常工作，通常自检控制盒有故障指示灯。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">温度控制系统双通道故障</span>
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自动点亮组件灯并且无法复位，通常自检控制盒有故障指示灯。这种故障概率相对比较小。
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组件自动点亮分析
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<strong>系统原理</strong>
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<span style="font-size: 16px;">如下图，三个过热电门并联控制ACAU内部K8继电器。组件温度达到一定值时，过热电门闭合接地，K8线圈接通继电器闭合。一个电门点亮组件灯，一个电门接地锁定K8保持在闭合状态，</span>还有一个电门用于关闭组件活门(FCSOV)。<span style="font-size: 16px;"></span>
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<span style="font-size: 16px;"><span style="font-size: 16px;">只有过热现象消失并且按空调面板复位电门(TRIP RESET )才能复位。</span></span>
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<span style="font-size: 16px;">三个过热电门监控不同位置的温度，电门没有经过区域温度控制盒，所以组件过热跳开控制盒不会产生故障代码，也无法判断是哪个电门过热。</span>
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<strong>故障分析</strong>
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<span style="font-size: 16px;">组件过热，要么就是没冷气了，制冷部件ACM故障或散热器性能下降；要么就是热气太多，温度控制（热路）部件TCV(STCV)故障。排故时可以检查以下这些部件是否有异常现象。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">ACM</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">异响，卡阻，力矩过大，启动缓慢。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">散热器</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">冲压门全开灯亮，有异物堵塞。冲压门作动筒故障，旁通单位活门丢失。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">作动卡滞，电容鼓包，管路漏气。</span>
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<span style="font-size: 14px;font-family: 宋体, SimSun;">控制管路漏气。</span>
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<span style="font-size: 16px;">如果制冷部件性能下降，还可以按SL737-SL-21-108检查组件制冷情况。将三个舱的温度选择电门放自动位，检查三个温度是否在以下范围:组件温度30°，驾驶舱管道温度10°，客舱管道温度20°。如果温度超过以上值，说明空调制冷效果不好，需要清洗散热器或者更换ACM。检查时确认TCV和STCV都在关闭位并且下游没有热气渗漏。</span>
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<span style="color: #333333;" data-form="0" data-num="1">三</span>
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<span style="font-size: 16px;letter-spacing: 1.5px;text-align: center;background-color: #fefefe;">组件灯再现点亮分析</span>
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<strong>系统原理</strong>
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<span style="font-size: 16px;">温度控制系统有主备两套，分别由左右区域温度控制盒控制。控制盒输出指令的同时，也接收各温度传感器和活门的位置反馈信号。如果控制盒探测到部件失效信号，通过P5空调面板点亮组件灯。</span>
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<span style="font-size: 16px;">如下图，K1通电常闭。最上与门接收控制盒和再现信号。温度控制单通道失效时，与门一个输入信号为1。再现时另一个输入信号也为1，与门输出1，通过或非门点亮组件灯；如按压主注意灯复位，与门输入信号为0和1，输出为0，组件灯灭。</span>
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<span style="font-size: 16px;">如果两个控制盒都探测到故障，即双通道失效，由于中间与门不接收再现和复位信号，输出信号始终为1，不受再现与复位的影响，组件灯自动点亮并且无法复位(非过热点亮)。</span>
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<span style="font-size: 16px;">MASTER CAUTION (PUSH TO RESET)</span>
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<strong>故障分析</strong>
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<span style="font-size: 16px;">控制盒接收到失效信号时，除了点亮组件灯，还点亮控制盒上对应的故障灯，指示具体的故障部件。如果遇到组件再现点亮，需要自检控制盒检查故障代码（指示灯），按代码排故。</span>
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</p><span style="font-size: 16px;">区域温度控制盒有两个，件号是一样的，完全可互换，部分温度控制模块互为备份。值得注意的是，同一个故障灯在不同位置的控制盒指向的部件不同，需要注意区分，以免误换件。</span><br>
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四
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排故方向的确定
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<span style="font-size: 16px;">综上所述，组件灯亮可能是温度控制系统有问题，也可能是制冷系统有故障，如不了解具体故障情况，排故可能会走不少弯路，甚至会导致故障重复出现。因此，详细了解故障现象显得很重要，能起到事半功倍的作用。</span>
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<span style="font-size: 16px;"><strong>了解故障信息</strong></span>
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<span style="font-size: 16px;">如遇到组件灯亮，为了便于排故，需要了解以下信息。</span>
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<span style="font-size: 16px;">(1)组件灯在哪个阶段亮，是自动点亮还是再现点亮；复位是按压主警告灯复位，还是按压空调面板复位电门复位。</span>
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<span style="font-size: 16px;">(2)组件灯亮之前有无感觉热，组件灯亮后有无感觉气量变小？</span><span style="font-size: 16px;letter-spacing: 0.034em;-webkit-text-size-adjust: 100%;">是否人工关闭过组件电门？</span>
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<span style="font-size: 16px;">(3)自检控制盒查看代码（复位组件后），再现检查组件灯。</span><span style="font-size: 16px;letter-spacing: 0.034em;-webkit-text-size-adjust: 100%;">运行空调，检查制冷是否正常。</span>
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<span style="font-size: 16px;">通过以上信息判断是组件过热，还是温控系统故障。</span>
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<strong>译码判断</strong>
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<span style="font-size: 16px;">排故方向的确定还有一个辅助的方法就是译码。如果获取的故障信息不足，有必要译码检查组件是否过热跳开。有些公司飞机可能改装有组件出口温度监控系统，能直接监控到组件出口温度，判断组件是否真实过热。对于没有改装的飞机，只能使用有限的数据分析。</span>
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<span style="font-size: 16px;">从SSM21-51-11图上看，空调系统给FMC提供两个信号，流量模式和组件活门位置。流量模式信号由K14控制，而K14受组件电门S4，组件过热继电器K8和继电器K18控制，其中K18跟另一组件活门和襟翼位置有关。QAR活门位置信号则直接从活门实际位置电门反馈。</span>
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<span style="font-size: 16px;">译码可以看到三个参数，组件流量（电门）、组件活门和活门开度。我们需要流量模式和活门位置来判断组件是否跳开。组件的位置直接可以从译码数据得到，活门开度无实际意义，不需要看。流量模式的判断还需要结合组件电门的实际位置。</span>
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<span style="font-size: 16px;">组件电门自动位时，译码流量在低位(low)，活门在开位。</span><span style="font-size: 16px;">组件电门关闭或组件过热跳开，活门关闭时，</span><span style="font-size: 16px;">译码流量显示关/高位，活门显示关。</span><span style="font-size: 16px;">组件电门在高位或者另外一个组件活门关闭导致K8到高位时，电门在关/高位，但是活门保持在开位。</span>
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以下是旁通单位活门丢失导致的组件过热译码数据。组件过热后，活门从开变关，流量从低位变关/高位。如果襟翼收上，另一侧的组件流量从低位变关/高位。
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<span style="font-size: 16px;"></span>
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<span style="font-size: 16px;">以下是关车后引气压力低活门关闭译码数据。活门从开位变关位，流量保持在低位。</span>
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<span style="font-size: 16px;"><br></span>
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<span style="font-size: 16px;">一般机组不会轻易触动组件电门，除非机舱温度高或者组件过热跳开。如果机舱温度高，说明组件确实过热；如果组件跳开机组才去作动电门，那么作动前译码是能看出组件跳开的。因此译码对指导排故还是有一定的作用。</span>
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<span style="font-size: 16px;"><br></span>
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<section style="border-width: 1px;border-bottom-style: solid;border-color: #a3a3a3;box-sizing: border-box;">
<section style="border-width: 1px;border-bottom-style: solid;border-color: #303030;display: inline-block;padding-right: 5px;padding-left: 5px;box-sizing: border-box;">
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<p style="letter-spacing: 2px;">
<span style="font-size: 14px;color: rgb(0, 82, 255);">◆<a target="_blank" href="https://mp.weixin.qq.com/mp/appmsgalbum?__biz=MzI4Mzc4MjQ3OQ==&action=getalbum&album_id=1555391414518235137#wechat_redirect" textvalue="手册使用技巧" tab="innerlink" data-linktype="2">手册使用技巧</a></span>
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<a target="_blank" href="https://mp.weixin.qq.com/mp/appmsgalbum?__biz=MzI4Mzc4MjQ3OQ==&action=getalbum&album_id=1772792874770710534#wechat_redirect" textvalue="◆高清CBT学习系统原理" tab="innerlink" style="font-size: 14px;letter-spacing: 2px;color: rgb(0, 82, 255);" data-linktype="2"><span style="font-size: 14px;letter-spacing: 2px;color: rgb(0, 82, 255);">◆高清CBT学习系统原理</span></a>
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