维护提示 | 关于双发FF差异
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<span style="font-size: 15px;">关于左右主油箱燃油消耗率不一致的问题，之前已经分析过：</span>
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<span style="font-size: 15px;"><a target="_blank" href="http://mp.weixin.qq.com/s?__biz=MzAwNzkyMTg1Mg==&mid=2247486816&idx=1&sn=83d71b4e0806706780d0ad9e48231ffb&chksm=9b7784b3ac000da51c54294a4857e1b66c7dfc0baaedc9038d736fd64a8c089287dcb9bf135a&scene=21#wechat_redirect" textvalue="关于主油箱燃油耗量不一致的排故思路" linktype="text" imgurl="" imgdata="null" data-itemshowtype="0" tab="innerlink" data-linktype="2">关于主油箱燃油耗量不一致的排故思路</a><br/></span>
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<span style="font-size: 15px;">出现这种情况，主要有两个原因：</span>
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<span style="font-size: 15px;">1、左右燃油系统存在串油</span>
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<span style="font-size: 15px;">2、左右发动机FF存在明显差异<br/></span>
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<strong>1</strong>
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<strong>事件背景</strong>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">某737NG飞机，机组写本：1号发动机油耗比2号发动机多40KG/小时。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">询问机组，机组反映空中左右发燃油流量显示也是差0.04左右。查看AHM ACMS起飞报和巡航报，发现与机组反映的情况基本一致：</span>
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<span style="background-color: #ffffff; letter-spacing: 0.544px; text-indent: 0em; white-space-collapse: preserve-breaks; text-align: justify; font-size: 15px; color: #d92142;">▲</span><span style="background-color: #ffffff; color: #404040; letter-spacing: 0.544px; text-indent: 0em; white-space-collapse: preserve-breaks; text-align: justify; font-size: 15px;">巡航报FF左发比右发高46</span>
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<span style="font-size: 15px; letter-spacing: 0.544px; text-indent: 0em; white-space-collapse: preserve-breaks; text-align: justify; background-color: #ffffff; color: #d92142;">▲</span><span style="font-size: 15px; letter-spacing: 0.544px; text-indent: 0em; white-space-collapse: preserve-breaks; text-align: justify; background-color: #ffffff; color: #404040;">起飞报FF左发比右发高54</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">提醒放行人员参考AMM TASK 28-22-00-730-802 完成交输活门功能测试，确认交输活门在关闭位时，左右主油箱没有串油，判断为正常的发动机性能差异。正常放行。</span>
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<span style="color: #000000;"><strong><span draggable="true" style="color: #000000; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">提示：由于APU使用左主油箱的燃油，左主油箱燃油会消耗减小，所以测试时只需确认右主油箱和中央油箱的燃油没有增加就行。</span></strong></span>
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<strong>2</strong>
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<strong>问题分析</strong>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">有许多因素会影响发动机的燃油消耗率，常见的原因如下：</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">1、正常的发动机性能差异。比如：安装了一台新发和一台旧发；即使是使用时间相同的发动机，性能衰减也会存在差异。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">2、引气系统故障。比如：引气构型差异；HPTACC和LPTACC管路存在渗漏。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">通常，有专门的发动机工程师使用CFM远程诊断来监测发动机性能参数的趋势。</span><span style="font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f; color: #000000;"><strong>正常如果出现比较大趋势跳变，厂家也会发CNR进行提醒。</strong></span><span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">平时最常见的CNR是EGT指示的。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">一般会通过比较DELTA EGT 、N2、EGTM、FF这四个参数的变化趋势来判断原因。发动机工程师对这些是非常熟悉的。</span>
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<strong>3</strong>
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<strong>维护提示</strong>
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<span style="color: #3f3f3f;font-size: 15px;letter-spacing: 0.544px;text-indent: 0em;">两台发动机的燃油流量差异没有限制。</span><span style="color: #000000;"><strong><span style="color: #000000;font-size: 15px;letter-spacing: 0.544px;text-indent: 0em;">在运行中观察到的两台发动机的燃油流量差异不应用于确定发动机的可用性，除非观察到其他发动机参数异常。</span></strong></span>
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<span style="font-size: 15px;letter-spacing: 0.544px;text-indent: 0em;color: #000000;"><strong>注：与FF直接相关的参数就是EGT。正常情况下，对于一台发动机，FF升高EGT也会跟着升高。</strong></span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">当机组反映空中左右主油箱消耗率不一致时，可以查看AHM ACMS起飞报和巡航报，确认是否为发动机FF差异导致的。如果确认是左右发FF差异导致的，通过查看一段时间内的ACMS报文，或者CFM网站上的性能趋势监控，可以进一步判断有没有FF的突变。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">在时间允许的情况下，可参考AMM TASK 28-22-00-730-802 完成交输活门功能测试，确认交输活门在关闭位时，左右主油箱没有串油。</span>
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<span draggable="true" style="color: #3f3f3f; font-size: 15px; text-decoration-style: solid; text-decoration-color: #3f3f3f;">发动机FF指示故障，可以参考MEL 73-05保留：<br/></span>
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