论坛 › B737系列 › 案例分享 ｜ SOURCE OFF灯点亮

机务君 发表于 2024-2-28 17:34:46

案例分享 ｜ SOURCE OFF灯点亮

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                <span style="max-width: 100%;line-height: 2em;color: #595959;white-space: pre-wrap;font-size: 12px;letter-spacing: 2.912px;overflow-wrap: break-word ;box-sizing: border-box ;">世界只有不到</span><span style="max-width: 100%;line-height: 2em;font-size: 14px;overflow-wrap: break-word ;box-sizing: border-box ;"><strong style="max-width: 100%;overflow-wrap: break-word ;box-sizing: border-box ;"><span style="max-width: 100%;font-size: 12px;overflow-wrap: break-word ;box-sizing: border-box ;"><span style="max-width: 100%;color: #ab1942;overflow-wrap: break-word ;box-sizing: border-box ;">1 %</span><span style="max-width: 100%;color: #407600;overflow-wrap: break-word ;box-sizing: border-box ;">&nbsp;</span></span></strong></span><span style="max-width: 100%;line-height: 2em;color: #595959;white-space: pre-wrap;font-size: 12px;letter-spacing: 2.912px;overflow-wrap: break-word ;box-sizing: border-box ;">的人关注了九品机务</span>
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            <span style="max-width: 100%;font-size: 14px;overflow-wrap: break-word ;box-sizing: border-box ;">之前转载的一篇文章——<a target="_blank" href="http://mp.weixin.qq.com/s?__biz=MzI4Njg5MzY4NQ==&amp;mid=2247484754&amp;idx=1&amp;sn=a979303a7a60e81eabd5d2d17bca6c9b&amp;chksm=ebd4b648dca33f5e2e2a0b3d5ace3803e6a95becb48a1306b434a2959e8722705e7d4a412a3d&amp;scene=21#wechat_redirect" textvalue="你真的了解SOURCE OFF灯吗" linktype="text" imgurl="" imgdata="null" data-itemshowtype="0" tab="innerlink" data-linktype="2">你真的了解SOURCE OFF灯吗</a>，深刻分析了SOURCE OFF灯点亮的逻辑。前几天遇到一起SOURCE OFF灯点亮的故障，对电源系统又多了一些思考。</span><br style="max-width: 100%;overflow-wrap: break-word ;box-sizing: border-box ;">
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      <span style="font-size: 14px;">2024年2月，一架NG飞机机组反馈下降阶段10000ft左右高度，右侧SOURCE OFF灯点亮，同时点亮蓝色GEN OFF BUS灯，机组执行检查单（检查单动作为尝试重新衔接发电机电门并视情使用APU供电）后SOURCE OFF灯保持点亮，使用APU供电正常。</span>
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      <span style="font-size: 14px;letter-spacing: 0.578px;">南京过站2号GCU自检IDG FAULT灯点亮，复位后正常，过站MEL保留右发IDG放行飞机，航后更换右发IDG，测试正常。</span>
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                  SOURCE OFF灯点亮逻辑
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      <span style="font-size: 14px;">接到机组报告故障时，有同事提出疑问：既然GCU自检指示IDG故障，为何不点亮DRIVE灯而点亮SOURCE OFF灯？</span>
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      <span style="font-size: 14px;">我们看下DRIVE灯和SOURCE OFF灯点亮的逻辑。<br></span>
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      <span style="color: #ffa900;"><strong><span style="font-size: 14px;">DRIVE灯</span></strong></span><span style="font-size: 14px;">——The amber DRIVE light comes on if the IDG oil pressure is less than the minimum operation limit of <strong>165 PSI</strong> or if there is an underfrequency with the engine running.<br style="font-style: normal;font-variant: normal;font-weight: normal;letter-spacing: normal;line-height: normal;orphans: 2;text-align: -webkit-auto;text-indent: 0px;text-transform: none;white-space: normal;widows: 2;word-spacing: 0px;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;"></span>
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      <span style="font-size: 14px;">1、当GCU采样到每10秒周期有1.5秒以上IDG滑油压力低于165PSI的数据时，则GCU点亮DRIVE灯；<br></span>
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      <span style="font-size: 14px;">2、当GCU探测到永磁发电机频率低于375+/-4 Hz超过6秒时，点亮DRIVE灯。<br style="font-style: normal;font-variant: normal;font-weight: normal;letter-spacing: normal;line-height: normal;orphans: 2;text-align: -webkit-auto;text-indent: 0px;text-transform: none;white-space: normal;widows: 2;word-spacing: 0px;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;"></span>
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      <span style="color: #ffa900;"><strong><span style="font-size: 14px;">SOURCE OFF灯</span></strong></span><span style="font-size: 14px;">——The SOURCE OFF lights show that a transfer bus is not energized from the selected power source. 人工选择的电源没有向相应的转换汇流条供电，或人工选择的电源已断开，则点亮SOURCE OFF灯。&nbsp;<br style="font-style: normal;font-variant: normal;font-weight: normal;letter-spacing: normal;line-height: normal;orphans: 2;text-align: -webkit-auto;text-indent: 0px;text-transform: none;white-space: normal;widows: 2;word-spacing: 0px;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;"> <br style="font-style: normal;font-variant: normal;font-weight: normal;letter-spacing: normal;line-height: normal;orphans: 2;text-align: -webkit-auto;text-indent: 0px;text-transform: none;white-space: normal;widows: 2;word-spacing: 0px;-webkit-text-size-adjust: auto;-webkit-text-stroke-width: 0px;"></span>
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      <span style="font-size: 14px; letter-spacing: 1px;">以GCU1控制逻辑为例，根据SSM24-22-11，SOURCE OFF灯点亮的条件有两个，分别由紫色线路和绿色线路标出</span>
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      <span style="font-size: 14px; letter-spacing: 1px;">1、GCU1探测到EPC，对应的GCB和对应的APB均在断开位。</span>
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      <span style="font-size: 14px; letter-spacing: 1px;">2、对应的APU电源电门没有闭合，但是APB已经闭合。</span>
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      <span style="font-size: 14px;">空中右发IDG发生故障无法供电时，GCU2控制GCB2断开，APU未起动时，APB在断开位，空中EPC在断开位，满足SOURCE OFF灯点亮逻辑。GCB2断开时，两个BTB自动闭合，使两个交流转换汇流条都有电。</span>
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      <span style="font-size: 14px;">同时由于GCB2断开，点亮蓝色<strong><span style="font-size: 14px;color: #0052ff;">GEN OFF BUS</span></strong>灯。<br></span>
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      <span style="font-size: 14px;">综上，只有当IDG滑油压力低或欠频时，才会点亮DRIVE灯。由于GCU会监控IDG的供电品质，当发生IDG欠压、超频、IDG中的旋转二极管短路等情况时，同样会点亮IDG FAULT灯并切断IDG的供电，从而点亮<span style="font-size: 14px;color: #ffa900;">SOURCE OFF灯</span>和<span style="font-size: 14px;color: #0052ff;">GEN OFF BUS灯</span>。</span>
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    </section>
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      </section>
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      <br>
    </section>
</section>

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