VSV作动环衬套损伤放行标准和更换注意事项
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<strong><span style="color: #ffffff;font-size: 15px;">第一部分</span></strong>
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<span style="font-size: 16px;">缺陷描述</span>
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一架B737NG飞机，由于左发EEC重复出现75-10401故障代码，检查了VSV作动机构。
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检查发现左发VSV部分作动环衬套丢失，具体丢失数量如下。
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<strong><span style="color: #ffffff;font-size: 15px;">第二部分</span></strong>
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<span style="font-size: 16px;">放行标准判断</span>
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根据AMM72-32-00-210-002-F00，第1第2级衬套允许缺失数量是3个；如缺失数量超过4个，200飞行循环修复；如缺失数量超过5个，则立即更换。显然，第1第2级缺失的衬套在手册标准内的。
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衬套腿（leg）缺失是允许的，修复第1第2级新衬套也是把腿打断了才能安装。
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第3级衬套损伤标准在手册没有写，参考手册对第1第2级衬套损伤标准，放行人员认为已经超标了。飞机不带疑问上天，该修修该趴趴。可是<span style="caret-color: var(--weui-BRAND); text-size-adjust: 100%;">第3级衬套不好更换，风险大。于是咨询厂家第3级缺失的衬套能否保留放行，厂家回复衬套缺失不超过10个是可以放行的。</span>
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<span style="caret-color: var(--weui-BRAND); text-size-adjust: 100%;">厂家回复内容翻译大致如下。</span>
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<span style="caret-color: var(--weui-BRAND); text-size-adjust: 100%;">根据对案例的评估，CFM建议如下：由于第3级作动臂销向下定位，很难对作动环衬套进行潜在的检查。因此，第3级<span style="font-size: 16px;letter-spacing: 0.544px;">衬套</span>没有要求检查。此外，CFM在每一级多达10个法兰衬套缺失的情况下做了相关测试，发现发动机的可操作性不会受到影响。鉴于此，在下一次飞行之前不需要采取进一步措施。尽管如此，CFM建议客户尽早更换丢失的衬套。</span><br>
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<span style="font-size: 12px;">原文如下。</span>
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<span style="font-size: 12px;">Based upon evaluation of the case CFM advises as follows:<br style="font-size: 16px;white-space: normal;">Since the Stage 3 lever arm pin is orientated down, it makes potential inspection of actuation ring bushings difficult. Therefore, there is no requirements to inspect bushings at Stage 3. Moreover, CFM performed relevant testing with up to 10 missing flanged bushings per each stage and found that engine operability will not be impacted. By given that, no further action is required before next flight. Nevertheless, CFM recommends replacing missing bushings at very earliest customer opportunity. Stg 1 & 2 bushings can be replaced per 72-32-00-900-801-F00. Stage 3 bushings can be replaced per 72-32-00-900-802-F00 (IGV and Stg 3l ever arms and bushings replacement) and 72-32-00-900-804-F00 (connecting link replacement) procedures. No testing is required other than required per mentioned AMM procedures if any.</span>
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<strong><span style="color: #ffffff;font-size: 15px;">第三部分</span></strong>
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<span style="font-size: 16px;">衬套更换</span>
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第1和第2级衬套可以根据AMM72-32-00-900-801-F00修复。第3级衬套可以根据AMM72-32-00-900-802-F00 (IGV和第3级作动臂和衬套的更换)和AMM72-32-00-900-804-F00(连接环更换)程序进行更换。除AMM程序所要求的以外，不需要任何测试。
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<span style="caret-color: var(--weui-BRAND); text-size-adjust: 100%;">第1第2级衬套在作动臂上部，修复不需要拆任何部件。修复步骤大致如下：清洁安装区域，</span><span style="text-size-adjust: 100%; caret-color: var(--weui-BRAND);">剪掉衬套4个leg，</span><span style="caret-color: var(--weui-BRAND); text-size-adjust: 100%;">将衬套塞进丢失位置，</span><span style="text-size-adjust: 100%; caret-color: var(--weui-BRAND);">在衬套顶部外法兰涂上RTV106胶并固化。</span><br>
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注意不要拆下作动臂，如果不小心使叶片转动了，就可能会带来很严重的后果。
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第3级（和IGV）的衬套在作动臂下部，这也是不易检查，厂家也没有给出衬套损伤标准的原因。
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手册有更换第3级衬套的步骤，而且写的很简单，但实际施工还是有困难的。
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拆装作动臂需要专用工具，以确保叶片不转动，但受空间和环境限制，在翼施工有难度。
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另外，由于叶片顶部的凸台很浅，作动臂适配框边缘又有倒角，并且看不到机匣内叶片，所以很难确保作动臂套牢叶片凸台。
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叶片还会沿着径向上下运动，增加了施工难度。
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机坪打工人
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因此，如果必须更换第3级衬套，一定要了解风险点，并做好充足的准备，必要时使用孔探设备观察确保VSV不转动。
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施工所需航材设备如下。
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专用工具：SPL-9071 Part #: 856A1012G01
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衬套参考件号：9944M44P01/02
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胶件号：RTV106
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