来源：737MAX-FTD-24-22004
波音收到部分运营人的报告，反映737MAX飞机的IDG 1725616使用的是SEC滤子。用非SEC滤子会降低IDG的可靠性。波音建议在准备MPD任务24-040-01与 24-040-02时，确保SEC滤子（P/N 5910422）有料，并确保油滤和封圈全部更换。
我司当前使用的IDG件号为761574B，不存在该问题。但不排除后续引进构型发生变换，需注意严格按手册执行。
以下为IDG与油滤的匹配性说明。
737MAX的IDG油滤适用性
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分类： 737MAX专题
737MAX水平安定面配平不正常故障
737MAX执行737-SL-21-147纠正措施时的问题
外部案例
有客户在执行SL 737-SL-21-147时发现管路干扰。建议的维护措施已用尽，但仍无法解决问题。更换较长的紧固件似乎是唯一的选择。波音公司认为，使用螺钉和垫片作为永久性维修是可以接受的。波音公司还确认，可以使用更长的螺钉/垫片来防后续飞机上的纠正。
Question:
Customer found tube interference when performing SL 737-SL-21-147. Recommended maintenance dispositions were exhausted but still could not solve the issue. Replacing by longer fasteners seems to be the only option.
Answer: •Boeing finds it acceptable to use the screws and spacers as a permanent repair. •This response is limited to this Service Request and should not be thought of as a blanket approval for all potential applications or substitutions. • •The repair was considered minor with RDR grant • •Boeing also confirms that the longer screws/spacers can be used to prevent the subject riding condition on future aircraft.
737MAX飞机顶起状态下MFD页面抑制
外部案例
有反应报告说，当飞机在顶起状态处于“空中”状态时。当“在空中”时，客户发现MFD功能被禁用，因此无法进入MFD和工作步骤，客户怀疑在任务之前应该有其他步骤，先使用PSEU并将a/c置于“地面”状态。波音表示MFD维护功能不可进入，当飞机在空中状态时。波音拟对对施工步骤程序做调整，以满足在顶升时，可以执行操作测试。
Question:
“…reported that when a/c on jack and the a/c is “in air”. When “in air”, customer found that the MFD function is inhibited, so they cannot enter MFD, and the work step…, customer suspects there should be other steps before the task, to use PSEU and put a/c “on ground”.”
Answer:
Boeing confirms that the MFD maintenance function is not accessible while the airplane is on jacks due to being “in air” mode.
Boeing advises customer to perform the operational test while not on jacks at this time while Boeing re-evaluates the procedure while on jacks. Boeing will send a follow-on message when an updated procedure for the operational test on jacks is available.
关于737MAX恢复商业运行技术风险评估
集团内737MAX机型在停飞三年后重新投入商业运行，基于期间该机型在全球的运行经验和期间FIX、WTT会议材料、FTD/SL、SB（累计339份）对737MAX重新投入运行后的风险做一梳理。梳理部分从核心风险项目、隐性安全影响、显性安全影响、维护风险、机组提示五个维度等级展开，并对评估认为需采取应对措施的项目做一说明。