关于737NG 发动机5级引气活门安装程序的说明

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前面的文章中提到的AMM手册中发动机5级引气单向活门的安装问题：

FAA发布737发动机5级引气单向活门检查紧急AD

▲ 0.25 英寸该如何测量？

咨询厂家后，确定此处AMM手册描述不适用于737NG，而是适用于737MAX，计划在后续AMM手册中进行修订：

▲ 737MAX，ref /B/：IPCV Alignment Attachment

▲ 737NG，Ref /A/：AMM TASK 36-11-02-400-801
SR 4-4822025320
The intent of the Ref /A/ task is to ensure that the protruding ends of check valve's flapper shaft is parallel with the engine case / fifth-stage port. The goal is to maximize the clearance between the flapper shaft ends and inner wall of the thrust reverser.
The 0.00 ±0.25 in. (0.00 ±6.35 mm) tolerance is better suited for the 737MAX as there are alignment marks on the mix manifold duct and intermediate pressure check valve. Refer to ref /B/ attachment.
Boeing has initiated a publication change request (PCR) to remove the tolerance from the Ref /A/ task for the 737NG. This change will be reflected on or before the 15-Feb-2021 revision.

推荐阅读：

• FAA发布737发动机5级引气单向活门检查紧急AD
• 5级引气单向活门卡阻导致发动机空停
• 维护提示 | 引气调节器供气压力传感管破裂导致全程引气压力低/无引气

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