发动机日常维护经验之79章

jagues 2020-03-28

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继续737NG发动机的79章

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之前的MPD里，对于装DMS和没装DMS的飞机，磁堵检查间隔是不一样的。装有DMS的飞机，每500FH在EEC自检页面看DMS的状态，拨磁堵间隔是很长的。后来波音的MPD改版，无论装没装DMS，都统一是500FH拨磁堵检查。由此可见厂家对磁堵检查的重视。

今年由于有几起发动机轴断裂造成的空停，磁堵检查也是重点抓的项目。

磁堵检查目前东航出了新规定，主要是对拍照和收集做出了详细的要求，请按新要求执行。

对于AGB/TGB（最前面的磁堵）发现的任何材料，都要特别注意，因为涉及到起动机、EEC发电机、AGB/TGB轴等部件。

对于前、后收油池磁堵上发现的非金属材料，一般是监控滑耗和滑油压力，如果没有异常可以继续使用，并适当缩小检查间隔。后收油池还可能会发现银丝状的非磁性金属材料，也可以按手册要求监控使用。

AMM 79-00-00

(l) If you find non-magnetic metallic hair-link debris in the Aft Sump scavenge screen,continue the engine in service provided that the oil consumption is in the limit (Engine Operation Limits, TASK 71-00-00-800-806-F00).

NOTE: Silver filaments are expected during engine break-in from initial penetration of the center vent tube seal teeth into silver abradable on the oil inlet cover.

1) If the engine is less than 15000 flight hours since new, continue the engine in service provided that the oil consumption is in the limit (Engine Operation Limits,TASK 71-00-00-800-806-F00).

2) If the engine is more than or equal to 15000 flight hours since new, continue the engine operation provided that the oil consumption is in the limit (Engine Operation Limits, TASK 71-00-00-800-806-F00).

Decrease the chip detector inspection interval at 50-75 flight hours. Return to usual inspection interval when the chip detector is found to be clean for three consecutive checks.
If you have repeated finding during the checks of the magnetic chip detector,remove the scavenge oil filter element and send it to laboratory for analysis(Scavenge Oil Filter Element Removal, TASK 79-21-06-000-801-F00 and Scavenge Oil Filter Element Installation, TASK 79-21-06-400-801-F00).