B737-NG飞机38章常见问题处理.doc

38章常见问题处理 - 1 乘务反应3个厕所都不冲水，该如何处理？2 过站，如果厕所水龙头一直漏水，怎么办？3 针对单个厕所故障，如何判断是冲洗活门问题，冲洗电门还是FCU故障呢？4 如果后乘务员面板CLEAN/CHECK SENSOR灯亮，该如何处理？（故障1）乘务反应3个厕所都不冲水。我们第一反应是真空泵故障，依据MEL38-02A可以保留。看下面原理图：如果控制线路故障了，厕所还能保留吗？答案是不能的，就类似13年工程部出的偏差事件，拔了VACUUM WASTE CONT跳开关导致所有厕所空中都不能冲水。所以第一我们要先确定厕所是不是控制线路出问题了，如果控制线路是好的，才能保留。怎样才能知道控制线路是好的？听冲洗活门马达作动的声音，或者看马桶上有没有水流下来。如果有以上现象说明控制线路是好的。这时可以依据MELMEL38-02A拔出真空泵跳开关，不能拔VACUUM WASTE CONT跳开关。真空泵跳开关需要十字解打开P91面板才能接近。（故障2）如果厕所水龙头一直漏水尝试多按压几次水龙头，看能否恢复，如不能。则打开水龙头下面的柜门，把控制开关打到TOILET ONLY 位置，正常是在SUPPLY ON 位置。然后跟乘务员做好解释。贴标牌并按MEL38-01A办理保留。（故障3）单个厕所故障，如何判断是冲洗活门问题，冲洗电门还是FCU故障首先按压冲洗电门有声音的情况：1）如果能听到冲洗活门马达作动的声音或者马桶能有水出来或者真空泵能响，可以判断冲洗电门是好的。2）如果能听到冲洗活门马达作动的声音，但是马桶堵住了，脏东西冲不下去，说明被堵了或冲洗活门故障。没有声音的情况：可能原因：冲洗电门，FCU,线路问题冲洗电门可以通过量线确定好坏，插头是快卸的线路问题，如果是单个厕所故障，就不用考虑3个厕所公共部分线路。剩下的就是FCU故障了。FCU的作用：冲洗循环过程中控制冲洗活门，冲水活门，真空泵工作。 （故障4）乘务员面板CLEAN/CHECK SENSOR灯亮4 请看下面的解释The CLEAN/CHECK SENSOR light comes on when the waste tank level is three inches (7.6 cm) or more below the tank full level and one of these conditions occur: A point level sensor is fouled (dirty) A point level sensor has failed the power-up BIT test or the continuous monitoring test There is a sensor disagreement. A sensor disagreement occurs when one point level sensor sends a tank full signal and the other point level sensor sends a tank not full or sensor fouled signal.出现此灯亮，第一步：可以先做测试，看灯能否消失。第二步：如果灯还是亮，有可能传感器脏了，叫清洁队排污车多用清水冲洗污水箱。一般都能解决此问题。Functional DescriptionThe flush cycle starts when a flush signal is received from theflush switch. Each flush cycle has the following steps:* Rinse valve opens to rinse the toilet bowl按压冲洗电门一秒钟后开只开0.7秒* Rinse valve closes1.7秒后关* Flush valve opens to drain the toilet contents.两秒钟后开一共开4秒钟* Flush valve closes.When the rinse valve is open, eight ounces of water flushes thetoilet bowlThe flush control unit (FCU) controls the operation of thesecomponents during the flush cycle:* Vacuum blower* Rinse valve* Flush valveWhen you push the flush switch, the FCU immediately starts aduty cycle inhibit. The duty cycle inhibit prevents another inputfrom the flush switch for the next 15 seconds.The FCU also sends a signal to operate the vacuum blower. Thevacuum blower will operate if the airplane is below 16,000 feetand the waste drain ball valve is closed. The FCU sends thevacuum blower signal for 15 seconds.One second after the flush cycle starts, the FCU opens the rinsevalve. The rinse valve is open