737MAX专题 – 第 30 页

MAX布罩安装

MAX飞机布罩大小刚好能罩住进气道，如果外侧上部的钩子挂的太低，就会出现进气道下部无法完全罩住，长期还容易造成布罩损坏，需维护中注意。

737MAX飞机LEAP-1B发动机燃油喷嘴拆装

LEAP-1B 发动机的燃油喷嘴，也有积碳（结焦）的安全隐患，尽管此问题可通过加装 CFM即将发布的 RBS 系统后得到解决，但当前的过渡阶段仍然面临定期更换全套（或部分）燃油喷嘴问题。此拆培训材料用于拆装步骤和安全方面的提醒。

737MAX的地扰控制故障

2023年5月，有MAX飞机反应MAINT灯亮。

状态信息1为SPOILER CONTROL CHANNEL ，相应维护信息为27-01330 GROUND SPOILER OUTPUT DRIVER SIGNAL IS OUT OF RANGE Detected by: SPOILER CONTROL ELECTRONICS (SCE)；

状态信息2为GROUND SPOILER CONTROL，相应维护信息为27-01220 GROUND SPOILER CONTROL MODULE IS NOT IN COMMANDED POSITION Detected by: SPOILER CONTROL ELECTRONICS (SCE)。

复位P18-1 B4 和P6-1 A16跳开关故障依旧，整机断电后重新上电，故障依旧，27 – Spoiler Control, SYSTEM TEST, Ground Spoilers测试时发现地面扰流板升不起来，27 – Spoiler Control, OPERATIONAL TEST, SCE Test测试通过。

27-01330 GROUND SPOILER OUTPUT DRIVER SIGNAL IS OUT OF RANGEDetected by: SPOILER CONTROL ELECTRONICS (SCE)的可能性故障部件为：

(a)The ground spoiler control module, M2988.

(b)The ground spoiler control relay, R1169.

(c)The spoiler control electronics, M2940

(d)The problem with the wiring.

27-01220 GROUND SPOILER CONTROL MODULE IS NOT IN COMMANDED POSITION Detected by: SPOILER CONTROL ELECTRONICS (SCE)的可能性故障部件为：

(a)The ground spoiler control relay, R1169.

(b)The spoiler control electronics, M2940

(c)The ground spoiler control module, M2988.

(d)The problem with the wiring.

从故障信息看，SCE取的是GSCM的预位和控制电磁线圈的电流值，用于监控是否在可控范围。当不在范围时，就给出相关警告。从排故结果看，是R1169故障导致的。符合IFIM中关于27-01220的故障可能排序。SCE自检测试能通过，也表明SCE是没有问题的。关于GSCM内部液路作动原理课参看另外一篇关于扰流板无法收回的说明。

截止2023年6月，波音全球的统计数据如下

RECOMMENDATION:
27-02790 SPOILER FAULT OUTPUT DRIVER SIGNAL IS OUT OF RANGE:
Operators have reported SPOILER CONTROL CHANNEL status messages. Boeing finds these messages may occur during power up, often with maintenance message 27-02790.

To minimize the chance of dispatch delay, Boeing recommends to perform the following FIM based maintenance checks for occurrence of SPOILER CONTROL CHANNEL status message with MMsg 27-02790 (SPOILER FAULT OUTPUT DRIVER SIGNAL IS OUT OF RANGE):
– Use the OMF to perform the ground test 27 – Spoiler Control OPERATIONAL TEST, SCE Test.
-Refer to AMM Task 27-61-45-730-801 – Spoiler Control Electronics Self – Test.
-Note that the SCE ground test requires the Master Dim and Test (MD&T) be in the bright (BRT) position.
-Confirm the MMsg 27-02790 is cleared by the Ops Test.
-If cleared, the system is OK for dispatch.
-If the fault is still active, use FIM Task 27-61-00-810-922 to troubleshoot and diagnose the issue.

MEL dispatch relief is available for SPOILER CONTROL CHANNEL.
MEL 27-61-01-01 should be reviewed for applicability.

MITIGATION:
27-02790 SPOILER FAULT OUTPUT DRIVER SIGNAL IS OUT OF RANGE:
Boeing and the SCE supplier (BAE) are investigating the root cause of this message and assessing the appropriate Spoiler Control Electronics software change(s) to appropriately address these faults.

737MAX”ENG 1 0IL DEBRIS SENSOR”状态信息

2023年5月有飞机在关车后，出现“ENG 1 0IL DEBRIS SENSOR”状态信息，含义如下：

The EEC will set this message when the oil debris monitoring system (DMS) sensor is failed for 5 seconds.(a)This fault is only detected and annunciated by channel B.

代码为71-09001 “ONBOARD MAINTENANCE FUNCTION HAS NO INPUT FROM ENGINE-1 EEC”，737MAX-FTD-71-22002对该信息做过说明，如果将EEC置于TEST模式，则可以清除故障。同时波音建议如果发现MAINT灯亮，波音建议运营人
不要将MAINT灯与维护信息71-09001与/71-09011联系到一起，并采取进一步的排故来寻找MAINT灯亮的来源。