进近阶段右侧飞行指引消失，为什么总是右侧？

sherry2009 · 发表于 2016-1-4 22:40:55

RT，此类故障通常与同侧RA有关，通常复位跳开关即可。查阅了公司近年来的技术信息库，发现此类故障多发生在右侧，哪位大神有研究过？

cccjjjbbb · 发表于 2016-1-4 23:36:34

因为大多数排故都是优先1#，久而久之会导致1#的机器性能普遍好于2#，瞎猜的

khe_2006 · 发表于 2016-1-5 10:37:31

F/D Comparator
The flight director comparator operates during these conditions:
• Takeoff mode and below 400 feet
• Go around mode and below 400 feet
• Approach mode and below 800 feet.
During this time, the F/D comparator detects the F/D failures which are not
detected by continuous monitoring or annunciated by a sensor valid and
which could provide erroneous information to the pilot-in-command. In each
FCC, this monitor compares local pitch and roll F/D commands with the
corresponding cross-channel F/D commands. The local F/D only is BOV if
the difference exceeds a given value.
F/D Names
Like the A/P, the F/D may be called one of these names:
• Channel A or channel B.
• Local (LCL) or foreign (FGN)
• Master or slave.
It is the same for the F/D as it is for the A/P, except for the master/slave
relation when at least one A/P is engaged. If an A/P is engaged in CMD, it is
the master.
F/D Pitch and Roll ConF/D Names
Like the A/P, the F/D may be called one of these names:
• Channel A or channel B.
• Local (LCL) or foreign (FGN)
• Master or slave.
It is the same for the F/D as it is for the A/P, except for the master/slave
relation when at least one A/P is engaged. If an A/P is engaged in CMD, it is
the master.
F/D Pitch and Roll ConF/D Names
Like the A/P, the F/D may be called one of these names:
• Channel A or channel B.
• Local (LCL) or foreign (FGN)
• Master or slave.
It is the same for the F/D as it is for the A/P, except for the master/slave
relation when at least one A/P is engaged. If an A/P is engaged in CMD, it is
the master.
这种故障一般发生在进近期间，原因应该就是由于无线电高度表差异导致两边FCC计算的F/D不一致，但是机组一般反映无线电高度表显示正常，由于无线电高度表与FCC使用单独的线连接，波音一直认为是无线电高度表至FCC的线路问题，但是每次复位无线电高度表收发机保险能正常，个人觉得与其说是线路问题还不如说是收发机内部总线发送器锁死导致，目前想核实一下，在发生这种故障后，拔保险之前，看看FCC传感器里LRRA的数据怎么样

wanghao1123 · 发表于 2016-1-5 12:29:01

学习了

niftycarl · 发表于 2016-2-25 02:40:08

Crustal right now...

lichun-007 · 发表于 2016-6-14 14:05:41

khe_2006 发表于 2016-1-5 10:37
F/D Comparator
The flight director comparator operates during these conditions:
• Takeoff mode and ...

想请教个问题，当选用FMC1时，机长侧PFD上的白色LNAV指示在接通LNAV电门后闪烁，副驾正常。在选用FMC2时，机长和副驾PFD上的LNAV指示都为带方框的绿色，这是啥情况？

dengkui · 发表于 2016-6-14 15:09:58

建议下载QAR数据分析无线电高度变化情况，以此判定是否出现不一致大误差导致故障。

hw1128 · 发表于 2016-6-17 13:43:28

下载QAR数据可以准确分析故障原因，但现在解码软件升级后对无线电系统的监控数据缺少了很多，所以基本都不用了。

强 · 发表于 2016-6-18 13:11:12

学习新知识了，谢谢！

zxliu2007 · 发表于 2016-7-28 14:50:44

In each FCC, this monitor compares local pitch and roll F/D commands with the
corresponding cross-channel F/D commands. The local F/D only is BOV if
the difference exceeds a given value.
有谁知道他们都比较哪些参数啊？

tomro · 发表于 2016-7-28 23:12:08

太长知识了！RA的差异！！

khe_2006 · 发表于 2017-7-17 13:25:33

lichun-007 发表于 2016-6-14 14:05
想请教个问题，当选用FMC1时，机长侧PFD上的白色LNAV指示在接通LNAV电门后闪烁，副驾正常。在选用FMC2时 ...

你这是什么机型？在地面的时候NG飞机自动驾驶接通不了LNAV方式，且LNAV方式不会有白色显示，因为LNAV不需要预位

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[22自动飞行] 进近阶段右侧飞行指引消失，为什么总是右侧？

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中华航空