CPL－920D耦合器故障探讨

nwz · 发表于 2019-1-28 22:52:54

一、近段发现安装有双HF系统飞机，总是有PFR：HFX CPLR（4RE1）/FEEDER(6RE1)/ANTENNA(5RE) 。信息，因为这个故程序需要对天线馈线对地电阻的测量，需要拆除垂尾前缘盖板，对航线的影响很大，但是真实原因并不一定就是馈线的问题。（我们发现是两套系统的相互抵制或叫干扰的问题）。以下是Rockwell Collins的分析，但我并没有找到相关的SB。请求帮助。

二、还有一个题是，耦合器安装座上分了四个部分，但是其实质上这些都是接地的，为什么要这样做，是怎么耦合到天线（能量从耦合器经安装座经馈线到达HF天线），求指点。

三、有兴趣可以一起探讨一下，手头还有部分相关文件。

The HF communication system consists of transceivers and antenna couplers, with a single HF antenna. All of these units must work together for proper operation of the system.

Following deeper Rockwell Collins analysis, it was found that relays (A2K36) were the main root cause of observed symptoms. Moreover, different causes varying from one a/c type to another one could lead to intermittent A2K26 failures.

The relays are a mechanical part and all relay contacts will deteriorate over time as the relays open and close. It was found that the relays were subjected to extensive levels of testing which caused hot switching. The definition of hot switching is when a voltage is present on the relay contacts when the contacts are opened. The voltage will arc between the contacts as the mating contacts separate from each other. Over time this arcing will cause the contacts to pit and eventually the relay will fail. The testing at Rockwell Collins and the Vendor have been modified to eliminate the hot switching.

A318/A319/A320/A321/A330/A340:
- P/N 822-0987-003
- S/N effectivity / Cut-in serial number: 202842

tengliang · 发表于 2019-1-29 09:08:36

先看耦合器，那个量电阻无非就是看阻抗是否匹配。新飞机没啥意义而且空客装配的不错。

nwz · 发表于 2019-1-30 22:52:39

tengliang 发表于 2019-1-29 09:08
先看耦合器，那个量电阻无非就是看阻抗是否匹配。新飞机没啥意义而且空客装配的不错。
...

最后发现是特定的两个匹配造成的问题，但是没有更好的理论依据来说明这个问题

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[23通信] CPL－920D耦合器故障探讨

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