为什么737NG VHF天线前缘容易出现小缺口？

ryn_82 · 发表于 2020-11-4 09:41:45

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在之前的文章中：

737NG飞机甚高频天线掉漆和损伤标准

为什么737NG VHF天线前缘容易出现小缺口？-1.jpg

提到了VHF天线前缘容易出现小缺口的问题，这种现象其实在737NG机队是很常见的。

图 | VHF天线前缘出现小缺口

缺口处看着并不像是天线本体损坏，而是设计上就是这样的，然后用东西填充。

到底是什么原因导致的，现有资料无法找到答案，为此咨询了一下波音：

问

We noticed such a phenomenon on our B737NGs, after the paint on some of the ref/A/ VHF communication blade antenna leading edge is removed by high velocity wind and rain during flight, the aluminum base is exposed, you will see a gap. It seems that the gap is not a damage, not caused by erosion or FOD, it is designed so and filled with filler/putty. we gathered some pictures of the eroded antennas, please see ref/B/ through /F/ for reference, We reviewed ref/B/ CMM and didn't find any clues about that. At some time, this phenomenon may cause operation interruption.

Please Boeing coordinate the antenna manufacturer and explain the phenomenon for us.

REFERENCES:

/A/ DMC50-17 VHF ANTENNA

/B/ CMM 23-10-03, DM C50 SERIES BLADE ANTENNA

Boeing has received an explanation from L3 Harris. The leading edge of the antenna is metal, except for the region in question. In this area, epoxy filler is used between the top of the metal leading edge and the cast spar. As the antenna is exposed to runway debris, the epoxy fill area is more susceptible to damage than the aluminum. This is what causes the gap.

（Service Request ID: 4-4909175444）

答