I am a A.net newbie and this is my first question. Please be gentle!
767s when listening to Ch. 9, there is often a very loud
background hum (possibly 400Hz interference(?)).
The hum is only present when the source is the aircraft radios (i.e.,
it is not present during a PA override announcements on Ch. 9).
I have also only heard this on 767s and am convinced it is an
not just a specific airframe.
Anyone have any explanations ? Unshielded cables between the
radios and IFE ?
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