What puzzles me is that the static wicks are fine, the plane itself is "brand new" (10 years old
) and the #1 radio is fine.
I
can just about detect a little bit of crackle in the #1 radio, with the auto squelch off.
How can one check bonding, other than by inspection?
Also it has been very humid, which should play against static during flight - or maybe the opposite?
There is 0.5kg of silica gel in the cockpit the whole time, and it is hangared.
The other already mentioned thing is that the noise appears only when somebody is transmitting. There is no trace of it at other times.