nuckolls.bob(at)aeroelect
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 Posted: Sun Mar 09, 2014 8:55 am Post subject: Fuselage as ground conductor |
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At 01:08 PM 2/8/2014, you wrote:
| Quote: | Good Afternoon Bob,
Obviously, I am getting into this a bit late, but what about airplanes like the newer Bonanzas where all skins and stringers were painted prior to assembly? No doubt that the rivets when driven would spread to contact each joined skin, but would that be sufficient area to carry the current? |
Good question . . . and it depends. A properly
bucked rivet swells to completely fill the holes
in a sheet. It seems unlikely that insulating
naterials would persist with enough contamination
to seriously degrade the conductivity . . . besides,
there are so many!
But things can happen. For example, I saw a
King Air out at Mid Continent getting
pressurization checks after some major refurb
including a paint job. Seems that the
chemical stripper used to prepare the airplane
for paint etched metal away under the rivet heads.
During pressurization checks, thousands of rivets
were found to 'bubble' when soaped.
This would place the conductivity of the airframe
in doubt as well. If stuff got in and ate material
away, then 'gas tightness' is lost.
I don't think the new assembly methods necessarily
degrade rivet conductivity but for sure, environmental
stresses (and over zealous painters) might offer
an alternative reality in time.
Bob . . . [quote][b]
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