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Well, I guess im in trouble, I have sprayed corrosion X all through the
airframe, primarily the center section and spar area. Are you saying it
needs to be washed off the rivets with a cleaner for proper testing? Dick L.
3041H
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, March 20, 2006 7:09 AM
Subject: [COUPERS-TECH]
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HERE'S A COPY OF THE EVAULATION OF SERVICE BULLETIN 32 FROM MY A&P. NO BAD
RIVETS WERE FOUND.
TONY
N94670
BOGGS AVIATION
EVAULATION OF SERVICE BULLETIN 32
The following information is from my personal evaluation of SB 32. It is
my opinion and should be taken as such. This is not regulatory information
and all findings are to this specific aircraft, you may or may not find
the same with your aircraft. With that, here is the information I have.
The inspection was carried out by a level III qualified NDT technician.
Make sure your technician has several thousand hours in this type NDT due
to the difficulty in the interpolation of the graphs. Small errors in the
reflection could mean unnecessarily removing good rivets. A good
technician will also be able to work through the differences in rivet
length, diameter and small imperfections in the bucked end of the rivet,
which could cause variations in the reflection. As a side note, make sure
your technician has skinny arms. Getting into the access holes is very
difficult.
Next point is that the wings MUST be removed. This inspection is too
difficult to ACCURATELY read each and every rivet with just going through
the openings of Service Bulletin 31. Especially due to the location of
some rivets in relation to the ribs. Most importantly is that the first
two rivets, one on each side, in Area "E" of the SB are countersunk and
installed backwards due to the landing gear brackets. This alone forces
you to remove the wings to get to the bucked end of the rivet.
Removals of the fuel tanks are not necessary unless you have a problem in
the stub wing area. Removal if the interior is needed, and especially the
side panels. You can get to the inboard bay of the stub wings through the
side panel that makes life a lot easier. Remove the seat pan and you are
set to start the inspection.
Just remember to work slow and accurately. Double check what you think may
be a bad rivet and make sure your transducer end is not chocked sideways
or the rivet is not bucked crooked. Also make sure the rivet ends do not
have pits or corrosion X sprayed on them. Also make sure that the
technician does not use too much coupling in the rivet to cause a false
reading. Not enough coupling and you will not get a reflection. Good luck
Boggs Aviation
Daniel P. Boggs
A&P
IA
Private Pilot
[EMAIL PROTECTED]
920-858-7053 Cell
920-982-6849
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