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corrosion in the center section

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22 Mar 2018 11:13 #1454 by Jack Arthur
Jack Arthur replied the topic: corrosion in the center section
It is my understanding that the inner granular corrosion comes from the spars not being correctly heat treated when they were manufactured in the 40's. Apparently there was some that were not treated correctly and got installed in planes. There is no logic to what planes they were installed in just a crap shoot. Just my two cents worth.
Jack

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22 Mar 2018 08:42 #1453 by Lowell Sterchi
Lowell Sterchi replied the topic: corrosion in the center section
I have a 415-D, made in June 1946. Most of its life in the North West then to GA. from
KY. I bought the kit from Univair for the inspection to cover the AD note, also the drain
kit. The AD note tells you three (3) ways to comply with the AD. Sigh off like C/W
does not comply with the AD. You have to say...C/W by method 1, 2 or 3. No other
sigh off is approved! Lucky, I had no corrosion, but was in need of some corrosion
protection. If you see your IA, ask him or her how they complied with an AD...that
will tell you something! I see so many sigh off's just C/W. I guess I'm from the old
school.

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20 Mar 2018 15:57 #1448 by Arnie Schweer
Arnie Schweer created the topic: corrosion in the center section
I have had 2 different IA s warn me about possible corrosion in wing center sections. I also have read the pre-inspection guide by Ed Birkhead. I have found a 415d here in central California with metal wings that has been kept here and hangared alongside the owners other King Air and 2 Bonanzas for the last 30 years. I am getting ready to make an offer on the plane but am wondering what the percentage of coupes in dry climates is that would possibly have this problem. Apparently there can be undetectable corrosion in the center section even with the 16 inspection holes in the wing bottom??? Any advice would be appreciated, is this something to really be concerned about given the location of the plane. It never gets wet, never sits outside..Thanks

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