In article ,
" jls" wrote:

"Nathan Young" wrote in message
...
On 15 Jan 2005 14:24:53 -0800, "ChrisH" wrote:

My A&P has dignosed this condition on my 1964 (Piper)PA28-140. Has
anyone dealt with this? Can the wings be repaired or rebuilt? Is there
a good source for spare wings? I'm in North Carolina.
Thanks,

What does intergrandular corrosion mean? Sounds like a medical
condition.

You should check with Wentworth Aircraft on spare wings. I have also
seen them on eBay.

-Nathan


It's some pretty bad stuff. But it's 'intergranular.' No 'd' in it if
you want to google and read about it, it means that the corrosion involves
the grain boundaries of the aluminum alloy.


In worst case, you can crumble the aluminum with your bare fingers. The
most prone alloys are 7075 and (non-clad) 2024, due to their high
magnesium content. Moisture is the big enemy here, as it promouet
surface corrosion, which then attacks the grain structure of the
aluminum alloy.

The only solution is to replace the offending part.