mohawk wrote:
Hi,

Have some aviation experience, 20 years AME with structures. What is
your question? If I don't know I bet I Know someone who does.

Mark

mhorowit wrote:
I have a question for a DER who specializes in aircraft structural.
It's a welding question.
Anyone on line? - Mike

Great - thanks for the offer. I"m looking at Figure 4-36 in 43-13-1B
"Welded patch repair".
I'm wondering if it would be acceptable to modify the patch so that
instead of that approx. 30 degree downward slope, the edge went 90
degrees down so that the patch wrapped around like it does for a
extenal splice on a strut. In this case it would wrap around 270
degrees. I'm thinking the length of the welds would be about the same.
Wondering what engineering concerns would make this unacceptable. This
is for the leading edge of my rudder, which has a rust hole in the 4130
steel. The reason I'm looking at a deviation from figure 4-36 is that
if I follow the illustration, the edge will just cover a bolt hole, and
if I redrill the hole, I'll be drilling thru a weld, thereby weakening
it. - Mike



Reason