This question is related to the answer I found on this particular thread, about the Frames in a Turbofan.
I went on this thread after some research on Google, since recently I started working in the industry. I'm working on this particular part of the frame, and I would like to understand more about it. Also I am currently working on understanding more about jet engines in general and how they work, I find this absolutly fascinating since I found a lot of information and answers to my questions - and now for the curiosity :)
My question is about the Fan Frame here (GE CF6/CFM56 Turbofan on pics)
I would like to know the use of the 12 Circular Holes on the inside of the frame, between the 2 flows (Low-pressure compressor way, Right?), you can see here what i'm talking about on those pictures (Red arrows).
(I don't think this is to make the part lighter, because the outside edges of thoses holes, are re-inforced a lot with a big extra thickness.)