View attachment 54977
Finished the cargo area floor. The hole is an access panel for elevator cable pulleys. It now has a CF cover plate. On the list for interior CF is the under seat storage bin, fuel selector cover plate, cargo and cockpit door sill cover, pulley covers and maybe the instrument panel. Rear seat back and bottom and the front seat bottom is already CF.
..... It’s become more of a lifestyle than a project.....
My opinion would be 'yes', if it's brazed to something structural. In the past I've been advised that it's ok to braze 1020 stuff like the bird cage, but not longerons, etc.Is a tab for a fuel drain considered structural?
43.13 sez don't braze to structure.
4-88. a. Page 4-59
a. Brazing requires less heat than welding and can be used to join metals that are damaged by high heat. However, because the strength of brazed joints is not as great as welded joints, brazing is not used for structural repairs on aircraft. In deciding whether brazing of a joint is justified, it should be remembered that a metal, which will be subjected to a sustained high temperature in use, should not be brazed.
I will suggest getting a piece of 4130 sheet and braze something to it. Look at the back side to see if you have any cracks. If they are there, they will be ugly and very visible. If you don’t get cracks, then go ahead and braze it.