Posted: 4/5/2011 19:49:48
I need to repair some cracks on my project and the manufacturer used 2117 rivets. can anyone provide me with direction as to what type aluminum that used and what I can use to make the needed repairs? The area that I'm making the repair is 0.20 thick sheet and is non-structual. This is a Hughes TH-55A helicopter.
Posted: 4/7/2011 20:58:52
Almost all aircraft alum is 2024 T3 or T6 alcad (a thin layer of pure Al for corrosion protection).
Think U meant .020 vs .20. The aircraft wouldn't fly with .20 (nearly 1/4" .250)
Contact Hansen Rivet Supply. They have every type of AC rivets.
Posted: 4/8/2011 08:40:28
Thanks for the information on aluminum and the rivet resource. I certainly need to watch where I put the decimel points if I ever want this to get off the ground.
Posted: 4/8/2011 16:29:07
Before you make the repair, consider this. First, what caused the needed repair? If it was wear & tear or vibration related (it IS a helicopter) maybe what was on there wasn't adequate. Sometimes non-structural parts are "spec'ed" with whatever is laying around & that is often what some call "aircraft aluminum." What they really mean is structural, tempered aluminum, they is no such designation as "aircraft aluminum." Strained hardened series such as 3003H14 or 5052H32 is often a much better choice in non-structural areas, as they are much more easily shaped & more crack resistant. Tempered aluminum has a higher tensile strength per pound, but toughness is sometimes a better trait, however, & upsizing to .032 might make the part last longer if the part is not so large as to cause a weight issue.
Posted: 4/12/2011 16:56:44
Thanks for the information. I've been reading up on aluminum and I certainly understand what your saying. I'm replacing a couple of patches that were made to areas where the controls entered the cabin (edge of control boot) that are showing corrosion and to the floor board where the PTT foot switch cracked through. This was originaly a primary trainer and I'm sure it suffered through some rough use and quite a few "touch-down" autorotations and of course an Instructors big boot mashing the PTT.
Thanks for your advise!