----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----HI Jan and All,Thanx for all the info about the Hi Lock and the Jo-Bolt. The only thought that I had as I read about the technique of install behind the tank area from the front will there be enough clearance to put the tanks back in place just my thinking Dennis 99564 hey I'm hoping my rivits are OK
"[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote:
----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----After talking to several people online it seems a big concern is IF a bad rivet is found, how hard will it be to replace. Standard rivet gun and bucking bar methods will be difficult with the airplane assembled, and a hydraulic press setup will not fit either. I made a couple of phone calls today- the first to my friend the FAA inspector who was on the scene of the original crash. We discussed allowable alternate fasteners; AC43.13 allows a direct replacement of a standard solid shank rivet with any one of several "mechanical lock" fasteners. My next talk was with the lead sheetmetal tech here at the airline I work for. We discussed which type and he showed me 2 that would be excellent. One is a Hi-lock, the other is called a JO-bolt. The Hi-lock is installed by drilling the hole to size, then reaming for a close tolerance fit; so there's no need for hole filling. Then the Hi-lock has a collar that is attached with a 1/4 inch drive ratchet tool that cranks the locking collar down onto the shank and it snaps off when it reaches it's proper grip.Done! and as good as any solid shank rivet and with no bucking; any A&P (or monkey) with the right tool can do it. The Jo-bolt is not actually a bolt. It also is a mechanical locking fastener that has a collar as well. There is a special tool adapter required for the jobolt to crank the collar down onto it; and it also snaps off the extra collar tail when it's tight. The Jo-bolt is different from the hi-lock in that the jo-bolt actually expands inside the hole, so there's no reaming with the jo-bolt. But you do have to have the special tool to crank it down. Now the best news- the rivet "shop head" does not have to be inside the wing, which means that these fasteners can be installed from the front, with just the gas tanks removed- the only thing you have to reach inside the wing to do is to initially install the fastener and push it through. Then the collar can attach from the front, outside where it's easy to get to.Jan ZanuttoFresno CA
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