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In a message dated 2/5/02 12:12:32 AM Eastern Standard Time, Rob Wolfe  writes:
The Lancair 320 manual calls for hard rivets (AN426AD-3-6) to be used to secure nutplates for the flap hinges.  Can I use soft rivets (AN426A-3-6)?


      Rob, I read your question and rationale for using soft rivets to hold the nutplates and agree with your logic. In watching a fellow RV builder install nut plates in his wing and tail fairings (fiberglass), he damaged the thin material by using the hard rivets that were provided as "standard" in his kit. I gave him a few soft rivets with essentially your rationale. They worked much better, easier, and neater. Function just fine. If you are
fastening the nut plates to aluminum hinge, I'd think either the hard or soft rivets would work. I'd be very careful about using soft rivets in metal where  there is any kind of shear structural load as you note, but for nutplates,
this load is small and only occurs when tightening/loosening the associated  screw/bolt......Bob Pastusek

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