Brief Description: Riveting Front Spar Sub-Assembly
The front and rear spars were measured for the proper angle between the flange and spar web and adjusted with a hand seamer where necessary. Everything now lines up within a degree of the required value.
There is a problem with riveting the tip rib to the front spar. The spar flange holes will not line up properly with holes in the E-903 outboard tip rib. No amount of coaxing with the drift pin would allow an AD4 rivet to be inserted into the hole without damaging the bearing surface. I previously had a misalignment issue on these ribs with the holes C/T the E-913 counterbalance skin the the E-903 and E-904 ribs.
I've decided to oversize these holes with an AD5 which should clean up the misalignment. The problem is I don't have an AD5 rivet cup set or any AD5 rivets. I ordered them today, but it'll be a week before I can rivet these ribs together. I'll call the mothership to verify this is the correct solution.
I did call Van's today about removing primer before I bond the foam ribs in place. Van's suggested that I put some duct tape on the area where the ribs will rest and pull it back off. If the primer doesn't come off with the tape, then I'm good to go without further action. The sealant will stick to the primer without problem, but Van's concern is that if the primer itself is not bonded well to the metal, then the overall bond will fail.
Adjusted front and rear spar flange angles.
LHS inboard rib riveted to front spar.
Front spar to tip rib holes won't line up properly. O/S to AD5 is the cure.
