Service Bulletin SB 14-01-31 Work

Time: 6 Hours

The FedEx guy showed up at lunch time just as I got home from running my errands this morning. Since the SB parts are here so I jumped in the Hangar to finish up the work.

20140614-173917-63557081.jpgFirst task was to cut the angle off the end of the forward spar flanges. After thinking about it overnight I decided to remove 8 more rivets along the forward spar and skin joint. I also removed 13 rivets along the rear spar on the top and bottom. What this did was allow me to lift the skin away from the cut area and get a file and sandpaper along the cut. It wasn’t perfect but it worked.

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20140614-174243-63763759.jpgI then used a plastic pry bar to lift the spar from the skin to make the cut with my Dremal.

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20140614-174354-63834903.jpgThe next task was to cut off the forward flange of the main inboard ribs.

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20140614-174602-63962767.jpgThe plans call for 4 holes to be drilled in the rib web, I measured per the plans and drilled them on the drill press.

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20140614-174738-64058709.jpgI grabbed the new spar doublers and separated them on the band saw. All the edges were then deburred and the machining marks were removed and smoothed over.

20140614-174933-64173472.jpgThere is a top and bottom of the doublers where the top is depicted by 1 offset rivet hole. I used all the other holes to make a straight line on the top and bottom of the fingers that extend off the doubler.

20140614-175114-64274100.jpgI also drew a line down the of the holes on the spar that will correspond to the ones on the fingers of the doubler. When I clamped the doublers to the spar by lining up the bends in the spar I also lined up the two lines I drew.

20140614-175358-64438576.jpgWith the doublers clamped in their place I started drilling and cleckoing the 8 holes that the plans call out. I then checko’ed the two support angles that were on the spar originally and match drilled every hole. As I drilled 1 I would clecko and move to the next. There were several holes that get drilled from the doubler side and several that get drilled from the angle side.

20140614-175635-64595192.jpgI deburred every hole and scuffed the new doublers as well as the existing angles for priming.

20140614-175757-64677889.jpgI also taped off the horizontal stab so that I could touch up the primer from where I scratched it during this process.

20140614-180708-65228484.jpgTomorrow I will get to rivet the doublers in place, I need to borrow a double offset rivet set from Glen as it’s pretty tight inside the skin for riveting the doubler, another good day in the Hangar.

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