Pg 37-06 Step 5: Deburred the holes. Will prime the Flange after excess tank sealant is removed. Removed the rag and cleaned the chips. Step 8: Riveted the Top Tank Skin to the Fuel Tank Assembly. Riveted the Flange to the Fuel Tank Assy. Installed the Fuel Return Line to the AN 832-4D Bulkhead Fitting.