Cleco'ed the top skin F-1278 to the F-1208, F-1209, and F-1210 Frames and to the F-1279-L & -R Upper Left and Upper Right Skins.
Cleco'ed and Riveted the F-12106 Fwd Skin Rib to the F-1278 Top Skin per Figure 2 reference page using 16 LP4-3 Rivets.
Cleco'ed and Riveted the F-1283C J-Stiffener, and F-00009-L & -R ADAHRS Brackets to the F-1278 Top Skin as shown in Figure 2 Detail A-A reference page using 33 LP4-3 Rivets.
Covered all open holes within 7 inches of the forward edge of the top skin. and Riveted all of the remaining, unmasked open holes in the Tailcone Assembly using LP4-3 Rivets as per figure 2 reference page.
