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Completed steps 1-3 and 4-9 page 21iS?U-19
Step 1: Separated F-1275A, B, C, D, E, and F-01275F-1 Fuselage Corner Skins along the center perforations.
Step 2: Dimpled #40 the nutplate attach holes in F-01275F-L-1 & -R-1 Fuselage Corner Skins per Figure 2. Dimpled #30 the rivet holes per the call-outs.
Step 3: Riveted the called out nutplates to F-01275F-L-1 & -R-1 as shown
Step 4: Turned the fuselage upside-down. Clecoed F-01275F-R-1 to F-1253-R, F-01215-R-1, and F-1204P-R per Figure 3. Then one after the other clecoed in place F-1275E-R, D-R, C-R, B-R, & A-R as shown
Step 5: Riveedt F-1275A-R, B-R, C-R, D-R, E-R, & F-01275F-R-1 to each other per the call-outs. Riveted F-1275A-R to F-1203B-R and riveted F-01275F-R-1 to F-1204P-R (except for the four holes indicated). DID NOT rivet the fuselage corner skins to F-1253-R or to F-01215-R-1.
Step 6: Repeated Steps 4 and 5 for the left side of the fuselage.
Step 7: Clecoed F-1274-R to F-01202F-1, F-01212-R-1, and F-1275A-R per Figure 4.
Step 8: Except for the holes inside the region formed by the dashed line as shown in Figure 4, riveted F-1274-R to F-1275A-R. DID NOT rivet F-1274-R to the F-01212-R-1 per the call-outs.
Step 9: Repeated Steps 7 and 8 for the left side of the fuselage.

Completed steps 1-6 page 21iS/U-20
Step 1: Separated F-00020 by removing the hatched areas shown in Figure 1.
Step 2: Final-Drilled #30 the four #40 holes.
Step 3: Dimpled #30 F-00020 for the dimpled F-01276-1 Bottom Skin.
Step 4: Separated F-1204Z by removing the hatched areas shown in Figure 2.

Step 5: Oriented F-1268 as shown then marked each part. Separatef by removing the hatched areas shown in Figure 3.
Step 6 (iS): Go to the next page 21iS/U-21

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