09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
88
16.
From inside the tail, drill and cleco through the S-4 bulkhead and the top skins
and top front skins. Ensure the bulkhead and top skin holes line up when drilling
the first couple holes.
17.
Repeat the process to fit up the other top front tailcone skin.
18.
Cleco the (5) top stringers in place on the top skin. Mark the location where the
stringers need to make a bend to follow the top front skin.
19.
Remove the stringers from the tailcone.
20.
Place the stringer on the edge of a table and carefully bend as needed. Go a little
bit at a time and don't overshoot the bend angle.
21.
Insert the stringer back into the tailcone and test fit. Remove and re-bend as
necessary.
22.
Use a straight edge to ensure the stringers are straight from S-3 to the aft section
of the tailcone. Transfer drill and cleco. Trim the stringers to the next hole in the
stringer closest the tube on the cage. The last rivet on the stringers should catch
the spacer strips.
23.
Line the center stringer up to the center of station 3 and clamp in place. Add a
little weight to the top seam of the top front skins to prevent pillowing. Clamp the
stringer in place. Straighten as needed.
24.
Transfer drill and cleco from the stringer to the 2 top front skins from inside the
tailcone.
25.
Position the stringers to the top front skin as shown in
FIGURE 07-08
.
26.
The tailcone top skin and top front skins are now ready to be riveted. Rivet the
top seam last after making a final check of tailcone alignment.
NOTE:
Spacer shims may be added between the bulkheads and the skins
to reduce the amount of pillowing. Use scraps of 6061.
27.
Install the spacer strips before final riveting. Trim if necessary to prevent
interference with the window.
