09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
47
SKIN INSTALLATION
1.
Remove the bend tags from the skins as shown in
FIGURE 04-01.
2.
Cleco and rivet the inspection tab rings to the inside of the skins.
3.
Place the skins on a couple of 2X4 or 4X4. Place the frame assembly on the
skins and cleco (#40 Silver) the skins to the top of the frame assembly. Please
note that the spar is drilled to #40 and the skins are drilled to #30. This allows
slight movement of the skin to allow easier alignment until drilled to final size.
NOTE:
The skins are the only part which determines the top and bottom
orientation of the horizontal. As such, orientation doesn't matter until the
horizontal is attached to the tailcone or elevator.
4.
Roll the assembly over to cleco the other side. Place the side with the un-drilled
spar flanges up.
5.
Check the assembly for twist and fixture/weight as necessary to remove any
twist. Transfer drill #30 from the skin to the spars.
6.
Remove the skins and de-burr the transfer drilled holes.
7.
The center section of the horizontal stabilizer is cut out to allow it to fit over the
fuselage. The rivets in the area are flush to allow the fairing to fit flat on the skin.
Dimple the rivet holes in the skin and ribs in this location, and counter sink the
corresponding holes on the spars.
8.
Re-assemble the skins and check alignment.
9.
Rivet one side.
10.
Flip the assembly over. Check again for twist before riveting.
11.
Trim the Horizontal Tip to fit inside of leading edge skin.
NOTE:
You may want to wait for final trimming and attachment until after
the elevator has been fit to Horizontal Stabilizer. Tips should be flush with
outer ends of elevator and have about 1/8” clearance between the
horizontal tip and the elevator balance weights.
12.
With the tip in place, push the tip forward into the leading edge of the horizontal
skin to ensure the tip conforms to the leading edge shape. Transfer drill the holes
into the tip while holding this pressure.
13.
Glue the brass washers in place to retain them for assembly.
14.
Attach the tip and install rivets for final assembly.