RANS S-20 RAVEN
TEXT MANUAL
09
/01/2013
01C-02
INSTALLATION OF HORIZONTAL STABILIZERS
(AFTER COVERING AND PAINT OF HORIZONTAL STABILIZER)
11.
Use a hot iron to burn holes through the fabric at the attach points for the
tail bracing, the elevator hinges, the drain holes and the seaplane
grommet at the right horizontal stabilizer.
12.
Modify 14 attach tangs as per
FIGURE 01C-12
. Use the 1:1 drawings to
layout the bends. The dimensions are not that critical. Nevertheless, still
try to be close. The radius is important. We suggest the use of a block with
a radius. Clamp block and tang in a vise. Use a light hammer to form the
tang. Take precautions against tooling marks. Mark tangs for identification.
13.
Bolt the tangs to the corresponding position on vertical stabilizer,
horizontal stabilizer and fuselage. Refer to
FIGURE 01C-13
. Do not forget
the washers.
14.
The tail brace rods are made from stainless steel rod and are reduced in
diameter toward the threaded ends. The transition area should extend
over approximate 1” to 1.5” and must be smooth. If this area is
NOT
smooth then modify the tail brace rods as shown in
FIGURE 01C-14.
The
setup in
FIGURE 01C-14
makes the task of filing and polishing easy and
quick. When clamping the rod in the drill, use some plastic or tape around
the end to protect the treads. Use a fine file first and polish afterwards
using Scotch-Brite or fine wet dry paper. Do not worry the rods are plenty
strong.
15.
Install the aluminum bushings into the stabilizer attach bushings on the
fuselage top longerons. See
FIGURE 01C-15
.
16.
Attach the Horizontal Stabilizer to the fuselage using the hardware shown
in the parts manual. It may be necessary to hold the stabilizer in a vertical
position to obtain better hole alignment. Install cotter pins.
17.
Support the stabilizer in horizontal position. Attach jam nuts and tie rod
ends to tail brace rods. Refer to
FIGURE 01C-17
.
IMPORTANT:
The tail
brace rods have on one end LH and on the other end RH threads. There
are also tie rod ends with LH and RH threads. Assemble accordingly.
18.
The LH and RH threads will make tension adjustment possible without
disassembly. Turn rods all the way into the rod ends. That will assure
even thread engagement at both ends when the rods are turned for final
tension adjustment.
IMPORTANT: For rod tension or length adjustment
always turn the rod and keep both ends fixed. That will assure even thread
engagement on both sides.
19.
Attach the pre-assembled rods with clevis pins and cotter pins in the
appropriate positions as per parts manual. Adjust the tension of the upper
rods so that the lower rods do not bend.
20.
For final adjustment, refer to
RIGGING
.
