Hangar 9 Extra 300 X 120cc Manuel D'utilisation page 11

AILERON CONTROL HORN INSTALLATION
1. Sand the lower portion of the control horn where it fi ts
into the aileron using medium grit sandpaper.
2. Clean the oils and debris from the sanded area using a
paper towel and isopropyl alcohol.
3. Separate the control horns into two groups. The longer
horns are used toward the wing tip (A), and the shorter
horns toward the wing root (B).
4. Fit the shorter control horns into the slots in the aileron
near the wing root. Insert them so they are fl ush with the
surface of the aileron. Check that they do not protrude
from the top of the aileron. Sand the base of the control
horn if it does protrude and deform the top of the aileron.
5. Place low-tack tape on the aileron around the control
horns. This will keep the glue from getting on the aileron.
Removing the tape before the glue cures will leave a fi llet
between the control horn and aileron for a fi nished look.
Extra 300 X 120cc
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A
B
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6. Remove the control horns from the aileron. Apply a small
amount of 30-minute epoxy into each of the slots in the
aileron.
7. Apply a small amount of 30-minute epoxy to the base of
the control horn using a toothpick.
8. Insert the control horns back into the aileron. Slide a 4-40
x 3/8-inch socket head cap screw through the hole in
the control horn to make sure they are aligned with each
other.
9. Remove any excess epoxy using a paper towel and
isopropyl alcohol.
10. Remove the tape while the epoxy is still slightly pliable.
This will allow the epoxy to fl ow between the control horn
and aileron creating a small fi llet. Remove the screw from
the control horn after the epoxy has fully cured.
11. Repeat the previous steps to install the control horns
toward the wing tip.
12. Repeat this section to install the control horns in the
opposite aileron.
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EN