Great Planes Giant Citabria 30cc/EP ARF - GPMA1435 - Manual (Page 7)

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7. Install the servo cover to the wing securing them to
the wing with four #2 x 3/8" [9.5mm] screws and four #2 flat
washers.
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8. Tape the servo lead to the top of the wing to prevent
the leads from falling back into the wing.
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9. Located in both the aileron and the flap is a plywood
mounting plate. If you look at the control surface at a slight
angle you will be able to see the plate through the covering.
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10. Place a black nylon control horn onto the plywood
mounting plate in the aileron in line with the servo arm.
Drill a 3/32" [2.4mm] hole through each of the holes in the
control horn. Drill only through the plywood plate. Do not
drill through the top of the control surface. Mount the horn
with four #4 x 3/8" [10mm] screws.
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11. Each aileron and flap pushrod are made from a
5-3/4" [146mm] 4-40 pushrod wire threaded on one end, a
threaded metal clevis, a 4-40 nut, a metal solder clevis and
two silicone clevis keepers.
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12. Screw the 4-40 nut and the threaded metal clevis
onto the pushrod wire. Attach the clevis to the second hole
down on the control horn. Attach the metal solder clevis into
the outer hole of the aileron servo arm. Center the aileron
servo arm and the aileron. Mark on the pushrod wire where
to cut the wire. Remove all of the pushrod wire components.
Solder the metal solder clevis to the pushrod. If you are not
familiar with soldering, read the Expert Tip that follows.