09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
145
RIGGING AND PREPARATION FOR FLIGHT
AILERON AND FLAP RIGGING
1.
Install wing tips.
2.
The aileron and flap push-pull tubes should be installed with jam nuts not tight
and NO Loctite on either of the rod end or jam nut. If Loctite is present it may not
allow the rod ends to rotate into position and provide friction free control
movement. Mark the push-pull tube so you can count rotations. Screw on the jam
nut and push-pull tube to rod end that has been already assembled to the aileron
and flap bellcrank 10 turns. Screw the other rod end into the push pull tube 10
turns. One full turn of either rod end or push-pull tube equals .10" at the very
trailing edge, use the wing tip for reference.
3.
Center control stick in neutral position (aileron neutral) and securely fix in this
position.
4.
Adjust the turnbuckles to minimize the tension in the cables.
5.
Insert a 1/4" bolt into each aileron bell crank rigging hole to hold it in the neutral
position.
6.
Temporarily bolt the rods ends to the ailerons to measure the gap on the
outboard side of the rod end for the bushing. Refer to the part manual drawing for
hardware and bushing material used. Cut the bushing material to 1/16" shorter
than the gap measured. This is to allow for the thick washer against the rod end
on the inside. Bevel one edge of the bushing to allow full movement of the rod
end. See
FIGURE 12A-03
.
7.
Adjust rod ends until the trailing edges match to the profile of the wing tip. One
turn of the rod end will move the trailing edge of the surface .10".
8.
With the rigging bolt still in place on the aileron bellcrank, adjust the turnbuckles
to set the tension on the aileron cables. With the bolt holding the bellcrank, the
tension will vary between the different lengths of cable. Adjust such that each
section has the appropriate tension.
NOTE:
Without a cable tension meter, adjusting the cables will have to be
an educated guess. The correct tens
ion does not overload or “drag” the
system, nor will cables feel spongy. If you have a cable tension meter
refer to
FIGURE 12A-03A
for tension information.
9.
Tighten all connections and turnbuckles. Re-check.
10.
Once satisfied with the aileron rigging, safety wire turnbuckles per FAA Advisory
Circular AC 43.13-1B section 7. RANS uses a single wrap method but, double
wrap methods may be used also. Refer to
FIGURE 12A-04
.
