Trio Avionics Wing Servo Mount Installation for RV-7, 8, 9 and 10 - Manual (Page 3)

Step 5:
Step 3:
Removing Aileron Bell Crank
The #11 hole is drilled 1.00” below the existing push rod attachment hole (the pushrod that
goes to the control stick). Debur the hole when you’re done. (See above photo)
Step 4:
Remove the bell crank from
the factory mounting tabs.
There is no need to remove
the bronze bushing from inside
the bell crank.
Mark and drill a #11 hole
(centered) in the bell crank to
attach the small push rod from
the servo.
1.00”
Drilled by Builder
Remove the aileron bell crank inspection panel from the right wing. Disconnect the two
push rods from the bell crank. Make note of the hardware so you can reinstall it in
accordance with the manufacturer’s specifications.
Mark the bell crank with a pen, noting which side faces down (as oriented while in the
aircraft) so it will be installed in the new bracket with the proper orientation.
Remove the four AN3 bolts that mount the aileron bell crank. Remove the bell crank from
the wing and let’s go back to the bench!
Install the bell crank between the tabs of the Servo Mounting Bracket. (Remember the
knee brace is the bottom of the bracket. Make sure the bell crank is mounted in the same
orientation as before)
When installing the AN4 bolt that secures the bell crank, you may need to add a washer or
use a “thin” stop nut, supplied in the kit. (AN364-428A ; aka: MS21083N4 elastic stop nut)
Regardless, use a new elastic stop nut and make sure you have at least 1.5 threads
protruding from the elastic nut. (Standard practice to ensure the security of the fastener)
Torque the AN4 mounting bolts 50-70 in/lbs
, or to what Van’s specifies.