Edge 540 Manual - Hangar 9

Section 9: Installing the Control HornsCONTINUEDStep 3. Locate the standard control horn. Trial fit the horn onthe elevator with the flat part towards the tip of the elevator andthe part that connects to the clevis being closer to the fuselage.Step 4. Line up the inside edge of the horn with the edge of theelevator and the mark you made in step 2. Make sure the horn iscentered on the wood frame of the elevator. Mark the screw holeswith a felt-tipped pen or pencil.Step 6. Carefully install the screws and engage the plastic plateon the other side. We suggest you cover the area with maskingtape around the horn to prevent damage to the covering if thescrewdriver slips. Once the right elevator control horn isinstalled, repeat the process for the left elevator.Step 7. Locate a standard and reverse control horn, fourscrews, and one plastic plate. The reverse “R” control horn isinstalled on the right side of the rudder (as if you were sitting inthe cockpit). The standard control horn will be mounted on theleft. These make up the rudder pull-pull control horns. They arelocated up from the bottom of the rudder along the edge of thered trim and the front edge is flush with the bevel. Mark thelocation with a felt-tipped pen or pencil. Trial fit one horn andmake sure the location does not interfere with the tail wheel wirethat was inserted into the rudder.Step 8. Once you are satisfied with the location, mark the screwholes with a felt-tipped pen or pencil.Step 5. Using a 1/16” drill bit, drill four holes for the horn.After the pilot holes are drilled, you can use the 3/32” bit tocomplete the process. After the holes are drilled, apply thin CAglue to the holes and area around the holes to help strengthenthe balsa of the elevator. Allow the CA to dry, then re-drill toclear any obstruction caused by the glue. Caution: The balsa issoft so be sure to use CA to strengthen the mounting of thecontrol horn.24