Empennage Attach

July 22,2004

 

Page 11-2

Next step is installing rod end bearings. I got this little tool from Avery. It allows you to fit it over the end of the bearing and turn it without damaging the bearing. Works great.

 

Step 1:  Install MD3614M Rod End Bearings and AN316-6 Jam Nuts into both elevators as shown in Figure 1. Tighten jam nuts after achieving the rod end bearing engagement called for in Figure 1. Detail A

Step 2:  Attach the horizontal stabilizer to the workbench using four "drywall" type screws as shown in Figure 12. Position the stabilizer on the workbench such that the tips hang over the edges of the workbench.

Step 3: Temporarily install the left elevator to the horizontal stabilizer as shown in Figure 3. Elevator attach hardware is shown in Figure 3, Detail A. Not filling the gap between the elevator horn and the VA-146 with washers and then tightening the bolt to remove the gap may cause slight binding in the rod end bearings.

Perform an initial check to se that the elevator rotates freely and with no interference. If the elevator's leading edge rubs against the horizontal stabilizer gently "message" the leading edge to provide clearance. Should additional clearance be required, the elevator rod end bearings may be adjusted out up to 1/16 inch further than the dimension in Figure 1, Detail A. There should be 1/8 inch gap between the outboard edge of the horizontal stabilizer and the inboard edge of the elevator counterbalance arm.

Final check for 30 degrees "UP" elevator travel and 25 degrees "Down" elevator travel as shown in figure 4. Elevator travel is best measured using a protractor or and electronic "smart level"

Page 11-3
 

Step 1:  Locate the steel E-Drill Bushing provided in the kit and shown in Figure 1 below. The drill will be used to protect the hinge bearing from the drill bit when match-drilling the elevator horns to the inboard elevator hinge point

Step 2:  Insert the E-Drill Bushing into the VA-146 Elevator Center Bearing as shown in Figure 2. Match Drill #17 the WD-605-L-1 Left Elevator Horn using the E-Drill Bushing as a drill guide.

Step 3: Remove the left elevator from the horizontal stabilizer. Final drill the hole in the WD-605-L-1 Elevator Horn to 1/4 inch and deburr the hole.

Step 4: Repeat Page 11-2, Step s 3 and 4 and Steps 1 through 3 for the right elevator.

Step 5: Install both right and left elevators to the horizontal stabilizer. See Page 11-2, Figure 3 for the hardware call-out. Secure both elevators in the "trail" position by placing strips of duct tape over the gap between the elevator counterbalance arm and the horizontal stabilizer

Step 6: With both elevators in the "trail" position there will most likely be a mismatch in position between the bottom end of the WD-605-L-1 Elevator Horn and the bottom end of the WD-605-R-1 Elevator Horn, Identify which of the two elevator horns is the most aft.

Step 7:  In the most aft WD-605-1 Elevator Horn, locate and drill a 3/16 inch hole as shown in Figure 3.

 
Step 8: Measure the span wise distance between the WD-605-L-1 and WD-650-R-1 Elevator Horns.
 

Step 9:  Make or otherwise acquire a block of wood/plastic/metal that is the same thickness or up to 1/32 inch less than the distance measured in Step 8. The block should be 3/4 to 1 1/4 inch wide and 2 to 3 inches long. This Drill Guide Block will be used to keep the bit perpendicular when drilling from one elevator horn to the other. A stack up of blocks is acceptable if a single block the correct thickness is not available. Use a drill press to drill a 3/16 inch diameter hole in the block(s) 1/2 inch from one end. The hole must be perpendicular to the drill guide block.

 

Step 10: Insert a 3/16th bolt through the hole drilled per Step 7 in the WD-605-1 Elevator Horn. Place the Drill Guide Block against the elevator horn with the bolt passing through the hole drilled per Step 9. Clamp both elevator horns together with the drill guide block between them then double check that both elevators are aligned in trail.

 

Step 11:  Remove the 3/16 bolt from the WD-605-1 Elevator Horn and Drill Guide Block. Match-Drill #12 a hole in the elevator horn using the elevator horn and drill guide block to aid alignment. Drill the hole as straight and square as humanly possible.

 

Step 12:  Remove the clamp and Drill Guide Block from the WD-605-1 Elevator Horns and then remove the elevators from the horizontal stabilizer. Reinstall the elevator attach hardware finger tight in the horizontal stabilizer hinge brackets so that it won't get lost. Deburr the holes in the elevator horns and set elevators aside. Note I put the stab in place try to figure out how to work on it. I acquired this old adjustable height table from a War Surplus store and rebuilt it. It appears to be just the ticket as it rolls around with the tailcone on top very easily and I can adjust the height to the level I need.

 
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