Step 1:  Run a #40 drill through all the 3/32 diameter fuel tank attach nutplate and wing attach nutplate rivet holes in the web of the W-SPAR ASSY-L Assembly-Left. See Figure 1.

Step 2:  Run a #30 drill through the three spar doubler to spar web rivet holes in the web of the W-SPAR ASSY-L Spar Assembly-Left. See figure 1

Step 3: Machine countersink the nutplate attach rivet holes in the web of the W-SPAR ASSY-L Spar Assembly-Left. Countersink just deep enough to fit the head of an AN426AD3 rivet. The countersinks for the fuel tank attach nutplate rivet holes are on the forward side of the spar assembly and the countersinks for the wing attach nutplate river holes are on the aft side of the spar assembly. See Figure 1.

Step 4: Machine countersink the aft side of the W-SPAR ASSY-L Spar Assembly-Left for the three AN426AD4 rivets shown in Figure 1.

Countersink just deep enough to fit the head of an AN426AD4 rivet. Install the three rivets as shown in Figure 1.

Step 5:  Rivet the fuel tank attach Nutplates and wing attach Nutplates to the W-SPAR ASSY-L Spar Assembly-Left as shown in Figure 1. (Note: I had to carefully use the back rivet set to gain enough access in the confined space close to the step bar. Be Careful to hold it tight if you use this method.)

Step 6:  Fabricate the 1020 Tie-Down Bracket from a piece of AEX TIE-DOWN by cutting to length, tapping, and drilling a pilot hole as shown in Figure 2.

Step 7:   Cleco the W-1020 Tie-Down Bracket to the W-SPAR ASSY-L Spar Assembly-Left as shown in Figure 3. The upper edge of the tie-down bracket rests against the bottom surface of the upper spar step-bar. Using a #30 bit, match drill holes in the tie down bracket using the pre-punched #30 holes in the spar assembly as drill guides. Insert clecos in the holes as they are drilled. Using a #12 bit, match-drill holes in the tie down bracket using the pre-punched 3/16 holes in the spar assembly as drill guides. See Figure 3.

Step 8: Remove the W-1020 Tie-Down Bracket from the W-SPAR ASSY-L Spar Assembly-Left. Using a #40 bit, match-drill the nutplate attach rivet holes in the W-1020 Tie Down Bracket as shown in Figure 4. Use the Nutplates as drill guides for properly locating the holes.

Step 9:  Machine countersink the aft side of the W-1020 Tie-Down Bracket for the heads of the nutplate attach rivets. See Figure 4. Deburr all holes in the tie-down bracket.

Step 10:  Prime the W-1020 Tie-Down Bracket. See Section 5A for more information on priming aluminum.

Step 11: Rivet the Nutplates to the W-1020 Tie-Down Bracket as shown in Figure 4.

Step 1:  Clean the powder coating from the insides of the holes in the W-823PP Aileron Bellcrank Brackets by running a #12 drill through the two smaller holes and a 1/4" drill through the single larger hole.

Attach the W-1020 Tie Down Bracket and two aileron bellcrank brackets to the W-SPAR ASSY-L Spar Assembly-Left as shown in Figure 1.

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