Section 28 Fwd Fuse Ribs

Section 28 Fwd Fuse Ribs, Bulkheads & Bottom Skin

Step 1: Remove the F-1004K-L & R Center Section Side Plates and F-1042-l & R Bulkhead Side Channels from the F-1043A-l & R Fwd Fuselage Bulkheads and F-1072 Fwd Fuse Bottom Skin.

Remove the F-1084A-l & R Systems Brackets from the fwd fuse bottom skin.

Step 2: Trim the bottom flanges of the F-1004K-L & R Center Section Side plates to match the elliptical holes in the F-1072 Fwd Fuse Bottom Skin.

Step 3: Cleco the aft flanges of the F-1048-L & R Fwd Fuselage Ribs to the web of the Fwd Center Section Bulkhead Assembly as shown in Figure 1.

Match-Drill #12 through the Fwd Center Section Bulkhead Assembly into the flanges of the fwd fuselage ribs 12 places as shown in Figure 1.

Final-Drill #30 through the Fwd Center Section Bulkhead Assembly and fwd fuselage ribs 12 places as shown in Figure 1.

Step 4: Uncleco the Fwd Center Section Bulkhead Assembly from the F-1048-L & R Fwd Fuselage Ribs. Deburr the holes in all parts that were drilled in the previous step.

Step 5: Attach the Center Section Bulkhead Assembly to the F-1048-L & R Forward Fuselage Ribs using bolts and clecos as shown in Figure 2.

Page 28-9

Step 1: Mate the mid Fuselage Assembly to the Forward Fuselage Assembly as shown in Figure 1. The F-1076 Center Bottom Skin (part of the Mid Fuselage Assembly) fits between the Fwd Center Section Bulkhead and the F-1072 Fwd Fuse Bottom Skin as shown in Figure 2. The picture of the assembly shows that the spacers are installed, so before sliding the two parts together I put the spacers together. Every thing lined up amazingly well. The bolts are quite tight (Close Tolerance so I used a rubber mallet to carefully drive them through the holes.

Spacers, Bolts, Nuts and Washers

Putting spacers on the bolts

Tighten up the bolts to bring spars together, then I pushed the skins back in place, the holes in the skin lined up very well

Cleco together the center bottom skin, Fwd Center Section Bulkhead Assembly, and fwd fuse bottom skin.

Cleco together the forward fuse bottom skin, center bottom skin, and Aft Center Bulkhead Assembly.

Cleco the F-1004K-L & R Center Section Side Plates to the Aft Center Section Bulkhead Assembly, Fwd Center Section Assembly, and fwd fuse bottom skin as shown in Figure 1.

Cleco the F-1084A-L & R Systems Brackets to the fwd fuse bottom skin and Fwd Center Section Bulkhead Assembly as shown in Figure 1.

Step 2: Final-Drill #40 the holes common to the F-1076 Center Bottom Skin, Fwd Center Section Bulkhead Assembly, and F-1072 Fwd Fuse Bottom Skin. Note that at four locations the aft tabs of the F-1084A-L & R will have been final-drilled.

Final-Drill #40 the holes common to the fwd fuse bottom skin, center bottom skin, and Aft Center Section Bulkhead Assembly.

Final-Drill #40 the holes common to the F-1004K-L & R Center Section Side Plate to the Aft Center Section Bulkhead Assembly and Fwd Center Section Bulkhead Assembly.

Page 28-10

Step 1: Remove the F-1004K L & R Center Section Side Plates.

Machine counter sink the holes in the bottom flange of the center section side plates to fit a piece of .040 skin that has been dimpled for an AN426AD3 rivet.

Deburr all holes in the center section side plate.

Step 2: Remove the F-1048A-L & R Systems Brackets.

Deburr all holes and edges.

Dimple all rivet holes EXCEPT the single hole in each of the "tabs" at the end of the systems brackets.

Step 3: Un-cleco the F-1076 Center Bottom Skin, Fwd Center Section Bulkhead Assembly, and F-1072 Fwd Fuse Bottom Skin.

Separate the Mid Fuselage Assembly from the Forward Fuselage Assembly.

Step 4: Deburr and dimple the holes along the forward edge of the F-1076 Bottom Skin.

Step 5: Remove the Fwd Center Section Bulkhead Assembly from the F-1048 Fwd Fuselage Ribs.

Machine countersink the holes on the bottom flange of the forward center section Bulkhead Assembly to fit a piece of .032 skin that has been dimpled for an AN4426AD3 rivet.

Deburr all the holes in the forward Center Section Bulkhead Assembly that have been final-drilled.

Step 6: Remove the F-1043A-l & R Fwd Fuselage Bulkheads.

Machine counter sink the holes on the bottom flange of the fwd fuselage bulkheads to fit a piece of .040 skin the has been dimpled for an AN4526AD3 rivet.

Machine countersink the holes called-out in Figure 1 to fit the head of an AN426AD4 rivet.

Step 6 (continued) Machine counter sink the nutplate attach holes in the web of the fwd fuselage bulkheads to fit the head of an AN426AD3 rivet. See Figure 1.

Deburr all holes and edges.

Step 7: Locate the F-1043B-L & R Fwd Fuselage Bulkheads.

Machine Countersink the nutplate attach holes in the web of the fwd fuselage bulkheads to fit the head of an AN426AD3 rivet. See Figure 2.

Deburr all edges and holes.

Step 8: Remove the F-1049C-L & R Fwd Fuselage Floor Ribs. See Page 28-5, Figure 2.

Final-Drill #40 the row of holes nearest the web in the flange with two rows of holes.

Deburr all holes and edges.

Step 9: Remove the F-1049A-L & R and F-1049D-L & R Fuselage Floor Ribs. See Page 28-5, Figure 2.

Deburr all holes and edges.

Step 10: Final-Drill #30 the aft flange of the the F-1049D-L & R Fwd Fuselage Floor Ribs to the web of the F-1048-L & R Fwd Fuselage Ribs.

Remove the fwd fuselage floor ribs.

Deburr all holes and edges.

Step 11: Dimple all #40 holes in all F-1049 Fwd Fuselage Floor Ribs.

Dimple all #30 holes in the fwd fuselage floor ribs EXCEPT the holes in the forward and aft tabs and the most forward hole in the upper flange. See page 28-5, Figure 2.

Step 12: Remove the F-1072 Fwd Bottom Skin from the F-1048 Fwd Fuselage Ribs See Page 28-6 Figure 3.

Remove the F-1048D Fuel Filter Brackets and VA-188 Flo-Scan Mount Bracket from the fwd skin bottom

Final-Drill #40 the nut plate attach holes in the flo-scan Mount Bracket from the fwd bottom skin.

Machine countersink the fuel filter brackets to fit a piece o .040 skin dimpled for a AN426AD3 rivet.

Deburr holes and edges of the fuel filter brackets and flo-scan mount bracket.

Dimple the holes in the flo-scan bracket. See Figure 3.

Step 13: Deburr holes and edges of the F-1072 Fwd Bottom Skin.

Step 14: Prime the following parts as/if desired.

F-1004K & L Center Side Sections.

F-1043A-L & R and F-1043B-L & R Fwd Fuselage Bulkheads.

F-1043D-L & R Cover Panels

F-1048D Fuel Filter Brackets

F-1049A-L & R, F-1049B-L & R. F-1049C-L & R, and F-1049D-L & R Forward FUselage Fllor RIbs.

F-1050-L & R Fwd Cabin Floor Panels

F-1072 Fwd Bottom Skin

F-1084A-L & R and F-1084B Systems Brackets.

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