(2)
Remove fairing carefully to avoid breakage.
NOTE: Faying surface seal may cause fairing to stick to structure in some areas. In such areas, fairing must be pried away from structure carefully to avoid breakage.
C. Install Forward Fairing
(1)
Prepare faying surfaces for sealing per Chapter 51, Seals and Sealing.
(2)
Apply removable faying surface seal per Chapter 51, Seals and Sealing.
(3)
Place fairing in position on wing tip closure rib and wing tip splice.
(4)
Install fasteners.
NOTE: For replacement wing tip navigation light windows that require drilling and chamfering of fastener holes, refer to (57-21-11/401) Drilling and Chamfering of Fastener Holes, as needed.
3. Removal/Installation Aft Fairing
A. Equipment and Materials
(1) Faying surface sealant - BMS 5-79, class B or BMS 5-95, class B (Ref 20-30-11)
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57-21-11 Figure 401 Feb 15/68
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
B. Remove Aft Fairing
(1)
Remove forward fairing per paragraph 2.B.
(2)
Remove all fasteners along wing tip closure rib. (See figure 401).
(3)
Remove aft fairing.
NOTE: The faying surface seal may cause the fairing to stick to structure in some places. In such areas, the fairing must be pried away carefully.
(4)
If wing tip is going to remain removed for any length of time, protect closure rib to avoid damage to sealing.
C. Install Aft Fairing
(1)
Prepare faying surfaces for sealing per Chapter 51, Seals and Sealing.
(2)
Apply removable faying surface seal per Chapter 51, Seals and Sealing.
(3)
Place aft fairing in position on wing tip closure rib.
(4)
Install all fasteners along wing tip closure rib.
NOTE: For replacement wing tip navigation light windows that require drilling and chamfering of fastener holes, refer to (57-21-11/401) Drilling and Chamfering of Fastener Holes, as needed.
(5)
Install forward fairing per paragraph 2.C.
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4. Drilling and Chamfering of Fastener Holes, as needed (Fig. 402).
A. Equipment and Materials.
(1)
Drill Bit - Boeing Standard Tool ST10-1257-B, .281 Dia., or equivalent.
(2)
Rotary File - Nicholson 50173, or equivalent.
CAUTION: INCORRECT DRILLING CAN MAKE MICROSCOPIC SIZE AND LARGER FLAWS THAT CAN CAUSE IN-SERVICE CRACKING IN THE WINDOW. ADDITIONALLY, INCORRECT DRILLING MAY OVERHEAT THE SURROUNDING MATERIAL AROUND THE HOLE WHICH MAY MAKE RESIDUAL STRESSES THAT MAY ALSO LEAD TO IN-SERVICE CRACKING OF THE WINDOW.
a) Drill a hole in the wing tip navigation light window at all fastener locations (Fig. 402).
NOTE: Use a drill speed of 1200 to 1500 RPM. Cutters should be kept at a near room temperature when drilling successive holes.
b) Use the file to make a chamfer at each fastener location (Fig. 402).
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Apr 01/97 Figure 402 57-21-11
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REMOVABLE WING TIP - APPROVED REPAIRS
1. Forward Fairing Approved Repairs
A. General
(1) The forward fairing, or navigation light window, is made of acrylic plastic. Repairs of plastic window must not create noticable optical distortion over more than 10% of the window area.
B. Equipment and Materials
(1)
Drill - 1/4 inch or 3/8 inch
(2)
Cement - PS-18 or EC-2216B/A clear (Ref 20-30-11)
(3)
Abrasive paper -Wet-or-dry 240, 280, 320, 400, 600 grit
(4)
Acrylic plastic sheet - Plexiglass 55, 0.10 inch thick
(5)
Cleaning solvent -Aliphatic Naptha (Ref 20-30-31)
(6)
Soap and water
(7)
Masking tape
(8)
Cellophane
(9)
Clean cloth - chamois and cotton flannel
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