(5)
Finish - Silk Screen Ink, BMS 10-73, Applicable color as necessary
(a)
C00367 Type I
(b)
C00368 Type II
(6)
G00077 Foam - HETROFOAM, BMS 8-133, Type I, Grade 20, Form A
(7)
G00000 Laminate - Decorative tedlar
(8)
G00380 Paper - Abrasive, 240-320 grit
(9)
G02022 Rubber - Silicone, Dow Corning Silastic RTV B
(10)
G02024 Rubber - Silicone, RTV 93-079, Clear
(11)
Tape
(a)
G00123 Doublebacked, 2 inches wide -Permacel No. 94
(b)
G00147 Masking, 1 or 2 inches wide -
Permacel No. 718Access
(1) Location Zone 200 Upper Half of the Fuselage
Repair Flat Panels or Simple Contoured Panels with Large Radii
S 348-086
(1) Use these steps to make a silicone embossing pad of the surface that is adjacent to the area you will repair:
(a) Clean the surface with aliphatic naphtha.
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(b) Make a frame, approximately 3/8-inch wide by 1/2-inch high, around the clean surface.
NOTE:____ Use wood, clay, or high temperature vacuum sealant tape for the frame.
(c) Apply a thin layer of prepared silicone rubber on the textured surface in the frame with a brush. Continue to use the brush until you cannot see air bubbles.
NOTE:____ Almost all brands, types, or colors of castable silicone rubber are satisfactory, but not the dark red types which contain finely divided iron oxide. Dow Corning Silastic RTV "B", "E", 587, or 93072, and General Electric RTV41 or RTV61 are preferred. Prepare the silicone rubber with the manufacturer's instructions.
(d) Pour the remaining silicone rubber on the brushed surface until it is 1/4 inch thick. Let it cure at room temperature for 48 hours.
NOTE:____ One pound of prepared silicone rubber will make a 10-inch-by-10-inch-by-1/4-inch replica.
(e) When the silicone is dry, remove the embossing pad from the surface.
S 348-087
(2) Attach a template with the correct hole diameter on the damaged area with the double-backed tape. Use the hole saw to remove the damaged area.
NOTE: Use a guard to make sure you do not cut the aft surface
____
of the panel.
S 348-088
WARNING:_______DO NOT TOUCH THE ADHESIVES OR BREATHE THE VAPORS. THE ADHESIVE COMPOUND CONTAINS EPOXY RESINS. THE ADHESIVE CAN CAUSE INJURY TO PERSONS.
(3) Mix the adhesive. If the adhesive is a four-component system, do the steps that follow:
(a)
Mix equal parts (by weight) of Epon 828 or DER 331 with Heloxy 68 to make component A.
(b)
Mix equal parts (by weight) of Versamid 115 and Versamid 125 to make component B.
(c)
Mix equal parts (by weight) of components A and B to make the adhesive mixture.
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757
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S 348-091
(4) Bond a piece of decorative laminate of proper color, design and texture to a piece of foam with the adhesive mixture. Let the ashesive cure.
NOTE: The foam thickness must be the same thickness as the
____
honeycomb core from the damaged area.
S 498-092
(5) Attach a template to a piece of foam with the double-backed tape.
NOTE: The hole diameter of the foam must equal the inner diameter
____
of the cutter.
S 348-093
(6)
Cut out a repair plug from the piece of foam.
S 348-094
(7)
Rub the repair plug with abrasive paper if it is necessary to get a satisfactory fit.
S 348-095
(8) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：757 AMM 飞机维护手册 EQUIPMENT/FURNISHINGS 1(21)
