(2)
The second task gives instructions for the permanent repairs to flat liners or slightly curved liners.
(3)
The third task gives instructions for the repair of molded panels, shrouds, and panels with complex curves.
(4)
The fourth task gives instructions for the repair of silicone impregnated fiberglass.
D. There are four permanent repair alternatives for the flat or slightly curved liners.
(1)
It is necessary to remove the liners from the airplane for these permanent repairs:
(a)
The use of rivets with a bonded fiberglass patch.
(b)
The use of screws with a bonded fiberglass patch.
(2)
It is not necessary to remove the liners for these permanent repairs:
(a)
The Thermion Repair System which uses a bonded patch.
(b)
The Akro Fireguard System which uses a bonded patch.
E. If the permanent repairs done to the cargo liners are not one of the above alternatives, you can install mechanical fasteners around the edges of the existing patches. Refer to one of the first two permanent repair procedures for the fastener installation. If you can remove the old patch, such as a temporary repair, you can install a bonded patch over the original damage. Refer to one of the last two permanent repair procedures for the installation of a bonded patch.
F. Where renewal of fiberglass panels is necessary, the sidewalls may be replaced with .9 mm 5154 (Com-ZR050) aluminum alloy and the ceiling with .7 mm 5154 (Com-ZR036) alloy.
2. Repair the Loose or Damaged Tape
A. Equipment and Materials
(1)
Cheesecloth - BMS 15-5 (Ref 20-30-51/201)
(2)
Solvent – Final Cleaning of Composites Prior to Non-Structural Bonding (Series 91) (Ref AMM/SOPM 20-30-91)
(3)
Tape (Ref 20-30-51/201)
NOTE: Use one of these tapes:
(a)
Permacel - Glass Cloth, Flame Resistant, P621
(b)
Permacel - Glass Cloth, Flame Resistant, P212HD
(c)
3M 367-FR
500
May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 25-52-100 Page 801
B. Procedure
(1)
Remove and discard all loose or damaged tape.
(2)
Clean the damaged area with a clean cheesecloth that is moist with solvent.
(3)
Dry the area with a clean dry cheesecloth before the solvent dries.
(4)
Clean the area again to fully remove the dirt, oil, paint, and other unwanted materials.
NOTE: A clean surface is necessary for a good bond.
(5)
Apply new tape.
NOTE: Do not use the old tape again. If you use the tape again, it will not have a satisfactory bond.
3. Permanent Repairs to Flat Liners or Slightly Curved Liners
A. General
(1)
These repairs contain four alternatives. It is only necessary to use one of the four alternatives.
(2)
Use the applicable consumable materials that are necessary for the repair procedure you use.
B. Equipment and Materials
(1)
Cherry Monel rivet gun (commercially available)
(2)
Knife or scissors (commercially available)
(3)
Abrasive paper (80-grit) - commercially available
(4)
Use the materials that follow for the riveted and bonded fiberglass patch repair procedure:
(a)
Adhesive - Film, BMS 5-91, Type I, II, or III
(b)
Rivet - Cherry Monel - Blind, P/N CR8M83-6-2, Supplier: Cherry Aerospace Fasteners
(c)
Tape - 3M 367-FR (3 inches wide)
(d)
Liner - Glass Fiber - Reinforced Phenolic Laminate, BMS 8-223, Grade B
(e)
Alcohol - Denatured
(5)
Use the materials that follow for the bonded patch with screws repair procedure:
(a)
Adhesive - Film, BMS 5-91, Type I, II, or III
(b)
Tape - 3M 367-FR (3 inches wide)
(c)
Liner - Glass Fiber - Reinforced Phenolic Laminate, BMS 8-223, Grade B
(d)
Alcohol - Denatured
(e)
Screws - Steel Sheet Metal, 0.164 inch diameter (U.S. size No. 8) x 3/16 inch long -Commercially available
(6)
Use the materials that follow for the Thermion Repair System:
(a)
Epoxy - Master Bond high temperature, EP65HT-1
(b)
Patch Kits - Thermion Heat Resistant, P/N 9290-1 thru -7, Supplier: Thermion Inc.
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