(a)
Solvent - Final Cleaning of Metal Prior to Non-structural Bonding (Series 88) (Ref AMM/SOPM 20-30-88)
(b)
Aliphatic naphtha (Ref 20-30-31)
(2)
Thinner - methyl ethyl ketone (Ref 20-30-31)
(3)
Adhesive
(a) BMS 5-30B: EC1458, Anchor weld 0308 (Ref 20-30-11)
(4)
Vinyl sheet
B. Prepare for Repair
(1)
Install floor panel (Ref Passenger Cabin Floor - Removal/Installation).
(2)
Cut out strips of vinyl to splice edges of floor panel. Splice must overlap 3/4 inch on both sides of edges of floor panel.
(3)
Mix adhesives
(a) BMS 5-30: Mix adhesive thoroughly before using. Adhesive which has thickened excessively or gelled shall not be used. When thinning is necessary, use MEK. Unless stored in airtight containers and kept under continuous agitation, thinned adhesive shall be used within 4 hours.
(4)
Clean faying surfaces.
(a)
Clean faying surfaces between vinyl water barrier and floor panel with solvent, Series 88 (Ref AMM/SOPM 20-30-88).
(b)
Clean faying surfaces between vinyl splice and vinyl water barrier with aliphatic naphtha.
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C. Repair Vinyl Water Barrier
(1)
Repair of Vinyl Sheet Water Barrier
(a)
Brush apply adhesive to each faying surface between vinyl water barrier and floor panel.
(b)
Allow adhesive to dry until it is tacky but no longer transfers to the knuckle when touched lightly. Optimum drying time will depend on temperature and humidity.
(c)
Progressively, from center of floor panel, bond vinyl water barrier to floor panel.
(d)
Wipe away any squeezed-out adhesive with a clean rag dampened with solvent, Series 88 (Ref AMM/SOPM 20-30-88).
(2)
Repair of Vinyl Splice
(a)
Clean again faying surfaces between vinyl splice and vinyl water barrier with aliphatic naphtha.
(b)
Apply a thin, uniform brush coat of adhesive to both faying surfaces between vinyl splice and vinyl water barrier.
(c)
Allow adhesive to dry tack-free and reactivate by lightly wiping one surface with a clean cheesecloth saturated with solvent, Series 88 (Ref AMM/SOPM 20-30-88).
(d)
Join faying surfaces, applying sufficient pressure to ensure intimate contact. Care must be taken to avoid entrapping air pockets.
D. Restore Airplane to Normal
(1) Excess adhesive may be removed with solvent, Series 88 (Ref AMM/SOPM 20-30-88).
4. Mylar Water Barrier Approved Repairs
A. Equipment and Materials
(1)
Solvent - aliphatic naphtha (Ref 20-30-31)
(2)
Adhesive - Pro-Seal 501 with Pro-Seal 501-A Accelerator (Ref 20-30-11).
(3)
Mylar Sheet - Type A, 0.010-inch thick
B. Prepare for Repair
(1)
Install floor panel (Ref Passenger Cabin Floor - Removal/ Installation).
(2)
Cut out strips of mylar to splice edges of floor panel. Splice must overlap fastener line and adjoining floor panel 3/4 inch.
(3)
Clean faying surfaces with aliphatic naphtha.
(4)
Combine 100 parts by weight of Pro-Seal 501 with 30 parts by weight of Pro-Seal 501-A accelerator. Mix thoroughly by hand for approximately 5 minutes using a spatula or similar tool. If adhesive is mixed in original can, it is recommended that rim be cut out of can to make mixing easier.
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NOTE: Adhesive should be applied and spread as soon as possible after mixing. Heat of reaction of mixed material in a container will shorten work life. Work life is 20 minutes at 77°F.
Amount of adhesive to be used should be calculated on basis of 50 (+ 5) grams per square foot of surface to be covered. Too little adhesive will make removal of air bubbles difficult.
C. Repair Mylar Water Barrier
(1)
Apply adhesive to faying surface of splice.
(2)
Bond splice to water barrier.
(3)
Remove squeezed-out adhesive by wiping with naphtha dampened cloth. If any edge shows signs of delaminating, weight or tape it down until adhesive has cured.
D. Restore Airplane to Normal
(1) Allow adhesive to cure undisturbed for 2 hours minimum. Complete cure takes 12 hours or more.
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