D. Repair Limitations
S 218-001
(1)
Signs of moisture or fluid contamination inside the insulation layer requires replacement of the blanket.
S 218-002
(2)
Total repairs of torn or damaged fabric covering (not including delaminated or torn aluminum foil) shall not exceed 10 percent of the blanket surface.
S 218-003
(3)
Repairs involving repair of the delaminated or torn aluminum foil covering (not including fiberglass under layer) does not have a repair limit.
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747-400 MAINTENANCE MANUAL
E. Repair of delaminated and/or torn aluminum foil.
S 168-004
(1) Remove areas of damaged or delaminated foil.
(a) If the foil is firmly bonded in repair area, carefully scrape it off the underlying fabric layer.
S 168-005
(2)
Sand the foil to remove gloss surrounding the area of repair to provide 1 inch of overlap.
S 118-006
(3)
Solvent clean the repair area with MPK or acetone.
S 378-007
(4)
Prime the repair area with DC1200.
S 358-008
(5)
Allow a minimum of 30 minutes, and a maximum of 2 hours curing time before applying RTV sealant.
S 358-009
(6)
Apply a 0.005 to 0.010 inch coat of RTV 60 sealant to the repair surface.
S 358-010
(7)
Apply a repair patch of AMA 138 precured aluminized fiberglass cloth (style 112) to the repair area.
S 358-011
(8)
Cover the repair area with release film and apply weight (sand bags) to ensure that the edges of the repair patch are firmly bonded.
S 358-012
(9)
Allow sufficient time to cure, depending upon the catalyst mix ratio.
S 358-013
(10)
Alternative to applying RTV 60 and AMA 138 patch is to apply 0.010 coat of RTV 60 or RTV 106 to repair area, overlapping at least 0.50 inch.
(a) Allow time to cure - for RTV 106 allow 24 hours to cure before returning to service.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
F. Repair of torn or damaged fabric covering.
S 358-025
(1)
Remove the foil 2 inches back from the damage area by peeling and scraping the foil.
S 358-017
(2)
Foil that is firmly bonded may be sanded to eliminate gloss.
S 358-014
(3)
Sew a flameproof ceramic fabric patch (Nextel or Astro-quartz) over the damaged area with a 1-inch overlap.
S 358-015
(4)
Ensure the stitching loops through both fabric layers, and use a minimum of three stitches per inch.
S 358-016
(5)
Solvent clean the repair area (MPK or acetone).
S 358-018
(6)
Prime the repair area with DC1200.
S 358-019
(7)
Allow 30 minutes to 2 hours for the primer to cure.
S 358-020
(8)
Apply a 0.005 to 0.010 inch coat of RTV 60 to the repair area.
S 358-021
(9)
Apply a repair patch of AMA 138 aluminized fiberglass cloth (style 112).
S 358-022
(10)
Cover the repair area with release film and apply weight (sand bags) to make sure the edges of the repair patch are firmly bonded.
(11)
Allow time to cure, depending upom the catalyst mix ratio.
S 358-026
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