(4)
Allow adhesive to cure the minimum time required (par. 1.C.(1)).
D. Repair delaminated areas which may result in leaks on propagation of damaged area.
(1)
Repair delamination on sealing edge (fabric intact).
(a)
Prepare faying surfaces per par. 5.
(b)
Repair seal using Method A (par. 1.B.(1)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)).
(c)
Press surfaces firmly together as soon as possible after application of adhesive to ensure complete contact and exclude air pockets.
(d)
Allow adhesive to cure the minimum time required (par. 1.C.(2) or (3)).
(2)
Repair delamination on sealing edge (fabric damaged).
(a)
Remove damaged fabric by carefully peeling away from seal.
(b)
Prepare seal surfaces per par. 5.
(c)
Repair seal using Method B (par. 1.B.(2)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)). 1) Cut a patch of D-117 or D-118 fabric and press it into the wet adhesive on seal
surfaces. 2) Apply three or four uniform coats of adhesive over the fabric to build up a film of adhesive over fabric.
(d)
Allow adhesive to cure the minimum time required before stressing bond.
(3)
Repair delamination away from sealing edge (on flange or channel - fabric intact).
(a) Proceed per par. 6.D.(1).
(4)
Repair delamination away from sealing edge (on flange or channel - fabric damaged).
(a)
Remove damaged fabric by carefully peeling away from seal.
(b)
Prepare seal surfaces per par. 5.
(c)
Repair seal using Method B (par. 1.B.(2)) with a Type I, Type II or Type III adhesive (par. 1.C.(1), (2) or (3)). 1) Cut a patch of D-117 or D-118 fabric and press it into the wet adhesive on seal
surfaces. 2) Apply a coat of adhesive over the fabric.
(d)
Allow adhesive to cure the minimum time required before stressing bond.
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7. Repair Cuts or Splits in Rubber in Joint Area
A. General
(1) Repair procedures for the above types of damage consist of cleaning and reinforcing the damaged area using Method B (par. 1.B.(2)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)). Ref par. 6.D.(2) and 6.D.(4).
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52-09-100 Page 808 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/01
8. Repair Cuts or Splits in Extruded or Molded Seal Section
A. General
(1) Repairs to the extruded seal section are divided into three groups; (1) repairs on seal body, (2) repairs on retaining flange, (3) repairs on seal lip or flat side of seal (Fig. 802). Procedures within these groups are divided according to size of damage and type of adhesive used in the repair. In repairs to areas away from the seal lip with no fabric reinforcement Dow Corning A-4000, or General Electric PSA-529 adhesive only should be used; if fabric reinforcement is required, any approved adhesive may be used. In all types of repairs to the seal lip or flat side of seal, Dow Corning Silastic 140; Dow Corning 93-076-1/2 or -2; or General Electric RTV 174 adhesive only must be used as this adhesive, when cured, allows flexibility of the lip under operational conditions, thus ensuring an airtight seal.
B. Repair bulb and blade type seal.
(1)
Repair small splits or nicks.
(a)
Cut out the damaged area leaving a round smooth hole not greater than 0.20 inch in diameter.
NOTE: This may be accomplished using a sharpened tube as the drill bit.
(b)
Repair seal using Method A (par. 1.B.(1)) with a Type I, Type II or Type III adhesive (par. 1.C.(1), (2) or (3)).
(2)
Repair large splits (1 inch maximum length).
(a)
Flex the seal to open the split.
(b)
Carefully cut out the ends of the split to a round smooth hole and miter the edges. The hole may be drilled using a sharpened tube as the drill bit.
(c)
Prepare seal surfaces for repair (par. 5).
(d)
Coat split surfaces with a Type II or Type III adhesive (par. 1.C.(2) or (3)) and leave a few minutes to allow adhesive to reach the tacky stage.
(e)
Press the coated surfaces together and hold under pressure until adhesive cures.
(3)
Repair large splits (2 inches maximum length with gap open).
(a)
Prepare both surfaces and surrounding area per par. 5.
(b)
Carefully cut ends of split to a smooth round hole. The hole may be drilled using a sharpened tube as the drill bit.
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