(c)
Repair seal using Method B (par. 1.B.(2)). 1) Coat split surfaces and surrounding area with a Type I, Type II or Type III adhesive (par. 1.C.(1), (2) or (3)). 2) Cut a patch of D-117 or D-118 fabric large enough to overlap 0.50 inch on sides
and ends of split. 3) Press fabric into the wet adhesive on seal surface (Fig. 802).
(d)
If the required 0.50 inch overlap carries fabric over the seal lip, extend fabric down the flat sealing surface to within 0.25 inch of the retaining flange corner.
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Typical Seal Section Repairs 500
52-09-100 Figure 802 May 15/77
Page 810
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
CAUTION: DOW CORNING SILASTIC 140 OR DOW CORNING 93-076-1/2 OR -2 ADHESIVE MUST BE USED IF FABRIC CARRIES OVER SEAL LIP. ONLY THESE ADHESIVES ALLOW FLEXIBILITY OF LIP.
C. Repair retaining flange (3 inch maximum patch length).
(1) General
(a)
Repair procedure for a damaged retaining flange consists of preparing surfaces (par. 5) and repairing the seal using Method B (par. 1.B.(2)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)). The procedure is described in par. 6.D.(4).
(b)
If a section of seal rubber is missing, a matching piece may be cut from a scrap seal and bonded in place using Method C (par. 1.B.(3)) with a Type II or Type III adhesive, (par.1.C.(2) and (3)) and reinforced with a fabric patch. Ref par. 6.D.(4).
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May 01/01 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-09-100 Page 811
NOTE: Fabric patches shall overlap 0.50 inch minimum on all sides of damaged areas but shall not extend more than 0.25 inch up the flat side of the seal. Maximum allowable patch length is 3.0 inches (Section A-A, Fig. 802).
D. Repair sealing lip or flat side of seal (3 inch maximum patch length).
(1) General
(a)
The repair procedure for a damaged sealing lip or flat side of seal consists of preparing surfaces (par. 5) and repairing the seal using Method B or Method C (par. 1.B.(2) or (3)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)). Apply one brush coat of the Type II or Type III adhesive then lay up the fabric patch and press into position (Sections B-B and E-E, Fig. 802., Ref par. 6.D.(2)).
(b)
When a portion of the seal is missing, trim all ragged edges and repair using a similar section of a surplus seal. Proceed with fabric patch using Method C (par. 1.B.(3)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)).
NOTE: Cut fabric patches to overlap 0.50 inch minimum on all sides of damaged areas . Adjust so that the patch covers the seal lip and comes to within 0.25 inch of the seal flange on both sides of the lip. No patch should terminate on the flat sealing area. Maximum allowable patch length is 3.0 inches (Section D-D, Fig. 802).
(c)
Small imperfections or minor damage extending into the lip not more than 0.08 inch may be faired into the seal lip over a length of 0.50 inch to 1.0 inch with a Type II or Type III adhesive (par. 1.C.(2) or (3)). Faired surface must be smooth and free of cuts or nicks which might propagate under flexing.
9. Repair Splices
A. Repair splices (galley and entry doors).
(1) Repair splice using Method A or Method B (par. 1.B.(1) or (2)) with a Type II or Type III adhesive (par. 1.C.(2) or (3)). Proceed as in par. 6.C. or 6.D.
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B. Repair separated splice bonds (cargo doors and escape hatches).
(1)
Clean seal surfaces for approximately 2.0 inches on each side of splice per par. 5.
(2)
Cut a patch of D-117 or D-118 fabric a minimum of 2.0 inches wide and long enough to wrap completely around seal.
(3)
Apply a liberal brush coat of Type II or Type III adhesive (par. 1.C.(2) or (3)) to cleaned seal surfaces.
(4)
Press fabric patch into wet adhesive on seal and wrap it completely around seal, smoothing it into all contours, and trim off excess material.
(5)
Apply several additional thin coats of adhesive by brush.
(6)
Feather or fair the edges of the patch, taking special care to get a smooth surface on the sealing lip. Avoid using an excessive thickness of adhesive which will produce a stiff, rigid area over the seal lip.
10. Repair Large Seal Areas or Severely Damaged Seal Sections
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