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CHAPTER 6
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SERVICE MANUAL
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CHAPTER 6
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SERVICE MANUAL
ISO 9650
5.3.4 Apply adhesive to the outer repair patch as per the requirements in
this Chapter and allow to dry.
5.3.5 When the adhesive is touch dry, apply the patch to the repair area
ensuring it is centrally aligned.
5.3.6 Use a spatula or roller to expel the air from under the patch, ensuring
that there are no creases. Once again, press from the cent
er
to the
edge. Allow suff
i
cient time for the repair to cure (recommended 24
hours), before making a pressure test on the repaired chamber prior
folding and packing the liferaft.
5.4 Types of patches
5.4.1 Repair patches must overlap at least 25 mm (1”) beyond the edge of
the damage, (FIGURE 602) e.g:
(a) If the diameter of a jagged aperture is 25 mm (1”), the patch
must be at least 75 mm (3”) diameter.
(b) If a straight tear is 25 mm (1”) long, the patch must be at least
75mm (3 in) × 50 (2”) mm.
(c) Treat ‘L’ shaped tears as apertures; calculate the “diameter” as
the distance between the ends of the tear.
5.4.2 Patches must be circular or rectangular with rounded corners,
(FIGURE 602).
5.4.3 Repair patches on air-holding components may be made from the
same material as that of the air-holding chamber.
5.5 Applying patches and tapes
5.5.1 To apply patches or tapes, the following procedure must be followed:
(a) Cut the patch to size.
(b) Prepare and clean the area as described in Step 3.
(c) When the adhesive coat develops an aggressive tack, put the
patch in position and use a hand roller to roll it into f
i
rm contact.
Ensure the patch is orientated correctly i.e. ‘proof’ surface to
‘proof’ surface. Adhesive joints are not permitted to join one or
more textile surfaces.
(d) Use a spatula to remove any air bubbles from under the patch.
(e) After a repair to an inf
l
atable chamber has cured, the inf
l
atable
chamber must be subjected to a pressure holding test.
(f) If damage is along the edge of a seam then the patch must
extend across the central seam joint, (FIGURE 603).
