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AC 43.13-1B 9/8/98 (e) The inside patch should be ce- mented simultaneously with the application of cement to the inside of the raft. Apply the same number of coats as directed in para- graph 9 42b(2)(d) to the side of the patch that is applied to the injured fabric of the raft. En- sure that each coat is thoroughly dry before applying the next coat. (f) To aid in adhesion, prior to ap- plying the patch, the inside area to be repaired and cemented surface of the patch should be cleaned with a cloth moistened with rubber solvent. The cement will then become tacky. (g) Apply the patch. Fold the patch lengthwise in the shape of the letter “U” and insert the patch between the torn edges of the injury on the life rafts. Position the patch so that the fabric at the end of the tear will coin- cide with a cross line and the center line on the patch follows one edge of the torn fabric. At- tach one edge of the torn fabric along the cen- ter line on the patch. (h) Inspect the repair for wrinkles. Working from the attached edge of the fabric to the edge of the patch, remove the wrinkles with a stitcher. Lay the opposite edge of the torn fabric on the patch so that it butts the edge of the torn fabric that has already been applied to the patch. Remove the wrinkles. Thor- oughly roll the patch with a 2 inch rubber roller. NOTE: The surface under the patch should be as smooth as possible so that the torn edge of the fabric may be at- tached to the patch instead of at- tempting to attach the patch to the fabric. (i) Scatter the handful of talc that was placed inside the tube by grasping the sides of the flotation tube and pulling them apart. (j) Prepare and attach the outside patch as outlined in “OUTSIDE PATCHES,” sub-paragraphs 9-42b(1)(a)-(e). (k) Allow to cure for at least 60 hours before performing leak tests and storing. (3) Seams and Tapes. (a) Remove all old or dead cement from the area that will require recementing. Dampen the repair area with a solvent- moistened cloth; then roll or rub off the old cement. (b) Apply cement to the surface as outlined in “OUTSIDE PATCHES,” sub- paragraph 9-42b(1)(a)-(e). (c) Roll thoroughly with a roller to ensure that all air pockets are removed and a firm bond is secured. (d) Allow to dry and apply talc over the seam as previously outlined. (e) Allow to cure for at least 60 hours before performing leak tests and storing. 9-43. LIFE PRESERVERS. Inflatable life preservers are subject to general deterioration due to aging. Experience has indicated that such equipment may be in need of replacement at the end of 5 years due to porosity of the rub- ber-coated material. Wear of such equipment is accelerated when stowed on board aircraft because of vibration which causes chafing of the rubberized fabric. This ultimately results in localized leakage. Leakage is also likely to occur where the fabric is folded because sharp corners are formed. When these corners are in contact with the carrying cases, or with adja- cent parts of the rubberized fabric, they tend to wear through due to vibration. Page 9-34 Par 9-42PDF Image | AFS-640
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