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2) Check the location and the length of the crack. The crack must not exceed 0.787 in. (20 mm) and must not alter the pilot visibility through the windshield (deformations). 3) If the crack is longer than 0.787 in. (20 mm), replace the windshield - refer to 56-10-00. CAUTION : MAKE SURE THE SURFACE IS FREE FROM SCRATCHES BEFORE PERFORMING CRACK STOPPAGE AND CHAMFERS. 4) If the crack is lower than or equal to 0.787 in. (20 mm), perform a crack stoppage. Drill a hole using a drill No. 47 (dia. 2 mm) sharpened to 150° at 0.20 in (5 mm) from the end of the crack (at both ends if necessary). Moderately press the drill point to avoid material overheating. NOTE : If the crack starts at an attachment, remove the latter and enlarge the rivet or bolt hole by 0.039 in. (1 mm) max. using a cylindrical milling cutter with very fine teeth to remove other possible crack starts. 5) Put adhesive tape (TB 08-919) on both sides of the transparent panel around the crack to protect them against unforeseen scratches. 6) Chamfer both sides of the transparent panel using a tool for chamfering or a sharp knife blade. NOTE : To make the tool for chamfering or sharpen the knife blade - refer to Figure 801. 7) Clean the transparent panel with an air gun. CAUTION : READ THE TECHNICAL HANDBOOK ON RESIN (TB 08-933) CAREFULLY. 8) Prepare resin (TB 08-933), allow the solution to degas several minutes before emptying it into a syringe with a big needle. 9) Remove the air from the syringe, letting it eventually degas, then lay a fine thread of resin in each chamfer. 10) Plug the hole(s) drilled for crack stoppage and the chamfer with resin (TB 08-933). Wait for several minutes and do it again until attaining a light overthickness. 11) Carefully clean excess resin (TB 08-933). 12) Remove adhesive tape from the transparent panel when the resin is partially dry. 13) Wait for complete curing of resin (TB 08-933). 14) Carefully remove the resin overthickness using the tool for chamfering. NOTE : This process is relatively long, but the final result depends on it. Scrape the bead flush as accurately as possible on both faces. 15) Sand using abrasive cloth (TB 05-916) with increasing sizes of abrasive and water. NOTE : Use a small piece of wood to direct the action of the abrasive cloth. AMA Validity : S / N 1 - 9999 56-00-00 Page 802 56 (BA) SEP 04 16) Using an unwoven cloth or cheese cloth (TB 11-911), apply a polishing product (TB 05-902) with circular movements. 17) Wipe off and repeat the polishing operation if necessary. 18) Clean the transparent panel - refer to 12-22-04. AAAA Validity : S / N 1 - 9999 56-00-00 Page 803 (BA) SEP 04 LAME DE COUTEAU ( meulee ) KNIFE BLADE ( sharp ) > 5 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 56 窗 TB20飞机维护手册(4) |
