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2) Counterdrill all the holes of existing stiffener (1) on new stiffener (11) or (15). Counterdrill to the same diameters, except for holes (14), which are to be counterdrilled to dia. 0.16 in (4.1 mm) No. 20. 3) Pin new stiffener (11) or (15) to the wing and mark its outline on the skin. 4) Remove the stiffener then remove all the rivets within the outline. 5) Position shim (2) or (8) in its housing and pin again stiffener (11) or (15). Repair C 6) Discard thickness shim (4), insert a sheet 0,039 in (1 mm) thick between stiffener (11) and the skin. Mark the outline of stiffener (11) on the sheet. All 7) Counterdrill all the spar holes from inside the wing. Secure with pins as you progress. 8) Mark and drill the stiffener / skin attaching holes forward and aft of the spar to dia. 0.13 in (3.3 mm) (No. 30). ABAA Validity : S / N 1 - 9999 57 00-00Page 808 (CA) JUN 02 9) Enlarge the spar holes to dia. 0.19 in (4.9 mm) (No. 10), and the N2 rib attachment hole for stiffener (11) as well. Repair C 10) Remove stiffener (11), the sheet and shim (2). 11) Cut the sheet according to the marking to make a thickness shim (12). 12) Pin shim (2) to thickness shim (12), mark and drill the four holes to dia. 0.13 in (3.3 mm) (No. 30). NOTE : These holes are used to secure the shim to the thickness shim with countersunk/countersunk rivets - refer to Table 801 and Figure 805. 13) Using a 100° micrometric countersink, with pilot dia. 1/8 in (3.2 mm), countersink the holes in shim (2) and in thickness shim (12). Repair D 10) Remove stiffener (15), thickness shim (4) and shim (8). 11) Pin shim (8) to stiffener (15), mark and drill the four holes to dia 0.13 in (3.3 mm) (No. 30). NOTE : These holes are used to secure the shim to the stiffener with countersunk/countersunk rivets - refer to Table 801 and Figure 806. 12) Using a 100° micrometric countersink, with pilot dia. 1/8 in (3.2 mm), countersink the holes in shim (8) and in stiffener (15). All 14) Countersink the holes in stiffener (11) or (15) to dia. 1/8 in (3.2 mm), 0.157 in (4 mm) and 0.189 in (4.8 mm) as described in Figures 805 and 806. 15) Deburr the parts and the holes, vacuum-clean the chips and filings and clean the parts and the area with a clean cloth moistened with cleaning agent (TB 11-002). 16) Apply a protection to the stiffener and the shims - refer to Table 801. 17) Pin shim (8) to stiffener (15), or shim (2) to thickness shim (12), depending on the case. Apply sealant (TB 09-001A) in between. 18) Cut to length and install the four countersunk/countersunk rivets - refer to Table 801. Install the rivets wet with sealant (TB 09-001A). 19) Position stiffener (15) and shim (8), or stiffener (11), thickness shim (12) and shim (2) with sealant (TB 09-001A) and pin every other hole. 20) Cut to length and install countersunk and round head rivets - refer to Table 801. Install the rivets wet with sealant (TB 09-001A). 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 57 机翼 TB20飞机维护手册(21) |
