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C. Installation of the stiffener - Repairs A and B 1) Position stiffener (3) or (9), center it carefully and mark its outline on the skin. 2) Remove the stiffener then remove all the rivets within the outline. 3) Position again stiffener (3) or (9), hold it firmly and counterdrill all the spar holes from inside the wing. Secure with pins as you progress. 4) Mark and drill the stiffener / skin attaching holes forward and aft of the spar. NOTE : For stiffener (3), refer to Figure 803 ; for stiffener (9), the rivet pitch is 1.181 in (30 mm) and the edge distance 0.394 in (10 mm). 5) On stiffener (9), mark and drill hole (7) to dia. 0.13 in (3.3 mm) (No. 30). 6) Enlarge the spar holes to dia. 0.19 in (4.9 mm) (No. 10), and the four N2 rib attachment holes for stiffener (3) as well. 7) Remove stiffener (3) or (9). ABAA Validity : S / N 1 - 9999 Page 807 57-00-00 (CA) SEP 04 8) Pin shim (2) or (8) onto stiffener (3) or (9). 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 803 or 804. 9) Using a 100° micrometric countersink, with pilot dia. 1/8 in (3.2 mm), countersink the holes in shim (2) or (8) and in stiffener (3) or (9). 10) Countersink the holes in stiffener (3) or (9) to dia. 1/8 in (3.2 mm) and 0.189 in (4.8 mm) as described in Figures 803 and 804. 11) 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). 12) Apply a protection to the stiffener and the shim - refer to Table 801. 13) Pin shim (2) or (8) to stiffener (3) or (9) with sealant (TB 09-001A) in between. 14) Cut to length and install the four countersunk/countersunk rivets - refer to Table 801. Install the rivets wet with sealant (TB 09-001A). 15) Position the stiffener, equipped with the shim, with sealant (TB 09-001A) and pin every other hole. 16) Cut to length and install the round head and/or countersunk rivets - refer to Table 801. Install the rivets wet with sealant (TB 09-001A). 17) Apply a bead of sealant (TB 09-002A) to the periphery of the stiffener and inside the wing along the spar (on both sides, and only over the repaired length). 18) On the repaired area, smear the spar flanges (extend beyond the edge, on the skin) and the rivet shanks with sealant (TB 09-001A). 19) On the non-opened area included between Ni and N4 ribs, protect the spar flanges /skins junction with waterproof compound (TB 05-027). 20) Perform paint touch-ups on the rivet heads and on the sealant seal. D. Installation of the stiffener - Repairs C and D 1) Remove existing stiffener (1) and thickness shim (4). 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(20) |
