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- Point (r) : Rivet attaching skin and stabilizer tip by the rear small spar, R.H. side. - Point (s) : Rivet attaching skin and stabilizer tip by the rear small spar, L.H. side. - Point (t) : Frame C9 axis. - Point (x) : Intersection of jk axis and aircraft centerline. - Point (x') : Intersection of firewall and aircraft centerline. ABAA Validity : S / N 1 - 9999 Page 601 51-50-01 (CA) OCT 02 C. Procedure 1) Defuel tanks - refer to 12-11-02. 2) Make sure the wing flaps are retracted. 3) Park the aircraft on a flat and clean area. 4) Level the aircraft - refer to 08-10-00. 5) Level with the sight tube. a) Position the sight tube in the aircraft centerline at 118.11 in (3 m) as a minimum from the tail cone. b) Adjust the sight tube in horizontal position. c) Sight to points a, b, e and f. d) Check that points b, e and f are at ± 0.01 in (0.3 mm) with respect to point a. NOTE : During sighting operations, make sure the sighting ruler is perfectly vertical and the horizontal pointed end is correctly centered in the punch mark. 6) Set the elevator to neutral position 0° (+ 10', - 20') - refer to 27-30-00. 7) Perform the symmetry check. a) Symmetry conditions for the wings. - Incidence conditions 3° (+ 30', - 15'). - Twisting conditions ± 15' at the tip. - Symmetry conditions 0.78 in (20 mm) level difference between wing tips. b) Symmetry conditions for the horizontal stabilizer. - Incidence conditions 0° (+ 10', - 20'). - Twisting conditions ± 15' between tips. - Symmetry conditions 0.78 in (20 mm) level difference between horizontal stabilizer tips. CAUTION : ANY DIFFERENCES IN CORRESPONDING MEASUREMENTS BETWEEN THE L.H. AND R.H. WINGS MUST BE OF THE SAME SIGN. c) Perform and record the measurements on Table 602. NOTE : Measurements are taken under rivet heads. 8) Perform the alignment check. a) Determine points t and x' on the ground and draw the aircraft centerline - see Figure 601. b) Using a plumb line, project and mark points g, h, j and k on the ground. c) Draw gh and jk axes and mark point x. d) Perform and record the measurements on Table 601. 9) Remove the sight tube. 10) Lower the aircraft to ground and remove the jacks - refer to 07-10-00. 11) Make sure all the tools and materials are removed and the work area is clean and free from debris. 12) If necessary, refuel tanks - refer to 12-11-01. ABAA Validity : S / N 1 - 9999 51-50-01 Page 602 (CA) OCT 02 Alignment and symmetry - Inspection / Check Figure 601 ABAA Validity : S / N 1 - 9999 51 50-01Page 603 (CA) OCT 02 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 51 标准施工/结构 TB20飞机维护手册(21) |
