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10) Once the fuel hoses secured, make sure there are no low points.
11) Degrease the fittings and the hoses nuts and mark with red paint.
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D. Typical installation of a tube
1) Prior to installation, visually inspect the tube for cleanliness. A tube whose protective caps are missing must be thouroughly cleaned before it is installed.
2) Inspect the tube for damage, especially in the area of the flares and fittings. Any tube damaged beyond the specified limits must be replaced - refer to Figure 201.
3) Prior to installation, make sure the fittings are correctly aligned and properly tightened.
4) Prior to installation, check the alignment and the adjustment of the tube as follows
a) Position the tube in correct installation position and tighten the nut at one end of the tube assembly.
b) The free end of the tube must be parallel to the fitting.
c) The free end of the tube must be aligned with the fitting.
d) The free end of the tube must be longitudinally aligned with the fitting cone.
5) Remove the old red paint marks.
6) If necessary, lubricate the fittings with the system fluid or with the product recommended in the procedure.
7) Install the tube on the fittings and tighten the securing nuts to the specified torque value - refer to Table 201.
8) Degrease the fittings and the nuts of the tubes and mark with red paint.
E. Tightening torques
Fitting
Dash
Nos Fitting
thread Tube
Outer Diameter Aluminium alloy Stainless steel
lbf.in N.m lbf.in N.m
-3 .375-24 3/16 in (4,76 mm) 30 - 52 3,4 - 5,9 87 - 99 9,8 - 11,2
-4 .4375-20 1/4 in (6,35 mm) 39 - 64 4,4 - 7,3 135 - 146 15,2 - 16,6
-5 .500-20 5/16 in (7,94 mm) 60 - 77 6,8 - 8,8 135 - 151 15,2 - 17,1
-6 .5625-18 3/8 in (9,52 mm) 74 - 121 8,3 - 13,7 208 - 233 23,5 - 26,4
-8 .750-16 1/2 in (12,70 mm) 147 - 246 16,6 - 27,9 443 - 494 50 - 55,9
-10 .875-14 5/8 in (15,87 mm) 200 - 346 22,5 - 39,2 642 - 693 72,5 - 78,4
-12 1.0625-12 3/4 in (19,05 mm) 295 - 494 33,3 - 55,9 885 - 989 100 - 111,8
-16 1.3125-12 1 in (25,40 mm) 494 - 693 55,9 - 78,4 1189 - 1388 134,3
156,9
NOTE : When one of the the interfaces is made of aluminium alloy, aluminium tightening torque must be applied. Torque values applicable to torque wrench without extension.
Tightening torques for 37° tapered seat fittings
Table 201
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Validity : S / N 1 - 9999 20 00-02Page 202
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本文链接地址：TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(14)
