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20-23-11-991-029
20-23-11-991-030
20-23-11-991-031
3. Job Set-up__________
Subtask 20-23-11-917-063
A. General
Bleeding Procedure of the Blue Hydraulic System Downstream of the Blue E-Pump Pressurize the Green Hydraulic System Pressurize the Yellow Hydraulic System Pressurize the Blue Hydraulic System with a Ground Power Supply Pressurization of the Hydraulic Reservoirs through the Ground Connector Bleeding of the Normal Braking at the Brake Units Filling and bleeding of the Low Pressure Control System of the Alternate Braking Bleeding of the High Pressure Alternate Braking SystemFig. 239Fig. 240Fig. 241
(1)
The H-fitting is approved for the permanent repair of middle-line tubes when:
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the applicable swaging equipment or other special tools are not available,
-
the repair must be immediate (this repair procedure is faster than other repair procedures).
(2)
The repair of tube assemblies with H-fittings is permanent for specified pressures of less than or equal to 3000 psi (206.8427 bar) in:
-corrosion-resistant steel tubes (21-6-9), OD: 6.35 mm (0.2500 in.)
7.94 mm (0.3125 in.) 9.52 mm (0.3748 in.) 12.7 mm (0.5000 in.)
15.87 mm (0.6248 in.) 19.05 mm (0.7500 in.) 25.4 mm (1.0000 in.)
-light alloy tubes (6061T6), OD: 6.35 mm (0.2500 in.) 9.52 mm (0.3748 in.) 12.7 mm (0.5000 in.) 15.87 mm (0.6248 in.)
(3)
Four usual repair procedures give a solution for most repairs. (Ref. Fig. 239/TASK 20-23-11-991-029)
Repair Procedures Figure 239/TASK 20-23-11-991-029
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4. Procedure
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Subtask 20-23-11-917-062
A. Tube Repair Procedure
(1) Use the applicable fitting (refer to the H-fitting Dimensions and Part Numbers Table). (Ref. Fig. 240/TASK 20-23-11-991-030)
NOTE : Each fitting is supplied in a plastic bag which also contains
____
a positioning template and tape.
(2) Installation procedure for SIERRACIN/HARRISON H-fittings. (Ref. Fig. 241/TASK 20-23-11-991-031)
NOTE : You can repair defects or chafing areas that are less than or
____ equal to 9.52 mm (0.3748 in.) across. You must splice defects that are larger. The minimum dimension that you can splice is
114.3 mm (4.5000 in.).
(a)
Cut and deburr the damaged tubing. NOTE : The maximum distance between the ends of the tubes is 6.35
____
mm (0.2500 in.).
(b)
Carefully clean the ends of the tube with CLEANING AGENTS (Material No. 11-003). Make sure that the tube I.D. and O.D. are clean.
(c)
Use the template to find the position of the tape (2) on the tube at 14.22 +0.5 -0 mm (0.5598 +0.0196 -0.0000 in.) from the end of the tube.
(d)
Find the tube insertion mark at 36.6 +0 -0 mm (1.4409 +0.0000 -0.0000 in.) from the other end of the tube.
(e)
Wind on only one layer of tape (5). Cut off the unwanted tape.
(f)
Put the union (2) in position against the tape (5).
(g)
Engage the slide (4) on the tube. The rounded end of the slide must be against the union (2).
(h)
Engage the nut (1) on the slide (4) side.
(i)
Engage the coupling (3) on the union (2) side.
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Dimensions and Part Numbers Figure 240/TASK 20-23-11-991-030
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H-Fitting Installation Figure 241/TASK 20-23-11-991-031
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(j) Engage the nut (1) in the coupling (3) and tighten it with the union (2) against the tape (5).
(k) Hold the coupling end. Do not turn the coupling (3).
(l) Tighten the nut (1) until you feel a high torque. This occurs then the slide (4) and the coupling (3) close tightly against the union (2).
(m) Make sure that you can see the insertion mark on the tube.
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