A320飞机维护手册 AMM STANDARD PRACTICES-AIRFRAME(22)

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 (2) Make sure that the parts you assemble are not damaged. Specially, examine the sealing surfaces (on fittings and pipe ends) and the threads of the fittings.
 NOTE : Reject any part that shows signs of damage (scratches, nicks,____ deformation...).
 4. Procedure_________
 Subtask 20-23-11-917-082
 A. Lubrication (Ref. Fig. 204/TASK 20-23-11-991-064)
 CAUTION : ONLY USE THE SPECIFIED LUBRICANT TO LUBRICATE THE FITTING_______ THREADS AND THE SHOULDER OF THE SLEEVE.
 CAUTION : ONLY USE HYDRAULIC FLUID MATERIAL N. 02-003 TO LUBRICATE THE_______ O-RING AND THE THREAD (O-RING SIDE) ON PLUG-IN FITTINGS. OTHER LUBRICANTS CAN CAUSE DAMAGE TO THE O-RING.
R  (1) Lightly lubricate with HYDRAULIC FLUIDS (Material No. 02-003) or COMMON GREASE (Material No. 04-015): - the internal thread of the housing - the shoulder of the sleeve (when possible). 
R R R R R  NOTE : Lubricate the internal thread of the housing to get the____ highest possible load on the contact surfaces. Lubricate only the internal thread of the housing because the lubricant can extrude the O-ring during assembly. 
R R  NOTE : Do not apply lubricant on the contact surfaces between the____ sleeve and the sealing surface of the fitting. Lubricant can cause the pipe to turn when you torque the sleeve nut.
 (2) Remove unwanted lubricant with a clean, dry lint-free cloth.

 

R  Lubrication of the Connections Figure 204/TASK 20-23-11-991-064
 1EFF : 1 1 1CES  ALL  1 111 20-23-11 Page 214 Aug 01/05

 

 Subtask 20-23-11-917-083

 B. Assembly 
R R R R  NOTE : Connection on straight plug-in fittings or bulkhead fittings:____ - Straight plug-in fittings. You must install and torque the straight plug-in fitting to the applicable torque value before you connect the pipe (Ref. TASK 20-29-00-911-001). - Straight bulkhead fittings. You must install the straight bulkhead fittings and torque the locknut to the applicable value before you connect the pipe. - Swivel bulkhead fittings. You must connect and torque the pipe sleeve nuts (at each end of the fitting) to the applicable value before you torque the locknut of the swivel bulkhead fitting to the applicable value. 
R R R R  (1) Put the pipe in position and make sure that: - the pipe you install is not too short or too long - the pipe you install can be put in position without too much force on the clamp blocks - the pipe is correctly aligned at unions. 
R R  NOTE : The force necessary to correctly align the pipe must not be____ more than light finger pressure (1 daN (2.2480 lbf)). 
R R  (2) Align the pipe and the fitting and engage tube end. The sleeve must fully touch the mating surface of the fitting. 
R R  (3) Tighten the sleeve nut with your hand until it touches sleeve shoulder. 
R R  NOTE : The nut must turn freely on the thread. This shows that the____ tube ends are correctly aligned.
 NOTE : You must connect and tighten with your hand all the ends of____ the pipe before you apply the tightening torque on one end.
 NOTE : When you install a pipe on a tee or a cross, you must connect____ and tighten with your hand all the connections of the tee or the cross before you apply the tightening torque on one end.
 NOTE : When you connect a flexible hose, make sure that you do not____ twist the hose during the assembly.
 (4) Attach the clamp blocks without tightening.

 

 Subtask 20-23-11-917-084
 C. Tightening Torque Application
 CAUTION : WHEN YOU TORQUE THE NUT, ALWAYS USE A SECOND WRENCH TO APPLY A_______ COUNTERTORQUE TO THE FITTING.
 (1) Find the correct torque value (Ref. TASK 20-21-12-911-001). 
R R  NOTE : To find the correct torque value, you must know the material____ and the dimension of the parts you assemble. If the connection has different materials, you must use the torque value for the weakest material.
 (2) Get the applicable torque wrench and the applicable wrench adapter for the nut and an applicable second wrench to apply the countertorque to the fitting. We recommend the tools from the STANDARD TORQUE TOOL SET (98F29003000000).
R  (3) Set the torque wrench to the applicable value. When you use a wrench adapter, you must adjust the value. (Ref. Fig. 205/TASK 20-23-11-991-065) 
R R  (4) Put the torque wrench in position on the sleeve nut and the countertorque wrench in position on the fitting. (Ref. Fig. 206/TASK 20-23-11-991-066)
 NOTE : We recommend that you install the wrench adapter in the same____ axis as the torque wrench.
 NOTE : The torque wrench must always be installed on the nut (female____ part) and the countertorque wrench on the fitting (male part). 
R R  (5) Apply a slow and continous force on the torque wrench until you have the set torque value.
　
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