A320飞机维护手册 AMM STANDARD PRACTICES-AIRFRAME(16)

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R 
R  - Causes local damage to the protection of the bolts and 
R  nuts which can cause corrosion or seizing. 
R 
R  - Can cause damage the mating surfaces. 
R 
R  - Can decrease the torque for the self-locking nuts. 
R
 Subtask 20-21-15-210-050
 C. Visual Inspection before Application of the Tightening Torque
 (1) Before you apply the tightening torque, make sure that: 
R  (a) The old identification mark (red mark) is removed (if painted). 
R  NOTE : You must not use the red mark as a visual reference for____ 
R  tightening of the fasteners. 
R  (b) The quality of the bolt and nut threads and of the lubrication is
 correct. 
R  (c) The tightening tools agree with the bolts and nuts. 
R  (d) The chamfer of the bolt is higher than or equal to the depth of
 the thread. 
R  (e) The terminals are flat and without burrs.
 Subtask 20-21-15-912-052
 D. Application of the Tightening Torque
 (1) Apply the tightening torques to the fasteners.
 (Ref. Fig. 201/TASK 20-21-15-991-001, 202/TASK 20-21-15-991-002,
 203/TASK 20-21-15-991-003, 204/TASK 20-21-15-991-004, 205/TASK 20-21-
15-991-005, 206/TASK 20-21-15-991-007, 207/TASK 20-21-15-991-008,
 208/TASK 20-21-15-991-009, 209/TASK 20-21-15-991-010)

 

 Tightening Torques for Electrical Components
 Figure 201/TASK 20-21-15-991-001
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 Tightening Torques for Electrical Components
 Figure 202/TASK 20-21-15-991-002
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 Tightening Torques for Electrical Components
 Figure 203/TASK 20-21-15-991-003
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 Tightening Torques for Electrical Components
 Figure 204/TASK 20-21-15-991-004
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 Tightening Torques for Electrical Components
 Figure 205/TASK 20-21-15-991-005
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R  Tightening Torques for Electrical Components Figure 206/TASK 20-21-15-991-007
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R  Tightening Torques for Electrical Components Figure 207/TASK 20-21-15-991-008
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 Tightening Torques for Electrical Components
 Figure 208/TASK 20-21-15-991-009
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 Tightening Torques for Electrical Components
 Figure 209/TASK 20-21-15-991-010
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 Subtask 20-21-15-210-051

 E. Visual Inspection after Application of the Torque.
 (1) After you apply the torque, make sure that:
 (a)
 The position of the assembled components has not changed.

 (b)
 The terminals are parallel.

 (c)
 The components are correctly locked.

 (d)
 You can see at least one thread and a half above the nut.

 (2) Apply the identification mark (red mark) if it is necessary.
 Subtask 20-21-15-912-053

 F. Marking of Screws and Nuts (identification mark)
 (1) After application of the tightening torque, on electrical connections held by a nut or a screw (except circuit-breakers) and made with cables with a cross-section of 5 mm2 or more (size 10 - 8 - 6, etc), you must make an identification mark (red painted line) between the
R nut or screw head and a fixed point using PAINTS FOR DETAIL (INTERNAL R AND EXTERN AL) (Material No. 07-020). (Ref. Fig. 210/TASK 20-21-15-991-011)
 NOTE : You must not use the red mark as a visual reference for
____ tightening of the screw or the nut. You must remove this mark before any operation on the connection. After an operation, you must tighten the screw or the nut to the applicable torque value and repaint the red mark.
　
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