1. Reason for the Job
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Locking is closely associated with safety and, therefore, must be accomplished according to the best shop practices. It must also counteract any untightening load acting on a component.
2. Job Set-up Information
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R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION R -------------------------------------------------------------------------------
R No specific Crimping tool R No specific Crimping Tool verification equipment R No specific Hydraulic tool
R B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP8001
Material No. CP8002
Material No. CP8004
Material No. CP8005
R Material No. CP8006
R
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lockwire 0.032 in. (0.8 mm) DIA. (Ref. 70-30-00)
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lockwire 0.032 in. (0.8 mm) DIA. (Ref. 70-30-00)
*
lockwire 0.024 in. (0.6 mm) DIA. (Ref. 70-30-00)
*
lockwire 0.024 in. (0.6 mm) DIA. (Ref. 70-30-00)
*
Safety cable (Ref. 70-30-00)
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R C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
70-22-00-991-300 Fig. 201
70-22-00-991-301 Fig. 202 R 70-22-00-991-302 Fig. 203 R 70-22-00-991-303 Fig. 204 R 70-22-00-991-304 Fig. 205 R 70-22-00-991-305 Fig. 206 R 70-22-00-991-306 Fig. 207 R 70-22-00-991-307 Fig. 208 R 70-22-00-991-308 Fig. 209
3. Job Set-up
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Subtask 70-22-00-869-051
A. Not Applicable.
4. Procedure
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Subtask 70-22-00-911-053
A. Self-locking, hexagonal and castellated nuts.
(Ref. Fig. 201/TASK 70-22-00-991-300)
(1) New or used nuts must be checked and meet the assembly specifications. Nuts that do not conform to the specifications must be discarded.
(2) Check that stud and bolt threads protrude through nuts by, at least, one thread (unless otherwise specified).
(3) Use a suitable torque wrench to apply the prescribed torque values.
Subtask 70-22-00-911-054
B. Cotter pins.
CAUTION : APPLIED TORQUE SHALL ALWAYS REMAIN WITHIN MINIMUM AND MAXIMUM
_______ SPECIFIED TORQUE VALUES. NEW COTTER PINS SHALL BE INSTALLED DURING EACH ASSEMBLY OPERATION.
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Castellated Nut and Cotter Pin Locking
Figure 201/TASK 70-22-00-991-300
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(1) After applying the minimum torque to a castellated nut, progressively tighten until one slot on the nut is brought in line with the hole provided for cotter pin.
(2) If alignment is not possible, unscrew the nut by one halfturn and repeat tightening.
(3) If correct alignment is still not possible, replace nut.
Subtask 70-22-00-911-055
C. Lockwire
(1) General Recommendations and Typical Locking Method. (Ref. Fig. 202/TASK 70-22-00-991-301)
(a) The lockwire must be fitted so that its tension increases if the locked component tends to loosen.
(b) Unless otherwise specified, lockwiring must be performed using lockwire 0.032 in. (0.8 mm) DIA. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) DIA. (Material No. CP8002) or lockwire 0.024 in. (0.6 mm) DIA. (Material No. CP8004) or lockwire 0.024 in. (0.6 mm) DIA. (Material No. CP8005).
(c) The lockwire is to be double twisted, without excessive tension. Do not exceed 15 turns per inch. Use special twisting pliers.
(d) The wire must be free of impact damage, folds or any other deterioration which could reduce locking efficiency.
R Subtask 70-22-00-911-059
R D. Safety cable
R (Ref. Fig. 203/TASK 70-22-00-991-302, 204/TASK 70-22-00-991-303, 205/TASK
R 70-22-00-991-304, 206/TASK 70-22-00-991-305, 207/TASK 70-22-00-991-306,
R 208/TASK 70-22-00-991-307, 209/TASK 70-22-00-991-308)
R CAUTION : SAFETY CABLE IS NOT REUSABLE. ALWAYS USE A NEW ONE. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM STANDARD PRACTICES - ENGINES(9)
