DOC AIRBUS | AMM A320FLocking Procedures [CFML]
TASK 70-24-00-910-815-A
Locking Procedures
1. Reason for the Job
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
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Referenced Information
3. Job Set-up
Subtask 70-24-00-869-055-A
Subtask 70-24-00-911-062-A
Safety cable is an alternative to safetywire unless specifically prohibited by the installation procedure. Safety cable is installed through two or more parts in such a way that as the fastener or part loosens the safety cable will tighten. When the safety cable tightens it will not permit the fastener or part to turn.
The cable process uses two parts:
(2)CP8006 safety cable 0.032 in. (0.8 mm) dia.
When the safety cable is installed the ferrule will be crimped on the open end of the cable.
(3) The hand operated crimping tool comes in different lenghts. The crimping pressure of the tool is set by the manufacturer. The primary parts of the crimping tool are the crimping head, tensioning wheel, slotted wheel and handles. This tool is used to crimp the ferrule on the end of the safety cable. The CRIMPING TOOL 46447 will cut the safety cable even with the ferrule at the same time the ferrule is crimped.
(4) The AIR, HYDRAULIC TOOL KIT - ALL FLUID operates in one direction only and has a cycle end dead stop to tell the operator when the ferrule is fully crimped. The crimping pressure of the tool is set by the manufacturer. If necessary, the crimping pressure can be adjusted with standard hand tools. The snap-on tool has a spring loaded crimp rod to hold the ferrule in place during the crimping procedure. Cable tension is done automatically by the internal retraction mechanism.
(5) Bergen process (Safety cable)
(b) In all cases, safety cable must be installed through the holes provised. When no holes is provided, attach the safety cable to a neighboring part so as not to interfere with the function of the parts, and in accordance with the recommendations.
(c) The maximum span of safety cable cable between tension points shall be 6 in. (152.4 mm), unless otherwise specified. Where several fasteners form a group to be safetywired together, the maximum number of units in a series shall be limited to the number of units that can be safetywired by a 24 in. (609.6 mm) length of cable.
(d) Tools and Equipements
(6) Procedure for safety cable process
Unless specified differently in the engine manual:
1 The maximum length of the safety cable between cabled parts is 6.0 in. (152.4 mm).
2 Do not safety more than three bolts with one safety cable.
3 Do not use safety cable on titanium fasteners.
(c) Introduce the ferrule into the cable. (Detail2)
(d) Tighten the cable by putting the head of the tool in contact with the last bolt head to be wired. (Detail4)
(e) Activate the tool to tighten the assembly to the correct tension and automatically crimp the ferrule at the same time. (Detail7)
(f) Snip off the excess wire. The overlap must not exceed 0.06 in. (1.5240 mm). (Detail 5)
and (Detail6)
(g) No notches or no frays are admitted.
(7) Verification with CRIMP VERIFICATION EQUIPMENT
(a) Do a pulloff load test as often as necessary to make sure the crimp done by the crimping tool meets the necessary requirements. CFMI recommends the pulloff load test be done at the beggining, middle and end of each shift. Do a pulloff load test as follows:
1 If the test block is not already set up, set it up at this time. Refer to manufacturer's instructions for set up information.
2 Make sure the pivot joint is in the forward direction.
3 Move the cable stop at the end of the test block. Install the safety cable through the hole that was covered by the cable stop. Pull the safety cable through the hole in the safety block and then put it through the hole in the pivot joint. Pull the cable through the hole in the pivot joint.
4 Perform the process of paragraph D.(6).
5 Find the center of the safety cable in the test block. Use light finger pressure and push the center of the safety cable toward the wall on the test block. The safety cable must not touch the wall.
6 If the safety cable touches the wall, the safety cable is not serviceable. Cut and remove the safety cable from the test block. Install a new safety cable and do the pulloff load test again. If the cable touches the wall again, remove the crimping tool from service.
7 Move the torque wrench handle counter-clockwise until the torque wrench clicks or the ferrules moves. If the ferrule moves before you hear the torque wrench click, remove the crimping tool from service.
8 Find the center of the safety cable in the test block. Use light finger pressure and push the center of the safety cable toward the wall on the test block. If the safety cable does not touch the wall the crimping tool can be release for service.
9 If the safety cable touches the wall, the safety cable is not serviceable. Cut and remove the safety cable from the block test. Do the pulloff load test again with a new cable. If the new safety cable is unserviceable, remove the crimping tool from service.
(b) Do a test to determine the exact amount of pressure necessary to cause the crimped ferrule or safety cable to fail. It is recommended that this test be done a minimum of once a mounth. Use a safety cable tester to do this test. Do this test according to the manufacturer's instructions. This test can also be used as an alternative to the test block test.
[Rev.10 from 2021]
2026.04.01 02:20:49 UTC
Locking Procedures
1. Reason for the Job
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
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | AIR, HYDRAULIC TOOL KIT - ALL FLUID |
| No specific | 1 | CRIMP VERIFICATION EQUIPMENT |
| No specific | 1 | CRIMPING TOOL 46447 |
| No specific | 1 | CRIMPING TOOL BERGEN C10-148 |
| No specific | 1 | CRIMPING TOOL SNAP-ON C10-148 |
| No specific | 1 | CUTTER C10-149 - WIRE, SIDE CUSHIONED |
| No specific | 1 | TEST BLOCK SAFETY CABLE |
| No specific | 1 | TESTER SAFETY CABLE |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP8001) | lockwire 0.032 in. (0.8 mm) dia. |
| (Material No.CP8002) | lockwire 0.032 in. (0.8 mm) dia |
| (Material No.CP8004) | lockwire 0.6 mm (0.0236 in.) dia |
| (Material No.CP8005) | lockwire 0.6 mm (0.0236 in.) dia |
| (Material No.CP8006) | safety cable 0.032 in. (0.8 mm) dia. |
| REFERENCE | DESIGNATION |
|---|---|
Castellated Nut and Cotter Pin LockingSubtask 70-24-00-869-055-A
A. Not Applicable.
4. ProcedureSubtask 70-24-00-911-062-A
A. Self-locking, hexagonal and castellated nuts.
(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 70-24-00-911-063-A (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.
B. Cotter pins.
(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 70-24-00-911-064-A CAUTION:
APPLIED TORQUE SHALL ALWAYS REMAIN WITHIN MINIMUM AND MAXIMUM SPECIFIED TORQUE VALUES. NEW COTTER PINS SHALL BE INSTALLED DURING EACH ASSEMBLY OPERATION.
(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.
C. Lockwire
(1) General Recommendations and Typical Locking Method.
(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 usingCP8001 lockwire 0.032 in. (0.8 mm) dia. CP8002 lockwire 0.032 in. (0.8 mm) dia CP8004 lockwire 0.6 mm (0.0236 in.) dia CP8005 lockwire 0.6 mm (0.0236 in.) dia
(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.
Subtask 70-24-00-911-065-A (1) General Recommendations and Typical Locking Method.
(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
(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.
CAUTION:
SAFETY CABLE IS NOT REUSABLE. ALWAYS USE A NEW ONE.
D. Safety cable Safety cable is an alternative to safetywire unless specifically prohibited by the installation procedure. Safety cable is installed through two or more parts in such a way that as the fastener or part loosens the safety cable will tighten. When the safety cable tightens it will not permit the fastener or part to turn.
The cable process uses two parts:
- a cable with a fitting already crimped to one end,
- a ferrule to set.
(2)
When the safety cable is installed the ferrule will be crimped on the open end of the cable.
(3) The hand operated crimping tool comes in different lenghts. The crimping pressure of the tool is set by the manufacturer. The primary parts of the crimping tool are the crimping head, tensioning wheel, slotted wheel and handles. This tool is used to crimp the ferrule on the end of the safety cable. The CRIMPING TOOL 46447 will cut the safety cable even with the ferrule at the same time the ferrule is crimped.
(4) The AIR, HYDRAULIC TOOL KIT - ALL FLUID operates in one direction only and has a cycle end dead stop to tell the operator when the ferrule is fully crimped. The crimping pressure of the tool is set by the manufacturer. If necessary, the crimping pressure can be adjusted with standard hand tools. The snap-on tool has a spring loaded crimp rod to hold the ferrule in place during the crimping procedure. Cable tension is done automatically by the internal retraction mechanism.
(5) Bergen process (Safety cable)
CAUTION:
DO NOT USE SAFETY CABLE IF THE HOLES ARE MORE THAN 0.100 INCH (2.54 MM) DIAMETER. IF YOU DO, THE FERRULES ON THE END OF THE CABLE WILL PULL THROUGH THE LARGER HOLES.
CAUTION:
SAFETY CABLE MUST NOT BE USED INSIDE OIL SUMPS OF ENGINE (FWD AND AFT) AND INSIDE AGB AND TGB CONTAINING BEARINGS AND GEARS.
(a) Do not install safety cable in such a way as to cause the wire to be subjected to chafing, fatique through vibration, or additional tension other than the tension imposed on the wire to prevent disengagement. (b) In all cases, safety cable must be installed through the holes provised. When no holes is provided, attach the safety cable to a neighboring part so as not to interfere with the function of the parts, and in accordance with the recommendations.
(c) The maximum span of safety cable cable between tension points shall be 6 in. (152.4 mm), unless otherwise specified. Where several fasteners form a group to be safetywired together, the maximum number of units in a series shall be limited to the number of units that can be safetywired by a 24 in. (609.6 mm) length of cable.
(d) Tools and Equipements
- TEST BLOCK SAFETY CABLE
- TESTER SAFETY CABLE
- CRIMPING TOOL BERGEN C10-148 or CRIMPING TOOL SNAP-ON C10-148
- CUTTER C10-149 - WIRE, SIDE CUSHIONED
| Ref. No. | SUPPLIER | DESCRIPTION |
|---|---|---|
| CP8006 | BERGEN | Ferrule, Safety Cable (0.032 in. dia.) |
| CP8006 | DANIELS | Ferrule, Safety Cable (0.032 in. dia.) |
| CP8006 | BERGEN | Safety Cable (0.032 in. dia.) |
| CP8006 | DANIELS | Safety Cable (0.032 in. dia.) |
CAUTION:
SAFETY CABLE MUST NOT BE USED INSIDE OIL SUMPS OF ENGINE (FWD AND AFT) AND INSIDE AGB AND TGB CONTAINING BEARINGS AND GEARS.
CAUTION:
SAFETY CABLE IS NOT REUSABLE. ALWAYS USE A NEW ONE.
(a) Check the safety cable holes of the parts to be secured for proper alignment. If a part has been tightened to the proper torque, but is impropertly aligned, replace it with another part. Unless specified differently in the engine manual:
1 The maximum length of the safety cable between cabled parts is 6.0 in. (152.4 mm).
2 Do not safety more than three bolts with one safety cable.
3 Do not use safety cable on titanium fasteners.
NOTE: Proper alignment means that the safety cables holes are aligned so that the installed safety cable will prevent disengagement of the part. Do not exceed torque limits of any part in an attempt to align the holes.
(b) Introduce the cable through parts to be secured. (Detail 1) (c) Introduce the ferrule into the cable. (Detail2)
(d) Tighten the cable by putting the head of the tool in contact with the last bolt head to be wired. (Detail4)
(e) Activate the tool to tighten the assembly to the correct tension and automatically crimp the ferrule at the same time. (Detail7)
(f) Snip off the excess wire. The overlap must not exceed 0.06 in. (1.5240 mm). (Detail 5)
and (Detail6)
(g) No notches or no frays are admitted.
(7) Verification with CRIMP VERIFICATION EQUIPMENT
(a) Do a pulloff load test as often as necessary to make sure the crimp done by the crimping tool meets the necessary requirements. CFMI recommends the pulloff load test be done at the beggining, middle and end of each shift. Do a pulloff load test as follows:
1 If the test block is not already set up, set it up at this time. Refer to manufacturer's instructions for set up information.
2 Make sure the pivot joint is in the forward direction.
3 Move the cable stop at the end of the test block. Install the safety cable through the hole that was covered by the cable stop. Pull the safety cable through the hole in the safety block and then put it through the hole in the pivot joint. Pull the cable through the hole in the pivot joint.
4 Perform the process of paragraph D.(6).
5 Find the center of the safety cable in the test block. Use light finger pressure and push the center of the safety cable toward the wall on the test block. The safety cable must not touch the wall.
6 If the safety cable touches the wall, the safety cable is not serviceable. Cut and remove the safety cable from the test block. Install a new safety cable and do the pulloff load test again. If the cable touches the wall again, remove the crimping tool from service.
7 Move the torque wrench handle counter-clockwise until the torque wrench clicks or the ferrules moves. If the ferrule moves before you hear the torque wrench click, remove the crimping tool from service.
8 Find the center of the safety cable in the test block. Use light finger pressure and push the center of the safety cable toward the wall on the test block. If the safety cable does not touch the wall the crimping tool can be release for service.
9 If the safety cable touches the wall, the safety cable is not serviceable. Cut and remove the safety cable from the block test. Do the pulloff load test again with a new cable. If the new safety cable is unserviceable, remove the crimping tool from service.
(b) Do a test to determine the exact amount of pressure necessary to cause the crimped ferrule or safety cable to fail. It is recommended that this test be done a minimum of once a mounth. Use a safety cable tester to do this test. Do this test according to the manufacturer's instructions. This test can also be used as an alternative to the test block test.