DOC AIRBUS | AMM A320FReplacement of the Ring-Locked Self-Locking Insert [CFML]
TASK 70-28-00-300-802-A
Replacement of the Ring-Locked Self-Locking Insert
This procedure provides the instructions for the replacement of the ring-locked self-locking insert.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 70-28-00-860-057-A
Subtask 70-28-00-350-051-A
[Rev.10 from 2021]
2026.04.01 02:21:00 UTC
Replacement of the Ring-Locked Self-Locking Insert
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING:
YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobThis procedure provides the instructions for the replacement of the ring-locked self-locking insert.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY |
| No specific | 1 | HAMMER - NON METALLIC |
| No specific | 1 | MAGNIFYING GLASS POWER 10X |
| No specific | 1 | PUNCH - POINTED |
| No specific | 1 | VACUUM CLEANER |
| No specific | 1 | WRENCH - TORQUE |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP2233) | 3M-250 |
| (Material No.CP2442) | engine oil |
| (Material No.CP2970) | aeroshell turbine oil 308 |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
Individual Insert and Locking RingSubtask 70-28-00-860-057-A
A. Equipment
4. ProcedureNOTE: You can use equivalent alternatives for tools, equipment and consumable materials, however the repair source must demonstrate and document equivalency.
Reference: - Drive tool
- Swage tool
- Hexagonal head drive
- Wrenches (Allen keys)
- Pointed punch
- Shop vacuum
- 0.3125-24 UNJF-3B tap
- 0.375-24 UNJF-3B tap
- 0.4375-20 UNJF-3B tap
- Bolt-Inconel 718 (bolt thread 0.2500-28 UNJF-3A, pitch diameter between 0.2243 in. (5.697 mm) and 0.2251 in. (5.718 mm))
- Bolt-Inconel 718 (bolt thread 0.3125-24 UNJF-3A, pitch diameter between 0.2827 in. (7.181 mm) and 0.2836 in. (7.203 mm) (standard bolt 0.3125-24))
- Bolt-Inconel 718 (bolt thread 0.375-24 UNJF-3A, pitch diameter between 0.3450 in. (8.763 mm) and 0.3460 in. (8.788 mm) (standard bolt 0.375-24))
- 0.250 in. (6.35 mm) heavy-duty flat washer with 0.063 in. (1.60 mm) minimum thickness x 0.50 in. (12.7 mm) minimum outer diameter
- 0.3125 in. (7.937 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness x 0.62 in. (15.7 mm) minimum outer diameter
- 0.375 in. (9.52 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness x 0.75 in. (19.0 mm) minimum outer diameter.
Subtask 70-28-00-350-051-A
A. Removal of the Ring-Locked Self-Locking Insert
(2) Remove the unserviceable threaded insert and the locking ring from the assembly as follows:
(a) To prevent contamination, use a plug or a 3M-250 (Material No.CP2233) to seal each opening in the assembly or other means such as a vacuum to protect the assembly from contamination.
(b) Using a drill stop collar to drill the assembly to a depth of 0.090 in. (2.29 mm) or less.
1 Using a VACUUM CLEANER during the drilling procedure is recommended to reduce the possibility of metal particles contaminating the assembly.
(c) Drilling:
1 Put the PUNCH - POINTED on one end of the locking ring and use a HAMMER - NON METALLIC to tap the PUNCH - POINTED lightly.
2 Carefully lift the locking ring from the oval-shaped counterbore hole.
(e) Use the correctly-sized Allen key to remove the damaged insert.
1 The damaged insert cannot be used again and should be discarded.
(f) Remove all unwanted material from the assembly repair area.
(3) Do a visual inspection of the threads in the assembly repair area.
(a) If necessary, remove the high metal from the threaded hole using a tap to chase the threads.
(b) Use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to remove the loose metal chips from the tapped hole.
(c) After chasing the threads, if you find damage on more than the first thread, this part cannot be repaired by this procedure.
(4) Blend the counterbore and countersink by hand to remove the high metal, refer to LEAPSPM 704111 .
(a) Use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to remove the loose metal chips from the tapped hole.
(b) Do a dimensional inspection of the counterbore.
1 If the dimensions do not agree with the limits, you cannot repair the assembly by this procedure.
(c) Do an inspection of the threads in the hole that is being repaired and do as follows:
1 If the threads are not serviceable, you cannot repair the assembly with this procedure.
Subtask 70-28-00-350-052-A NOTE: You can replace the insert without damage to the threads of the parent material. The ring-locked self-locking insert uses an oval-shaped ring with serrations to tighten and lock the insert in its position.
NOTE: The individual insert and the locking ring make up the insert/locking ring kit that is supplied for the repair.
(1) If necessary, clean the work area before you attempt any repairs to prevent contamination of the assembly. (2) Remove the unserviceable threaded insert and the locking ring from the assembly as follows:
(a) To prevent contamination, use a plug or a 3M-250 (Material No.CP2233) to seal each opening in the assembly or other means such as a vacuum to protect the assembly from contamination.
(b) Using a drill stop collar to drill the assembly to a depth of 0.090 in. (2.29 mm) or less.
1 Using a VACUUM CLEANER during the drilling procedure is recommended to reduce the possibility of metal particles contaminating the assembly.
(c) Drilling:
WARNING:
USE PERSONAL PROTECTION EQUIPMENT. METAL PARTICLES CAN CAUSE DAMAGE, INJURY OR IRRITATION.
CAUTION:
DURING THE DRILLING PROCEDURE, OBEY THESE INSTRUCTIONS:
1 Align the drill with the center line of the damaged insert and obey the instructions that follow: - MAKE SURE THAT THE ASSEMBLY DOES NOT MOVE
- DO NOT DRILL INTO THE ASSEMBLY PARENT MATERIAL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, DAMAGE TO THE ASSEMBLY WILL OCCUR.
- Drill into the insert to a depth of 0.090 in. (2.29 mm) or less.
- Make sure that you do not drill into the parent material.
1 Put the PUNCH - POINTED on one end of the locking ring and use a HAMMER - NON METALLIC to tap the PUNCH - POINTED lightly.
2 Carefully lift the locking ring from the oval-shaped counterbore hole.
(e) Use the correctly-sized Allen key to remove the damaged insert.
1 The damaged insert cannot be used again and should be discarded.
(f) Remove all unwanted material from the assembly repair area.
(3) Do a visual inspection of the threads in the assembly repair area.
(a) If necessary, remove the high metal from the threaded hole using a tap to chase the threads.
(b) Use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to remove the loose metal chips from the tapped hole.
(c) After chasing the threads, if you find damage on more than the first thread, this part cannot be repaired by this procedure.
(4) Blend the counterbore and countersink by hand to remove the high metal, refer to LEAP
NOTE: The full removal of the high metal from the counterbore and countersink will decrease the risk of interference in the locking ring installation and will prevent further removal of the locking ring.
NOTE: Refer to the applicable process document to determine if a fluorescent penetrant inspection is required after the blending.
WARNING:
WHEN YOU USE COMPRESSED AIR:
(5) - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
- DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).
(a) Use AIR SOURCE 2 BAR (30 PSI) - REGULATED, FILTERED, DRY to remove the loose metal chips from the tapped hole.
(b) Do a dimensional inspection of the counterbore.
1 If the dimensions do not agree with the limits, you cannot repair the assembly by this procedure.
(c) Do an inspection of the threads in the hole that is being repaired and do as follows:
1 If the threads are not serviceable, you cannot repair the assembly with this procedure.
B. Installation of the Ring-Locked Self-Locking Insert
(a) Make sure that you remove all unwanted material from the threaded hole and the counterbore before you install the new screw insert and the locking ring.
(b) Use an insert of the same size as the damaged screw insert that you removed.
(c) Install the new insert into the threaded hole of the assembly as follows:
1 Put the insert into the threaded hole.
3 Install the insert in the case until the top face of the insert is between 0.01 in. (0.25 mm) and 0.03 in. (0.76 mm) below the assembly surface.
(2) Install the new locking ring on the insert and into the oval-shaped hole of the assembly:
(a) The word TOP on the locking ring must face out from the assembly.
(b) Align the serrations on the insert with the serrations of the locking ring.
(3) Swage the new insert into the locking ring as follows:
(a) Make a swage tool to meet the dimension requirements.
(b) Put the swage tool into the screw insert and the locking ring.
(c) Push the locking ring to make sure that it makes contact with the bottom of the counterbore.
(d) Use a HAMMER - NON METALLIC to tap the swage tool until the nylon stop washer of the swage tool touches the pad on the assembly.
(4) Remove the swage tool.
(5) Do an inspection of the insert and the locking ring as follows:
(a) Use MAGNIFYING GLASS POWER 10X.
(b) Make sure that the insert serrations are swaged into the serrations of the locking ring.
(c) Make sure that the locking ring is at a minimum of 0.002 in. (0.05 mm) below the assembly surface.
(d) Use a PUNCH - POINTED to try to lift the locking ring with light hand pressure on the PUNCH - POINTED, and make sure that the locking ring does not lift out of the counterbore.
(6) Install and remove of the thin wall, self-locking, short and long length inserts, as follows:
(b) For insert 1693M83P12, put a 0.375 in. (9.52 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.75 in. (19.05 mm) minimum outer diameter on a 0.375-24 UNJF-3A bolt.
(c) For insert 1693M83P13, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(d) For insert 1693M83P14, put a 0.375 in. (9.52 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.75 in. (19.05 mm) minimum outer diameter on a 0.375-24 UNJF-3A bolt.
(e) For insert 1693M83P15, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(f) For insert 1693M83P17, put a 0.3125 in. (7.94 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.62 in. (15.75 mm) minimum outer diameter on a 0.3125-24 UNJF-3A bolt.
(g) For insert 1693M83P18, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(h) For insert 1693M83P19, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(i) Put the bolt and the flat washer in the insert.
(j) Use a WRENCH - TORQUE to measure the torque of the insert.
(k) Make sure that the torque range is as follows (the locking ring may rotate within the counterbore as long as the torque range is met):
1 For insert 1693M83P12, the minimum torque should be 14.2 lbf.in (0.16 m.daN) and the maximum torque should be 80 lbf.in (0.90 m.daN).
2 For insert 1693M83P13, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30 lbf.in (0.34 m.daN).
3 For insert 1693M83P14, the minimum torque should be 14.2 lbf.in (0.16 m.daN) and the maximum torque should be 80 lbf.in (0.90 m.daN).
4 For insert 1693M83P15, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
5 For insert 1693M83P17, the minimum torque should be 9.7 lbf.in (0.11 m.daN) and the maximum torque should be 60.0 lbf.in (0.68 m.daN).
6 For insert 1693M83P18, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
7 For insert 1693M83P19, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
(l) Remove the bolt and the flat washer from the insert.
(7) Remove the items that follow:
NOTE: You can replace the insert without damage to the threads of the parent material. The ring-locked self-locking insert uses an oval-shaped ring with serrations to tighten and lock the insert in its position.
(1) Install the new insert and the new locking ring in the assembly: (a) Make sure that you remove all unwanted material from the threaded hole and the counterbore before you install the new screw insert and the locking ring.
(b) Use an insert of the same size as the damaged screw insert that you removed.
(c) Install the new insert into the threaded hole of the assembly as follows:
1 Put the insert into the threaded hole.
- The use of the engine oil (Material No.CP2442) or the aeroshell turbine oil 308 (Material No.CP2970) is permitted.
3 Install the insert in the case until the top face of the insert is between 0.01 in. (0.25 mm) and 0.03 in. (0.76 mm) below the assembly surface.
(2) Install the new locking ring on the insert and into the oval-shaped hole of the assembly:
(a) The word TOP on the locking ring must face out from the assembly.
(b) Align the serrations on the insert with the serrations of the locking ring.
(3) Swage the new insert into the locking ring as follows:
(a) Make a swage tool to meet the dimension requirements.
(b) Put the swage tool into the screw insert and the locking ring.
(c) Push the locking ring to make sure that it makes contact with the bottom of the counterbore.
(d) Use a HAMMER - NON METALLIC to tap the swage tool until the nylon stop washer of the swage tool touches the pad on the assembly.
(4) Remove the swage tool.
(5) Do an inspection of the insert and the locking ring as follows:
(a) Use MAGNIFYING GLASS POWER 10X.
(b) Make sure that the insert serrations are swaged into the serrations of the locking ring.
(c) Make sure that the locking ring is at a minimum of 0.002 in. (0.05 mm) below the assembly surface.
(d) Use a PUNCH - POINTED to try to lift the locking ring with light hand pressure on the PUNCH - POINTED, and make sure that the locking ring does not lift out of the counterbore.
(6) Install and remove of the thin wall, self-locking, short and long length inserts, as follows:
CAUTION:
WHEN YOU DO A CHECK OF THE MINIMUM LOCKING TORQUE, DO NOT CONTINUE TO SCREW THE STANDARD BOLT THROUGH THE SCREW INSERT. IF YOU DO, DAMAGE TO THE ASSEMBLY CAN OCCUR.
(a) (b) For insert 1693M83P12, put a 0.375 in. (9.52 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.75 in. (19.05 mm) minimum outer diameter on a 0.375-24 UNJF-3A bolt.
(c) For insert 1693M83P13, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(d) For insert 1693M83P14, put a 0.375 in. (9.52 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.75 in. (19.05 mm) minimum outer diameter on a 0.375-24 UNJF-3A bolt.
(e) For insert 1693M83P15, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(f) For insert 1693M83P17, put a 0.3125 in. (7.94 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.62 in. (15.75 mm) minimum outer diameter on a 0.3125-24 UNJF-3A bolt.
(g) For insert 1693M83P18, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(h) For insert 1693M83P19, put a 0.250 in. (6.35 mm) heavy-duty flat washer with 0.060 in. (1.52 mm) minimum thickness by 0.50 in. (12.70 mm) minimum outer diameter on a 0.250-28 UNJF-3A bolt.
(i) Put the bolt and the flat washer in the insert.
(j) Use a WRENCH - TORQUE to measure the torque of the insert.
(k) Make sure that the torque range is as follows (the locking ring may rotate within the counterbore as long as the torque range is met):
1 For insert 1693M83P12, the minimum torque should be 14.2 lbf.in (0.16 m.daN) and the maximum torque should be 80 lbf.in (0.90 m.daN).
2 For insert 1693M83P13, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30 lbf.in (0.34 m.daN).
3 For insert 1693M83P14, the minimum torque should be 14.2 lbf.in (0.16 m.daN) and the maximum torque should be 80 lbf.in (0.90 m.daN).
4 For insert 1693M83P15, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
5 For insert 1693M83P17, the minimum torque should be 9.7 lbf.in (0.11 m.daN) and the maximum torque should be 60.0 lbf.in (0.68 m.daN).
6 For insert 1693M83P18, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
7 For insert 1693M83P19, the minimum torque should be 5.3 lbf.in (0.06 m.daN) and the maximum torque should be 30.0 lbf.in (0.34 m.daN).
(l) Remove the bolt and the flat washer from the insert.
(7) Remove the items that follow:
CAUTION:
MAKE SURE THAT UNWANTED MATERIAL DOES NOT FALL INTO THE ASSEMBLY. DAMAGE TO THE ASSEMBLY CAN OCCUR.
(a) Remove any masking tape, plugs or other means that were used to prevent the assembly contamination.