DOC AIRBUS | AMM A320FReplace the Helical Coil Insert or Repair with Oversized Inserts on the Turbine Exhaust Case, Repair - VRS3014 [IAE]
TASK 72-50-00-300-802-A
Replace the Helical Coil Insert or Repair with Oversized Inserts on the Turbine Exhaust Case, Repair - VRS3014
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 72-50-00-860-050-A ** ON A/C NOT FOR ALL
Subtask 72-50-00-020-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:01:21 UTC
Replace the Helical Coil Insert or Repair with Oversized Inserts on the Turbine Exhaust Case, Repair - VRS3014
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | GAGE - THREAD (0.2500 IN - 28 THD/IN) |
| No specific | 1 | TAP PLUG - HELICOIL - BOTTOM TWINSERT 1/4-28 |
| 1227-6 | 1 | EXTRACTING TOOL |
| 1927-4 | 1 | THREAD PLUG GAGE |
| 3695-4 | 2 | INSERT TANG REMOVAL TOOL |
| 4FPB | 1 | TAP, PLUG - HELICOIL |
| 7552-4 | 1 | INSERT INSTALLATION TOOL |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-23-05-230-010-A | Local Application of Fluorescent Penetrant Inspection |
| TASK 70-35-08-300-010-A | Install and Repair Wire Thread Inserts |
| TASK 72-50-00-200-010-A | Inspection of the Turbine Exhaust Case |
Subtask 72-50-00-860-050-A ** ON A/C NOT FOR ALL
A. Not Applicable
4. ProcedureSubtask 72-50-00-020-053-A ** ON A/C NOT FOR ALL
A. Removal of the Inserts from the Turbine Exhaust Case
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(1) Remove loose or damaged inserts from the turbine exhaust case.
(a) Use 1227-6 EXTRACTING TOOL (Ref. AMM TASK 70-35-08-300-010).
Subtask 72-50-00-210-057-A ** ON A/C NOT FOR ALL No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL (a) Use 1227-6 EXTRACTING TOOL (Ref. AMM TASK 70-35-08-300-010).
B. Examine the Threads
(1) Examine the threads after you remove the insert.
(a) Use the GAGE - THREAD (0.2500 IN - 28 THD/IN) for single helical coil or the 1927-4 THREAD PLUG GAGE for double helical coil.
1 If the threads are damaged, do a single helical coil insert repair by Steps C., D., E., F. and J.
2 If the hole threads are not damaged, replace the single helical coil by Steps D., F. and J.
3 If the hole threads are damaged more than the limits of a single helical coil insert, do a double helical coil insert repair by Steps C., D., E., G., H. and J.
(2) Do a dimensional inspection of the repair area at the turbine exhaust case to make sure that there is sufficient minimum wall thickness for machining.
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
Subtask 72-50-00-320-050-A ** ON A/C NOT FOR ALL (1) Examine the threads after you remove the insert.
(a) Use the GAGE - THREAD (0.2500 IN - 28 THD/IN) for single helical coil or the 1927-4 THREAD PLUG GAGE for double helical coil.
1 If the threads are damaged, do a single helical coil insert repair by Steps C., D., E., F. and J.
2 If the hole threads are not damaged, replace the single helical coil by Steps D., F. and J.
3 If the hole threads are damaged more than the limits of a single helical coil insert, do a double helical coil insert repair by Steps C., D., E., G., H. and J.
(2) Do a dimensional inspection of the repair area at the turbine exhaust case to make sure that there is sufficient minimum wall thickness for machining.
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL NOTE: If the hole is already tapped for a double helical wire thread insert, it is permitted to install a double helical coil thread insert by steps D., G., H. and J. subject to part meeting minimum wall thickness requirement.
C. Machining of the Damaged Threads
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(2) Machine the lead-in chamfer.
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(3) Tap the hole and remove the chips.
(a) Use the 4FPB TAP, PLUG - HELICOIL for single helical coil insert or the TAP PLUG - HELICOIL - BOTTOM TWINSERT 1/4-28 for double helical coil insert.
Subtask 72-50-00-230-051-A ** ON A/C NOT FOR ALL No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL WARNING:
WHEN YOU REPAIR THE HOLE:
(1) Machine the damaged threads to the required thread minor diameter. - DO NOT DRILL OR TAP INTO THE CASE WALL
- DO NOT DECREASE THE WALL THICKNESS OF THE BOSSES TO LESS THAN THE LIMITS GIVEN FOR THE MINOR DIAMETER OF THE THREADS ON FIGURES 801 AND 802.
(2) Machine the lead-in chamfer.
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL (a) Use the 4FPB TAP, PLUG - HELICOIL for single helical coil insert or the TAP PLUG - HELICOIL - BOTTOM TWINSERT 1/4-28 for double helical coil insert.
D. Do a fluorescent penetrant inspection on the repaired area (Ref. AMM TASK 70-23-05-230-010).
Subtask 72-50-00-210-058-A ** ON A/C NOT FOR ALL E. Examine the threads
(1) Examine the threads after you have tapped them.
(a) Use the GAGE - THREAD (0.2500 IN - 28 THD/IN) or the 1927-4 THREAD PLUG GAGE.
Subtask 72-50-00-420-059-A ** ON A/C NOT FOR ALL (1) Examine the threads after you have tapped them.
(a) Use the GAGE - THREAD (0.2500 IN - 28 THD/IN) or the 1927-4 THREAD PLUG GAGE.
F. Installation of the New Single Helical Coil Inserts
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(1) Put the insert (PN MS21209F4-15) onto the tip of the 7552-4 INSERT INSTALLATION TOOL.
(2) Put the insert into the threaded hole.
(3) Turn the handle clockwise so the top of the insert is one to one and a half pitch below the face of the boss.
(4) Break the tang of the insert at the notch with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
Subtask 72-50-00-420-060-A ** ON A/C NOT FOR ALL No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL (2) Put the insert into the threaded hole.
(3) Turn the handle clockwise so the top of the insert is one to one and a half pitch below the face of the boss.
(4) Break the tang of the insert at the notch with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
G. Installation of the Outer Double Helical Coil Inserts
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(1) Put the outer insert (PN 2391-4CN375) onto the tip of the 7552-4 INSERT INSTALLATION TOOL.
(2) Put the insert into the threaded hole.
(3) Turn the handle clockwise so the top of the insert is one to one and a half pitch below the face of the boss.
(4) Break off and remove tang with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
Subtask 72-50-00-420-061-A ** ON A/C NOT FOR ALL No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL (2) Put the insert into the threaded hole.
(3) Turn the handle clockwise so the top of the insert is one to one and a half pitch below the face of the boss.
(4) Break off and remove tang with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
H. Installation of the Inner Double Helical Coil Inserts
No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL
(1) Put the insert (PN 4691-4CN339) onto the tip of the 7552-4 INSERT INSTALLATION TOOL.
(2) Put the insert into the threaded hole.
(3) Align the ends of the inner insert and the outer insert.
(4) Break off and remove tang with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
Subtask 72-50-00-210-059-A ** ON A/C NOT FOR ALL No. 5 Bearing Housing Single and Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL No. 5 Bearing Housing Double Helical Coil Inserts Repair on the Turbine Exhaust Case Assembly ** ON A/C NOT FOR ALL (2) Put the insert into the threaded hole.
(3) Align the ends of the inner insert and the outer insert.
(4) Break off and remove tang with the 3695-4 INSERT TANG REMOVAL TOOL (Ref. AMM TASK 70-35-08-300-010).
I. Examine the Repair
(1) Inspect the turbine exhaust case after repair (Ref. AMM TASK 72-50-00-200-010).
(1) Inspect the turbine exhaust case after repair (Ref. AMM TASK 72-50-00-200-010).