DOC AIRBUS | AMM A320FReplacement of the Stage 1 Fan Disk Shank Nut - VRS1174 [IAE]
TASK 72-31-12-300-020-A
Replacement of the Stage 1 Fan Disk Shank Nut - VRS1174
1. Reason for the Job
This Task is for V2500-ALL engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 72-31-12-941-056-A ** ON A/C NOT FOR ALL
Subtask 72-31-12-020-054-B ** ON A/C NOT FOR ALL
Subtask 72-31-12-942-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:01:01 UTC
Replacement of the Stage 1 Fan Disk Shank Nut - VRS1174
1. Reason for the Job
This Task is for V2500-ALL engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | MAT - WORK |
| No specific | AR | PEENING TOOL |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-31-11-000-010-B | Removal of the LP Compressor Fan Blades |
| TASK 72-31-11-400-010-C | Installation of the LP Compressor Fan Blades |
Replacement of the Stage 1 Fan Disk Shank NutSubtask 72-31-12-941-056-A ** ON A/C NOT FOR ALL
A. On the panel 115VU
(1) Put WARNING NOTICE(S) to tell persons not to start the engine 1 (2).
Subtask 72-31-12-869-053-A ** ON A/C NOT FOR ALL (1) Put WARNING NOTICE(S) to tell persons not to start the engine 1 (2).
B. Make sure that the engine 1 (2) has been shutdown for at least five minutes.
Subtask 72-31-12-869-054-A ** ON A/C NOT FOR ALL C. On the panel 50VU
(1) Make sure that the ON Legend of the ENG FADEC GND PWR pushbutton switch if off.
(2) Install the WARNING NOTICE(S).
Subtask 72-31-12-941-057-A ** ON A/C NOT FOR ALL (1) Make sure that the ON Legend of the ENG FADEC GND PWR pushbutton switch if off.
(2) Install the WARNING NOTICE(S).
D. Install the support equipment
(1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the engine for the repair.
(2) Put the MAT - WORK into position in the air intake cowl.
4. Procedure(1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the engine for the repair.
(2) Put the MAT - WORK into position in the air intake cowl.
NOTE: Make sure that the red warning pennants of the workmat can be seen external to the aircraft. Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the air intake cowl.
Subtask 72-31-12-020-054-B ** ON A/C NOT FOR ALL
A. Remove the stage 1 fan blade from the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-000-010).
Subtask 72-31-12-350-053-A ** ON A/C NOT FOR ALL B. Remove the damaged shank nuts of the stage 1 fan disk assembly
(2) Write down the part number and location of damaged shank nuts.
(3) Remove the damage shank nut. Use a hand drilling machine or equivalent, drill the flare of the shank nut until the flare twists. Use a 9.60 mm (0.3780 in.) drill. Take care not to damage the flange bore or face.
(4) Remove sharp edges around the nut location hole. Use V05-020 Waterproof silicon carbide abrasive paper.
(5) Clean the hole with a soft clean cloth and blast with air.
Subtask 72-31-12-230-050-A ** ON A/C NOT FOR ALL CAUTION:
DO NOT DAMAGE THE PARENT MATERIAL OF THE STAGE 1 FAN DISK.
(1) Examine and identify the damaged shank nuts. (2) Write down the part number and location of damaged shank nuts.
(3) Remove the damage shank nut. Use a hand drilling machine or equivalent, drill the flare of the shank nut until the flare twists. Use a 9.60 mm (0.3780 in.) drill. Take care not to damage the flange bore or face.
(4) Remove sharp edges around the nut location hole. Use V05-020 Waterproof silicon carbide abrasive paper.
(5) Clean the hole with a soft clean cloth and blast with air.
C. Examine the flange nut location hole of the stage 1 fan disk assembly
(1) Do a penetrant crack test. Use V06-022 fluorescent penetrant (ultra high post-emulsified). Refer to standard practice/procedure manual 70-23-05. Cracks are not permitted.
Subtask 72-31-12-220-052-A ** ON A/C NOT FOR ALL (1) Do a penetrant crack test. Use V06-022 fluorescent penetrant (ultra high post-emulsified). Refer to standard practice/procedure manual 70-23-05. Cracks are not permitted.
D. Examine the flange of the stage 1 fan disk assembly
(1) Visually examine the nut location hole. Nicks, scratches and burrs are not permitted.
Subtask 72-31-12-350-054-A ** ON A/C NOT FOR ALL (1) Visually examine the nut location hole. Nicks, scratches and burrs are not permitted.
E. Fit a new shank nut to the stage 1 fan disk assembly
(2) Fit a new shank nut into the flange nut location hole. Make sure the shank nut is installed correctly.
(3) Hold the shank nut in position and make a flare. Use PEENING TOOL.
Shank nut must be firmly held against the flange before the start of swaging. Care must be taken that the flange does not become damaged. During swaging, the tool may damage the silver coating inside the shank. This is permitted and it is not necessary to touch up if coating is damaged. Any loose flakes of silver coating are to be removed.
Subtask 72-31-12-220-053-A ** ON A/C NOT FOR ALL CAUTION:
DO NOT DAMAGE THE PARENT MATERIAL OF THE STAGE 1 FAN DISK.
(1) Prepare the new shank nut which has the same part number as identified for each location hole in SUBTASK 72-31-12-350-053, step B (1), (2). (2) Fit a new shank nut into the flange nut location hole. Make sure the shank nut is installed correctly.
(3) Hold the shank nut in position and make a flare. Use PEENING TOOL.
Shank nut must be firmly held against the flange before the start of swaging. Care must be taken that the flange does not become damaged. During swaging, the tool may damage the silver coating inside the shank. This is permitted and it is not necessary to touch up if coating is damaged. Any loose flakes of silver coating are to be removed.
F. Examine the shank nut of the stage 1 fan disk assembly
(1) Visually examine the shank nut. Flare should be evently peened. Cracks are not permitted. Circumferential movement of nut to flange is permitted but there must be no axial movement.
Subtask 72-31-12-420-054-B ** ON A/C NOT FOR ALL 5. Close-up(1) Visually examine the shank nut. Flare should be evently peened. Cracks are not permitted. Circumferential movement of nut to flange is permitted but there must be no axial movement.
Subtask 72-31-12-942-054-A ** ON A/C NOT FOR ALL
A. Remove the support equipment
(1) Remove the workmat.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).
(1) Remove the workmat.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).