DOC AIRBUS | AMM A320FInspection of the Stage 1 Fan Disk and the Rear Blade Retaining Ring [IAE]
TASK 72-31-12-200-010-B
Inspection of the Stage 1 Fan Disk and the Rear Blade Retaining Ring
1. Reason for the Job
This task gives the procedure for the inspection of the stage 1 fan disk and the rear blade retaining ring.
This TASK is for V2500-A5 engines.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 72-31-12-941-059-A ** ON A/C NOT FOR ALL
Subtask 72-31-12-020-057-A ** ON A/C NOT FOR ALL
Subtask 72-31-12-942-056-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:45:04 UTC
Inspection of the Stage 1 Fan Disk and the Rear Blade Retaining Ring
1. Reason for the Job
This task gives the procedure for the inspection of the stage 1 fan disk and the rear blade retaining ring.
This TASK is for V2500-A5 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 | MIRROR - INSPECTION |
| 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 |
| TASK 72-31-12-300-010-A | Replacement of the Stage 1 Fan Disk Rear Ramp - VRS1148 |
| TASK 72-31-12-300-011-A | Repair the Stage 1 Fan Disk Touch up Coating - VRS1149 |
| TASK 72-31-12-300-012-A | Repair of the LP Compressor Fan Disk, Re-apply Coating - VRS1974 |
| TASK 72-31-12-300-020-A | Replacement of the Stage 1 Fan Disk Shank Nut - VRS1174 |
Stage 1 Fan DiskSubtask 72-31-12-941-059-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put the support equipment in position.
(a) Put the ACCESS PLATFORM 1M(3 FT) in position to give access to the engine for the inspection.
(b) Put the MAT - WORK in position in the air intake cowl.
4. Procedure(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put the support equipment in position.
(a) Put the ACCESS PLATFORM 1M(3 FT) in position to give access to the engine for the inspection.
(b) Put the MAT - WORK in position in the air intake cowl.
NOTE: Make sure that the red warning pennants of the workmat can be seen external of the aircraft. Make sure the workmat has sufficient dimensions to give full protection to the lower half of the intake cowl surface.
Subtask 72-31-12-020-057-A ** ON A/C NOT FOR ALL
A. Removal of the Stage 1 Fan Blade
(1) Remove the stage 1 fan blade from the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-000-010).
Subtask 72-31-12-210-052-A ** ON A/C NOT FOR ALL (1) Remove the stage 1 fan blade from the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-000-010).
B. Examine the stage 1 fan disk assembly.
(1) Examine the dovetail slots of the stage 1 fan disk assembly for peeling of the dry film lubricant. Use a MIRROR - INSPECTION.
(a) If they have any amount of peeling of dry film lubricant, do repair VRS1149 (Ref. AMM TASK 72-31-12-300-011) or VRS1974 (Ref. AMM TASK 72-31-12-300-012).
(2) Examine the rear ramps of the stage 1 fan disk assembly for being loose or separated.
(a) If they show signs of being loose or separating between the rear ramp and fan disk assembly, do repair VRS1148 (Ref. AMM TASK 72-31-12-300-010).
(3) Examine the shank nuts of the stage 1 fan disk assembly.
(a) If they show signs of being loose or damaged, do repair VRS1174 (Ref. AMM TASK 72-31-12-300-020).
(b) If the locking torque is greater than 60.00 lbfin (6.780 Nm) or less than 6.500 lbfin (0.735 Nm), do repair VRS1174.
Refer to standard practice/procedure manual 70-23-11.
Subtask 72-31-12-210-054-A ** ON A/C NOT FOR ALL (1) Examine the dovetail slots of the stage 1 fan disk assembly for peeling of the dry film lubricant. Use a MIRROR - INSPECTION.
(a) If they have any amount of peeling of dry film lubricant, do repair VRS1149 (Ref. AMM TASK 72-31-12-300-011) or VRS1974 (Ref. AMM TASK 72-31-12-300-012).
(2) Examine the rear ramps of the stage 1 fan disk assembly for being loose or separated.
(a) If they show signs of being loose or separating between the rear ramp and fan disk assembly, do repair VRS1148 (Ref. AMM TASK 72-31-12-300-010).
(3) Examine the shank nuts of the stage 1 fan disk assembly.
(a) If they show signs of being loose or damaged, do repair VRS1174 (Ref. AMM TASK 72-31-12-300-020).
(b) If the locking torque is greater than 60.00 lbfin (6.780 Nm) or less than 6.500 lbfin (0.735 Nm), do repair VRS1174.
Refer to standard practice/procedure manual 70-23-11.
C. Examine the stage 1 fan disk and rear blade retaining ring for arc-burns.
Subtask 72-31-12-420-056-A ** ON A/C NOT FOR ALL NOTE: An arc-burn is evident by a small circular or semi-circular heat-affected area on the stage 1 fan disk and rear blade retaining ring surface that can contain pitting, melting or cracking. Visually a dark blue oxide discoloration can be associated with the heat-affected area.
(1) If they show signs of arc-burns, reject them. D. Installation of the Stage 1 Fan blade
(1) Install the stage 1 fan blade to the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-400-010).
5. Close-up(1) Install the stage 1 fan blade to the stage 1 fan disk assembly (Ref. AMM TASK 72-31-11-400-010).
Subtask 72-31-12-942-056-A ** ON A/C NOT FOR ALL
A. Removal of the Support Equipments
(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).