DOC AIRBUS | AMM A320FRemove the Fan Blade Set from One Engine and Move to Another [PW11]
TASK 72-11-03-960-801-A
Remove the Fan Blade Set from One Engine and Move to Another
Use this procedure to move a fan blade set from Engine A onto Engine B. Engine A is the donor engine and Engine B is the receiver engine. The fan rotor assembly counterweights on the fan hub of Engine A are installed in the same location on Engine B. The N1 modifiers are updated in the Data Storage Unit (DSU) on Engine B.
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 72-11-03-941-064-A ** ON A/C NOT FOR ALL
(2) Remove the inlet cone (Ref. AMM TASK 72-11-01-000-801).
(3) Make an alignment mark on the hub and the lockring (2) with theP05-472 marker - high purity, black, trace element certified
(4) Make a location mark (for example No. 1) on the No. 1 fan blade installed in the No. 1 fan blade slot with theP05-472 marker - high purity, black, trace element certified
(6) Record the location of all fan rotor assembly clip-on counterweights and riveted fan counterweights that have a "FAN" mark relative to the fan hub slot and blade numbers
(a) If riveted fan counterweights are installed, make sure that you remove and install the COVER - PROTECTION as necessary to prevent damage to the adjacent surfaces and to make sure that the rivet parts and pieces do not go into the engine.
(b) If there is no center indentation, center-punch the rivet before you drill into the rivet head.
(c) Use a drill size smaller than the rivet shank diameter. Keep the drill perpendicular to the surface and drill through the head and a small distance into the rivet shank. Do not drill into the rivet base structure. Do not oversize the rivet hole or allow the drill bit to touch the fan hub flange.
(a) Turn the lockring (2) to disengage and remove from the hub. If necessary, use the PWA111529 FIXTURE, INSTALLATION.
(9) Remove the spacers. If necessary, use the PWA111016 PULLER, HAND.
(b) Turn the fan rotor so that the No. 1 fan blade (1) is at the top position.
(d) Put the fan blade (1) in the PWA110921 STORAGE STAND or other applicable container or area
(e) Do steps 4.A.(10)(a) thru 4.A.(10)(d) for each of the 20 fan blades (1) in a counterclockwise direction as seen from the front.
(11) Make sure to remove any tools in the engine after the fan blades, the spacers and the lockring are removed.
(12) Record the N1 modifiers from the donor engine (engine A). N1 modifiers are related to the fan blade set and move with the fan blade set.
Subtask 72-11-03-420-051-A ** ON A/C NOT FOR ALL
Subtask 72-11-03-860-056-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:47:50 UTC
Remove the Fan Blade Set from One Engine and Move to Another
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION:
DO NOT LET NEW OR OVERHAULED ENGINES THAT HAVE NO OIL IN THE SYSTEM (BEFORE THE FIRST OIL SERVICING) WINDMILL. IF THE ENGINE WINDMILLS, DAMAGE TO THE JOURNAL BEARINGS CAN OCCUR.
ZONE: 400
1. Reason for the JobUse this procedure to move a fan blade set from Engine A onto Engine B. Engine A is the donor engine and Engine B is the receiver engine. The fan rotor assembly counterweights on the fan hub of Engine A are installed in the same location on Engine B. The N1 modifiers are updated in the Data Storage Unit (DSU) on Engine B.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | COVER - PROTECTION |
| No specific | AR | GLOVES - PROTECTIVE |
| No specific | AR | MAT - PROTECTIVE |
| 636-1100-3GSE | 1 | INLET COWL PROTECT COVER |
| PWA110921 | 1 | STORAGE STAND |
| PWA111016 | 1 | PULLER, HAND |
| PWA111515 | 1 | SYSTEM, INSTALLATION |
| PWA111529 | 1 | FIXTURE, INSTALLATION |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.P05-472) | marker - high purity, black, trace element certified |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-40-00-910-801-A | Marking of Parts |
| TASK 71-00-00-700-802-A | Test No. 8 - Vibration Analysis (Vibration Survey) |
| TASK 71-00-00-710-807-A | Function Test (Fan Trim Balance) |
| TASK 71-00-00-860-833-A | Procedure to Prevent Engine Motoring |
| TASK 72-11-01-000-801-A | Removal of the Inlet Cone |
| TASK 72-11-01-400-801-A | Installation of the Inlet Cone |
| TASK 72-11-03-220-804-A | Visual Examination of the Fan Blade Spacer |
20 Fan Blades - (Fan Rotor Assembly/Fan Hub Counterweights)Subtask 72-11-03-941-064-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
4. Procedure(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 72-11-03-020-051-A ** ON A/C NOT FOR ALL CAUTION:
REMOVE AND INSTALL PROTECTION COVERS AS NECESSARY TO PREVENT DAMAGE TO THE ENGINE AND ADJACENT COMPONENTS.
A. Removal of the Fan Blades from Engine A NOTE: The donor engine is engine A. The receiver engine is engine B. The fan blades and the fan counterweights from engine A are moved to engine B.
(1) Put the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE in the intake cowl. (2) Remove the inlet cone (Ref. AMM TASK 72-11-01-000-801).
(3) Make an alignment mark on the hub and the lockring (2) with the
(4) Make a location mark (for example No. 1) on the No. 1 fan blade installed in the No. 1 fan blade slot with the
NOTE: The No. 1 slot is identified by the "No. 1" imprinted on the outer edge of the hub. Blade slots No. 2 thru 20 are identified in a counterclockwise direction as you look aft from the front of the engine.
(5) Make location marks on the remaining fan blades 2 thru 20 in a counterclockwise direction as you look aft from the front of the engine. (6) Record the location of all fan rotor assembly clip-on counterweights and riveted fan counterweights that have a "FAN" mark relative to the fan hub slot and blade numbers
CAUTION:
DO NOT REMOVE COUNTERWEIGHTS WHICH HAVE THE "HUB" INDICATION. IF YOU DO, YOU CAN CAUSE INCREASED FAN VIBRATIONS.
(7) Remove the fan rotor clip-on counterweights and riveted counterweights that have the "FAN" mark as follows: (a) If riveted fan counterweights are installed, make sure that you remove and install the COVER - PROTECTION as necessary to prevent damage to the adjacent surfaces and to make sure that the rivet parts and pieces do not go into the engine.
(b) If there is no center indentation, center-punch the rivet before you drill into the rivet head.
(c) Use a drill size smaller than the rivet shank diameter. Keep the drill perpendicular to the surface and drill through the head and a small distance into the rivet shank. Do not drill into the rivet base structure. Do not oversize the rivet hole or allow the drill bit to touch the fan hub flange.
NOTE: Rivet shank diameter is 0.093 in. (2.362 mm) minimum.
(8) Remove the lockring (2) from the hub as follows (a) Turn the lockring (2) to disengage and remove from the hub. If necessary, use the PWA111529 FIXTURE, INSTALLATION.
(9) Remove the spacers. If necessary, use the PWA111016 PULLER, HAND.
NOTE: It is easier to work at the bottom of the rotor to remove the spacers.
(10) Remove the fan blades (1) from the fan hub as follows: WARNING:
USE PROTECTIVE GLOVES TO PREVENT POSSIBLE INJURY TO THE HANDS WHEN YOU TOUCH OR HOLD THE FAN BLADES. THE BLADE EDGES ARE SHARP AND CAN CUT THE HANDS.
(a) Put the GLOVES - PROTECTIVE on your hands. (b) Turn the fan rotor so that the No. 1 fan blade (1) is at the top position.
NOTE: It is safest to work at the top of the rotor where the fan blades are loose. As you remove the fan blades, the rotor will turn and the heavy side of the rotor is at the bottom.
(c) Pull the fan blade (1) to remove it from the hub (d) Put the fan blade (1) in the PWA110921 STORAGE STAND or other applicable container or area
(e) Do steps 4.A.(10)(a) thru 4.A.(10)(d) for each of the 20 fan blades (1) in a counterclockwise direction as seen from the front.
(11) Make sure to remove any tools in the engine after the fan blades, the spacers and the lockring are removed.
(12) Record the N1 modifiers from the donor engine (engine A). N1 modifiers are related to the fan blade set and move with the fan blade set.
B. Installation of the Fan Blades from Engine A onto Engine B
(1) Put the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE in the intake cowl of engine B.
(2) Remove the current fan blades and fan counterweights from engine B if necessary. Refer to Para 4.A.
(4) Find the No. 1 blade slot on the fan hub and fan blades No. 1 thru 20 (1)
(7) Continue to install remaining fan blades (1) in a clockwise direction as seen from the front.
(a) Examine all the fan blade locations to make sure that all 20 spacers (3) are installed.
(b) Find the alignment mark on the hub and on the lockring (2).
(c) Install the lockring (2) and turn it to engage the fan hub. If necessary, use the PWA111529 FIXTURE, INSTALLATION:
1 You can turn the lockring (2) clockwise or counterclockwise to engage the lugs.
2 If you cannot turn the lockring (2) easily, make sure that the fan blades and spacers are fully installed in the hub slots.
(d) Remove the PWA111529 FIXTURE, INSTALLATION from the lockring (2).
(a) Make sure that you install the weights on the fan hub in the same position relative to the fan blades as engine A.
1 Clip−on counterweights (15) are installed to the fan hub outer holes only.
2 Riveted counterweights (13) are installed to the fan hub center holes only.
(c) If the donor engine (engine A) had riveted counterweights, replace them with the equivalent clip-on counterweights from Table 1 before installation on the receiver engine (engine B).
(d) Install the replacement clip-on counterweights in the end holes of balance tabs, nearest to the blade that the riveted counterweight aligned with the donor engine (engine A).
(e) Pull each clip−on counterweight (15) body inward to make sure that the pin is engaged correctly.
(12) Install the inlet cone (Ref. AMM TASK 72-11-01-400-801).
(13) Use the PWA111515 SYSTEM, INSTALLATION common engine software loader to adjust the N1 modifiers as necessary. Do the procedure that follows to find the necessary adjustments and refer to Service Bulletin (SB) PW1000G−C−73−00−0003−00A−930A−D (Fan Blade Replacement - N1 Modifiers) to adjust the N1 modifiers in engine DSU and data plate. Contact P&W field representative for manual N1 modifier updates.
(a) It is not necessary to adjust the N1 modifiers from the donor engine (engine A) when moved to the receiver engine (engine B) if:
1 The fan blade set was received from a different engine before this time. In this instance, the 'subtract 6' adjustment to the N1 modifiers, was done.
2 The N1 modifiers of the fan blade set (donor engine) are currently at one of four max class settings as shown in Table 2.
a Do not set modifiers to a value lower than max class.
(b) It is necessary to adjust N1 modifiers from the donor engine (engine A) when moved to the receiver engine (engine B) if:
1 The fan blade set was not received from the different engine before this time:
a Subtract 6 from each N1 modifier currently shown on engine A (example: -15/15/15/21) will be (-21/9/9/15).
b Do not adjust the N1 modifiers if currently at one of the max class settings shown in Table 2.
2 The fan blade set was moved from engine A to engine B and it now moved back to engine A:
a Add 6 to each N1 modifier currently shown on engine B (example: -21/9/9/15) will be (-15/15/15/21).
b Do not adjust N1 modifiers if currently at one of the max class settings shown in Table 2.
(c) Use these new N1 modifiers to reprogram the DSU on engine B (receiver engine).
(d) Vibropeen the four new N1 modifiers in the "Class" block of the receiver engine data plate. Refer to SB PW1000G-C-73-00-0003-00A-930A-D.
(15) Do the vibration analysis (Ref. AMM TASK 71-00-00-700-802).
(a) If necessary, do the function test (fan trim balance) (Ref. AMM TASK 71-00-00-710-807).
5. Close-up(1) Put the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE in the intake cowl of engine B.
(2) Remove the current fan blades and fan counterweights from engine B if necessary. Refer to Para 4.A.
WARNING:
USE PROTECTIVE GLOVES TO PREVENT POSSIBLE INJURY TO THE HANDS WHEN YOU TOUCH OR HOLD THE FAN BLADES. THE BLADE EDGES ARE SHARP AND CAN CUT THE HANDS.
(3) Put the GLOVES - PROTECTIVE on your hands. (4) Find the No. 1 blade slot on the fan hub and fan blades No. 1 thru 20 (1)
NOTE: The No. 1 slot is identified by the "No. 1" imprinted on the outer edge of the hub. No. 2 thru 20 blade slots are identified in a counterclockwise direction as you look aft from the front of the engine.
(5) Turn the fan rotor so the No. 1 blade slot is at the bottom. NOTE: It is safest to work at the bottom of the rotor when you install the fan blades. As you install the fan blades, the rotor will turn and the heavy side of the rotor is at the bottom.
(6) Install the fan blade (1) with the No. 1 mark into the No. 1 fan blade slot. (7) Continue to install remaining fan blades (1) in a clockwise direction as seen from the front.
NOTE: Slot numbers on the fan hub go in a counterclockwise direction as seen from the front.
(8) Before installation of the spacer (3) between the fan blade (1) and the hub slot, do a visual inspection of the spacer for damage. If damage is found, do a detailed visual examination of the fan blade spacer (Ref. AMM TASK 72-11-03-220-804) and NOTE: It is permitted to install spacers at the same time as the fan blades.
(9) Install the spacer (3) fully into the hub slot. NOTE: You can use a soft drift if you cannot push the spacer into the slot fully.
(10) Install the lockring (2) as follows:(a) Examine all the fan blade locations to make sure that all 20 spacers (3) are installed.
(b) Find the alignment mark on the hub and on the lockring (2).
(c) Install the lockring (2) and turn it to engage the fan hub. If necessary, use the PWA111529 FIXTURE, INSTALLATION:
1 You can turn the lockring (2) clockwise or counterclockwise to engage the lugs.
2 If you cannot turn the lockring (2) easily, make sure that the fan blades and spacers are fully installed in the hub slots.
(d) Remove the PWA111529 FIXTURE, INSTALLATION from the lockring (2).
CAUTION:
DO NOT REMOVE COUNTERWEIGHTS WHICH HAVE THE "HUB" INDICATION. IF YOU DO, YOU CAN CAUSE INCREASED FAN VIBRATIONS.
(11) Install the fan assembly clip-on counterweights (15) as necessary from engine A to engine B as follows(a) Make sure that you install the weights on the fan hub in the same position relative to the fan blades as engine A.
CAUTION:
DO NOT INSTALL THE CLIP-ON COUNTERWEIGHTS IN THE MIDDLE HOLES ON THE BALANCE TABS. IF YOU DO, DAMAGE TO THE ENGINE CAN OCCUR.
(b) Press the pin to compress the spring and install the counterweight on the fan hub. You can install the counterweight with the spring side in the forward or aft position: 1 Clip−on counterweights (15) are installed to the fan hub outer holes only.
2 Riveted counterweights (13) are installed to the fan hub center holes only.
(c) If the donor engine (engine A) had riveted counterweights, replace them with the equivalent clip-on counterweights from Table 1 before installation on the receiver engine (engine B).
(d) Install the replacement clip-on counterweights in the end holes of balance tabs, nearest to the blade that the riveted counterweight aligned with the donor engine (engine A).
(e) Pull each clip−on counterweight (15) body inward to make sure that the pin is engaged correctly.
(12) Install the inlet cone (Ref. AMM TASK 72-11-01-400-801).
(13) Use the PWA111515 SYSTEM, INSTALLATION common engine software loader to adjust the N1 modifiers as necessary. Do the procedure that follows to find the necessary adjustments and refer to Service Bulletin (SB) PW1000G−C−73−00−0003−00A−930A−D (Fan Blade Replacement - N1 Modifiers) to adjust the N1 modifiers in engine DSU and data plate. Contact P&W field representative for manual N1 modifier updates.
(a) It is not necessary to adjust the N1 modifiers from the donor engine (engine A) when moved to the receiver engine (engine B) if:
1 The fan blade set was received from a different engine before this time. In this instance, the 'subtract 6' adjustment to the N1 modifiers, was done.
2 The N1 modifiers of the fan blade set (donor engine) are currently at one of four max class settings as shown in Table 2.
a Do not set modifiers to a value lower than max class.
(b) It is necessary to adjust N1 modifiers from the donor engine (engine A) when moved to the receiver engine (engine B) if:
1 The fan blade set was not received from the different engine before this time:
a Subtract 6 from each N1 modifier currently shown on engine A (example: -15/15/15/21) will be (-21/9/9/15).
b Do not adjust the N1 modifiers if currently at one of the max class settings shown in Table 2.
2 The fan blade set was moved from engine A to engine B and it now moved back to engine A:
a Add 6 to each N1 modifier currently shown on engine B (example: -21/9/9/15) will be (-15/15/15/21).
b Do not adjust N1 modifiers if currently at one of the max class settings shown in Table 2.
(c) Use these new N1 modifiers to reprogram the DSU on engine B (receiver engine).
(d) Vibropeen the four new N1 modifiers in the "Class" block of the receiver engine data plate. Refer to SB PW1000G-C-73-00-0003-00A-930A-D.
NOTE: The number of blades replaced on engine A since the last test cell calibration run counts toward the number of blades replaced on engine B. You will have to adjust the N1 modifiers again when a total of 5 - 10 blades are replaced and again when 11 or more blades are replaced, unless the N1 modifiers are currently at one of the max class settings.
(14) Remove the 636-1100-3GSE INLET COWL PROTECT COVER or equivalent and the MAT - PROTECTIVE from the intake cowl. (15) Do the vibration analysis (Ref. AMM TASK 71-00-00-700-802).
(a) If necessary, do the function test (fan trim balance) (Ref. AMM TASK 71-00-00-710-807).
NOTE: The fan blade set that is transferred is a balanced set of the fan blades.
(16) Examine the assembly for foreign objects, damage and correct assembly.| Riveted PN | Class | Clip-on PN | Class |
|---|---|---|---|
| 534493 | CL1-CL3 | 51A591-01 | CL1 |
| 534495 | CL1-CL5 | 51A591-01 | CL2 |
| 1B4294 | (none) | 51A592-01 | CL2 |
| 50B926 | (none) | 51A597-01 | CL1 |
Table - Riveted to Clip-on Fan Counterweight Equivalencies
| Setting Name | Modifier 1 (D band) | Modifier 2 (C band) | Modifier 3 (B band) | Modifier 4 (A band) | Note |
|---|---|---|---|---|---|
| Field max class 1 | -59 | -39 | -36 | -36 | Set when 11 - 20 fan blades were replaced |
| Field max class 2 | -59 | -39 | -36 | -51 | Update requirement for field max class 1 |
| Production max class | -72 | -42 | -45 | -42 | Assigned to a small quantity of production engines |
| Production max class modified | -72 | -42 | -45 | -51 | Production max class modified when 11 - 20 fan blades were replaced |
Table - N1 Modifier Max Class Settings
Subtask 72-11-03-860-056-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).