DOC AIRBUS | AMM A320FInspection/Check of the Stage 1 Booster Vane, Fan Disk, Fan Blade Spacers, Retainers and Dampers and Shims [CFMI]
TASK 72-21-00-210-003-A
Inspection/Check of the Stage 1 Booster Vane, Fan Disk, Fan Blade Spacers, Retainers and Dampers and Shims
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 72-21-00-941-061-A ** ON A/C NOT FOR ALL
Subtask 72-21-00-210-052-A ** ON A/C NOT FOR ALL
Subtask 72-21-00-410-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 07:32:33 UTC
Inspection/Check of the Stage 1 Booster Vane, Fan Disk, Fan Blade Spacers, Retainers and Dampers and Shims
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 72-00-00-200-005-A | Over-Serviceable-Limit Extensions |
| TASK 72-21-00-000-003-A | Removal of the Fan Rotor Blades |
| TASK 72-21-00-000-004-A | Removal of the Stage 1 Booster Vane Assembly |
| TASK 72-21-00-320-002-A | Blending of Booster Stage 1 Vane Assembly |
| TASK 72-21-00-320-008-A | Reconditioning of Lubricant Coating on the Fan Blade Shim |
| TASK 72-21-00-400-003-A | Installation of the Fan Rotor Blades |
| TASK 72-21-00-400-004-A | Installation of the Stage 1 Booster Vane Assembly |
Inspection of Fan DiskSubtask 72-21-00-941-061-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).
Subtask 72-21-00-010-053-A ** ON A/C NOT FOR ALL 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).
Subtask 72-21-00-210-052-A ** ON A/C NOT FOR ALL
A. Visually inspect the following:
END OF CFM SB 72-0621
5. Close-up| INSPECT/CHECK | MAXIMUM SERVICEABLE LIMITS | REMARKS |
|---|---|---|
| 1.Fan blade damper for: | | |
| A.Wear or fretting on the rear or upper shield | Any amount without cracks | Replace damper |
| B.Rear or upper shield unbonded or missing | Not serviceable | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| 2.Damper retainer for: | | |
| A.Wear or fretting on contact face | Any amount 0.02 in. (0.5 mm) deep | |
| 3.Booster vanes (stage 1 only) for: | | |
| A.Piece missing: | Maximum number 20 blades up to 0.256 in. (6.5 mm) axial, 0.728 in. (18.5 mm) radial on all airfoil surfaces, except in areas A and B | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| B.Broken vane: | Not serviceable | For Stg 1 replace stage 1 booster vane (Ref. AMM TASK 72-21-00-000-004) and (Ref. AMM TASK 72-21-00-400-004). For stg 2, 3 and 4 replace engine. |
| C.Disengagement from inner shroud: | Not serviceable | For Stg 1 replace stage 1 booster vane (Ref. AMM TASK 72-21-00-000-004) and (Ref. AMM TASK 72-21-00-400-004). For stg 2, 3 and 4 replace engine. |
| D.Cracks and tears: | In area C, any number, less than 0.256 in. (6.5 mm) radial, less than 0.079 in. (2 mm) axial. In areas A and B any number less than 0.128 in. (3.25 mm) radial, less than 0.039 in. (1 mm) axial. | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| E.Distortion of T/E and L/E: | Any number, if the length L is not more than 0.709 in. (18 mm) and the maximum dimension X along the chord width is not more than 0.256 in. (6.5 mm) | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| F.Nicks, dents, scratches for areas A and B: | Any number, less than 0.09 in. (2.3 mm) in diameter. Bulging acceptable, but not through | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| G.Nicks, dents, scratches for area "C": | Any number, less than 0.197 in. (5 mm) in diameter. Bulging acceptable, but not through | Refer to Over-Serviceable-Limit Extensions (Ref. AMM TASK 72-00-00-200-005) |
| H.Nicks, dents, scratches L/E and T/E: | Maximum axial length less than 0.079 in. (2 mm) | For L/E, repair the stage 1 booster vane (Ref. AMM TASK 72-21-00-320-002) Refer to Over-Serviceable-Limit Extension (Ref. AMM TASK 72-00-00-200-005) |
| J.Deposits and erosion: | Any amount | Refer to Over-Serviceable-Limit Extension (Ref. AMM TASK 72-00-00-200-005) |
| K.Erosion of abradable lining on outer shroud | Any amount | |
| L.Flaking of abradable lining on outer shroud | Any number, maximum surface affected less than 24.80 sq. in. (16000 sq. mm) | |
| 4.Fan disk for: | | |
| A.Cracks | Not serviceable. | |
| B.Wear on dovetail slot pressure faces. | No limit, if less than 50 percent of area is damaged. If the maximum affected surface, even only on one side of one slots, is greater than or equal to 50%, any amount if less than 0.23 mm (0.0091 in.) deep. | See limit extensions (Ref. AMM TASK 72-00-00-200-005). Wear depth measurement is required on all dovetail slot with tooling 856A6802G01. |
| C.Nicks and scratches. | No limited quantity, if not deeper than 0.01 in. (0.25 mm) after removal of high metal. None permitted within 0.5 in. (12.7 mm) of dovetail slots disk bore and aft surface of web. | See limit extensions (Ref. AMM TASK 72-00-00-200-005). |
| 5.Fan blade retainer for: | | |
| A.Cracks | Not serviceable. | Replace blade retainer |
| B.Fretting, corrosion | Any amount 0.004 in. (0.1 mm) in depth | Replace blade retainer |
| 6.Fan blade spacer for: | | |
| A.Cracks | Not serviceable. | Replace blade spacer |
| B.Fretting | Any amount 0.004 in. (0.1 mm) in depth | Replace blade spacer |
| C.Corrosion, pitting | Any amount if less than 0.0098 in. (0.25 mm) in depth if the surface protection is not damaged | Replace blade spacer |
| D.Damaged surface protection | Any amount if less than 20 percent of total surface if parent material is found without corrosion pitting in the damaged area | Replace blade spacer |
| E.Scratches | Any amount 0.004 in. (0.1 mm) max depth after removal of high metal | Replace blade spacer PRE CFM SB 72-0621 |
| 7.Shim: A.Not applicable END OF PRE CFM SB 72-0621 POST CFM SB 72-0621 | | |
| 8.Shim for: | | |
| A.Damage on molydag coating on pressure face | Missing molydag on 25 percent of pressure face | Recondition the molydag coating (Ref. AMM TASK 72-21-00-320-008) |
| | | See limit extensions (Ref. AMM TASK 72-00-00-200-005) |
| B.Cracks, tears or holes | Not serviceable | Replace the shim |
| C.Scratches | No more than 0.003 in. (0.08 mm) | Replace the shim |
| D.Nicks, dents | No more than 0.003 in. (0.08 mm) in depth and cumulated surface affected less than 10 percent of each contact pressure face | Replace the shim |
END OF CFM SB 72-0621
Subtask 72-21-00-410-054-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Install the fan blades (Ref. AMM TASK 72-21-00-400-003).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).
(1) Install the fan blades (Ref. AMM TASK 72-21-00-400-003).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Remove the WARNING NOTICE(S).