DOC AIRBUS | AMM A320FVisual Inspection of the Accessory Gearbox (AGB) Assembly without Special Equipment [CFML]
TASK 72-63-00-210-802-A
Visual Inspection of the Accessory Gearbox (AGB) Assembly without Special Equipment
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 72-63-00-941-069-A
Subtask 72-63-00-210-054-A
Subtask 72-63-00-410-077-A
[Rev.10 from 2021]
2026.04.01 02:54:47 UTC
Visual Inspection of the Accessory Gearbox (AGB) Assembly without Special Equipment
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 1M(3 FT) |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1) | |
| 437AL, 438AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2) | |
| 447AL, 448AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-803-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-803-A | Closing of the Fan Cowl Doors |
| TASK 72-63-00-100-801-A | Cleaning of the Accessory Gearbox (AGB) Assembly |
Accessory Gearbox (AGB) AssemblySubtask 72-63-00-941-069-A
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 72-63-00-010-082-A (1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:
- The ENG/MODE selector switch
- The ENG/MASTER 1(2) control switch.
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
4. Procedure(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
Subtask 72-63-00-210-054-A
A. Visual Inspection of the Accessory Gearbox (AGB) Assembly
(1) Make sure that the AGB assembly (1) to be examined is clean (Ref. AMM TASK 72-63-00-100-801).
(2) Do a visual inspection of the external surfaces of all the removed components and other areas of the engine that are seen after the removal of the components. Refer to the table below for the inspection criteria.
5. Close-up(1) Make sure that the AGB assembly (1) to be examined is clean (Ref. AMM TASK 72-63-00-100-801).
(2) Do a visual inspection of the external surfaces of all the removed components and other areas of the engine that are seen after the removal of the components. Refer to the table below for the inspection criteria.
| Examine | Maximum Serviceable Limits | Maximum Repairable Limits | Repair Method |
|---|---|---|---|
| 1.Examine all the areas of the AGB assembly (1) for: | | | |
| A.Cracks | Not serviceable | Not repairable | None |
| B.Corrosion | Not serviceable | Not repairable | None |
| C.Missing surface protection for non machined surfaces | Five percent of visible checked surface | Not repairable | None |
| D.Missing surface protection on all other areas | Not serviceable | Not repairable | None |
| 2.Examine all areas of the inserts that are seen for | | | |
| A.Worn of internal threads | Any amount, if the total cumulated length is less than 1/2 one full thread | Not repairable | None |
| B.Looseness | Any amount, if the two keys are correctly in place | Not repairable | None |
| C.Missing insert or keys | Not serviceable | Not repairable | None |
| D.Self-locking quality running torque | 1. 0.2500-28 UNJF-3B Acceptable, if running torque is between 3.540 lbf.in (0.04 m.daN) and 30.004 lbf.in (0.34 m.daN) | Not repairable | None |
| | 2. 0.3750-24 UNJF-3B Acceptable, if running torque is between 9.470 lbf.in (0.11 m.daN) and 80.011 lbf.in (0.90 m.daN) | | |
| 3.Examine all areas of the key-locked studs that are seen for | | | |
| A.Worn of threads | Any amount, less than 1/2 full thread after removal of high metal, Refer LEAP-00-70-41-11-01A-655B-D | Not repairable | None |
| B.Looseness | Any amount, if keys are correctly in place | Not repairable | None |
| C.One or both keys missing | Not serviceable | Not repairable | None |
| D.Missing stud | Not serviceable | Not repairable | None |
| 4.Examine all areas of the ring-locked-nipple (9) that are seen for: see the sheet 5 of the figure | | | |
| A.Looseness | Not serviceable | Not repairable | None |
| B.Missing | Not serviceable | Not repairable | None |
| C.Missing wedge cone | Not serviceable | Not repairable | None |
| D.Blocked hole | Not serviceable | Not repairable | Clear with clean, dry high pressure air or reclean |
| E.Circumferential score marks on silver plated seating on all areas | Any amount, provided score mark does not penetrate parent metal | Not repairable | None |
| F.Circumferential scratches on area AA and AC, see the sheet 9 of the figure | Any number, not more than 0.0051 in. (0.13 mm) in depth after removal of high metal. Refer to LEAP-00-70-41-11-01A-655B-D | Not repairable | None |
| G.Circumferential scratches on area AB, see the sheet 9 of the figure | Any amount 0.0100 in. (0.25 mm) in depth that cannot be felt with a 0.04 in. (1.02 mm) radius scriber | Not repairable | None |
| H.Axial scratches on area AA and AC, see the sheet 9 of the figure | Any amount, not more than 0.0051 in. (0.13 mm) in depth after removal of high metal. Refer to LEAP-00-70-41-11-01A-655B-D | Not repairable | None |
| J.Axial scratches on area AB, see the sheet 9 of the figure | Not serviceable | Not repairable | None |
| K.Nicks on area AC, see the sheet 9 of the figure | Any amount if not felt with 0.0300 in. (0.76 mm) radius scriber | Not repairable | None |
| L.Nicks on area AA and AB, see the sheet 9 of the figure | Not serviceable | Not repairable | None |
| M.Missing locking see the sheet 9 of the figure | Not serviceable | Not repairable | None |
| 5.Examine all areas of the damper bearing (18) of the Accessory Gearbox (AGB) lug (16) that are seen for: see the sheets 1 and 2 of the figure | | | |
| A.Elastomer ruptured, sheared | Not serviceable | Not repairable | None |
| B.Corroded, pitted, galled | Not serviceable | Not repairable | None |
| C.Axial and radial play | Not serviceable | Not repairable | None |
| D.Fretting on location 5, see the sheet 2 of the figure | Any amount, not more than 0.040 in. (1.02 mm) depth | Not repairable | None |
| E.Fretting on inner bores | Not serviceable | Not repairable | None |
| F.Loose or missing | Not serviceable | Not repairable | None |
| 6.Examine link assemblies (20) and (21) that are seen for: see the sheet 4 of the figure | | | |
| A.Axial and radial play (coupling rod assembly) | Not serviceable | Not repairable | None |
| B.Seized-up (coupling rod assembly) | Not serviceable | Not repairable | None |
| 7.Examine all areas of the central damper (2) that are seen for: see the sheet 6 of the figure | | | |
| A.Elastomer ruptured or sheared | Not serviceable | Not repairable | None |
| B.Corroded, pitted or galled | Not serviceable | Not repairable | None |
| C.Axial and radial play | Not serviceable | Not repairable | None |
| D.Loose or missing | Not serviceable | Not repairable | None |
| 8.Examine the location 1 and 2 of the AGB housing lugs (15) that are seen for: see the sheet 5 of the figure and the sheet 1 of the figure | | | |
| A.Scratches, nicks, dents and scores | Not serviceable | Any amount under repair limit | Refer to (Ref. AMM D/O 72-63-00-35) |
| 9.Examine all areas of the damper bearings (17) of the AGB housing lug (15) that are seen for: see the sheets 1 and 3 of the figure | | | |
| A.Elastomer crumbling | Not serviceable | Not repairable | None |
| B.Corroded, pitted or galled | Not serviceable | Not repairable | None |
| C.Axial and radial play | Not serviceable | Not repairable | None |
| D.Loose or missing | Not serviceable | Not repairable | None |
| E.Fretting on the inner bores | Not serviceable | Not repairable | None |
| F.Fretting on location 7, see the sheet 5 of the figure | Not serviceable | Not repairable | None |
| 10.Examine location 1 and 2 of the AGB housing lug edge that are seen for: see the sheet 5 of the figure | | | |
| A.Scratches, nicks, dents and score | Not serviceable | Any amount under repair limits | Refer to (Ref. AMM D/O 72-63-00-35) |
| 11.Examine all areas of the face sealing surface (10) and radial sealing surface (11) that are seen for: see the sheet 6 of the figure | | | |
| A.Scratches, nicks, dents, score and fretting | Not serviceable | Not repairable | None |
| 12.Examine all areas of the centering pins that are seen for: | | | |
| A.Loose or worn | Not serviceable | Not repairable | None |
| 13.Examine all areas of the safety wires that are seen for: | | | |
| A.Broken | Not serviceable | Not repairable | None |
| B.Missing | Not serviceable | Not repairable | None |
| 14.Examine area C of the rotating seal assembly (12), that are seen for: see the sheets 4, 6 and 8 of the figure | | | |
| A.Fretting | Any amount if not felt with 0.0300 in. (0.76 mm) radius scriber | Not repairable | None |
| 15.Examine all areas (other than area C) of the rotating seal assembly (12) that are seen for: see the sheets 4, 6 and 8 of the figure | | | |
| A.Fretting | Not serviceable | Not repairable | None |
| 16.Examine all areas of the extraction pin of the rotating seal assembly (12) that are seen for: see the sheets 4, 6 and 8 of the figure | | | |
| A.Scratches, nicks and score | Not serviceable | Not repairable | None |
| 17.Examine all other areas of the rotating seal assembly (12) that are seen for: see the sheets 4, 6 and 8 of the figure | | | |
| A.Scratches, nicks and score | Not serviceable | Not repairable | None |
| 18.Examine all areas of the splines (4), that are seen for: see the sheet 7 of the figure | | | |
| A.Scratches | Any amount if not felt with 0.0300 in. (0.76 mm) in maximum depth | Not repairable | None |
| B.Nicks, dents and burrs | Any amount, not more than 0.0251 in. (0.64 mm) in maximum depth | Not repairable | None |
| C.Wear | Any amount affecting the spline flanks, which cannot be felt with a 0.0300 in. (0.76 mm) | Not repairable | None |
| 19.Examine all areas of the driver (13) that are seen for: see the sheet 2 of the figure | | | |
| A.Axial displacement | Not serviceable | Not repairable | None |
| 20.Examine the location 3 of the figure of the driver (13) that are seen for: see the sheet 2 of the figure and the sheet 2 of the figure | | | |
| A.Nicks, dents, scratches, scores | Not serviceable | Any amount under repair limits | Refer to (Ref. AMM D/O 72-63-00-35) |
| 21.Examine all areas of the spur gear that are seen for: see the sheet 7 of the figure | | | |
| A.Heat discoloration | CAUTION:
DO NOT APPLY ARDROX 185L ON THE OIL O-RING. IF YOU DO NOT OBEY THIS INSTRUCTION, DAMAGE TO THE O-RING CAN OCCUR. | Not repairable | None |
| | Accept bright polished steel to straw color. Accept blue color, if discoloration disappears after ARDROX 185L cleaning | | |
| 22.Examine the gearshaft tail (19), that are seen for: see the sheet 5 of the figure | | | |
| A.Scratches, nicks, dents | Not serviceable | Not repairable | None |
| 23.Examine the nipple (6) that are seen for: see the sheet 4 of the figure | | | |
| A.Worn threads | Any amount in the effective threads are not less than one after chasing | Not repairable | None |
| B.Circumferential scratches on areas A and C, see the sheet 8 of the figure | Any amount, not more than 0.0051 in. (0.13 mm) in depth after the removal of high metal. Refer to LEAP-00-70-41-11-01A-655B-D. | Not repairable | None |
| C.Circumferential scratches on area B, see the sheet 8 of the figure | Any amount if not felt with 0.04 in. (1.02 mm) radius scriber | Not repairable | None |
| D.Axial scratches on area A and C, see the sheet 8 of the figure | Any amount, not more than 0.0051 in. (0.13 mm) in depth after the removal of high metal. Refer to LEAP-00-70-41-11-01A-655B-D. | Not repairable | None |
| E.Axial scratches on area B, see the sheet 8 of the figure | Not serviceable | Not repairable | None |
| F.Nicks on area A, see the sheet 8 of the figure | Any amount, maximum of 0.031 in. (0.79 mm) in depth after removal of high metal. Refer to LEAP-00- 70-41-11-01A-655B-D. | Not repairable | None |
| G.Nicks on areas C and B, see the sheet 8 of the figure | Not serviceable | Not repairable | None |
| H.Scratches, nicks and dents on seal grooves | Not serviceable | Not repairable | None |
| J.Scratches, dents, nicks on hexagon (location 6), see the sheet 8 of the figure | Any amount, if the hexagon can be maintained by the wrench tool | Not repairable | None |
| K.Deformation and wear on safety wire holes | Serviceable, if metal around hole is not cracked or torn | Not repairable | None |
| L.Tear-out of safety wire holes | Serviceable, if one hole remains | Not repairable | None |
| 24.Examine the location 4 of OPT sensor support (5) that are seen for: see the sheet 4 of the figure and the sheet 4 of the figure | | | |
| A.Fretting | Any amount if not felt with 0.0300 in. (0.76 mm) radius scriber | Not repairable | None |
| B.Scratches, nicks, dents | Any amount if not felt with 0.0300 in. (0.76 mm) radius scriber | Not repairable | None |
| 25.Examine all areas of the coil (3), that are seen for: see the sheet 3 of the figure | | | |
| A.Worn surface treatment | Not serviceable | Not repairable | None |
| B.Scratches, nicks, dents and score | Not serviceable | Not repairable | None |
| 26.Examine all areas of the oil orifice of coil (3), that are seen for: see the sheet 3 of the figure | | | |
| A.Blocked | Not serviceable | Not repairable | None |
| 27.Examine all areas of the plug or restrictor of coil (3), that are seen for: see the sheet 3 of the figure | | | |
| A.Missing or loose | Not serviceable | Not repairable | None |
| 28.Examine the centering diameters of coil, that are seen for: see the sheet 3 of the figure | | | |
| A.Fretting | Acceptable if not felt with 0.0300 in. (0.76 mm) Radius scriber | Not repairable | None |
| 29.Examine all areas of the bracket (8), that are seen for: see the sheet 5 of the figure | | | |
| A.Dents on all areas | Not serviceable | Not repairable | None |
| B.Dents on welded joints, bending radius of brackets, radius zones, zones nears slots, grooves and holes, stiffening ribs | Not serviceable | Not repairable | None |
| C.Scores, scratches, rub and burrs on welded joints, bending radius of bracket, radius zones, zones near slots, grooves and holes, stiffening ribs | Not serviceable | Not repairable | None |
| D.Scores, scratches, rub and burrs on all other areas | Not serviceable | Not repairable | None |
| E.Worn threads on riveted nut | Not serviceable | Not repairable | None |
| F.Looseness of riveted nut | Not serviceable | Not repairable | None |
| 30.Examine all areas of the identification plate support (7), that are seen for: see the sheet 7 of the figure | | | |
| A.Loose or loss of serrated nails | Not serviceable | Not repairable | None |
| 31.Examine the location 8 of plug (22), that are seen for: see the sheet 10 of the figure and the sheet 5 of the figure | | | |
| A.Scratches, dents and nicks | Not serviceable | Not repairable | None |
| 32.Examine the safety wire holes of plug (22), that are seen for: see the sheet 5 of the figure | | | |
| A.Deformation and wear | Serviceable, if metal around hole is not cracked or torn | Not repairable | None |
| B.Tear-out | Serviceable, if there is one hole | Not repairable | None |
| 33.Examine all face sealing surfaces (10), radial sealing surfaces (11) and seal grooves of the covers, that are seen for: see the sheet 6 of the figure | | | |
| A.Scratches, nicks, dents and scores | Not serviceable | Not repairable | None |
| 34.Examine all other surfaces of the covers that are seen for: | | | |
| A.Scratches, nicks, dents and scores | Any amount that cannot be felt with a 0.02 in. (0.51 mm) radius scriber | Not repairable | None |
| 35.Examine all seal grooves areas of the AGB housing that are seen for: | | | |
| A.Scratches, nicks, dents and scores | Not serviceable | Not repairable | None |
| 36.Examine all other areas of the AGB assembly (1) that are seen for: | | | |
| A.Scratches, nicks, dents and scores | Any amount that cannot be felt with a 0.0300 in. (0.76 mm) radius scriber | Not repairable | None |
| 37.Examine areas H, K, J and G of AGB assembly (1) that are seen for: see the sheets 2, 3, 4 and 5 of the figure | | | |
| A.Scratches, nicks, dents and scores | Not serviceable | Any amount under repair limits | Refer to (Ref. AMM D/O 72-63-00-35) |
Subtask 72-63-00-410-077-A
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).