DOC AIRBUS | AMM A320FVisual Inspection of the Wiring Harnesses [CFMB]
TASK 73-21-50-210-002-A
Visual Inspection of the Wiring Harnesses
Self explanatory
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 73-21-50-941-069-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-210-051-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-410-079-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:59:10 UTC
Visual Inspection of the Wiring Harnesses
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobSelf explanatory
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 | 1 | AIR SOURCE FILTERED, DRY |
| No specific | AR | BRUSH - BRISTLED |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1041) | isopropyl alcohol |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-040-B | Closing of the Fan Cowl Doors |
| TASK 73-21-10-000-002-A | Removal of the Hydromechanical Unit (HMU) |
| TASK 73-21-10-400-002-A | Installation of the Hydromechanical Unit (HMU) |
| TASK 73-21-50-000-040-A | Removal of the HJ7 Harness for SAC Engines |
| TASK 73-21-50-000-041-A | Removal of the HJ8 Harness for SAC Engines |
| TASK 73-21-50-300-003-A | Repair of Wiring Harness with Fiber-Glass Tape and Lockwire |
| TASK 73-21-50-300-004-A | Repair of Wiring Harness with Silicone Rubber Tape |
| TASK 73-21-50-400-040-A | Installation of the HJ7 Harness for SAC Engines |
| TASK 73-21-50-400-041-A | Installation of the HJ8 Harness for SAC Engines |
| TASK 73-21-50-750-003-A | Retention Test of the Connector Socket |
| TASK 78-30-00-081-041-B | Make the Thrust Reverser Serviceable after Maintenance |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
| TASK 78-36-00-410-040-B | Closing of the Thrust Reverser Doors |
ConnectorSubtask 73-21-50-941-069-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC 1(2).
Subtask 73-21-50-010-092-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than five minutes before you do this procedure.
(3) On 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) in position to tell persons not to energize FADEC 1(2).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 73-21-50-040-118-A ** ON A/C NOT FOR ALL Subtask 73-21-50-010-159-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
D. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-210-051-A ** ON A/C NOT FOR ALL
A. Visual Inspection of the Wiring Harness
5. Close-up| INSPECT/CHECK | MAXIMUM SERVICEABLE LIMITS | REMARKS |
|---|---|---|
| 1.The cables for: | | |
| A.Cuts, abrasion collapse, rupture of cable sheath | Not serviceable | Replace harness |
| B.Broken strands on braided conduit | 3 broken strands for each braid if one unbroken strand is remaining and no more than 9 broken strands for each lead | Replace harness |
| C.Braze joint separation on braided conduit | Not serviceable | Replace harness |
| D.Single wire out of the braid which connect with attachment points or terminal lug cable or metallic coiled adapter | Not serviceable | Replace harness |
| E.Single wire out of the braid between two attachment points | Only one not more than 1.25 in. (31.75 mm) maximum width | Repair wiring harness with fiber-glass tape and lockwire (Ref. AMM TASK 73-21-50-300-003) |
| | Only one not more than 1.25 in. (31.75 mm) maximum width, if not more than one-fourth of a turn distance between two adjacent repaired areas must be 1.00 in. (25.4 mm) minimum | Repair wiring harness with silicone rubber tape (Ref. AMM TASK 73-21-50-300-004) |
| 2.The electrical connectors for: | | |
| A.Thread damage | 30 percent damage on one lead-in thread or 20 percent damage of two lead-in threads | Chase threads if in specified limits, or replace the harness |
| B.Pin damage | Must connect freely with the related leads | Straighten bent pins. Replace harness if pins are broken, eroded, or seized. |
| C.Dirt inside connector well | None permitted | Clean with a BRUSH - BRISTLED and isopropyl alcohol (Material No.CP1041) . |
| D.Fuel Wetting and Leakage | | |
| (1)Fuel wetting at J7 or J8 HMU connectors when removed | Serviceable NOTE: Wetting is moisture that does not increase in time. | |
| (2)Fuel wetting at J7 or J8 HMU connectors when installed | Not serviceable | Remove and replace cable and HMU (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040), (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002). |
| (3)Fuel leakage at J7 or J8 HMU connectors when removed | Serviceable | Dry connectors with AIR SOURCE FILTERED, DRY. Clean with isopropyl alcohol (Material No.CP1041) . NOTE: There is a leakage when you continuously see drops. |
| (4)Fuel leakage at J7 or J8 HMU connectors when installed | Not serviceable | Remove and replace cable and HMU (Ref. AMM TASK 73-21-50-000-040), (Ref. AMM TASK 73-21-50-000-040), (Ref. AMM TASK 73-21-50-400-040), (Ref. AMM TASK 73-21-50-400-040), (Ref. AMM TASK 73-21-50-000-041), (Ref. AMM TASK 73-21-50-000-041), (Ref. AMM TASK 73-21-50-400-041), (Ref. AMM TASK 73-21-50-400-041), (Ref. AMM TASK 73-21-10-000-002), (Ref. AMM TASK 73-21-10-400-002). |
| (5)Socket contact retention tests: (Ref. AMM TASK 73-21-50-750-003). | | |
| E.Turn the knurled nut clockwise, then counterclockwise to do a check of the self-locking property. | Self locking function defective | Replace harness |
| F.Clearance between the knurled ring and the central part at J9 or J10 T12 branch connector | Maximum clearance 0.04 in (1 mm) | Replace harness |
Subtask 73-21-50-410-079-A ** ON A/C NOT FOR ALL
A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 73-21-50-440-084-A ** ON A/C NOT FOR ALL Subtask 73-21-50-410-124-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR