DOC AIRBUS | AMM A320FRepair of Wiring Harness with Fiber-Glass Tape and Lockwire [CFMB]
TASK 73-21-50-300-003-A
Repair of Wiring Harness with Fiber-Glass Tape and Lockwire
1. Reason for the Job
This repair procedure is an alternative to the repair procedure of Wiring Harness with Silicone Rubber Tape (Ref. TASK 73-21-50-300-00400).
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 73-21-50-941-113-A ** ON A/C NOT FOR ALL
Subtask 73-21-50-420-124-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:59:12 UTC
Repair of Wiring Harness with Fiber-Glass Tape and Lockwire
1. Reason for the Job
This repair procedure is an alternative to the repair procedure of Wiring Harness with Silicone Rubber Tape (Ref. TASK 73-21-50-300-00400).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | AR | SCISSORS |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.CP1041) | isopropyl alcohol |
| (Material No.CP2208) | fiberglass adhesive tape |
| (Material No.CP2628) | 3M-363 tape |
| (Material No.CP2674) | lint-free cloth |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 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 73-21-50-000-025-A | Removal of the CJ11L Harness |
| TASK 73-21-50-000-025-A-01 | Removal of the CJ11L Harness |
| TASK 73-21-50-000-026-A | Removal of the CJ11R Harness for SAC Engines |
| TASK 73-21-50-000-027-A | Removal of the CJ12L Harness |
| TASK 73-21-50-000-027-A-01 | Removal of the CJ12L Harness |
| TASK 73-21-50-000-028-A | Removal of the CJ12R Harness for SAC Engines |
| TASK 73-21-50-000-029-A | Removal of the CJ13 Harness |
| TASK 73-21-50-000-029-A-01 | Removal of the CJ13 Harness |
| 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 73-21-50-000-042-A | Removal of the HJ9 Harness for SAC Engines |
| TASK 73-21-50-000-043-A | Removal of the HJ10 Harness for SAC Engines |
| TASK 73-21-50-000-044-A | Removal of the HJ11 Harness for SAC Engines |
| TASK 73-21-50-000-045-A | Removal of the HJ12 Harness for SAC Engines |
| TASK 73-21-50-000-046-A | Removal of the HJ13 Harness for SAC Engines |
| TASK 73-21-50-400-025-A | Installation of the CJ11L Harness |
| TASK 73-21-50-400-025-A-01 | Installation of the CJ11L Harness |
| TASK 73-21-50-400-026-A | Installation of the CJ11R Harness for SAC Engines |
| TASK 73-21-50-400-027-A | Installation of the CJ12L Harness |
| TASK 73-21-50-400-027-A-01 | Installation of the CJ12L Harness |
| TASK 73-21-50-400-028-A | Installation of the CJ12R Harness for SAC Engines |
| TASK 73-21-50-400-029-A | Installation of the CJ13 Harness |
| TASK 73-21-50-400-029-A-01 | Installation of the CJ13 Harness |
| 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 73-21-50-400-042-A | Installation of the HJ9 Harness for SAC Engines |
| TASK 73-21-50-400-043-A | Installation of the HJ10 Harness for SAC Engines |
| TASK 73-21-50-400-044-A | Installation of the HJ11 Harness for SAC Engines |
| TASK 73-21-50-400-045-A | Installation of the HJ12 Harness for SAC Engines |
| TASK 73-21-50-400-046-A | Installation of the HJ13 Harness for SAC Engines |
| 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 |
| TASK 79-21-30-000-002-A | Removal of the DPM Harness |
| TASK 79-21-30-400-002-A | Installation of the DPM Harness |
Repair of Wiring HarnessSubtask 73-21-50-941-113-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) in position 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) in position to tell persons not to energize the FADEC 1(2).
Subtask 73-21-50-010-214-A ** ON A/C NOT FOR ALL (1) On the center pedestal, on the 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 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) in position to tell persons not to energize the 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 2M (6 FT) - ADJUSTABLE in position.
Subtask 73-21-50-040-157-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 2M (6 FT) - ADJUSTABLE in position.
C. Deactivation of the Thrust Reverser
Subtask 73-21-50-010-215-A ** ON A/C NOT FOR ALL WARNING:
MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(1) Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041). 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.
Subtask 73-21-50-020-123-A ** ON A/C NOT FOR ALL (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.
E. Removal of the Fully or not Fully Wiring Harness to Get Access to the Area
(2) Remove the CJ11R wiring harness (Ref. AMM TASK 73-21-50-000-026).
(3) Remove the CJ12L wiring harness (Ref. AMM TASK 73-21-50-000-027).
(4) Remove the CJ12R wiring harness (Ref. AMM TASK 73-21-50-000-028).
(5) Remove the CJ13 wiring harness (Ref. AMM TASK 73-21-50-000-029).
(6) Remove the HJ7 wiring harness (Ref. AMM TASK 73-21-50-000-040).
(7) Remove the HJ8 wiring harness (Ref. AMM TASK 73-21-50-000-041).
(8) Remove the HJ9 wiring harness (Ref. AMM TASK 73-21-50-000-042).
(9) Remove the HJ10 wiring harness (Ref. AMM TASK 73-21-50-000-043).
(10) Remove the HJ11 wiring harness (Ref. AMM TASK 73-21-50-000-044).
(11) Remove the HJ12 wiring harness (Ref. AMM TASK 73-21-50-000-045).
(12) Remove the HJ13 wiring harness (Ref. AMM TASK 73-21-50-000-046).
(13) Remove the DPM harness (Ref. AMM TASK 79-21-30-000-002).
4. ProcedureNOTE: Refer to the applicable task to remove the wiring harness and take all precautions necessary to do the repair procedure.
(1) Remove the CJ11L wiring harness (Ref. AMM TASK 73-21-50-000-025). (2) Remove the CJ11R wiring harness (Ref. AMM TASK 73-21-50-000-026).
(3) Remove the CJ12L wiring harness (Ref. AMM TASK 73-21-50-000-027).
(4) Remove the CJ12R wiring harness (Ref. AMM TASK 73-21-50-000-028).
(5) Remove the CJ13 wiring harness (Ref. AMM TASK 73-21-50-000-029).
(6) Remove the HJ7 wiring harness (Ref. AMM TASK 73-21-50-000-040).
(7) Remove the HJ8 wiring harness (Ref. AMM TASK 73-21-50-000-041).
(8) Remove the HJ9 wiring harness (Ref. AMM TASK 73-21-50-000-042).
(9) Remove the HJ10 wiring harness (Ref. AMM TASK 73-21-50-000-043).
(10) Remove the HJ11 wiring harness (Ref. AMM TASK 73-21-50-000-044).
(11) Remove the HJ12 wiring harness (Ref. AMM TASK 73-21-50-000-045).
(12) Remove the HJ13 wiring harness (Ref. AMM TASK 73-21-50-000-046).
(13) Remove the DPM harness (Ref. AMM TASK 79-21-30-000-002).
NOTE: This repair procedure is applicable for the fan wiring harnesses (HJ7, HJ8, HJ9, HJ10 and DPM ), 6 o'clock strut harnesses (HJ11, HJ12 and HJ13) and core engine wiring harnesses (CJ11L, CJ11R, CJ12L, CJ12R and CJ13).
NOTE: This repair procedure is temporary. You must do a permanent repair at not later than the next engine shop visit.
Subtask 73-21-50-350-054-A ** ON A/C NOT FOR ALL A. Cut All Loose Strands with End-Cutting Pliers.
Subtask 73-21-50-110-052-A ** ON A/C NOT FOR ALL NOTE: This step is for metallic sheath wiring harnesses only.
B. Cleaning of the Outer Sheath
Subtask 73-21-50-350-055-A ** ON A/C NOT FOR ALL WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
(1) Clean the outer sheath, in and around the area you will repair with lint-free cloth (Material No.CP2674) wet with isopropyl alcohol (Material No.CP1041) . C. Do These Steps to Repair the Harness
(1) Examine the area you will repair for penetration into harness Cu-Ni.
(2) Do these steps to apply the fiber-glass tape.
(a) Use the fiberglass adhesive tape (Material No.CP2208) or 3M-363 tape (Material No.CP2628) .
(b) Apply the tape around the braid as follows:
1 Start at Dimension A and wind the tape one-half width before the cut and stop one-half width after the cut area to Dimension B.
2 Apply the tape in the same direction with one-half width overlay at each turn.
3 Cut the tape with an SCISSORS.
(c) Do these steps to install the .015 steel corrosion-resistant lockwire, MS20995C15 around the outer sheath.
1 Make sure that the length of wire is sufficient to do an overlap on the tape and outer sheath at each end of the repair.
2 Hold the wire along the length of the worn area beginning from the left.
3 Start at the opposite end and apply the wire tightly and equally over the outer sheath to cover the repair area.
4 Make sure that the dimensions are correct.
5 Keep the short end of the loop and make sure that you can see it, when approximately two-thirds of the wound wire length is completed. Continue to wind the wire to complete the remaining distance shown as 1/3 X.
6 Put wire A into the loop after the final turn.
7 Cut the end B of the wire until its length is approximately 1/3 of the repair length.
8 Pull the loop end C until the wire at A goes under the wound wire and the end B goes out of view below the final turn.
9 Cut the wire end C flush.
Subtask 73-21-50-210-056-A ** ON A/C NOT FOR ALL (1) Examine the area you will repair for penetration into harness Cu-Ni.
NOTE: Penetration into harness Cu-Ni can cause an incorrect insulation of the harness.
(a) Penetration is not permitted, replace the harness. (2) Do these steps to apply the fiber-glass tape.
(a) Use the fiberglass adhesive tape (Material No.CP2208) or 3M-363 tape (Material No.CP2628) .
(b) Apply the tape around the braid as follows:
| Table 801 - Repair dimensions |
| DESCRIPTION | MINIMUM FINISH DIMENSION | MAXIMUM FINISH DIMENSION | MAXIMUM IN PROCESS DIMENSION |
|---|---|---|---|
| | | | |
| Dimension A | 0.5 in. (12.7 mm) | 1.0 in. (25.4 mm) | |
| Dimension B | 0.5 in. (12.7 mm) | 1.0 in. (25.4 mm) | |
| Dimension C | | | 1.25 in. (31.75 mm) |
2 Apply the tape in the same direction with one-half width overlay at each turn.
3 Cut the tape with an SCISSORS.
(c) Do these steps to install the .015 steel corrosion-resistant lockwire, MS20995C15 around the outer sheath.
1 Make sure that the length of wire is sufficient to do an overlap on the tape and outer sheath at each end of the repair.
2 Hold the wire along the length of the worn area beginning from the left.
3 Start at the opposite end and apply the wire tightly and equally over the outer sheath to cover the repair area.
4 Make sure that the dimensions are correct.
5 Keep the short end of the loop and make sure that you can see it, when approximately two-thirds of the wound wire length is completed. Continue to wind the wire to complete the remaining distance shown as 1/3 X.
6 Put wire A into the loop after the final turn.
7 Cut the end B of the wire until its length is approximately 1/3 of the repair length.
8 Pull the loop end C until the wire at A goes under the wound wire and the end B goes out of view below the final turn.
9 Cut the wire end C flush.
D. Examine the Repaired Areas of the Harness for a Correct Repair
(1) A bad wire wind up is not permitted, do the repair again.
Subtask 73-21-50-210-057-A ** ON A/C NOT FOR ALL (1) A bad wire wind up is not permitted, do the repair again.
E. Record this Repair in the Engine Log-Book
5. Close-upSubtask 73-21-50-420-124-A ** ON A/C NOT FOR ALL
A. Installation of the Wiring Harness (Refer to the Applicable Task):
(1) Install the CJ11L wiring harness (Ref. AMM TASK 73-21-50-400-025).
(2) Install the CJ11R wiring harness (Ref. AMM TASK 73-21-50-400-026).
(3) Install the CJ12L wiring harness (Ref. AMM TASK 73-21-50-400-027).
(4) Install the CJ12R wiring harness (Ref. AMM TASK 73-21-50-400-028).
(5) Install the CJ13 wiring harness (Ref. AMM TASK 73-21-50-400-029).
(6) Install the HJ7 wiring harness (Ref. AMM TASK 73-21-50-400-040).
(7) Install the HJ8 wiring harness (Ref. AMM TASK 73-21-50-400-041).
(8) Install the HJ9 wiring harness (Ref. AMM TASK 73-21-50-400-042).
(9) Install the HJ10 wiring harness (Ref. AMM TASK 73-21-50-400-043).
(10) Install the HJ11 wiring harness (Ref. AMM TASK 73-21-50-400-044).
(11) Install the HJ12 wiring harness (Ref. AMM TASK 73-21-50-400-045).
(12) Install the HJ13 wiring harness (Ref. AMM TASK 73-21-50-400-046).
(13) Install the DPM harness (Ref. AMM TASK 79-21-30-400-002).
Subtask 73-21-50-410-164-A ** ON A/C NOT FOR ALL (1) Install the CJ11L wiring harness (Ref. AMM TASK 73-21-50-400-025).
(2) Install the CJ11R wiring harness (Ref. AMM TASK 73-21-50-400-026).
(3) Install the CJ12L wiring harness (Ref. AMM TASK 73-21-50-400-027).
(4) Install the CJ12R wiring harness (Ref. AMM TASK 73-21-50-400-028).
(5) Install the CJ13 wiring harness (Ref. AMM TASK 73-21-50-400-029).
(6) Install the HJ7 wiring harness (Ref. AMM TASK 73-21-50-400-040).
(7) Install the HJ8 wiring harness (Ref. AMM TASK 73-21-50-400-041).
(8) Install the HJ9 wiring harness (Ref. AMM TASK 73-21-50-400-042).
(9) Install the HJ10 wiring harness (Ref. AMM TASK 73-21-50-400-043).
(10) Install the HJ11 wiring harness (Ref. AMM TASK 73-21-50-400-044).
(11) Install the HJ12 wiring harness (Ref. AMM TASK 73-21-50-400-045).
(12) Install the HJ13 wiring harness (Ref. AMM TASK 73-21-50-400-046).
(13) Install the DPM harness (Ref. AMM TASK 79-21-30-400-002).
B. 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 73-21-50-440-107-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.
C. Activation of the Thrust Reverser
(1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-081-041).
Subtask 73-21-50-410-165-A ** ON A/C NOT FOR ALL (1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-081-041).