DOC AIRBUS | AMM A320FRepair of Frayed Harness - Full Authority Digital Engine Control (FADEC) System [PW11]
TASK 73-21-00-300-801-A
Repair of Frayed Harness - Full Authority Digital Engine Control (FADEC) System
Use this procedure to tape wind and repair the frayed PEEK braid on all PEEK protective overbraid wiring harnesses.
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 73-21-00-941-067-A ** ON A/C NOT FOR ALL
Subtask 73-21-00-942-052-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:06:41 UTC
Repair of Frayed Harness - Full Authority Digital Engine Control (FADEC) System
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.
ZONE: 400
1. Reason for the JobUse this procedure to tape wind and repair the frayed PEEK braid on all PEEK protective overbraid wiring harnesses.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE |
| No specific | 1 | SIDE CUTTERS |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.P05-017) | wipers, cotton (Lint-Free) |
| (Material No.P05-044) | marker |
| (Material No.P05-136) | tape, high temperature glass cloth |
| (Material No.P05-534) | tape, high temperature glass fiber insulation |
| (Material No.P05-535) | tape self-adhering silicone rubber |
| (Material No.P11-078) | alcohol, isopropyl |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 400 | POWER PLANT, NACELLES AND PYLONS |
| FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 70-27-00-910-804-A | SPOP 208 - Degreasing of Parts by Solvent Wiping |
| TASK 71-00-00-860-832-A | Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC |
| TASK 71-13-00-010-802-A | Opening of the Fan Cowl Doors |
| TASK 71-13-00-410-802-A | Closing of the Fan Cowl Doors |
| TASK 73-21-00-200-805-A | Visual Examination of the FADEC System Wiring Harnesses (Ground Harness Check) |
| TASK 73-25-34-400-802-A | Installation of the Engine Interface Unit (EIU) |
| TASK 78-30-00-040-805-A | Deactivation of the Thrust Reverser System for Ground Maintenance |
| TASK 78-30-00-440-805-A | Reactivation of the Thrust Reverser System after Ground Maintenance |
| TASK 78-36-00-010-802-A | Opening of the Thrust Reverser Cowl-Doors |
| TASK 78-36-00-410-802-A | Closing of the Thrust Reverser Cowl-Doors |
Repair of Frayed Harness - FADEC System (Harness Locator)Subtask 73-21-00-941-067-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).
Subtask 73-21-00-010-070-A ** ON A/C NOT FOR ALL (1) Do the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).
B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
Subtask 73-21-00-040-060-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR.
(2) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.
C. Deactivation of the Thrust Reverser for Maintenance
Subtask 73-21-00-010-071-A ** ON A/C NOT FOR ALL WARNING:
YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-805). D. Get Access
(1) If necessary, open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
4. Procedure(1) If necessary, open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
NOTE: For WF01, WF02, WF06, WF07 it is not necessary to open the thrust reverser cowl-doors
For WC10, WC11 open the left thrust reverser cowl-door only
For WC08 open the right thrust reverser cowl-door only
For WC05, W03, W04 open the left and right thrust reverser cowl-doors.
For WC10, WC11 open the left thrust reverser cowl-door only
For WC08 open the right thrust reverser cowl-door only
For WC05, W03, W04 open the left and right thrust reverser cowl-doors.
CAUTION:
WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.
Subtask 73-21-00-300-050-A ** ON A/C NOT FOR ALL A. Repair of Frayed Harness
(1) Do a visual inspection as follows:
(a) Visually examine the damaged PEEK overbraid area.
(b) Make sure to examine all wire jackets seen below the overbraid. If damage is found on the wire jackets, examine for signs of metallic wire protection damage (Ref. AMM TASK 73-21-00-200-805).
(c) If the metallic wire protection is damaged, bent or broken do not make this repair. Replace the harness and return it to the supplier for Acceptance Test Procedure (ATP) and repair.
(2) Measure the frayed area location near the wiring harness backshell. If the frayed area is within 6.0 in. (152.4 mm) of the backshell, a repair is permitted, when all following conditions are met:
(a) The braid is damaged less than 90 degrees around the bundle.
(b) The damaged area is less than 0.39 in. (9.9 mm) in any direction.
(c) The wire jacket is not damaged.
(3) Do not make this repair, replace the harness and return it to the supplier for the supplier for ATP and repair, if one of the following conditions are met:
(a) The PEEK braid is damaged due to excessive heat or a hot object.
(b) The wire jacket is damaged.
(4) Clean the frayed area and 1.5 in. (38.1 mm) forward and aft of the frayed area with aP05-017 wipers, cotton (Lint-Free) P11-078 alcohol, isopropyl
(5) Wind the harness withP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(a) Wind the harness with theP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(b) Wind the tape aft and make an overlap of 50 percent.
(c) Finish the harness tape wind between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) aft of the frayed area.
(6) Wind the harness again with tape self-adhering silicone rubber (Material No.P05-535) as follows:
(a) Wind the harness with the tape self-adhering silicone rubber (Material No.P05-535) starting between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) forward of the high temperature tape.
(b) Wind the tape self-adhering silicone rubber (Material No.P05-535) aft and make an overlap of 50 percent.
(c) Finish the harness tape self-adhering silicone rubber (Material No.P05-535) wind between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) aft of theP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(d) Use hand pressure to attach the cut end of the tape self-adhering silicone rubber (Material No.P05-535) to the last tape wind.
(e) Wait for the tape self-adhering silicone rubber (Material No.P05-535) to bond. Do not move the tape self-adhering silicone rubber (Material No.P05-535) .
(f) Make sure that the tape self-adhering silicone rubber (Material No.P05-535) starts between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) forward of theP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation P05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(g) Make sure that theP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(7) Do a visual inspection as follows:
(a) Visually examine the tape self-adhering silicone rubber (Material No.P05-535) around the harness and make sure that no frayed PEEK overbraid can be seen.
(b) Make sure that noP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
(c) Make sure that no space between the tape self-adhering silicone rubber (Material No.P05-535) layers can be seen.
(8) Make sure that the worn condition that caused the frayed overbraid has been removed.
(9) Make sure that the harness routing is correct and does not touch the engine hardware, other than harness clamps, spring clips, or brackets.
(10) If necessary, replace the Functional Identification Number (FIN) as follows:
(a) Remove the FIN marker Identification (ID) tape as follows:
1 Temporarily apply two winds ofP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
2 Use a SIDE CUTTERS to carefully remove the FIN marker ID tape.
(b) Apply no more than two winds ofP05-136 tape, high temperature glass cloth P05-534 tape, high temperature glass fiber insulation
1 If the ID tape is at the backshell, then the ID tape must be no more than 5.9 in. (149.9 mm) from the backshell. It is not permitted for the ID tape to be on the end of the synthetic braid.
(c) Carefully cut the fiberglass tape and remove the temporary tape.
(d) Get the correct FIN marker text by the harness and connector. See Table 1 thru Table 9.
(e) Write the FIN marker text on the fiberglass tape with a marker (Material No.P05-044) .
(11) If necessary, repair overbraid that moves as follows:
(a) (b) (c) Continue to wind the tape with firm tension and approximately 50 percent overlap between 0.20 in. (5.08 mm) and 0.45 in. (11.43 mm) onto the backshell. End with a full over lap.
1 Do not cover part markings on the backshell.
(d) Continue to wind the tape with firm tension and approximately 50 percent overlap back to the start position. End with a full overlap.
(e) Carefully cut the tape.
(f) Apply tight hand pressure to the cut end of the tape for one minute to make sure the tape adheres.
(g) Examine the repair and make sure you can still read the full marking on the backshell.
5. Close-up(1) Do a visual inspection as follows:
(a) Visually examine the damaged PEEK overbraid area.
(b) Make sure to examine all wire jackets seen below the overbraid. If damage is found on the wire jackets, examine for signs of metallic wire protection damage (Ref. AMM TASK 73-21-00-200-805).
(c) If the metallic wire protection is damaged, bent or broken do not make this repair. Replace the harness and return it to the supplier for Acceptance Test Procedure (ATP) and repair.
(2) Measure the frayed area location near the wiring harness backshell. If the frayed area is within 6.0 in. (152.4 mm) of the backshell, a repair is permitted, when all following conditions are met:
(a) The braid is damaged less than 90 degrees around the bundle.
(b) The damaged area is less than 0.39 in. (9.9 mm) in any direction.
(c) The wire jacket is not damaged.
(3) Do not make this repair, replace the harness and return it to the supplier for the supplier for ATP and repair, if one of the following conditions are met:
(a) The PEEK braid is damaged due to excessive heat or a hot object.
(b) The wire jacket is damaged.
(4) Clean the frayed area and 1.5 in. (38.1 mm) forward and aft of the frayed area with a
(5) Wind the harness with
(a) Wind the harness with the
(b) Wind the tape aft and make an overlap of 50 percent.
(c) Finish the harness tape wind between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) aft of the frayed area.
(6) Wind the harness again with tape self-adhering silicone rubber (Material No.P05-535) as follows:
(a) Wind the harness with the tape self-adhering silicone rubber (Material No.P05-535) starting between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) forward of the high temperature tape.
(b) Wind the tape self-adhering silicone rubber (Material No.P05-535) aft and make an overlap of 50 percent.
(c) Finish the harness tape self-adhering silicone rubber (Material No.P05-535) wind between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) aft of the
(d) Use hand pressure to attach the cut end of the tape self-adhering silicone rubber (Material No.P05-535) to the last tape wind.
(e) Wait for the tape self-adhering silicone rubber (Material No.P05-535) to bond. Do not move the tape self-adhering silicone rubber (Material No.P05-535) .
(f) Make sure that the tape self-adhering silicone rubber (Material No.P05-535) starts between 0.75 in. (19.05 mm) and 1.25 in. (31.75 mm) forward of the
(g) Make sure that the
(7) Do a visual inspection as follows:
(a) Visually examine the tape self-adhering silicone rubber (Material No.P05-535) around the harness and make sure that no frayed PEEK overbraid can be seen.
(b) Make sure that no
(c) Make sure that no space between the tape self-adhering silicone rubber (Material No.P05-535) layers can be seen.
(8) Make sure that the worn condition that caused the frayed overbraid has been removed.
(9) Make sure that the harness routing is correct and does not touch the engine hardware, other than harness clamps, spring clips, or brackets.
(10) If necessary, replace the Functional Identification Number (FIN) as follows:
(a) Remove the FIN marker Identification (ID) tape as follows:
1 Temporarily apply two winds of
2 Use a SIDE CUTTERS to carefully remove the FIN marker ID tape.
(b) Apply no more than two winds of
1 If the ID tape is at the backshell, then the ID tape must be no more than 5.9 in. (149.9 mm) from the backshell. It is not permitted for the ID tape to be on the end of the synthetic braid.
(c) Carefully cut the fiberglass tape and remove the temporary tape.
(d) Get the correct FIN marker text by the harness and connector. See Table 1 thru Table 9.
(e) Write the FIN marker text on the fiberglass tape with a marker (Material No.P05-044) .
(11) If necessary, repair overbraid that moves as follows:
(a) (b) (c) Continue to wind the tape with firm tension and approximately 50 percent overlap between 0.20 in. (5.08 mm) and 0.45 in. (11.43 mm) onto the backshell. End with a full over lap.
1 Do not cover part markings on the backshell.
(d) Continue to wind the tape with firm tension and approximately 50 percent overlap back to the start position. End with a full overlap.
(e) Carefully cut the tape.
(f) Apply tight hand pressure to the cut end of the tape for one minute to make sure the tape adheres.
(g) Examine the repair and make sure you can still read the full marking on the backshell.
| ID | FIN MARKING |
| P2 | 4000KS−J2 |
| J101 | 4102VC |
| P103 | 4105VC−A |
| P403 | 403VC−A |
| P407 | 407VC−A |
Table - Harness (WF01) Connector ID and FIN Marker
| ID | FIN MARKING |
| P1 | 4000KS−J1 |
| P9 | 4609KS−J9 |
| P79 | 4107VC−A |
| J102 | 4104VC |
| J103 | 4105VC |
| P402 | 402VC−A |
| P406 | 406VC−A |
| P122 | 4106VC−A |
Table - Harness (WF02) Connector ID and FIN Marker
| ID | FIN MARKING |
| P4 | 4000KS−J4 |
| P6 | 4000KS−J6 |
| P10 | 4609KS−J10 |
| P12 | 4021EV−J12 |
| P14 | 4000KS−J14 |
| P16 | 4360KS−J16 |
| P18 | 4054KS−J18 |
| P20 | 4003DN−A |
| P24 | 4052KS−J24 |
| P32 | 4068KS−J32 |
| P33 | 4073KS−J33 |
| P36 | 4074KS−J36 |
| P39 | 4085KS−J39 |
| P41 | 4075KS−J41 |
| J43 | 4109VC |
| P48 | 4064KS−J48 |
| P51 | 4067KS−J51 |
| P54 | 4069KS−J54 |
| P56 | 4184KS−J56 |
| P57 | 4183KS−J21 |
| P59 | 4190KS−B |
| P61 | 4070KS−J38 |
| P64 | 4065KS−J64 |
| P66 | 4000JH−J66 |
| P101 | 4102VC−A |
| P106 | 4100VC−A |
| P107 | 4101VC−A |
| J110 | 4110VC |
Table - Harness (W03) Connector ID and FIN Marker
| ID | FIN MARKING |
| P3 | 4000KS−J3 |
| P5 | 4000KS−J5 |
| P11 | 4021EV−J11 |
| P13 | 4000KS−J13 |
| P17 | 4002DN−A |
| P19 | 4054KS−J19 |
| P28 | 4092KS−J28 |
| P44 | 4066KS−J44 |
| P45 | 4083KS−J45 |
| P47 | 4064KS−J47 |
| J55 | 4113VC |
| P58 | 4190KS−A |
| P63 | 4065KS−J63 |
| P67 | 4000JH−J67 |
| P69 | 4057KS−J56 |
| P102 | 4104VC−A |
| J105 | 4108VC |
| J106 | 4100VC |
| J107 | 4101VC |
| J108 | 4111VC |
| J109 | 4112VC |
Table - Harness (W04) Connector ID and FIN Marker
| ID | FIN MARKING |
| P7 | 4000KS−J7 |
| P491 | 491VC−A |
Table - Harness (WF06) Connector ID and FIN Marker
| ID | FIN MARKING |
| P8 | 4000KS−J8 |
| P494 | 494VC−A |
Table - Harness (WF07) Connector ID and FIN Marker
| ID | FIN MARKING |
| P15 | 4360KS−J15 |
| P21 | 4056KS−J21 |
| P25 | 4052KS−J25 |
| P26 | 4005KS−J26 |
| P27 | 4010KS−J27 |
| P30 | 100KM−J30 |
| P31 | 4055KS−J31 |
| P34 | 4002KS−J34 |
| P46 | 4090KS−J46 |
| P65 | 4008KS−J65 |
| P108 | 4111VC−A |
| P109 | 4112VC−A |
Table - Harness (WC08) Connector ID and FIN Marker
| ID | FIN MARKING |
| P29 | 4053KS−J29 |
| P35 | 4077KS−J35 |
| P38 | 4071KS−J38 |
| P40 | 4076KS−J40 |
| P52 | 4019KS−J52 |
| P53 | 4058KS−J56 |
| P110 | 4110VC−A |
Table - Harness (WC10) Connector ID and FIN Marker
| ID | FIN MARKING |
| P37 | 9XT−J34 |
| P68 | 4082KS−J68 |
| P105 | 4108VC−A |
Table - Harness (WC11) Connector ID and FIN Marker
Subtask 73-21-00-942-052-A ** ON A/C NOT FOR ALL
A. Put the aircraft back to its initial configuration.
(1) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
Subtask 73-21-00-410-066-A ** ON A/C NOT FOR ALL (1) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802)
B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) If opened, close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
Subtask 73-21-00-440-059-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) If opened, close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL, 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL, 462AR.
C. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).
Subtask 73-21-00-410-067-A ** ON A/C NOT FOR ALL