DOC AIRBUS | AMM A320FEGT Harness - Wire Braid Repair (VRS3812) [IAE]
TASK 77-21-43-300-801-A
EGT Harness - Wire Braid Repair (VRS3812)
This task is to repair the EGT harness between the thermocouples and the junction box. This repair can be done in-situ.
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 77-21-43-941-053-A ** ON A/C NOT FOR ALL
Subtask 77-21-43-350-050-A ** ON A/C NOT FOR ALL
Subtask 77-21-43-410-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 03:18:21 UTC
EGT Harness - Wire Braid Repair (VRS3812)
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
ZONE: 400
1. Reason for the JobThis task is to repair the EGT harness between the thermocouples and the junction box. This repair can be done in-situ.
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 | 1 | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.V02-119) | corrosion resistant steel lockwire |
| (Material No.V02-391) | scotch |
| (Material No.V02-XXX) | tinned copper grounding strap |
| 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 71-13-00-010-010-A | Opening of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 71-13-00-410-010-A | Closing of the Fan Cowls 437AL(447AL),438AR(448AR) |
| TASK 78-30-00-040-012-A | Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance |
| TASK 78-30-00-440-012-A | Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance |
| TASK 78-32-00-010-010-A | Opening of the Thrust Reverser Halves |
| TASK 78-32-00-410-010-A | Closing of the Thrust Reverser Halves |
EGT Harness - Wire Braid Repair (VRS3812)Subtask 77-21-43-941-053-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 five minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(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 the FADEC 1(2).
Subtask 77-21-43-010-058-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 five minutes before you do this procedure.
(3) On the ENG section of the maintenance panel 50VU:
(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 the FADEC 1(2).
B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(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 77-21-43-040-055-A ** ON A/C NOT FOR ALL (1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
C. Deactivate the Thrust Reverser
Subtask 77-21-43-010-059-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) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012). D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010)
(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 77-21-43-350-050-A ** ON A/C NOT FOR ALL
A. Repair of the Worn or Damaged Wire Braid
(2) Put two layers of scotch (Material No.V02-391) tape around the wire bundle in the damaged area. Put a piece of tinned copper grounding strap (Material No.V02-XXX) (or equivalent) across the taped area in a longitudinal direction. Push the ends of the braid over the grounding strap as close together as possible.
(3) Put two layers of scotch (Material No.V02-391) around and over the braid 0.25 in. (6.35 mm) before each cut braid end.
(4) Move the loose ends of the braid apart and carefully fold them back and over the tape that you applied in the step above. Put two layers of scotch (Material No.V02-391) over the ends of the folded braid.
(5) Fill the space between the braid ends with scotch (Material No.V02-391) so that the repaired area has a constant diameter. Wind all the area with scotch (Material No.V02-391) .
(6) Wind the repaired area with stainless steel corrosion resistant steel lockwire (Material No.V02-119) 0.032 +0.002 in. or -0.002 in. (0.81 +0.05 mm or -0.05 mm).
(b) Start at the opposite end and wind the wire tightly and smoothly over the cable braid and the repaired rear as shown in the figure. Make sure that the wire overlaps the fiberglass tape.
(c) Wind approximately 2/3 of the length and leave the short end of the loop open. Continue to wind until the remaining 1/3 of the length is wound. The maximum repair length must not be more than 4.0 in. (101.6 mm).
(d) When you have made the last turn with the wire, put the end through the loop. Pull both ends of the wire tight. Cut away the extra wire so that the ends are not sticking out and will not come into contact with any part of the case or nacelle.
5. Close-upCAUTION:
LOOSE WIRES AT THE ENDS OF THE BRAID CAN MAKE HOLES IN THE INSULATION AND CAUSE AN ERRATIC OR ERRONEOUS INDICATION.
(1) Cut away the wire braid all around the cable in the damaged area with a pair of scissors. Make sure to cut away all loose strands from the ends of the wire braid. Move the two cut ends of the braid apart. (2) Put two layers of scotch (Material No.V02-391) tape around the wire bundle in the damaged area. Put a piece of tinned copper grounding strap (Material No.V02-XXX) (or equivalent) across the taped area in a longitudinal direction. Push the ends of the braid over the grounding strap as close together as possible.
(3) Put two layers of scotch (Material No.V02-391) around and over the braid 0.25 in. (6.35 mm) before each cut braid end.
(4) Move the loose ends of the braid apart and carefully fold them back and over the tape that you applied in the step above. Put two layers of scotch (Material No.V02-391) over the ends of the folded braid.
(5) Fill the space between the braid ends with scotch (Material No.V02-391) so that the repaired area has a constant diameter. Wind all the area with scotch (Material No.V02-391) .
(6) Wind the repaired area with stainless steel corrosion resistant steel lockwire (Material No.V02-119) 0.032 +0.002 in. or -0.002 in. (0.81 +0.05 mm or -0.05 mm).
WARNING:
USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.
(a) Cut a sufficient length of wire. Make a loop at one end and pull the wire tight across the length of the damaged area. Make sure that you touch the wire braid at both ends of the repair. (b) Start at the opposite end and wind the wire tightly and smoothly over the cable braid and the repaired rear as shown in the figure. Make sure that the wire overlaps the fiberglass tape.
(c) Wind approximately 2/3 of the length and leave the short end of the loop open. Continue to wind until the remaining 1/3 of the length is wound. The maximum repair length must not be more than 4.0 in. (101.6 mm).
(d) When you have made the last turn with the wire, put the end through the loop. Pull both ends of the wire tight. Cut away the extra wire so that the ends are not sticking out and will not come into contact with any part of the case or nacelle.
Subtask 77-21-43-410-053-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) Remove the access platform(s).
(3) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.
Subtask 77-21-43-440-051-A ** ON A/C NOT FOR ALL Subtask 77-21-43-410-058-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Close the thrust reverser halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.