Repair of Wiring Harness with Fiber-Glass Tape and Lockwire [CFMI]

TASK 73-21-50-300-001-A
Repair of Wiring Harness with Fiber-Glass Tape and Lockwire

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This repair procedure is an alternative to the repair procedure of Wiring Harness with Silicone Rubber Tape (Ref. TASK 73-21-50-300-00200).
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)

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 73-21-50-000-001-A	Removal of the CJ11L Harness
TASK 73-21-50-000-002-A	Removal of the CJ11R Harness
TASK 73-21-50-000-003-A	Removal of the CJ12L Harness
TASK 73-21-50-000-004-A	Removal of the CJ12R Harness
TASK 73-21-50-000-005-A	Removal of the CJ13 Harness
TASK 73-21-50-000-006-A	Removal of J7 Harness
TASK 73-21-50-000-007-A	Removal of J8 Harness
TASK 73-21-50-000-008-A	Removal of the J9 Harness
TASK 73-21-50-000-009-A	Removal of the J10 Harness
TASK 73-21-50-000-010-A	Removal of the J11 Harness
TASK 73-21-50-000-011-A	Removal of the J12 Harness
TASK 73-21-50-000-012-A	Removal of the J13 Harness
TASK 73-21-50-400-001-A	Installation of the CJ11L Harness
TASK 73-21-50-400-002-A	Installation of the CJ11R Harness
TASK 73-21-50-400-003-A	Installation of the CJ12L Harness
TASK 73-21-50-400-004-A	Installation of the CJ12R Harness
TASK 73-21-50-400-005-A	Installation of the CJ13 Harness
TASK 73-21-50-400-006-A	Installation of the J7 Harness
TASK 73-21-50-400-007-A	Installation of the J8 Harness
TASK 73-21-50-400-008-A	Installation of the J9 Harness
TASK 73-21-50-400-009-A	Installation of the J10 Harness
TASK 73-21-50-400-010-A	Installation of the J11 Harness
TASK 73-21-50-400-011-A	Installation of the J12 Harness
TASK 73-21-50-400-012-A	Installation of the J13 Harness
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Repair of Wiring Harness
Installation of the Stainless Wire

3. Job Set-up
Subtask 73-21-50-941-111-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 73-21-50-010-210-A ** ON A/C NOT FOR ALL

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 73-21-50-040-155-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser

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).

Subtask 73-21-50-010-211-A ** ON A/C NOT FOR ALL

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 73-21-50-020-121-A ** ON A/C NOT FOR ALL

E. Removal of the Fully or not Fully Wiring Harness to Get Access to the Area

NOTE: 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 73-21-50-000-001).
(2) Remove the CJ11R wiring harness (Ref. AMM TASK 73-21-50-000-002).
(3) Remove the CJ12L wiring harness (Ref. AMM TASK 73-21-50-000-003).
(4) Remove the CJ12R wiring harness (Ref. AMM TASK 73-21-50-000-004).
(5) Remove the CJ13 wiring harness (Ref. AMM TASK 73-21-50-000-005).
(6) Remove the J7 wiring harness (Ref. AMM TASK 73-21-50-000-006).
(7) Remove the J8 wiring harness (Ref. AMM TASK 73-21-50-000-007).
(8) Remove the J9 wiring harness (Ref. AMM TASK 73-21-50-000-008).
(9) Remove the J10 wiring harness (Ref. AMM TASK 73-21-50-000-009).
(10) Remove the J11 wiring harness (Ref. AMM TASK 73-21-50-000-010).
(11) Remove the J12 wiring harness (Ref. AMM TASK 73-21-50-000-011).
(12) Remove the J13 wiring harness (Ref. AMM TASK 73-21-50-000-012).

4. Procedure

NOTE: This repair procedure is applicable for the fan wiring harnesses (J7, J8, J9 and J10), 6 o'clock strut harnesses (J11, J12 and J13) 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 at the next engine shop visit.

Subtask 73-21-50-350-050-A ** ON A/C NOT FOR ALL

A. Cut All Loose Strands with End-Cutting Pliers

NOTE: This step is for metallic sheath wiring harnesses only.

Subtask 73-21-50-110-050-A ** ON A/C NOT FOR ALL

B. Cleaning of the Outer Sheath

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) .

Subtask 73-21-50-350-051-A ** ON A/C NOT FOR ALL

C. Do These Steps to Repair the Harness
(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.

Repair of Wiring Harness ** ON A/C NOT FOR ALL

(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)

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.

Installation of the Stainless Wire ** ON A/C NOT FOR ALL

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 73-21-50-210-052-A ** ON A/C NOT FOR ALL

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 73-21-50-210-053-A ** ON A/C NOT FOR ALL

E. Record this Repair in the Engine Log-Book

5. Close-up
Subtask 73-21-50-420-122-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 73-21-50-400-001).
(2) Install the CJ11R wiring harness (Ref. AMM TASK 73-21-50-400-002).
(3) Install the CJ12L wiring harness (Ref. AMM TASK 73-21-50-400-003).
(4) Install the CJ12R wiring harness (Ref. AMM TASK 73-21-50-400-004).
(5) Install the CJ13 wiring harness (Ref. AMM TASK 73-21-50-400-005).
(6) Install the J7 wiring harness (Ref. AMM TASK 73-21-50-400-006).
(7) Install the J8 wiring harness (Ref. AMM TASK 73-21-50-400-007).
(8) Install the J9 wiring harness (Ref. AMM TASK 73-21-50-400-008).
(9) Install the J10 wiring harness (Ref. AMM TASK 73-21-50-400-009).
(10) Install the J11 wiring harness (Ref. AMM TASK 73-21-50-400-010).
(11) Install the J12 wiring harness (Ref. AMM TASK 73-21-50-400-011).
(12) Install the J13 wiring harness (Ref. AMM TASK 73-21-50-400-012).

Subtask 73-21-50-410-160-A ** ON A/C NOT FOR ALL

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 73-21-50-440-105-A ** ON A/C NOT FOR ALL

C. Activation of the Thrust Reverser
(1) Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-081-041).

Subtask 73-21-50-410-161-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:56:42 UTC