Repair of Wiring Harness with Silicone Rubber Tape [CFMB]

TASK 73-21-50-300-004-A
Repair of Wiring Harness with Silicone Rubber Tape

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 Fiber-Glass Tape and Lockwire (Ref. TASK 73-21-50-300-00300).
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	PLIERS - END-CUTTING
No specific	AR	SCISSORS
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2674)	lint-free cloth
(Material No.CP2682)	silicone rubber tape

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-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 Harness

3. Job Set-up
Subtask 73-21-50-941-114-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 73-21-50-010-216-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 73-21-50-040-158-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 73-21-50-010-217-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 73-21-50-020-124-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 73-21-50-000-025).
(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)

4. Procedure

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 73-21-50-350-056-A ** ON A/C NOT FOR ALL

A. Prepare the Surface of the Harness
(1) Alternative Procedure Available
(a) Cut all loose parts of the outer sheath with PLIERS - END-CUTTING.
(2) Alternative Procedure
(a) Cut all loose strands of the metallic sheath with PLIERS - END-CUTTING.

Subtask 73-21-50-110-053-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 73-21-50-350-057-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 and for foreign material entrapped in the metallic inner sheath.

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 silicone rubber tape:

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

(a) Use the silicone rubber tape (Material No.CP2682) .
(b) Apply the tape around the sheath 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.

Subtask 73-21-50-210-058-A ** ON A/C NOT FOR ALL

D. Examine the Repaired Areas of the Harness for a Correct Repair
(1) A bad tape bonding on the parent material.
(a) No lift is permitted, do the repair again.
(2) A bad tape winding up.
(a) No nick and dent is permitted, do the repair again.

Subtask 73-21-50-210-059-A ** ON A/C NOT FOR ALL

E. Record this Repair in the Engine Log-Book

5. Close-up
Subtask 73-21-50-420-125-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 73-21-50-410-166-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 73-21-50-440-108-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 73-21-50-410-167-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 02:59:13 UTC