Application of Silicone Tape (68N and 69N) Patch for Protection of the Branch [CFML]

TASK 73-21-60-340-801-A
Application of Silicone Tape (68N and 69N) Patch for Protection of the Branch

ZONE: 210
ZONE: 400

1. Reason for the Job
This repair procedure gives instructions for the application of silicone rubber tape for protection of the harness outer sheath.
Ref Fig N_MP_732160_991_35500—Copper Braid Overview and Ref Fig N_MP_732160_991_35600—Winding Procedure.

NOTE: You can use equivalent alternatives for standard tools and equipment.

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	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2674)	lint-free cloth
(Material No.CP2939)	silicone tape 68N red-brown
(Material No.CP2940)	silicone tape 69N black

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
SPM 702123
Winding Procedure
Copper Braid Overview

3. Job Set-up
Subtask 73-21-60-941-084-A

A. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of 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 FADEC 1(2).

Subtask 73-21-60-010-102-A

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-21-60-040-064-A

C. Deactivation of the Thrust Reverser System for Maintenance

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 ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 73-21-60-010-103-A

D. Get Access
(1) Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 73-21-60-990-051-A

E. Applicable Parts
(1) The subsequent table gives a list of the part numbers that are applicable to this repair. All part numbers are applicable to all paragraphs unless specified differently.

Table 801 - Applicable Parts

Part Number	Service Bulletin	CSN	Designation
362-085-505-0	72-0001	(01-030, 73-21-60)	Harness HJ3A
362-085-605-0	72-0001	(02-070, 73-21-60)	Harness HJ3B
362-085-704-0	72-0001	(03-180, 73-21-60)	Harness HJ5A
362-085-705-0	72-0015	(03-180 00A, 73-21-60)
362-085-804-0	72-0001	(04-190, 73-21-60)	Harness HJ5B
362-085-805-0	72-0015	(04-190 00A, 73-21-60)
362-085-904-0	72-0001	(05-460, 73-21-60)	Harness HJ6A
362-085-905-0	72-0015	(05-460 00A, 73-21-60)
362-085-906-0	73-0042	(05-460 00B, 73-21-60)
362-086-004-0	72-0001	(06-160, 73-21-60)	Harness HJ6B
362-086-005-0	73-0042	(06-160 00A, 73-21-60)
362-086-104-0	72-0001	(07-040, 73-21-60)	Harness HJ7
362-086-204-0	72-0001	(08-210, 73-21-60)	Harness HJ8A
362-086-205-0	72-0015	(08-210 00A, 73-21-60)
362-086-206-0	73-0019	(08-210 00B, 73-21-60)
362-086-304-0	72-0001	(09-140, 73-21-60)	Harness HJ8B
362-086-305-0	72-0015	(09-140 00A, 73-21-60)
362-086-306-0	73-0012	(09-140 00B, 73-21-60)
362-917-001-0	73-0016	(10-050, 73-21-60)	Harness HJ9B

4. Procedure

WARNING: REFER TO THE PRODUCT LABEL AND THE MANUFACTURER'S (MATERIAL) SAFETY DATA SHEET (SDS) FOR INSTRUCTIONS ON THE HAZARDS, STORAGE, SAFE HANDLING AND CORRECT USE OF CONSUMABLE PRODUCTS.

Subtask 73-21-60-220-054-A

A. Dimensional Information

Winding Procedure

NOTE: Dimensions are given in millimeters with inches in parentheses.

Table 802 - Dimensional Information

Description	Minimum In-Process Dimension	Maximum In-Process Dimension	Minimum Finish Dimension	Maximum Finish Dimension	Reference Dimension
DIM. A	-	-	-	50 mm (1.97 in.)	-
DIM. B	-	-	25 mm (0.98 in.)	-	-
DIM. C	-	-	10 mm (0.39 in.)	-	-

Subtask 73-21-60-010-104-A

B. Loosen the clamps as required until the area to repair is clear.

Subtask 73-21-60-220-055-A

C. Do a visual inspection of the area to repair

Copper Braid Overview

Winding Procedure

NOTE: This repair only applies on the external heat-shrinkable tubing.

NOTE: Repairs are allowed between attachments points only.

NOTE: Repairs under the attachment points are not permitted.

Subtask 73-21-60-220-056-A

D. Do a dimensional inspection of the area to repair:

Winding Procedure

(1) You cannot use this repair procedure if:

The length of the area to repair is more than 50 mm (1.97 in.) (DIM. A), or
The distance between the area to repair and the nearest repaired area is less than 35 mm (1.38 in.) (DIM. B + DIM. C), or
The distance between the area to repair and the nearest attachment point is less than 35 mm (1.38 in.) (DIM. B + DIM. C).

Subtask 73-21-60-110-051-A

E. Clean the external heat-shrinkable tubing in and around the area to repair with a lint-free cloth (Material No.CP2674) moist with isopropyl alcohol (Material No.CP1041) SPM 702123.

Subtask 73-21-60-220-057-A

F. Examine the area to repair as follows:
(1) Remove all material on the area to repair.

NOTE: Degradation of the copper braid is not permitted.

Copper Braid Overview

Subtask 73-21-60-350-053-A

G. Wind the silicone tape 68N red-brown (Material No.CP2939) or the silicone tape 69N black (Material No.CP2940) around the harness branch as follows:

Winding Procedure

(1) Extend the ribbon 25 mm (0.98 in.) (DIM. B) from the area to repair limits.
(2) Do a 50% overlap while winding.
(3) Continue the winding in the opposite direction with the same overlap.
(4) Finish the winding with one complete turn.

Subtask 73-21-60-350-054-A

H. Do a visual inspection of the repaired area:
(1) Make sure that the tape is fully attached.

NOTE: Nicks and perforations are not permitted.

Subtask 73-21-60-410-080-A

I. Put the harness back on its supports.

5. Close-up
Subtask 73-21-60-410-081-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 73-21-60-440-058-A

B. Do the reactivation of the thrust reverser system after nacelle maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 73-21-60-410-082-A

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:05:41 UTC