Repair of the Stainless Steel Braid [CFML]

TASK 73-21-60-300-801-A
Repair of the Stainless Steel Braid

ZONE: 210
ZONE: 400

1. Reason for the Job
This repair procedure gives instructions for the application of stainless steel wire for protection of the harness outer stainless steel braid.

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.CP2628)	3M-363 tape
(Material No.CP2674)	lint-free cloth
No specific	stainless steel wire MS20995C15

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
Maximum Defective Area
Maximum Defective Area Angle
Adhesive Tape
Stainless Steel Wire
Knot

3. Job Set-up
Subtask 73-21-60-941-083-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 73-21-60-010-099-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 73-21-60-040-063-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 73-21-60-010-100-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 73-21-60-990-050-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	Engine
362-086-204-0	72-0001	(08-210,73-21-60)	Harness HJ8A	LEAP 1A

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 73-21-60-220-050-A

A. Dimensional Information

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 (Defective area)	-	-	-	30 mm (1.18 in.)	-
DIM. B (Tape width)	-	-	-	50 mm (1.97 in.)	-
DIM. D (Angle defective area)	-	-	-	90 degrees	-
DIM. X (Stainless steel wire)	-	-	50 mm (1.97 in.)	-	-

Subtask 73-21-60-010-101-A

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

Subtask 73-21-60-220-051-A

C. Do a visual inspection of the area to repair.

NOTE: This repair only applies to harness branches in stainless steel.

Subtask 73-21-60-220-052-A

D. Do a dimensional inspection of the area to repair:
(1) You cannot use this repair procedure if:

The length of the area to repair is more than 30 mm (1.18 in.) (DIM. A)
Maximum Defective Area
, or
The distance between the area to repair and the nearest repaired area is less than 50 mm (1.97 in.), or
The defective area angle is more than 90 degrees (DIM. D).
Maximum Defective Area Angle

Subtask 73-21-60-110-050-A

E. Clean the external sleeve in and around the area to repair with lint-free cloth (Material No.CP2674) made moist with isopropyl alcohol (Material No.CP1041) .

Subtask 73-21-60-220-053-A

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

NOTE: Degradation of the copper braid is not permitted.

Subtask 73-21-60-350-050-A

G. Wind the 3M-363 tape (Material No.CP2628) (model 50 mm (2 in.) wide) as follows:

Adhesive Tape

(1) Make a minimum of two turns with the 3M-363 tape (Material No.CP2628) .
(2) Center the 3M-363 tape (Material No.CP2628) on the defective area.

Subtask 73-21-60-350-051-A

H. Apply the stainless steel wire MS20995C15 as follows:

Stainless Steel Wire

Knot

(1) Hold the wire along the length of the beginning of the worn area from the left.
(2) Start at the opposite end and apply the wire tightly and equally over the outer sheath to put the cover on the repair area.
(3) 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.
(4) Continue to wind the wire to complete the remaining distance shown as 1/3 DIM. X.

Knot

(5) Put wire "1" into the loop after the final turn.
(6) Pull the loop end "3" until the wire at "1" goes under the wound wire.
(7) Cut the wire ends "2" and "3" flush.

Subtask 73-21-60-350-052-A

I. Do a visual inspection of the repaired area:
(1) A bad wire wind-up is not permitted. If necessary, do the repair again.

Subtask 73-21-60-410-077-A

J. Put the harness back on its supports.

5. Close-up
Subtask 73-21-60-410-078-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 73-21-60-440-057-A

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

Subtask 73-21-60-410-079-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 03:05:40 UTC