Left Hand (LH) and Right Hand (RH) Strut 1 Fairings and Strut 1 Pads - Replacement of the Bonded Seal [CFML]

TASK 72-24-03-300-801-A
Left Hand (LH) and Right Hand (RH) Strut 1 Fairings and Strut 1 Pads - Replacement of the Bonded Seal

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

WARNING: USE PROTECTIVE GLOVES TO PREVENT INJURY FROM SHARP EDGES AND ROUGH SURFACES.

WARNING: DO NOT LET TITANIUM DUST COLLECT. DISCARD ALL TITANIUM WASTE IN AN APPROVED CONTAINER. TITANIUM DUST IS EXTREMELY FLAMMABLE.

WARNING: DO NOT USE WATER TO EXTINGUISH A TITANIUM FIRE. EXTINGUISH WITH AN APPROVED CHEMICAL FOR METAL FIRES.

WARNING: DO NOT USE HALOGEN PRODUCTS. TITANIUM ALLOY PARTS REACT TO CHLORINATED HYDROCARBONS. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY TO PERSONS CAN OCCUR.

CAUTION: WHEN YOU PROCESS TITANIUM PARTS, DO NOT USE TOOL FIXTURE DETAILS MADE OF OR COATED WITH CADMIUM, BISMUTH, TIN, ZINC, GOLD OR SILVER. IF YOU DO, THESE MATERIALS CAN HAVE AN UNWANTED EFFECT ON THE TITANIUM PARTS.

CAUTION: DO NOT USE TOOLS OR CONSUMABLE PRODUCTS THAT WERE USED TO BLEND MATERIALS OTHER THAN TITANIUM, BECAUSE TITANIUM IS EASILY CONTAMINATED.

CAUTION: WHEN YOU USE POWER TOOLS, MAKE SURE THAT YOU DO NOT CAUSE HEAT THAT WILL RESULT IN THERMAL STRESS. THERMAL STRESS CAN CAUSE ENGINE FAILURE.

ZONE: 210
ZONE: 400

1. Reason for the Job
This repair procedure gives instructions to replace the bonded seal on the LH and RH strut 1 fairings and strut 1 pads.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	AIR SOURCE FILTERED, DRY
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2242)	RTV 732
(Material No.CP2266)	RTV 102
(Material No.CP2699)	Panasolve Plus
(Material No.CP2734)	RTV 103
(Material No.CP2772)	abrasive cloth
(Material No.14SBA1)	Textile-Lint free Cotton -

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 702111
SPM 706612
Strut 1 Fairings - Bonded Seals
Strut 1 Pads - Bonded Seals

3. Job Set-up
Subtask 72-24-03-941-059-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 a 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 72-24-03-010-067-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 2M (6 FT) - ADJUSTABLE in position.

Subtask 72-24-03-040-059-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 maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-03-010-068-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

4. Procedure
Subtask 72-24-03-220-051-A

A. Dimensional Information

Table 801 - Dimensional Information

Description	Minimum Finish Dimension	Maximum Finish Dimension
Strut 1 fairings
DIM E		0.0255 in. (0.65 mm)
Strut 1 pads
DIM A	0.036 in. (0.91 mm)	0.055 in. (1.40 mm)
DIM B		0.12 in. (3.05 mm)
DIM C		0.1003 in. (2.55 mm)
DIM D		0.11 in. (2.79 mm)

Subtask 72-24-03-350-050-A

B. Remove the seal as follows:

CAUTION: REMOVE THE SEAL CAREFULLY TO PREVENT DAMAGE TO THE PART.

CAUTION: FOR ALUMINUM PARTS, MAKE SURE THAT YOU DO NOT REMOVE THE ANODIZED LAYER DURING THIS PROCEDURE.

(1) Remove completely the seal.
(2) Remove the remaining bonded material from the part. Immerse the part in the Panasolve Plus (Material No.CP2699) .

Subtask 72-24-03-120-050-A

C. Prepare the area to be bonded as follows:
(1) Make the surfaces (metallic part and seal) to be bonded rough with an abrasive cloth (Material No.CP2772) .

NOTE: You can use acetone (Material No.CP1039) to make rough the surface of the seal.

(2) Clean the metallic part area and the seal to be bonded with a clean Textile-Lint free Cotton - (Material No.14SBA1) soaked in isopropyl alcohol (Material No.CP1041) only SPM 702111.
(3) Dry the surfaces as follows:

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS
DO NOT LET THE PRESSURE BE MORE THAN 30 PSIG (200 KPA).

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(a) Blow the surfaces (metallic part and seal) to be bonded with an oil-free and AIR SOURCE FILTERED, DRY.

Subtask 72-24-03-360-050-A

D. Do a visual inspection of the area where you will bond the seal.
The deviations below are not permitted:
(1) Fretting, erosion and wear.
(2) Nicks, scratches and cracks.
(3) Dents.
(4) Missing anodized layer (for LH and RH strut 1 fairings only).

Subtask 72-24-03-360-051-A

E. Rebond the seal. SPM 706612 and the following instructions.

NOTE: As an alternative to RTV 732 (Material No.CP2242) , you can use RTV 102 (Material No.CP2266) or RTV 103 (Material No.CP2734) .

NOTE: You must respect the following conditions:

Temperature above 59 deg.F (15 deg.C),
Humidity between 40 and 70 percent.

(1) The adhesive coating thickness must be 0.008 in. (0.20 mm) maximum. If necessary, equalize overflow of adhesive.
(2) Do a dimensional inspection for the LH and RH strut 1 pads only. Make sure that the seal is aligned with the part surface. Refer to Para. 4.A. and see the sheet 2 and 3 of the figure:

Strut 1 Fairings - Bonded Seals

and the sheet 3 of the figure:

Strut 1 Pads - Bonded Seals

5. Close-up
Subtask 72-24-03-410-065-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 72-24-03-440-058-A

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

Subtask 72-24-03-410-066-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 13:04:05 UTC