Engine Kit - Strut 1 Fairings and Strut 1 Outer Fitting - Blending and Spot Touch-Up [CFML]

TASK 72-24-03-300-804-A
Engine Kit - Strut 1 Fairings and Strut 1 Outer Fitting - Blending and Spot Touch-Up

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.

ZONE: 210
ZONE: 400

1. Reason for the Job
This repair procedure gives instructions to blend and do the spot touch-up of the strut 1 fairings and the strut 1 outer fitting.
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	2	AIR SOURCE FILTERED, DRY
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1039)	acetone
(Material No.CP1040)	methyl ethyl ketone
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2721)	CS 333 X
(Material No.14SBA1)	Textile-Lint free Cotton -
No specific	S1096- aluminum alloys etchant
No specific	S1208-BOLLORE FUN-NG (green color)

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 72-24-03-000-801-A	Removal of the Strut 1
TASK 72-24-03-400-801-A	Installation of the Strut 1
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 703211
SPM 703212
SPM 703221
SPM 703222
SPM 704111
SPM 704112
SPM 705311
SPM 706214
SPM 706423
Strut 1 Fairings - Blending Area
Strut 1 Outer Fitting - Blending Area
Strut 1 Outer Fitting and Fairings - Blending Limits and Painting Overspray
Strut 1 Fairings - Area to be painted
Strut 1 Outer Fitting - Area to be painted

3. Job Set-up
Subtask 72-24-03-941-064-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 the 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 the WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 72-24-03-010-077-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 the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 72-24-03-040-064-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 maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-03-010-078-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

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

Subtask 72-24-03-220-054-A

A. Dimensional Information

Strut 1 Fairings - Blending Area

Strut 1 Outer Fitting and Fairings - Blending Limits and Painting Overspray

Description	Minimum In-Process Dimension	Maximum In-Process Dimension	Minimum Finish Dimension	Maximum Finish Dimension	Reference Dimension
STRUT 1 OUTER FITTING
SURFACE F*	-	-	-	40 cm2 (6 in.2)	-
SURFACE M**	-	-	-	100 cm2 (15.5 in.2)	-
STRUT 1 FAIRINGS
Dim A	-	-	10 mm (0.39 in.)	-	-
Dim B	-	-	50 mm (1.97 in.)	-	-
Dim C	-	-	60 mm (2.36 in.)	-	-
Dim D	-	-	70 mm (2.76 in.)	-	-
SURFACE G*	-	-	-	100 cm2 (15.5 in.2)	-
SURFACE N**	-	-	-	100 cm2 (15.5 in.2)	-
FOR ALL
Dim P	-	-	-	0.6 mm (0.024 in.)	-
Dim X	-	-	40xP	-	-
Dim Y	-	-	40xP	-	-
Dim S	-	30 mm (1.18 in.)	-	-	-

* Total surface blended on the part
** Total surface of OAS touch-up with alodine and paint.

Subtask 72-24-03-020-053-A

B. Remove the parts to be repaired, if needed (Ref. AMM TASK 72-24-03-000-801).

Subtask 72-24-03-110-050-A

C. Cleaning
(1) If necessary, clean the part with a Textile-Lint free Cotton - (Material No.14SBA1) moistened with acetone (Material No.CP1039) or methyl ethyl ketone (Material No.CP1040) or isopropyl alcohol (Material No.CP1041) .

Subtask 72-24-03-350-053-A

D. Inspection of the Part to be Repaired
(1) Measure the total surface of the areas repaired before.
(a) Make sure that after the repair, SURFACES G and N or F and M will still be in the limits, go to Paragraph 4.A. "Dimensional Information".
(2) If you need to blend, go to Paragraph 4.E. "Blending".
(3) If you need to do the spot touch-up, go to Paragraph 4.G. "Spot touch-up".

Subtask 72-24-03-350-054-A

WARNING: USE PERSONAL PROTECTION EQUIPMENT. METAL PARTICLES CAN CAUSE DAMAGE, INJURY OR IRRITATION.

CAUTION: MAKE SURE THAT THE BLENDED AREAS MAKE A SMOOTH CONTOUR INTO THE ADJACENT AREAS. IF NOT, DAMAGE TO THE PART CAN OCCUR.

CAUTION: DO THE TOUCH-UP OF THE OXIDE FILM COATING MAXIMUM 4 HOURS AFTER THE BLENDING PROCEDURE. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE PART CAN OCCUR.

E. Blending of the Areas to be Repaired SPM 704112 or SPM 704111.

NOTE: Remove a minimum of material more than the depth of deviation while blending.

(1)

Strut 1 Fairings - Blending Area

Strut 1 Outer Fitting - Blending Area

Strut 1 Outer Fitting and Fairings - Blending Limits and Painting Overspray

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 PSI (207 KPA).

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

(2) Blow the blended surfaces with AIR SOURCE FILTERED, DRY and de-oiled.
(3) Do a Fluorescent Penetrant Inspection (FPI). Go to Para 4.F. "FPI of the Blended Areas".

Subtask 72-24-03-230-050-A

F. FPI of the Blended Areas
(1) Clean with a Textile-Lint free Cotton - (Material No.14SBA1) moistened with acetone (Material No.CP1039) or methyl ethyl ketone (Material No.CP1040) or isopropyl alcohol (Material No.CP1041) .
(2) Swab etch with S1096- aluminum alloys etchant SPM 705311.
(3) Do a FPI SPM 703211 or SPM 703212 or SPM 703221 or SPM 703222. No cracks are permitted.
(4) Do the spot touch-up on aluminum alloy parts. Go to Para 4.G. "Spot Touch-up of the Area to be Repaired on Aluminum Alloy Parts".

Subtask 72-24-03-380-050-A

G. Spot Touch-up of the Area to be Repaired on Aluminum Alloy Parts
(1) If necessary, clean the part with a Textile-Lint free Cotton - (Material No.14SBA1) moistened in acetone (Material No.CP1039) or methyl ethyl ketone (Material No.CP1040) or isopropyl alcohol (Material No.CP1041) .
(2) Brush the areas to be repaired locally with strips of CS 333 X (Material No.CP2721) , grade 400 minimum SPM 704111.
(a)

Strut 1 Fairings - Blending Area

Strut 1 Outer Fitting - Blending Area

(b) Make sure that SURFACES M or N are in the limits, go to Para 4.A. "Dimensional Information".
(3) Blow the repaired surfaces:

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 PSI (207 KPA).

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

(a) Blow the repaired surfaces with AIR SOURCE FILTERED, DRY and de-oiled.
(4) Clean the part with a Textile-Lint free Cotton - (Material No.14SBA1) moistened in acetone (Material No.CP1039) or methyl ethyl ketone (Material No.CP1040) or isopropyl alcohol (Material No.CP1041) .
(5) Do the spot touch-up as follows SPM 706214:
(a) If the surface to be repaired is less than or equal to 2 cm2 (0.31 in.2):
1 Do the spot touch-up of the sulfuric anodizing and check the protective coating SPM 706214.
(b) If the surface to be repaired is more than 2 cm2 (0.31 in.2):
1 Do the spot touch-up of the sulfuric anodizing and check the protective coating SPM 706214.
2 Apply and cure S1208-BOLLORE FUN-NG (green color) paint with overspray on adjacent areas in repeated thin coats SPM 706423.

NOTE: You must respect the following conditions:

Temperature between 15 deg.C (59 deg.F) and 25 deg.C (77 deg.F)
Humidity between 40% and 70%.

Strut 1 Fairings - Area to be painted

Strut 1 Outer Fitting - Area to be painted

b Make sure that SURFACES M or N are in the limits. Go to Para 4.A. "Dimensional Information".
c

Strut 1 Outer Fitting and Fairings - Blending Limits and Painting Overspray

e Make sure that the part remains at a temperature between 65 deg.C (149 deg.F) and 75 deg.C (167 deg.F) during the curing.

NOTE: It is permitted to use an infrared system with feedback control for curing.

3 Check S1208-BOLLORE FUN-NG (green color) paint SPM 706423.

Subtask 72-24-03-420-056-A

H. Install the repaired part, if needed, on the engine (Ref. AMM TASK 72-24-03-400-801).

5. Close-up
Subtask 72-24-03-410-073-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 72-24-03-440-062-A

B. Reactivation of the Thrust Reverser System after Maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-24-03-410-074-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 02:52:54 UTC