Kit Engine - Flow Path Panels 1 to 4 - Blending and Spot Touch-up [CFML]

TASK 72-24-09-320-801-A
Kit Engine - Flow Path Panels 1 to 4 - 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 flow path panels 1 to 4.
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.CP1040)	Methyl ethyl ketone
(Material No.CP1041)	Isopropyl alcohol
(Material No.CP2721)	abrasive cloth, silicon carbide
(Material No.14SBA1)	Textile-Lint free Cotton -
No specific	S1096 aluminum alloys etchant

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 703211
SPM 703212
SPM 703221
SPM 703222
SPM 704111
SPM 704112
SPM 705311
SPM 706214
Flow Path Panels - Blending Area
Flow Path Panels - Blending Limits

3. Job Set-up
Subtask 72-24-09-941-053-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 72-24-09-010-056-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 72-24-09-040-053-A

C. Deactivation of the Thrust Reverser (T/R) 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 T/R system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-09-010-057-A

D. Get Access
(1) Open the T/R 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 72-24-09-220-050-A

A. Dimensional Information

Flow Path Panels - Blending Area

Flow Path Panels - Blending Limits

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

Description	Minimum In-Process Dimension	Maximum In-Process Dimension	Minimum Finish Dimension	Maximum Finish Dimension	Reference Dimension
Dia A	-	-	60 mm (2.36 in.)	-	-
Dim B	-	-	1.8 mm (0.071 in.)	-	-
Dim X	-	-	40xP	-	-
Dim Y	-	-	40xP	-	-
SURFACE R1*	-	-	-	42 cm2 (6.5 in.2)	-
SURFACE R2*	-	-	-	100 cm2 (15.5 in.2)	-
SURFACE R3*	-	-	-	100 cm2 (15.5 in.2)	-
SURFACE R4*	-	-	-	45 cm2 (7 in.2)	-
* Total surface of OAS touch-up with alodine for each flow path panel. R1 for flow path panel 1 R2 for flow path panel 2 R3 for flow path panel 3 R4 for flow path panel 4

Subtask 72-24-09-110-050-A

B. Clean the Part to be Repaired

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

(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 72-24-09-200-050-A

C. Inspect the Part to be Repaired
(1) For each panel, measure the total surface of the areas repaired before.
(a) Make sure that after the repair, the total surface will still be in the limits. Refer to paragraph 4.A. ”Dimensional Information”.
(2) If you need to blend, refer to paragraph 4.D. ”Blend the Areas to be Repaired”.
(3) If you need to do the spot touch-up, refer to paragraph 4.F. ”Spot Touch-up of Area to be Repaired on Aluminum Alloy Parts”.

Subtask 72-24-09-320-050-A

D. Blend the Areas to be Repaired as Follows SPM 704112 or SPM 704111

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

CAUTION: WHEN YOU DO THE BLENDING, REMOVE ONLY THE MINIMUM QUANTITY OF MATERIAL NECESSARY TO REMOVE THE DEFECT. IF YOU REMOVE TOO MUCH MATERIAL, DAMAGE TO THE PART CAN OCCUR.

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

CAUTION: YOU MUST OBEY THE LIMITS APPLICABLE TO: - THE AREA THAT YOU BLEND, AND - THE TOTAL SURFACE OF THE AREA THAT YOU TOUCH UP. IF YOU DO NOT OBEY THESE LIMITS, DAMAGE TO THE PART WILL 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.

(1)

Flow Path Panels - Blending Area

Flow Path Panels - Blending Limits

(2) Make sure that total surface to be touched-up will still be in the limit. Refer to Para 4.A. ”Dimensional Information”.

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.

(3) Blow the blended surfaces with AIR SOURCE FILTERED, DRY and oil-free.
(4) Do a Fluorescent Penetrant Inspection (FPI). Refer to Para 4.E. ”Do the FPI of the Blended Areas”.

Subtask 72-24-09-230-050-A

E. Do the FPI of the Blended Areas as Follows
(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 etched 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. Refer to Para 4.F. ”Spot Touch-up of Area to be Repaired on Aluminum Alloy Parts”.

Subtask 72-24-09-380-050-A

F. Spot Touch-up of Area to be Repaired on Aluminum Alloy Parts

CAUTION: YOU MUST OBEY THE LIMITS APPLICABLE TO THE TOTAL SURFACE OF THE AREA THAT YOU TOUCH UP. IF YOU DO NOT OBEY THESE LIMITS, DAMAGE TO THE PART WILL OCCUR.

(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 CP2721abrasive cloth, silicon carbide, grade 400 minimum SPM 704111.
(a)

Flow Path Panels - Blending Area

(b) Make sure that total surface is in the limit. Refer to Para 4.A. ”Dimensional Information”.

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.

(3) Blow the repaired surfaces with AIR SOURCE FILTERED, DRY and de-oiled.
(4) 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) .
(5) Do the spot touch-up of the sulfuric anodizing and check the protective coating SPM 706214.

5. Close-up
Subtask 72-24-09-410-054-A

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the T/R 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 72-24-09-440-052-A

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

Subtask 72-24-09-410-055-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 02:53:09 UTC