Blend Repair of the Platform Front Shroud [CFML]

TASK 72-21-60-300-801-A
Blend Repair of the Platform Front Shroud

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 procedure give instructions to do the blend repair of the platform front shroud.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ABRASIVE STONE
No specific	1	FILE - FINE
No specific	1	MACHINE - GRINDING
No specific	1	POWER TOOL
No specific	AR	WARNING NOTICE(S)
98N7160H003-000	1	INLET PROTECTIVE RUG

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
(Material No.CP2721)	abrasive cloth, silicon carbide

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

D. Referenced Information

REFERENCE	DESIGNATION
SPM 702111
SPM 703214
SPM 704111
SPM 704112
SPM 705311
Blend Repair of the Platform Front Shroud Flowpath

3. Job Set-up
Subtask 72-21-60-941-053-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 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).
(3) Install the 98N7160H003-000 INLET PROTECTIVE RUG.
(4) Remove the platform shroud.

4. Procedure
Subtask 72-21-60-220-050-A

A. Table 801 - Dimensional Information

Description	Minimum In-Process Dimension	Maximum In-Process Dimension	Minimum Finish Dimension	Maximum Finish Dimension	Reference Dimension
Dim D	-	-	-	0.0098 in. (0.25 mm)	-
Dim L	-	-	-	-	2 x W
Dim R	-	-	0.79 in. (20.07 mm)	-	-

Subtask 72-21-60-350-050-A

B. Blend Repair of the Platform Front Shroud

CAUTION: YOU MUST REMOVE ONLY A MINIMUM AMOUNT OF METAL IN ADDITION TO THE DEPTH OF INDICATION. THE BLENDED AREA MUST MAKE A SMOOTH TRANSITION INTO THE ADJACENT AREAS.

(1) Remove the local indication by blending as follows. Refer to Para. 4.A for dimensional information.

Blend Repair of the Platform Front Shroud Flowpath

(a) The minimum distance between two blend repairs must be more than 1.97 in. (50.04 mm).
(b) The number of blend repairs must be less than or equal to ten.
(c) Remove the local indication by blending as follows. Alternative procedure available. See Sheet 1 of the figure.

Blend Repair of the Platform Front Shroud Flowpath

1 Remove the defects with a FILE - FINE or ABRASIVE STONE, grade 150 or grade 180 SPM 704111.
(d) Remove the local indication by blending as follows. Alternative procedure. See Sheet 1 of the figure.

Blend Repair of the Platform Front Shroud Flowpath

1 If required, you can use a low-speed POWER TOOL, equipped with a MACHINE - GRINDING to shorten the time required to remove metal, but you must do a hand finishing as below SPM 704112.
(2) Polish with strips of CP2721abrasive cloth, silicon carbide to get a clean and smooth surface finish of 0.000126 in. (0.0032 mm) SPM 704111.
(3) Do a check of the surface finish of the part. The surface finish (roughness) must be not more than 0.000126 in. (0.0032 mm) in the repair area. If the surface finish does not agree with this condition, polish again the blend area.
(4) Clean the repair area with isopropyl alcohol (Material No.CP1041) SPM 702111.
(5) Locally etch all the blended areas SPM 705311.
(6) Do a S3 fluorescent-penetrant inspection. Cracks are not permitted SPM 703214.

5. Close-up
Subtask 72-21-60-942-052-A

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the platform shroud.
(3) Remove the 98N7160H003-000 INLET PROTECTIVE RUG.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:52:09 UTC