Blend Repair of the Flow Splitter [CFML]

TASK 72-21-00-300-802-A
Blend Repair of the Flow Splitter

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: 400

1. Reason for the Job
Self explanatory
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	1	MAT - PROTECTIVE
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2721)	CS 333 X

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS

D. Referenced Information

REFERENCE	DESIGNATION
TASK 72-21-20-000-801-A	Removal of the Fan Blades
TASK 72-21-20-400-801-A	Installation of the Fan Blades
SPM 703224
SPM 704100
Blend Repair of the Flow Splitter

3. Job Set-up
Subtask 72-21-00-941-100-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, and
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).
(3) Put the ACCESS PLATFORM 1M(3 FT) in position.
(4) Install the MAT - PROTECTIVE in the lower half of the inlet cowl.

Subtask 72-21-00-010-075-A

B. Get Access
(1) Remove the fan rotor blades (Ref. AMM TASK 72-21-20-000-801).

NOTE: Make sure that you number each blade while you remove it. This will help to make sure that each blade is installed in its initial position.

4. Procedure

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.

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

Subtask 72-21-00-220-059-A

A. Do a check for dimensions and location of defects on area G:

Blend Repair of the Flow Splitter

(1) Make sure you compare the dimensions and location of defects on the area G with repair limits.

Table 1 - Dimensional Limits

DESCRIPTION	MINIMUM IN-PROCESS DIMENSION	MAXIMUM IN-PROCESS DIMENSION	MINIMUM FINISH DIMENSION	MAXIMUM FINISH DIMENSION	REFERENCE DIMENSION
1.Zoning
Dimension F	-	-	-	-	71 mm (2.80 in.)
Dimension K	-	-	-	-	10 mm (0.39 in.)
2.Blending limits (area G)
Dimension E	-	-	-	0.35 mm (0.0138 in.)	-
Dimension X	-	-	Dimension E multiplied by ten (Dim. E x 10)	-	-
Radius R	-	-	Dimension E multiplied by two (Dim. E x 2)	-	-

(2) If the damage or repair area is more than the limits, the part is not repairable.

Subtask 72-21-00-320-055-A

B. Blend Repair of the Flow Splitter

CAUTION: USE ONLY SILICON CARBIDE TYPE WHEELS, STONES OR ABRASIVE PAPERS FOR THIS REPAIR.

CAUTION: DO NOT BLEND AREA H. IF YOU DO, DAMAGE TO AREA H WILL OCCUR.

(1) Do the blending with a file-smooth or strips of CS 333 X (Material No.CP2721) SPM 704100.
(a) Remove a minimum of 0.025 mm (0.0010 in.) of base metal in addition to depth of the defect but do not blend more than the permitted limits (do not exceed dimension E).

NOTE: Make sure that you do not blend more than the permitted limits (do not exceed dimension E).

(b) The minimum distance between two blend repairs must be more than two times the most important dimension X of the two repairs.

Subtask 72-21-00-230-054-A

C. Penetrant Inspection of the Reworked Area
(1) Do a medium sensitivity, level 2, fluorescent-penetrant inspection of the reworked area SPM 703224.
(a) Make sure that there are no cracks.

5. Close-up
Subtask 72-21-00-410-077-A

A. Close Access
(1) Install the fan rotor blades (Ref. AMM TASK 72-21-20-400-801).

Subtask 72-21-00-410-078-A

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the MAT - PROTECTIVE from the lower half of the inlet cowl.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:51:22 UTC