Right Hand (RH) and Left Hand (LH) Strut 5 Fairings - Blending [CFML]

TASK 72-24-03-300-806-A
Right Hand (RH) and Left Hand (LH) Strut 5 Fairings - Blending

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 the RH and LH strut 5 fairings.
Ref Fig N_MP_722403_991_04100—RH and LH Strut 5 Fairings.
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	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP1041)	isopropyl alcohol
No specific	S1093 Titanium 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 72-24-03-210-802-A	Visual Inspection of the Strut 5
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 702123
SPM 703200
SPM 704111
SPM 704112
SPM 705311
RH and LH Strut 5 Fairings

3. Job Set-up
Subtask 72-24-03-941-066-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 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 a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 72-24-03-010-081-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 72-24-03-040-066-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 72-24-03-010-082-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.

Subtask 72-24-03-990-051-A

E. Applicable Parts
(1) The subsequent table gives a list of the part numbers that are applicable to this repair. All part numbers are applicable to all paragraphs unless specified differently.

Part Number	Service Bulletin	CSN	Designation
362-033-155-0	-	(18-170; 72-00-00)	RH strut 5 fairing
362-033-255-0	-	(18-120; 72-00-00)	LH strut 5 fairing

Table - Applicable Parts

4. Procedure
Subtask 72-24-03-220-058-A

A. Dimensional Information

Description	Minimum In-Process Dimension	Maximum In-Process Dimension	Minimum Finish Dimension	Maximum Finish Dimension	Reference Dimension
DIM. A	-	-	52 mm (2.05 in.)	-	-
DIM. B	-	-	28 mm (1.10 in.)	-	-
DIA C	-	-	26 mm (1.02 in.)	-	-
DIM. D	-	-	58 mm (2.28 in.)	-	-
DIM. E	-	-	63 mm (2.48 in.)	-	-
DIM. F	-	-	64 mm (2.52 in.)	-	-
DIA G	-	-	26 mm (1.02 in.)	-	-
DIM. H	-	-	50 mm (1.97 in.)	-	-
DIM. J	-	-	28 mm (1.10 in.)	-	-
DIM. K	-	-	60 mm (2.36 in.)	-	-
DIM. L	-	-	73 mm (2.87 in.)	-	-
DIM. M	-	-	72 mm (2.83 in.)	-	-
DIM. N	-	-	-	0.6 mm (0.02 in.)	-

Table - Dimensional Information

Subtask 72-24-03-210-054-A

B. Visual Inspection of the Strut 5 Fairing
(1) Do a visual inspection of the strut 5 fairing. Maximum three blending are permitted.

Subtask 72-24-03-320-050-A

C. Do a blend of the strut 5 fairing.

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

WARNING: DO NOT LET TITANIUM DUST COLLECT. TITANIUM DUST IS FLAMMABLE. DO NOT USE WATER TO EXTINGUISH A TITANIUM FIRE. EXTINGUISH WITH AN APPROVED CHEMICAL FOR METAL FIRES.

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: DO NOT BLEND TITANIUM PARTS WITH TOOLS (SUCH AS GRINDING WHEELS, FILES, STONES OR ABRASIVE CLOTH) USED TO REPAIR OTHER MATERIALS.

(1) Alternative procedure available. Remove the indication by hand blending. SPM 704111 to Para 4.A. ”Dimensional Information”:
(a) The blended area must make a smooth contour into the adjacent areas to keep correct airflow.

CAUTION: WHEN YOU DO THE POWER BLENDING, MAKE SURE THAT THE BLADE DOES NOT BECOME TOO HOT, WHICH WILL CAUSE THERMAL STRESS. THERMAL STRESS CAN CAUSE ENGINE FAILURE.

(2) Alternative procedure. Remove the indication by power blending. SPM 704112 to Para 4.A. ”Dimensional Information”:
(a) The blended area must make a smooth contour into the adjacent areas to keep correct airflow.
(3) If the minimum acceptable distance between two repaired areas is less than 40 times the DIM. N, mix them to get only one repaired area.

Subtask 72-24-03-110-051-A

D. Clean the blended areas.
(1) Clean the blended areas using isopropyl alcohol (Material No.CP1041) SPM 702123.

Subtask 72-24-03-110-054-A

E. Local Swab Etching of the Repaired Areas
(1) Do a local swab etching of the repaired areas with S1093 Titanium Alloys Etchant SPM 705311.

Subtask 72-24-03-230-053-A

F. Do a fluorescent penetrant inspection on the repaired areas SPM 703200 as follows:
(1) Use sensitivity level 2.
(2) Standard unit surface: 25 mm (0.98 in.) x 25 mm (0.98 in.) inspection field.
(3) Indications less than 0.30 mm (0.0118 in.) are not to be taken into account.
(4) Indications greater than 1.5 mm (0.059 in.) are not permitted.
(5) Dimension of the satisfactory indications to count: from 1.0 mm (0.039 in.) to 1.5 mm (0.059 in.). Maximum number of satisfactory indications to count: 10.
(6) Minimum spacing between two indications should be greater than or equal to three times the size of the largest indication. Otherwise, they are considered as forming only one indication. If there are more than two aligned indications, to determine the spacing, take the largest real dimension of the indications bounding this interval.
(7) The minimum spacing between 2 H level clusters must be greater than or equal to 20 mm (0.79 in.).

Subtask 72-24-03-210-055-A

G. Do a visual inspection of the strut 5 fairing (Ref. AMM TASK 72-24-03-210-802).

5. Close-up
Subtask 72-24-03-410-077-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 72-24-03-440-064-A

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

Subtask 72-24-03-410-078-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 02:52:49 UTC