Visual Inspection of Flow Path Panels 1 to 4 [CFML]

TASK 72-24-09-210-801-A
Visual Inspection of Flow Path Panels 1 to 4

ZONE: 400

1. Reason for the Job
This procedure gives the criteria for the visual inspection of flow path panels 1 to 4.

NOTE: The inspection criteria below are applicable after the removal of the high metal.

NOTE: You can use equivalent alternatives for standard tools, equipment and consumable materials.

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	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
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

C. 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 72-24-09-320-801-A	Kit Engine - Flow Path Panels 1 to 4 - Blending and Spot Touch-up
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
Flow Path Panel 1
Flow Path Panel 2
Flow Path Panel 3
Flow Path Panel 4

3. Job Set-up
Subtask 72-24-09-941-052-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 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).

Subtask 72-24-09-010-054-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 1M(3 FT) in position.

Subtask 72-24-09-040-052-A

C. Deactivation of the Thrust Reverser System for Maintenance

WARNING: MAKE THE THRUST REVERSER UNSERVICEABLE (INSTALL AND SAFETY THE ICU LOCKOUT PIN) BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT INSTALL AND SAFETY THE ICU LOCKOUT PIN, YOU CAN CAUSE ACCIDENTAL OPERATION OF THE THRUST REVERSER AND INJURY TO PERSONS AND/OR DAMAGE TO THE EQUIPMENT.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-09-010-055-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
Subtask 72-24-09-420-054-A

A. Visual Inspection of Flow Path Panels 1 to 4

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual inspection of all the areas of flow path panel 1 (1):
A.Fretting, erosion, wear	Permitted if parent material not visible	See repair (Ref. AMM TASK 72-24-09-320-801).
B.Missing OAS	Permitted if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-09-320-801).
C.Dents	Permitted if not more than 0.019 in. (0.48 mm) in depth. Minimum space between two defects must be five times the size of the defect	See repair (Ref. AMM TASK 72-24-09-320-801).
D.Nicks, scratches, cracks	Not serviceable	See repair (Ref. AMM TASK 72-24-09-320-801).
2.Visual inspection of all the areas of flow path panel 2 (2):
A.Fretting, erosion, wear	Permitted if parent material not visible	See repair (Ref. AMM TASK 72-24-09-320-801).
B.Missing OAS	Permitted if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-09-320-801).
C.Dents or nicks	Permitted if not more than 0.019 in. (0.48 mm) in depth. Minimum space between two defects must be five times the size of the defect	See repair (Ref. AMM TASK 72-24-09-320-801).
D.Scratches or cracks	Permitted if not more than 1 in. (25.4 mm) in length	See repair (Ref. AMM TASK 72-24-09-320-801).
3.Visual inspection of all the areas of flow path panel 3 (3):
A.Fretting, erosion, wear	Permitted if parent material not visible	See repair (Ref. AMM TASK 72-24-09-320-801).
B.Missing OAS	Permitted if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-09-320-801).
C.Dents or nicks	Permitted if not more than 0.019 in. (0.48 mm) in depth. Minimum space between two defects must be five times the size of the defect	See repair (Ref. AMM TASK 72-24-09-320-801).
D.Scratches or cracks	Permitted if not more than 1 in. (25.4 mm) in length	See repair (Ref. AMM TASK 72-24-09-320-801).
4.Visual inspection of all the areas of flow path panel 4 (4):
A.Fretting, erosion, wear	Permitted if parent material not visible	See repair (Ref. AMM TASK 72-24-09-320-801).
B.Missing OAS	Permitted if no corrosion (white foam)	See repair (Ref. AMM TASK 72-24-09-320-801).
C.Dents	Permitted if not more than 0.019 in. (0.48 mm) in depth. Minimum space between two defects must be five times the size of the defect	See repair (Ref. AMM TASK 72-24-09-320-801).
D.Nicks, scratches, cracks	Not serviceable	See repair (Ref. AMM TASK 72-24-09-320-801).

5. Close-up
Subtask 72-24-09-410-052-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 72-24-09-440-051-A

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 72-24-09-410-053-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 02:53:07 UTC