Visual Inspection of the Junction Shroud Fitting [CFML]

TASK 72-24-06-210-801-A
Visual Inspection of the Junction Shroud Fitting

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.

1. Reason for the Job
This procedure gives the criteria for the visual inspection of the junction shroud fitting.

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
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 72-24-06-000-801-A	Removal of the Shroud Junction Fitting
TASK 72-24-06-400-801-A	Installation of the Shroud Junction Fitting
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
The Axial Junction Shroud Fitting - PRE SB72-0232
The Axial Junction Shroud Fitting - POST SB72-0232
The Junction Shroud Fitting
The Axial Junction Shroud Fitting - PRE SB72-0232
The Axial Junction Shroud Fitting - POST SB72-0232
The Junction Shroud Fitting

3. Job Set-up
Subtask 72-24-06-941-052-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 72-24-06-010-054-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 72-24-06-040-052-A

C. Deactivation of the Thrust Reverser 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 thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 72-24-06-010-055-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 72-24-06-420-051-A

A. Visual Inspection of the Junction Shroud Fitting on the Exposed Area

The Axial Junction Shroud Fitting - PRE SB72-0232

The Axial Junction Shroud Fitting - POST SB72-0232

The Junction Shroud Fitting

The Axial Junction Shroud Fitting - PRE SB72-0232

The Axial Junction Shroud Fitting - POST SB72-0232

The Junction Shroud Fitting

(1) Do a visual inspection of all the areas of the axial junction shroud fitting. Refer to the table below for the inspection area.

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1. Visual inspection of all the areas of the axial junction shroud fitting (1)
A. Fretting, erosion, wear	PRE SB72-0232 - Any amount, if dimension C is between 0.193 in. (4.9 mm) and 0.201 in. (5.1 mm). - Any amount, if dimension D is between 0.193 in. (4.9 mm) and 0.201 in. (5.1 mm). END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232	Replace the axial junction shroud fitting (1) (Ref. AMM TASK 72-24-06-000-801) and (Ref. AMM TASK 72-24-06-400-801).
2. Visual inspection of area D (all areas except area E)
A. Dents	PRE SB72-0232 Permitted, if not more than 0.023 in. (0.6 mm) in depth. END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232
3. Visual inspection of area E
A. Dents	Not serviceable	Replace the axial junction shroud fitting (1) (Ref. AMM TASK 72-24-06-000-801) and (Ref. AMM TASK 72-24-06-400-801).
4. Visual inspection of area F (all areas except area G)
A. Nicks, scratches, cracks	Not serviceable	Replace the axial junction shroud fitting (1) (Ref. AMM TASK 72-24-06-000-801) and (Ref. AMM TASK 72-24-06-400-801).
5. Visual inspection of area G
A. Nicks, scratches, cracks	PRE SB72-0232 Permitted, if not more than 0.023 in. (0.6 mm) in depth. END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232
6. Visual inspection of the replaceable nuts (2)
A. Missing	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
B. Looseness	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
C. Damage	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
7. Visual inspection of the seal (3)
A. Missing	Not serviceable
B. Looseness	Not serviceable
C. Break, crack, scratch, color change	Not serviceable
D. Bubbles	Not serviceable
E. Permanent strain, excessive strain	Not serviceable
8. Visual inspection of all the areas of the junction shroud fitting (4)
A. Fretting, galling, erosion, wear	PRE SB72-0232 Any amount, if dimension E is between 0.193 in. (4.9 mm) and 0.201 in. (5.1 mm). END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232
9. Visual inspection of area H (all the areas except area J)
A. Dents	PRE SB72-0232 Permitted, if not more than 0.023 in. (0.6 mm) in depth. END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232
10. Visual inspection of area J
A. Dents	Not serviceable	Replace the junction shroud fitting (4) (Ref. AMM TASK 72-24-06-000-801) and (Ref. AMM TASK 72-24-06-400-801).
11. Visual inspection of area K
A. Nicks, scratches, cracks	Not serviceable	Replace the junction shroud fitting (4) (Ref. AMM TASK 72-24-06-000-801) and (Ref. AMM TASK 72-24-06-400-801).
12. Visual inspection of area L
A. Nicks, scratches, cracks	PRE SB72-0232 Permitted, if not more than 0.023 in. (0.6 mm) in depth. END PRE SB72-0232 POST SB72-0232 Not serviceable END POST SB72-0232
13. Visual inspection of the replaceable nuts (5)
A. Missing	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
B. Looseness	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
C. Damage	Not serviceable	PRE SB72-0232 See repair (Ref. AMM D/O 72-24-06-96). END PRE SB72-0232
14. Visual inspection of the seal (6)
A. Missing	Not serviceable
B. Looseness	Not serviceable
C. Break, crack, scratch, color change	Not serviceable
D. Bubbles	Not serviceable
E. Permanent strain, excessive strain	Not serviceable

5. Close-up
Subtask 72-24-06-410-052-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 72-24-06-440-051-A

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

Subtask 72-24-06-410-053-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 13:04:02 UTC