Detailed Inspection of Extrados Strut Seal, Intrados Strut Seal, Seal with Vgroove [CFML]

TASK 72-24-03-220-801-A
Detailed Inspection of Extrados Strut Seal, Intrados Strut Seal, Seal with Vgroove

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
Refer to the MPD TASK: 722000-L4
DETAILED INSPECTION OF EXTRADOS STRUT SEAL, INTRADOS STRUT SEAL, SEAL WITH VGROOVE.

This procedure gives the visual inspection criteria for extrados and intrados strut 1 seals.

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

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 72-24-03-000-801-A	Removal of the Strut 1
TASK 72-24-03-400-801-A	Installation of the Strut 1
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
Visual Examination of Extrados and Intrados Strut 1 Seals

3. Job Set-up
Subtask 72-24-03-941-058-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 72-24-03-010-065-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 72-24-03-040-058-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 72-24-03-010-066-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
(2) Remove the strut 1 (Ref. AMM TASK 72-24-03-000-801).

4. Procedure
Subtask 72-24-03-220-050-A

A. Visual Inspection of the Extrados Strut 1 Seal (1) and the Intrados Strut 1 Seal (2)

INSPECT/CHECK	MAXIMUM SERVICEABLE LIMITS	REMARKS
1.Visual examination of the seal profile area (area B) of the extrados strut 1 seal (1)
A.Wear, textile delamination	Not serviceable
B.Break, crack, scratch	Not serviceable
C.Color change	Not serviceable
D.Bubbles	Not serviceable
E.Permanent strain, excessive strain	Not serviceable
2.Visual examination of the seal rubber pins (5) of the extrados strut 1 seal (1)
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Breaks	Not serviceable
3.Visual examination of the seal ventilation holes (3) of the extrados strut 1 seal (1)
A.Missing	Not serviceable
B.Filled	Serviceable after cleaning.
4.Visual examination of the seal junction (4) of the extrados strut 1 seal (1)
A.RTV (Room Temperature Vulcanization) glue missing	Not serviceable
B.Gap	Not serviceable
C.Wear	Not serviceable
D.Break, crack, scratch	Not serviceable
E.Color change	Not serviceable
5.Visual examination of the metallic plate (area C) of the extrados strut 1 seal (1)
A.Fretting, erosion, wear	Not serviceable
B.Nicks, scratches, cracks	Not serviceable
C.Dents	Not serviceable
6.Visual examination of the seal profile area (area B) of the intrados strut 1 seal (2)
A.Wear, textile delamination	Not serviceable
B.Break, crack, scratch	Not serviceable
C.Color change	Not serviceable
D.Bubbles	Not serviceable
E.Permanent strain, excessive strain	Not serviceable
7.Visual examination of the seal rubber pins (5) of the intrados strut 1 seal (2)
A.Missing	Not serviceable
B.Looseness	Not serviceable
C.Breaks	Not serviceable
8.Visual examination of the ventilation holes (3) of the intrados strut 1 seal (2)
A.Missing	Not serviceable
B.Filled	Serviceable after cleaning.
9.Visual examination of the seal junction (4) of the intrados strut 1 seal (2)
A.RTV glue missing	Not serviceable
B.Gap	Not serviceable
C.Wear	Not serviceable
D.Break, crack, scratch, color change	Not serviceable
10.Visual examination of the metallic plate (area C) of the intrados strut 1 seal (2)
A.Fretting, erosion, wear	Not serviceable
B.Nicks, scratches, cracks	Not serviceable
C.Dents	Not serviceable

5. Close-up
Subtask 72-24-03-410-063-A

A. Close Access
(1) Install the strut 1 (Ref. AMM TASK 72-24-03-400-801).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) 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 72-24-03-440-057-A

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

Subtask 72-24-03-410-064-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 02:52:48 UTC