Repair of the CAF4 Sealant in the Pylon Cantilever Zone "A"

TASK 54-52-00-300-001-A
Repair of the CAF4 Sealant in the Pylon Cantilever Zone "A"

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 410
ZONE: 420

1. Reason for the Job
To repair the sealant that has contamination by kerozene or skydrol in the pylon cantilever zone "A".
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.06CMD9)	Silicone Adhesive Sealant-General Purpose One part legacy
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.08BBC1)	Non Aqueous Cleaner-- Naphta based and Alcohol -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
413AL, 423AL

D. Referenced Information

REFERENCE	DESIGNATION
TASK 54-52-11-000-002-A	Removal of the Access Panels
TASK 54-52-11-000-002-B	Removal of the Access Panels
TASK 54-52-11-400-002-A	Installation of the Access Panels
TASK 54-52-11-400-002-B	Installation of the Access Panels
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
CAF4 Sealant - Pylon Cantilever

3. Job Set-up
Subtask 54-52-00-941-052-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On overhead maintenance panel 50VU:
(a) Make sure that the ON legend of ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize FADEC 1(2).

Subtask 54-52-00-040-051-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 54-52-00-040-051-B ** ON A/C NOT FOR ALL

B. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-040-012).

Subtask 54-52-00-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position:
(a) For the left pylon, in zone 410
(b) For the right pylon, in zone 420.
(2) Remove the access panels (Ref. AMM TASK 54-52-11-000-002):
(a) For the left pylon: 413AL
(b) For the right pylon: 423AL.

4. Procedure
Subtask 54-52-00-350-050-A ** ON A/C NOT FOR ALL

A. Repair of the CAF4 Sealant

CAF4 Sealant - Pylon Cantilever ** ON A/C NOT FOR ALL

(1) Before you do the repair of the CAF4 sealant:

do a check for leaks of the sealant in the area that has contamination and in the adjacent area.

(2) If you find leaks, do a repair of the CAF4 sealant.
(3) Repair of the CAF4 sealant.
(a) In the areas where you can easily get access:
1 Use a scraper to remove the old sealant that has contamination plus 10 mm (0.3937 in.) all around the area.
2 Clean with Non Aqueous Cleaner-- Naphta based and Alcohol - (Material No.08BBC1) .
3 Remove the grease with Non Aqueous Cleaner-General - - (Material No.08BAA9) .

NOTE: If there is contamination by kerozene, after you have removed the sealant, clean the area with Non Aqueous Cleaner-General - - (Material No.08BAA9) .

(b) In the areas where you cannot easily get access:
1 Clean the sealant with Non Aqueous Cleaner-- Naphta based and Alcohol - (Material No.08BBC1) .
2 Remove the grease with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(c) Apply Silicone Adhesive Sealant-General Purpose One part legacy (Material No.06CMD9) on the repair areas.

NOTE: To do this, refer to the supplier technical data-sheet.

5. Close-up
Subtask 54-52-00-440-051-A ** ON A/C NOT FOR ALL

A. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 54-52-00-440-051-B ** ON A/C NOT FOR ALL

A. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-440-012).

Subtask 54-52-00-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the access panels (Ref. AMM TASK 54-52-11-400-002):
(a) For the left pylon: 413AL
(b) For the right pylon: 423AL.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:49:32 UTC