Detailed Inspection of the CAF 4 Sealant in Pylon Cantilever Zone A

TASK 54-50-00-220-001-A
Detailed Inspection of the CAF 4 Sealant in 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: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

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.

ZONE: 410
ZONE: 420

1. Reason for the Job
Refer to the MPD TASK: 545000-06
DETAILED INSPECTION OF THE CAF 4 SEALANT IN 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	FLASHLIGHT
No specific	AR	MIRROR - INSPECTION, FLEXIBLE
No specific	AR	WARNING NOTICE(S)

B. 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, 413CL, 423AL, 423CL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 54-52-00-300-001-A	Repair of the CAF4 Sealant in the Pylon Cantilever Zone "A"
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
CAF 4 Sealant - Pylon Cantilever

3. Job Set-up
Subtask 54-50-00-941-058-A ** ON A/C NOT FOR ALL

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

Subtask 54-50-00-040-053-A ** ON A/C NOT FOR ALL

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

Subtask 54-50-00-040-053-B ** ON A/C NOT FOR ALL

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

Subtask 54-50-00-010-055-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 54-50-00-220-050-A ** ON A/C NOT FOR ALL

A. Inspection of the CAF 4 Sealant in Pylon Cantilever Zone A

CAF 4 Sealant - Pylon Cantilever ** ON A/C NOT FOR ALL

(1) Do a detailed visual inspection of the bottom surface of pylon cantilever zone A with the FLASHLIGHT and the MIRROR - INSPECTION, FLEXIBLE.
(2) Make sure that kerosene or hydraulic fluid does not cause contamination of the CAF 4 sealant:
(a) If the volume of the sealant increased and the sealant breaks easily, there is kerosene contamination.
(b) If the volume of the sealant did not change but its color became yellow, there is hydraulic fluid contamination.
(3) If you find contamination, repair the CAF 4 sealant (Ref. AMM TASK 54-52-00-300-001).

5. Close-up
Subtask 54-50-00-440-053-A ** ON A/C NOT FOR ALL

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

Subtask 54-50-00-440-053-B ** ON A/C NOT FOR ALL

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

Subtask 54-50-00-410-054-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 and 413CL
(b) For the right pylon: 423AL and 423CL.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:59:06 UTC