FINCH painting after re-installation of the IGGS Dual-Flapper Check Valve

TASK 47-20-43-370-002-A
FINCH painting after re-installation of the IGGS Dual-Flapper Check Valve

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: THIS PROCEDURE USES A FUEL SYSTEM ITEM THAT IS IN A CATEGORY KNOWN AS A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL). CDCCL IDENTIFIES AN ITEM THAT CAN BE THE SOURCE OF A POSSIBLE FUEL TANK IGNITION. YOU MUST KEEP ALL CDCCL ITEMS IN THE APPROVED CONFIGURATION. DAMAGE, WEAR OR CHANGES TO A CDCCL ITEM CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

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

1. Reason for the Job
Apply the double barrier protection on the IGGS Dual-Flapper Check Valve in order to achieve a waterproof barrier to fuel vapours.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	CLOTH-EMERY (GRADE 320)
No specific	AR	VACUUM CLEANER

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
241EF

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 53-32-12-000-002-A	Removal of the Cabin Floor Panels
TASK 53-32-12-400-002-A	Installation of the Cabin Floor Panels
SRM 517512
IGGS Dual-Flapper Check Valve - Painting Repair

3. Job Set-up
Subtask 47-20-43-861-051-A ** ON A/C NOT FOR ALL

A. Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).

Subtask 47-20-43-010-056-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Remove the cabin floor panel 241EF to get access to the top of the center tank (Ref. AMM TASK 53-32-12-000-002).

4. Procedure
Subtask 47-20-43-370-052-A ** ON A/C NOT FOR ALL

A. Painting procedure

IGGS Dual-Flapper Check Valve - Painting Repair ** ON A/C NOT FOR ALL

(1) Carefully sand the damaged paint and primer coatings with CLOTH-EMERY (GRADE 320) around the IGGS Dual-Flapper Check Valve.

NOTE: Make sure that the surface is smooth and flat.

(2) Clean the prepared and adjacent areas with a VACUUM CLEANER to remove particles of dust and dirt.

WARNING: THIS INSTRUCTION IS APPLICABLE TO A CRITICAL DESIGN CONFIGURATION CONTROL LIMITATION (CDCCL) ITEM. CAREFULLY OBEY ALL GIVEN INSTRUCTIONS WHEN YOU DO THIS STEP. IF YOU DO NOT OBEY THESE INSTRUCTIONS, A DANGEROUS CONDITION CAN OCCUR THAT CAN CAUSE A POSSIBLE FUEL TANK EXPLOSION.

(3) Apply FINCH painting on the prepared area SRM 517512 (9. Renewal of damaged fuel tank top coating on center tank and horizontal stabilizer center tank).

5. Close-up
Subtask 47-20-43-860-056-A ** ON A/C NOT FOR ALL

A. Make sure that the work area is clean and clear of tools and other items.

Subtask 47-20-43-410-055-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Install the cabin floor panel 241EF (Ref. AMM TASK 53-32-12-400-002).

Subtask 47-20-43-862-051-A ** ON A/C NOT FOR ALL

C. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.04.02 07:20:22 UTC