FINCH painting of the IGGS Dual-Flapper Check Valve

TASK 47-20-43-370-001-A
FINCH painting 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	PAPER - MASKING
No specific	AR	TAPE - MASKING
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 - Masking Area

3. Job Set-up
Subtask 47-20-43-861-050-A ** ON A/C NOT FOR ALL

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

Subtask 47-20-43-010-055-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 47-20-43-370-051-A ** ON A/C NOT FOR ALL

A. Painting procedure

IGGS Dual-Flapper Check Valve - Masking Area ** ON A/C NOT FOR ALL

(1) Put PAPER - MASKING and TAPE - MASKING on:
(a) The two labels,
(b) The bonding attachment points,
(c) The bonding leads,
(d) The IGGS Dual-Flapper Check Valve connector.
(2) Carefully sand the damaged paint and primer coatings with CLOTH-EMERY (GRADE 320) on the tank at the IGGS Dual-Flapper Check Valve installation area and around the IGGS Dual-Flapper Check Valve.

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

(3) 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.

(4) Apply FINCH painting on the IGGS Dual-Flapper Check Valve SRM 517512 (9. Renewal of damaged fuel tank top coating on center tank and horizontal stabilizer center tank).

5. Close-up
Subtask 47-20-43-860-055-A ** ON A/C NOT FOR ALL

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

Subtask 47-20-43-410-054-A ** ON A/C NOT FOR ALL

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

Subtask 47-20-43-862-050-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