Installation of the Water Drain Valve

TASK 28-11-41-400-004-A
Installation of the Water Drain Valve

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: MAKE SURE THAT THE FLIGHT CONTROL SAFETY-LOCKS AND THE WARNING NOTICES ARE IN POSITION.

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

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

ZONE: 540
ZONE: 640
FIN: 25QM
FIN: 26QM

1. Reason for the Job
Self Explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 3M (10 FT)
No specific	1	ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE
No specific	AR	SAFETY BARRIER(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.01ABA1)	Turbine Fuel-- Kerosene -
(Material No.03FAB1)	Mineral Oil base Grease-- Vaseline or Petrolatum -
(Material No.06HAA1)	Coating Sealant-Fuel Tank Brushable -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
540	FUEL TANK
640	FUEL TANK
540AB, 540BZ, 640AB, 640BZ

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	O-RING	AIPC 28-11-05-21-090
7	O-RING	AIPC 28-11-05-21-130
9	O-RING	AIPC 28-11-05-21-140
7	O-RING	AIPC 28-11-85-23-060
9	O-RING	AIPC 28-11-85-23-070
4	O-RING	AIPC 28-11-85-23-090

E. Referenced Information

REFERENCE	DESIGNATION
TASK 12-11-28-650-001-A	General Refuel/Defuel Safety Procedures
TASK 12-11-28-650-003-A	Pressure Refuel with Automatic Control
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 28-10-00-910-001-A	Safety Procedures When You Do Work in a Fuel Tank
TASK 28-10-00-910-002-A	Access to the Fuel Tanks and the Work Areas
TASK 28-25-00-650-001-A	Pressure Defuel
TASK 28-25-00-650-003-A	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-650-003-A-01	To Drain Remaining Fuel from the Wing Tanks and the Center Tank
TASK 28-25-00-869-001-A	Fuel Transfer
TASK 57-27-11-000-001-A	Removal of the Access Panel
TASK 57-27-11-400-001-A	Installation of the Access Panel
TASK 57-27-12-000-002-A	Removal of the Rib 2 Access Panel 540AZ(640AZ) or 540BZ(640BZ)
TASK 57-27-12-400-002-A	Installation of the Rib 2 Access Panel 540AZ (640AZ) or 540BZ (640BZ)
Water Drain Valve - Inner Cell ** ON A/C NOT FOR ALL
Water Drain Valve - Wing Tank ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 28-11-41-941-074-A

A. Safety Precautions

WARNING: BEFORE YOU DO WORK IN OR NEAR A FUEL TANK, MAKE SURE THAT YOU OBEY ALL THE SAFETY PROCEDURES. THIS WILL PREVENT INJURY TO PERSONS AND/OR DAMAGE TO THE AIRCRAFT.

(1) You must obey the safety procedures when you do work in a fuel tank (Ref. AMM TASK 28-10-00-910-001).
(2) Make sure that the SAFETY BARRIER(S) are in position.

Subtask 28-11-41-860-059-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable wing tank is defueled (Ref. AMM TASK 28-25-00-650-001) .
(2) Make sure that the ACCESS PLATFORM 3M (10 FT) is below the applicable access panel 540AB(640AB).
(3) Make sure that the applicable access panel 540AB(640AB) is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(4) Make sure that the applicable wing tank surge door 540BZ(640BZ) is open and that the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) is installed.

Subtask 28-11-41-860-059-B ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Make sure that the applicable wing tank is defueled (Ref. AMM TASK 28-25-00-650-001).
(2) Make sure that the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE is in position below the applicable access panel 540AB ( 640AB).
(3) Make sure that the applicable access panel 540AB ( 640AB) is removed (Ref. AMM TASK 57-27-11-000-001) and (Ref. AMM TASK 28-10-00-910-002).
(4) Make sure that the applicable rib 2 access panel 540BZ ( 640BZ) is removed (Ref. AMM TASK 57-27-12-000-002).

4. Procedure
Subtask 28-11-41-420-060-A

A. Preparation for Installation
(1) Clean the component interfaces and the adjacent area with a Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-General - - (Material No.08BAA9) .
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Apply Turbine Fuel-- Kerosene - (Material No.01ABA1) or Mineral Oil base Grease-- Vaseline or Petrolatum - (Material No.03FAB1) to the new AIPC 28-11-05-21-090 O-RING (4) or AIPC 28-11-85-23-090 O-RING (4), AIPC 28-11-05-21-130 O-RING (7) or AIPC 28-11-85-23-060 O-RING (7) and AIPC 28-11-05-21-140 O-RING (9) or AIPC 28-11-85-23-070 O-RING (9).

Subtask 28-11-41-420-054-C

B. Installation of the Water Drain Valve
(1) Install the O-ring (4) on the union (3).
(2) Install and tighten the union (3) on the water drain valve (5).

NOTE: You must bond one of the bolts (8) (Ref. AMM TASK 20-28-00-912-802).

(3) Put the bolts (8) in position then install one O-ring (7) on each bolt (8).
(4) Install the O-ring (9) on the water drain valve (5).
(5) Install the water drain valve (5) as follows:
(a) Install the water drain valve (5) and the bonding lead (10) then install and tighten the nuts (6).

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.

(b) Make sure that one of the bolts (8) is correctly bonded (Ref. AMM TASK 20-28-00-912-802).
(6) Remove the blanking cap from the end of the pipe (1).
(7) Carefully install the pipe (1) in the union (3) then install and tighten the nut (2).
(8) Apply Coating Sealant-Fuel Tank Brushable - (Material No.06HAA1) to the nuts (6) and the ends of the bolts (8).

Subtask 28-11-41-410-053-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 98D57004014000 HOOK-COVER (RIB2-SURGE DOORS) from the applicable wing tank surge door 540BZ 640BZ.
(3) Carefully close the applicable wing tank surge door 540BZ 640BZ.
(4) Install the applicable access panel 540AB 640AB (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-11-41-410-053-B ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Install the applicable rib 2 access panel 540BZ ( 640BZ) (Ref. AMM TASK 57-27-12-400-002).
(3) Install the applicable access panel 540AB ( 640AB) (Ref. AMM TASK 57-27-11-400-001).

Subtask 28-11-41-650-073-A

D. Fuel Configuration
(1) Refuel the applicable wing tank to approximately 1000 kg (2205 lb) (Ref. AMM TASK 12-11-28-650-003).

Subtask 28-11-41-790-053-A

E. Leak Test
(1) Examine the water drain valve (5) and the bottom skin joint for leaks.

5. Close-up
Subtask 28-11-41-650-074-A

A. Fuel Configuration
(1) Refuel, defuel or transfer fuel as necessary (Ref. AMM TASK 12-11-28-650-001), (Ref. AMM TASK 28-25-00-650-003) or (Ref. AMM TASK 28-25-00-869-001).

Subtask 28-11-41-942-053-A

B. Removal of Equipment
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the safety barriers.
(3) Remove the access platform(s).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.02 06:17:05 UTC