1EFF : ALL 1 28-11-41Page 432 1 1 Aug 01/05 1 1 1CES 1

 (4)
 Remove the water drain valve (5).

 (5)
 Remove and discard the O-rings (7) and (9).

 (6)
 Remove the union (3) from the water drain valve (5).

 (7)
 Remove and discard the O-ring (4).

 (8)
 Examine the water drain valve (5) and the adjacent aircraft structure for signs of fuel leakage.

 (9)
 If signs of fuel leakage are found, examine the applicable landing light assembly for fuel contamination (Ref. TASK 33-42-11-000-001).

R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 28-11-41Page 433 1201-299, 401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C ALL

 TASK 28-11-41-400-004
 Installation of the Water Drain Valve 25QM (26QM)
 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.
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific safety barriers
 No specific access platform 3.0 m (9 ft. 10 in.)

 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 01-001 USA ASTM-D-1655-93 (JET A-1) FUEL, TURBO (Ref. 20-31-00) Material No. 04-012 USA VV-P-236 PURE MINERALVASELINE OR PETRO- LATUM (Ref. 20-31-00) Material No. 09-007 USA MIL-S-4383 BRUSHABLE FUEL RESISTANT COATING (Ref. 20-31-00) Material No. 11-026 GB DEF-STAN 68-148/1 SOLVENT GENERAL PURPOSE (Ref. 20-31-00) Material No. 19-003 USA AMS 3819 LINT-FREE COTTON CLOTH (Ref. 20-31-00)
 1EFF : ALL 1 28-11-41Page 434 1 1 May 01/04R 1 1 1CES 1

 C. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
4 O-ring 28-11-05 21 -090 7 O-ring 28-11-05 21 -130 9 O-ring 28-11-05 21 -140
 D. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
12-11-28-650-001 General Refuel/Defuel Safety Procedures 12-11-28-650-003 Pressure Refuel with Automatic Control 20-28-00-912-002 Electrical Bonding of Components With Conductive
 Bolts and Screws in the Tanks 28-10-00-910-001 Safety Procedures When You Do Work in a Fuel Tank 28-10-00-910-002 Access to the Fuel Tanks and the Work Areas 28-11-41-991-003 Water Drain Valve - Inner Cell 28-25-00-650-001 Pressure Defuel 28-25-00-650-003 To Drain Remaining Fuel from the Wing Tanks and the
 Center Tank 28-25-00-869-001 Fuel Transfer 57-27-11-000-001 Removal of the Access Panel (540AB, 540BB, 540CB,
 540DB, 540EB, 540FB, 540GB, 640AB, 640BB, 640CB, 640DB, 640EB, 640FB, 640GB)
 57-27-11-400-001  Installation of the Access Panel (540AB, 540BB, 540CB, 540DB, 540EB, 540FB, 540GB, 640AB, 640BB, 640CB, 640DB, 640EB, 640FB, 640GB)
R **ON A/C 001-001, 051-052,
 28-11-41-991-003  Fig. 403
R **ON A/C 002-049, 053-061, 101-103, 201-203,
 28-11-41-991-003-A  Fig. 403A
 1EFF : ALL 1 28-11-41Page 435 1 1 May 01/05 1 1 1CES 1 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------

**ON A/C 301-399,
 28-11-41-991-003-C Fig. 403B
R  **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499, Post SB 28-1077 For A/C 001-049,051-061,101-103,201-203, 28-11-41-991-003-B Fig. 403C **ON A/C ALL
 3. Job Set-up
__________
 Subtask 28-11-41-941-074

 A. Safety Precautions WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
 (1) You must obey the safety precautions (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.
 (2) Make sure that the safety barriers are in position.
 Subtask 28-11-41-860-059

 B. Aircraft Maintenance Configuration
 (1)
 Make sure that the applicable wing tank is defueled (Ref. TASK 28-25-00-650-001) .
　
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