B. Fuel Configuration
 (1)
 Defuel the applicable wing tank (Ref. TASK 28-25-00-650-001)>

 (2)
 Drain the fuel that remains from the applicable wing tank outer cell (Ref. TASK 28-25-00-650-003).

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 C. Get Access
 (1)
 Put the access platform in position below the applicable access panel 540KB(640KB).

 (2)
 Remove the access panel 540KB(640KB) (Ref. TASK 28-10-00-910-002) (Ref. TASK 57-27-11-000-002).

 4. Procedure
_________
 **ON A/C 001-001, 051-052,

 (Ref. Fig. 402/TASK 28-11-41-991-002) R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499, Post SB 28-1077 For A/C 001-001,051-052, (Ref. Fig. 402A/TASK 28-11-41-991-002-A) R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 Subtask 28-11-41-020-051
 A. Removal of the Water Drain Valve
 (1)
 Remove the nuts (4) and the bolts (8) and (9).

 (2)
 Remove the water drain valve (5).

 (3)
 Remove and discard the O-rings (6) and (7).

 (4)
 Loosen the nut (2) then remove the elbow (1).

 (5)
 Remove and discard the O-ring (3).

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 Water Drain Valve - Outer Cell
 Figure 402/TASK 28-11-41-991-002

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 Water Drain Valve - Outer Cell
 Figure 402A/TASK 28-11-41-991-002-A

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 Installation of the Water Drain Valve 23QM (24QM)
 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 3.8 m (12 ft. 6 in.) No specific Torque Wrench : range 0.00 to 1.20 m.daN
 (0.00 to 9.00 lbf.ft)
 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)
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 C. Expendable Parts
 -------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION  |IPC-CSN
 -------------------------------------------------------------------------------
3 O-ring 28-11-05 23 -030 6 O-ring 28-11-05 23 -090 7 O-ring 28-11-05 23 -080
 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 28-11-41-991-002 Water Drain Valve - Outer 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 57-27-11-000-002 Removal of the Access Panel (540HB, 540JB, 540KB,
 540LB, 540MB, 540NB, 540PB, 540QB, 540RB, 550AB, 550BB, 550CB, 550DB, 560AB, 640HB, 640JB, 640KB, ....)
 57-27-11-400-002  Installation of the Access Panel (540HB, 540JB, 540KB, 540LB, 540MB, 540NB, 540PB, 540QB, 540RB, 550AB, 550BB, 550CB, 550DB, 560AB, 640HB, 640JB, ....)
　
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