(4)
 Remove the access platform(s).

 (5)
 Close the applicable MLG door (Ref. TASK 32-12-00-410-001).

 1EFF : 301-399, 1 28-26-43Page 410 1 1 May 01/04 1 1 1CES 1 Subtask 28-26-43-865-052

 D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1QL, 2QL, 3QL.
 Subtask 28-26-43-710-050
 E. Test
 (1) Do a test of the main transfer system (Ref. TASK 28-26-00-710-001).
 5. Close-up
________ Subtask 28-26-43-650-051
 A. Fuel Configuration
 (1) Refuel, defuel or transfer fuel as necessary (Ref. TASK 12-11-28-650-003), (Ref. TASK 28-25-00-650-001) or (Ref. TASK 28-25-00-869-001).
 Subtask 28-26-43-942-050
 B. Removal of Equipment
 (1)
 Remove the safety barriers.

 (2)
 Remove the warning notice(s).

 (3)
 Remove the ground support and maintenance equipment, the special and standard tools and all other items.

 1EFF : 301-399, 1 28-26-43Page 411 1 1 May 01/04 1 1 1CES 1 CLACK VALVE - REMOVAL/INSTALLATION

__________________________________
 TASK 28-26-44-000-001
 Removal of the Main-Transfer-System Clack 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.
 WARNING : MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING
_______
 GEAR.

 1. Reason for the Job
__________________
R R Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific blanking cap
 No specific circuit breaker(s) safety clip(s)
 No specific safety barriers
 No specific warning notice
 No specific adjustable access platform 1.65 m (5 ft. 5 in.)
 No specific adjustable access platform 2.5 m (8 ft. 2 in.)
 460005835 1 GROUND LOCK SLEEVE
 98D57004014000 1 HOOK-COVER (RIB2-SURGE DOORS)

 1EFF : 301-399, 1 28-26-44Page 401 1 1 Feb 01/05 1 1 1CES 1 B. Referenced Information

 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
28-00-00-000-001 Removal of the Fuel Pipes 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 28-25-00-650-001 Pressure Defuel 28-25-00-650-003 To Drain Remaining Fuel from the Wing Tanks and the
 Center Tank
R 28-42-15-000-005 Removal of the Wing Tank Fuel-Quantity Probe (21QT1/2,23QT1/2,25QT1/2,26QT1/2,2 7QT1/2,28QT1/2,29QT1/2,30QT1/2,34QT1/2,54QT1/2,56QT1/ 2,59QT1/2,60QT1/2,61QT1/2) 32-12-00-010-001 Open the Main Gear Doors for Access 57-17-11-000-001 Removal of the Covers 147AZ (148AZ) 57-27-11-000-001 Removal of the Access Panel (540AB, 540BB, 540CB, 540DB, 540EB, 540FB, 540GB, 640AB, 640BB, 640CB, 640DB, 640EB, 640FB, 640GB) 28-26-44-991-001 Fig. 401
 3. Job Set-up
__________
 (Ref. Fig. 401/TASK 28-26-44-991-001)
 Subtask 28-26-44-941-051
 A. Safety Precautions
 WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
 (1)
 You must obey the fuel safety procedures (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.

 (2)
 Put the safety barriers in position.

 (3)
 Put a warning notice in position to tell persons not to operate the landing gear doors.

 1EFF : 301-399, 1 28-26-44Page 402 1 1 Feb 01/05 1 1 1CES 1

 Main-Transfer-System Clack Valve - Location and Detail
 Figure 401/TASK 28-26-44-991-001

 1EFF : 301-399, 1 28-26-44Page 403 1 1 May 01/04 1 1 1CES 1 Subtask 28-26-44-650-050

 B. Fuel Configuration
 (1)
 Defuel the applicable fuel tanks (Ref. TASK 28-25-00-650-001).

 (2)
 Drain the remaining fuel from the applicable fuel tank (Ref. TASK 28-25-00-650-003).

 Subtask 28-26-44-865-050
 C. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU FUEL/L WING TK/PUMP2 SPLY 7QA N26 121VU FUEL/L WING TK/PUMP1 SPLY 1QA N23 121VU FUEL/R WING TK/PUMP2 SPLY 8QA Q26 121VU FUEL/R WING TK/PUMP1 SPLY 2QA Q23 121VU FUEL/CTR TK/AUTO/CTL 3QL R27 121VU FUEL/CTR TK/L&R XFR/CTL & IND 2QL R26 121VU FUEL/CTR TK/L&R XFR/CTL & IND 1QL R25 123VU L WING TK/PUMP 1/STBY SPLY 11QA AD12 123VU R WING TK/PUMP 1/STBY SPLY 12QA AE12
　
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