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 4. Procedure.
__________
 (Ref. Fig. 407/TASK 28-46-15-991-007, 408/TASK 28-46-15-991-008) Subtask 28-46-15-020-053
 A. Removal of the Center-Tank Fuel-Level Sensors
 (1)
 Loosen the cable clamp screw (8) and release the cable (1).

 (2)
 Loosen the electrical connector screws (4) and remove the cable (1),

 (3)
 Put blanking caps on the disconnected electrical connectors.

 (4)
 Remove the bolts (3) and (5) and the washers (2) and (6). Remove the sensor (7).

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 Sensor 20QJ, 21QJ, 22QJ Figure 407/TASK 28-46-15-991-007
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 Sensor 20QJ, 21QJ, 22QJ Figure 408/TASK 28-46-15-991-008
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 TASK 28-46-15-400-012
 Installation of the Center-Tank Fuel-Level Sensors
 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 2.5 m (8 ft. 2 in.) R No specific Torque Wrench : range 0.00 to 1.20 m.daN R (0.00 to 9.00 lbf.ft)
 B. Consumable Materials
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 09-007  USA MIL-S-4383 BRUSHABLE FUEL RESISTANT COATING (Ref. 20-31-00)
 Material No. 11-004  USA MIL-T-81533
 1.1.1TRICHLOROETHANE (METHYL CHLOROFORM)
 (Ref. 20-31-00)

 Material No. 19-003  USA AMS 3819
 LINT-FREE COTTON CLOTH (Ref. 20-31-00)

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 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
12-11-28-650-003  Pressure Refuel with Automatic Control
 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
 28-25-00-869-001  Fuel Transfer
 28-46-00-740-001  Functional (BITE) Test
 32-12-00-010-001  Open the Main Gear Doors for Access
 32-12-00-410-001  Close the Main Gear Doors after Access
 57-17-11-000-001  Removal of the Covers 147AZ (148AZ)
 57-17-11-400-001  Installation of the Covers 147AZ (148AZ)
 28-46-15-991-007  Fig. 407
 28-46-15-991-008  Fig. 408
 3. Job Set-up__________
 Subtask 28-46-15-941-070
 A. Safety Precautions

 WARNING : OBEY THE SAFETY PROCEDURES WHEN YOU DO WORK IN A FUEL TANK.
_______
 (1)
 Make sure that the safety barriers are in position.

 (2)
 You must obey the fuel safety procedures (Ref. TASK 28-10-00-910-001) when you do work in a fuel tank.

 Subtask 28-46-15-860-051
 B. Aircraft Maintenance Configuration
 (1)
 Make sure that the applicable fuel tank is defueled (Ref. TASK 28-25-00-650-001) .

 (2)
 Make sure that the access platform is below the applicable access panel 147AZ (148AZ).

 (3)
 Make sure that the applicable access panel 147AZ (148AZ) is removed (Ref. TASK 28-10-00-910-002), (Ref. TASK 57-17-11-000-001).

 (4)
 Make sure that the MLG door is open (Ref. TASK 32-12-00-010-001).

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 (5) Make sure that the GROUND LOCK SLEEVE is on the applicable MLG door actuating-cylinder.
 Subtask 28-46-15-865-071
 C. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
　
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