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 TASK 12-11-03-653-019
 2.  Overwing Refuel Procedure
_________________________
 A.  General
 (1)  You can do the overwing refuel procedure without electrical power if you use the fuel measuring sticks and the applicable conversion document. Refer to the task: "Refuel Operation When the Fuel Quantity Indicating System Does Not Operate" (AMM 12-11-04/301). It is necessary to use electrical power to operate the boost pumps if you move fuel to the center tank from the other tanks.
 B.  References
 (1)  
AMM 20-40-11/201, Static Grounding

 (2)  
AMM 28-23-00/201, Defueling

 C.  Access
 (1)  Location Zones
 305 Left Fuel Tank
 405 Right Fuel Tank

 D.  Procedure
 S 863-020
 (1)  If you must operate the refuel quantity indicators during the overwing refuel operation, you can use external power.
 NOTE: Do not operate the APU during overwing refueling.
____
 (a)  Make sure the tanks have the necessary quantity of fuel.
 S 863-022
 WARNING: MAKE SURE THE AIRPLANE AND THE FUEL TRUCK ARE CORRECTLY
_______
 GROUNDED. AN EXPLOSION CAN OCCUR.

 (2)  Ground the airplane and the fuel truck (AMM 20-40-11/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 943-023 WARNING: DO NOT REMOVE THE FILLER CAPS BEFORE YOU GROUND THE FUEL
_______ NOZZLES. A FIRE OR AN EXPLOSION CAN OCCUR.
 (3)  Ground the refuel nozzles to the ground jacks adjacent to the fill ports with the nozzle bonding cable.
 S 033-024 CAUTION: MAKE SURE THE FUEL LEVEL IS BELOW THE LEVEL OF THE CAP BEFORE
_______ YOU REMOVE THE CAP. FUEL CAN FLOW FROM THE PORT TO THE SURFACE OF THE WING.
 (4)  
Remove the caps from the overwing fill ports in the No. 1 tank and the No. 2 tank (Fig. 301).

 S 653-025

 (5)  
Put the refuel nozzles into the overwing fill ports. S 653-026

 (6)  
Fill the No. 1 tank and the No. 2 tank with fuel. S 653-027

 CAUTION:_______OBEY ALL OF THE LOAD SPECIFICATIONS AND LIMITS. DAMAGE TO THE AIRPLANE CAN OCCUR.

 (7)  
If you are scheduled to refuel the center tank, move fuel from the other tanks (AMM 28-23-00/201).

 S 653-028

 (8)  
Fill the No. 1 tank and the No. 2 tank with fuel again to replace the quantity that you moved to the center tank.

 S 033-029

 (9)  
When the necessary quantity of fuel is in the tanks, remove the refuel nozzles from the overwing fill ports.

 S 433-030

 (10)
 Install the caps on the overwing fill ports. S 033-031

 (11)
 Disconnect the refuel nozzles from the ground jacks.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
OVERWING 
FILL PORTS 
SEE  A 
FILLER CAP 
HANDLE 
LANYARD 
OVERWING FILL PORT 

RETAINING NUT SEAL RING
O-RINGS
OVERWING FILL PORT A
Overwing Fill Ports Figure 301
M50553
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 093-032
 (12)
 Remove the ground cables for the fuel truck.

 S 093-033

 (13)
 Remove the ground cables for the airplane.

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