(e)  
Make sure the counts agree.

 (f)  
Make sure you remove all sponges and cotton rags from the fuel tank.

 WARNING: SPONGES AND RAGS USED TO CLEAN THE FUEL TANK ARE A FIRE
_______ HAZARD. FOLLOW APPROVED PROCEDURES FOR FUEL SOAKED SPONGES AND RAGS. DO NOT PUT FUEL SOAKED SPONGES AND RAGS IN UNAPPROVED BARRELS. SPONGES AND RAGS THAT ARE NOT CORRECTLY HANDLED CAN CAUSE A FIRE. A FIRE CAN CAUSE SERIOUS INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (g)  Follow approved procedures to dispose of or clean the fuel soaked sponges and rags.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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737-300/400/500MAINTENANCE MANUAL
 L. Prepare to Go Out of and Close the Fuel Tank
 S 492-501
 (1)  VENTURI TYPE VENTILATION EQUIPMENT;
 For the center tank, do these steps:

 (a)  
Do these steps to install the center vent tube in the No. 1 cavity in the center tank if you removed it: 1) Make sure the installed the O-ring seals before you connect

 the tube couplings. 2) Install the tubes, the bracket bolt, and the bonding jumpers.

 (b)  
Do a check of the electrical bond between these components (SWPM 20-20-00): 1) The center vent tube and the left vent tube. 2) The center vent tube and the right vent tube. 3) The resistance must not be more than 0.010 ohm.

 (c)  
Remove the vent closure plugs from the vents in the No. 2 cavity and the No. 3 cavity if you installed them.

 S 092-405
 (2)  
If an air duct was used at the maintenance area, route the air duct to the access door opening.

 S 942-406

 (3)  
Go out of the fuel tank.

 S 972-407

 (4)  
If you are the observer, do these steps:

 (a)  
Make a report that states the time and that all persons are out of the tank.

 (b)  
Remove the sign that states: CAUTION - PERSONNEL INSIDE TANK - MOVE NO EQUIPMENT.

 S 092-408
 WARNING: DO NOT STOP OR START THE HEATER/AIR BLOWER OR VENTILATION
_______ BLOWER WHILE THE AIR DUCT IS IN THE FUEL TANK. THE FUEL VAPOR FROM THE FUEL TANK COULD CAUSE AN EXPLOSION AT THE HEATER/AIR OR VENTILATION BLOWER MOTOR. AN EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
 (5)  If a heater or ventilation blower was used, remove the air duct from the fuel tank.
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737-300/400/500MAINTENANCE MANUAL
 (6)  S 092-409Turn the air duct 180 degrees away from the open fuel tank.
 (7)  S 092-410Stop the heater/air and ventilation blower if used.
 (8)  S 092-411Stop the air compressor.
 (9)  S 092-412Disconnect the air supply hose from the air mover or blower(s).
 S 092-413

 (10) VENTURI TYPE VENTILATION EQUIPMENT; Do these steps to remove the air mover equipment:
 (a)  For the main tanks, do these steps: 1) Remove the air mover from the overwing fill port
 (Fig. 203).
 2) Remove the ground from the air mover.
 3) Remove the air mover adapter assembly from the overwing
 fill port.
 4) Install the cap on the overwing fill port.
 5) Install the applicable main tank access doors
 (AMM 28-11-11/401).
 (b)  
For the surge tanks, do these steps: 1) Remove the air mover from the adapter base (Fig. 203). 2) Remove the ground from the air mover. 3) Remove the tank adapter assembly from the opening of the

 surge tank access door. 4) Install the surge tank access doors (AMM 28-11-11/401).

 (c)  
For the center tank, do these steps: 1) Remove the air mover from the adapter base (Fig. 203). 2) Remove the ground from the air mover. 3) Remove the tank adapter assembly from the opening of the

 center tank access door. 4) Install the center tank access doors (AMM 28-11-31/401).
　
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