(a)
Fuel and water drain holes and paths
(b)
FQIS components
(c)
AIRPLANES WITH A HYDROMECHANICAL FUEL SCAVENGE SYSTEM; Fuel scavenge system components.
S 212-596
(3)
Check the maintenance area for any damage to in-tank components and structure.
(a)
Repair any problems that you find.
S 212-586
(4) Do a final inspection of the fuel tank to make sure you removed all unwanted materials and equipment.
NOTE: Make sure the necessary approved persons do an inspection
____
of the tank before you close it.
S 972-599
(5)
Do a check of the record to make sure no unwanted items remain in the tank.
F.
Close the Fuel Tank
S 092-487
(1)
If an air duct was used at the maintenance area, route the air duct to the access door opening.
S 412-588
(2)
Install these components (if removed):
(a)
Access panels or structural panels
(b)
Mid spar access doors (AMM 28-11-25/401).
(3)
Go out of the fuel tank.
S 942-488
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S 972-489
(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 092-490
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.
S 092-491
(6)
Turn the air duct 180 degrees away from the open fuel tank.
S 092-492
(7)
Stop the heater/air and ventilation blower if used.
S 092-493
(8)
Stop the air compressor.
S 092-494
(9)
Disconnect the air supply hose from the air mover or blower(s).
S 092-495
(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 28-11-01/401).
(b) For the reserve and surge tanks, do these steps (Fig. 203): 1) Remove the tank adapter assembly from the opening of the
reserve or surge tank access door. 2) Remove the air mover from the adapter base (Fig. 203). 3) Remove the ground from the air mover. 4) Install the reserve tank access doors (AMM 28-11-02/401). 5) Install the surge tank access doors (AMM 28-11-03/401).
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747-400 MAINTENANCE MANUAL
(c) For the center wing tank, do these steps (Fig. 203): 1) Remove the air duct from the purge door opening. 2) Remove the air mover from the adapter base. 3) Remove the ground from the air mover. 4) Install the purge tank doors (AMM 28-11-06/401). 5) Install the center wing tank access door
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