NOTE: You can monitor the leak area for a longer time to make sure
____
 the repair is satisfactory.

 S 796-031
 (4)  
If you repaired a fastener, you can use the vacuum cup, ST8744, to make sure it does not have a leak (Fig. 612).

 (a)  
Attach a vacuum source (10 psi) to the vacuum cup.

 (b)  
Put the vacuum cup on the fastener that you repaired.

 (c)  
Apply the vacuum pressure (10 psi).

 (d)  
If no bubbles or other leak indications occur, you repaired the fastener correctly.

 S 166-028
 (5)  
Make sure there are no fuel leaks.

 S 396-029

 (6)  
If you removed aerodynamic smoother to find the external leak, repair the hole (AMM 51-31-01/201).

 S 416-030

 (7)  
Install any skin panels that were removed.

 S 866-272

 (8)
Do this task: Put the Airplane Back to the Usual Condition

 TASK 28-11-00-806-213
 9. Put the Airplane Back to the Usual Condition
_____________________________________________
 A. General
 (1)
Do this task after you have completed the fuel leak procedures.

 B.
Reference

 (1)  
AMM 27-51-00/201, Trailing Edge Flap System

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A
747-400
MAINTENANCE MANUAL

 (2)  
AMM 27-81-00/201, Leading Edge Slat System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 C.
Procedure

 S 086-085
 WARNING:_______DO THE PROCEDURE IN AMM 27-81-00/201 TO REMOVE THE LOCKS. THE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  Remove the leading edge flap safety locks, if installed
 (AMM 27-81-00/201).

 S 086-082
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER.
 (2) Retract the leading edge flaps if necessary (AMM 28-11-02/401).
 S 086-083
 WARNING:_______THE TE FLAPS CAN MOVE QUICKLY. FOLLOW THE (AMM 27-51-00/201) PROCEDURE WHEN YOU REMOVE THE LOCKOUT EQUIPMENT FOR THE TE FLAPS. TE FLAPS MOVEMENT CAN CAUSE DAMAGE TO EQUIPMENT AND INJURY TO PERSONNEL.
 (3)  Reactivate the TE flaps if necessary (AMM 27-51-00/201).
 S 086-084
 WARNING: DO THE PROCEDURE IN AMM 32-00-30/201 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUCKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  Remove the door locks for the wing and body gear if installed (AMM 32-00-30/201).
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747-400 MAINTENANCE MANUAL
 FUEL TANKS - CLEANING/PAINTING
______________________________
 1.  General
_______
 A.  This procedure contains these tasks:
 (1)  
Detection Check for Contamination With Microbes or Fungus.

 (2)  
Apply the Biocide to the Fuel Tanks.

 (3)  
Fuel Tanks Contaminated with Red Dye

 (4)  
Fuel Tank Cleaning, Microbial Growth, and Corrosion Removal.

 (5)  
Apply the Corrosion Resistant Finish (Topcoat)

 B.  
Microbes or fungus are the usual cause of structural corrosion of the fuel tank. They also cause deterioration of the components in the fuel tank. The microbes and fungus increase in number at the interface of the fuel and the water. To prevent this problem, decrease the quantity or remove all of the water kept in the tanks.

 C.  
　
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