(5)  
AMM 28-11-03/401, Surge Tank Access Doors

 (6)  
AMM 28-26-00/201, Defueling

 (7)  
AMM 51-31-01/201, Seals and Sealing

 (8)  
SRM 51-00-00, Structures

 C.
Equipment

 (1)  
Air Source, Regulated, Dry Filtered, 0-150 psig
 (commercially available)

 (2)  
Air Source, Regulated, Dry Filtered, 0-50 psig
 (commercially available)

 (3)  
Black Light Equipment: Ultraviolet Light - explosionproof, EP215-16I-25, 15 Watts, 120 AC, 60 Hz, isolated ballast KH Industries Inc. Angola, New York (716) 549-0135

 Blacklight Blub - Sylvania, F15T8/350B1, Blacklight T-8 Preheat Fluorescent Lamp NAED: 21623 Stusser Electric Co./660 South Andover St. Seattle, Washington,

 (4)  
Markers - non-lead, Berol filmograph to mark in the tank
 (or equivalent)

 (5)  
Flashlight - Explosion-proof (commercially available)

 (6)  
F72951-1 Manometer - Water, Test Equipment

 (7)  
F71329 Tracer - Leakage, Integral Tank Leakage Test

 D.
Consumable Materials

 (1)  
C00069 Dye, Liquid Leak Detection for Fuel Systems - MIL-D-81298

 (2)  
C00071, Dye-Intense Green Fluorescent Pigment OS-31

 (3)  
C00072, Dye-Bluish White Fluorescent Pigment OS-80

 (4)  
G00034 Cloth, Process Cleaning Absorbent Wiper (cheesecloth, gauze) BMS15-5

 (5)  
G00091 - Compound, Oxygen System Leak Detection - Snoop Leak Detector (MIL-PRF-25567)

 E.
Access

 (1)  
Location Zones
 130 Center Wing Tank
 500 Wing Tanks, Left
 600 Wing Tanks, Right

 F.
Prepare to find the Internal Leak Source

 (1)  
Do this task: Fuel Tank Defueling (AMM 28-26-00/201).

 S 656-098
 S 016-101
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES IN THE PURGING AND
_______ ENTRY PROCEDURE FOR THE FUEL TANK. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (2)
Do this task: Purging and Fuel Tank Entry (AMM 28-11-00/201).

 S 016-104

 (3)  
To remove the applicable access doors, do these task(s):

 (a)
Center Wing Tank Access Door Removal (AMM 28-11-01/401).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  
Reserve or Main Tank Access Door Removal (AMM 28-11-02/401).

 (c)  
Surge Tank Access Door Removal (AMM 28-11-03/401).

 G.
Visual Procedure

 S 216-143
 (1)  Review the Analysis of Fuel Leak Cause task for information about
 the causes of fuel leaks.  Information includes:
 (a)  A list of the causes of fuel leaks.
 (b)  Discussion of leak path analysis.
 S 216-141
 (2)  Examine the area you think contains a leak for seal defects such as
 cracked or loose fillets, pinholes, or loose fasteners.
 NOTE:____ If it is necessary use mirrors to examine seals which
 are difficult to see.

 S 216-142
 CAUTION: HOLD THE AIR HOSE 1/2 INCH (13 MM) MINIMUM FROM THE AIRPLANE
_______ STRUCTURE. IF YOU DO NOT HOLD THE AIR HOSE 1/2 INCH (13 MM) MINIMUM FROM THE AIRPLANE STRUCTURE, DAMAGE TO THE SEALS CAN OCCUR.
 (3)  
Do a check of the fillet seals that you think have a bad bond.

 S 216-164

 (4)  
Rub the edges with a pencil eraser, or supply air at a maximum of 100 psig (690 kPa) and at least 1/2 inch (13 mm) from the seal.

 S 216-165

 (5)  
Look at the tank structure for cracks or distortions.

 S 216-166

 (6)  
If the leak is related to structural damage, refer to the Structural Repair Manual (SRM 51-00-00) and do the structural repair before you apply the sealant.

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