(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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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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