28-11-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(h)
Make a mark to show the location of the leak points on the inner surface of the tank.
(i)
Remove the soap solution fully from the inner surface of the tank.
(j)
If you do not find the leak after a time of approximately 20 minutes, try the procedure: Hollow Bolt Dye Injection Procedure.
S 796-086
(2) Do the hollow bolt and dye injection procedure.
(a) If you used the leak tracing device F71329 in other tests, obey the instructions on the cover of the container to apply the dye and air pressure to the bolts.
NOTE: If you used alternative equipment, do the applicable
____
steps.
(b) These dyes are recommended: 1) Fluorescent dye: Mix 1 fluid ounce of bright green dye or bluish-white dye to 1 gallon of fuel.
2) Non-fluorescent dye: Mix a maximum of 2 fluid ounces of dye to 100 gallons of fuel.
NOTE: Do not use too much dye to keep the stain on the
____ tank surface to a minimum.
(c) When you see the dye on the inner surface of the tank, make a mark to show the leak position
TASK 28-11-00-706-243
4. Helitest Leak Detection Procedure
_________________________________
A. Equipment
(1)
HeliTest Wing Kit - Varian Vacuum Products, Inc. - 121 Hartwell Avenue, Lexington, MA 02173, Phone: 1-800-882-7426 (USA only)
(2)
Helium - compressed, industrial grade, standard cylinder
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28-11-00
ALL ú ú 01 Page 621 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B.
C.
D.
A
737-300/400/500MAINTENANCE MANUAL
(3)
Regulator - pressure, and gage for helium cylinder
(4)
Ventilation equipment - positive and negative to control and evacuate helium
(5)
Source - compressed air, to blow areas dryConsumable Materials
(1)
B01002 Solvent, General Cleaning of Solvent Resistant Organic Coatings - Series 82 (AMM 20-30-82/201 or SOPM 20-30-82)
(2)
G50004 Tape, vacuum - SMS126 or SMS 127
(3)
G00252 Material, Plastic Sheeting (polyethylene) - L-P-512
(4)
G02329 Tape, high-speed - 3M #434
(5)
AMM 20-30-82/201, Aiplane Structure Cleaning Solvents (Series 82)
(6)
AMM 28-10-00/201, Fuel Tanks
(7)
AMM 28-11-00/801, Fuel Tanks
(8)
AMM 28-23-00/201, DefuelingAccess
(1)
Location Zones 221 Center Section Fuel Tank 304 Left Surge Tank 305 Left Fuel Tank 404 Right Surge Tank 405 Right Fuel Tank
Procedure
S 796-244
(1) Do these steps to find the external leaks and to make a map of them:
NOTE: You must make a precise map of the leaks for this procedure
____
to find the leakage.
(a)
Clean the external wing surface around the area where you think the leak is.
(b)
Use solvent to remove the grease from the area.
(c)
Dry the area.
(d)
Apply a mapping agent to the area. 1) Use talcum powder or a similar powder for a mapping agent.
(e)
For running leaks, do these steps: 1) Find the origin of the leak. 2) Stop the fuel flow with mastic or tape to make sure that
there are no other paths for fuel flow.
(f)
When the leak is found, remove the seat from the leak site and find the origin of the leak precisely within the seal.
S 656-245
(2)
Defuel the tank that has the leak. To do this, do this task: Fuel Tank Defueling (AMM 28-23-00/201) or do this task: Tank to Tank Fuel Transfer (AMM 28-23-00/201).
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