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747-400 MAINTENANCE MANUAL
S 796-181 CAUTION: DO NOT USE MORE THAN A MAXIMUM PRESSURE OF 4.0 PSIG (27 KPA).
_______ IF YOU USE MORE PRESSURE, YOU CAN CAUSE DAMAGE TO EQUIPMENT.
(6)
Supply air pressure (maximum of 4 psig, 27 kPa), to the tracer, F71329 and look for air bubbles in the fuel tank.
S 796-180
(7)
Apply the soap solution to the area in the fuel tank that you think contains the leak.
S 796-172
(8)
Make a mark at the locations where you see air bubbles in the fuel tank.
S 086-173
(9)
Remove the hollow bolt.
S 166-248
(10)
Clean the bubble solution from in the fuel tank.
S 426-174
(11)
Install the fastener.
NOTE: Refer to the SRM manual for fastener installation.
____
J. Dye Injection with Hollow Bolt Method (Fig. 607, 608) NOTE: Use this method only after you use the Air Bubble with
____
Hollow Bolt Method.
S 016-236
(1) Remove a fastener.
NOTE: Refer to the SRM for fastener removal.
____
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747-400 MAINTENANCE MANUAL
(2) S 486-237Install the hollow bolt assembly F70206-1 (Fig. 607).
(3) S 486-238Connect the integral fuel tank leak tracing device, F71329, to the hollow bolt (Fig. 607).
S 486-276
WARNING: BLOW INTO THE MANOMETER AND MAKE SURE THE WATER LEVEL CHANGES
_______ TO MAKE SURE THE WATER MANOMETER OPERATES SAFELY. MAKE SURE THE OPEN END OF THE MANOMETER IS CLEAR. IF THE WATER MANOMETER DOES NOT OPERATE CORRECTLY, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT COULD OCCUR.
(4)
Connect the water manometer, F72951-1 to the hollow bolt (Fig. 608).
S 796-239
(5)
Add dye, MIL-D-81298, through the hollow bolt.
NOTE: Use a maximum concentrations of 2 fluid ounces per
____ 100 gallons (0.16 liters dye per 100 liters) of fuel.
NOTE: You can also use fluorescent dye, Shannon OS-31 or OS-80 dye
____ in a maximum concentrations of 2 fluid ounces per 100 gallons
(0.16 liters dye per 100 liters) of fuel. Use an ultraviolet light inside the tank to find the internal leak source.
S 796-240
(6)
Make a mark at the location where you first see the dye.
S 086-277
(7)
Disconnect the water manometer.
S 086-242
(8)
Remove the integral fuel tank leak tracing device.
S 086-243
(9)
Remove the hollow bolt.
S 166-249
(10)
Use a cloth and remove all the dye.
(11)
Install the fastener.
S 416-244
NOTE: Refer to the SRM for fastener installation.
____
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747-400 MAINTENANCE MANUAL
K. Dye Injection Method
NOTE: This method injects dyed fuel through the external leak
____ point to find the internal leak source. You can use Red Automate dye, MIL-D-81298, in maximum concentrations of 2 fluid ounces per 100 gallons (0.16 liters dye per 100 liters) of fuel.
NOTE: You can also use fluorescent dye, Shannon OS-31 or OS-80 dye in a
____ maximum concentrations of 2 fluid ounces per 100 gallons
(0.16 liters dye per 100 liters) of fuel. Use an ultraviolet light inside the tank to find the internal leak source.
S 486-182
(1)
Put the integral fuel tank leak tracing device, F71329, in position near the external leak.
S 796-183
(2)
Use the integral fuel tank leak tracing device, F71329, to add dye MIL-D-81298, through the external leak.
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