S 012-122
(6)
Open the upper wing leading edge cover 521FT/621FT.
(7)
Remove the strut forward fairing No. 3 451B/481B.
(8)
Close and lock the aft fairing panels 454AL/484AL.
S 582-125
(9)
Level the airplane to a minimum of one-half degree (AMM 08-00-00/201).
S 012-123
S 012-124
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MAINTENANCE MANUAL
S 162-126
CAUTION:_______MAKE SURE YOU KEEP THE STRUT AREA CLEAN. TOOLS, LOOSE AND UNWANTED MATERIALS IN THE STRUT COMPARTMENTS CAN BLOCK THE REMOVAL OF THE FLUIDS THROUGH THE STRUT DRAINS. IF YOU DO NOT REMOVE THE UNWANTED MATERIALS, YOU CAN CAUSE DAMAGE TO THE STRUT.
(10) Make sure you remove all unwanted materials (spilled sealant, fasteners, tie wires, etc.) from the upper spar surface and the upper spar drain inlets.
F. Do Leak Check S3 - Outboard (Figs. 201 and 202)
S 942-127
(1) Apply water to the upper spar surface as follows:
(a) Put an empty container below the outlet end of the strut aft drain.
NOTE: The drain outlet is located on the aft edge of the lower
____ pan assembly on the right aft fairing panel (approximately NSTA 331).
(b) With a funnel and hose, apply water to the top surface of the upper spar (forward of NSTA 225), let the water enter the NSTA 194 bulkhead vapor barrier and both the upper spar drain inlets. 1) Apply 1 gallon (128 fl oz or 3785 ml) of water, in 3.5 to
4.5 minutes.
NOTE: This is approximately 32 fluid ounces (1/4 gallon or
____ 950 ml) per minute for 4 minutes.
S 792-129
(2)
Make sure there is no water leakage from the strut forward drain outlet.
S 792-130
(3)
Make sure you see no water leakage through the NSTA 194 bulkhead vapor barrier.
S 792-131
(4)
After three minutes, make sure that a minimum of 115 fluid ounces (3401 ml) of water has collected in the container.
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747-400 MAINTENANCE MANUAL
S 392-132
(5) If you found water leaks during the test, do these steps:
(a)
If the leak is from a tube, do the procedure to repair the tube (AMM 20-11-05/801).
(b)
If the leak is from a seal, do the procedure to seal the applicable area of the leak (AMM 51-31-01/201).
(c)
After you repair the leak, do the applicable leak test again.
S 362-133
(6) If you did not collect the correct amount of water and cannot find leaks, do these steps:
(a)
Do the task to clear the applicable strut drain.
(b)
If you cannot remove the blockage with air, use a thin wire to clear the applicable drain tube.
(c)
Continue to remove the blockage in the tube and do the leak test again until you collect the correct amount of water.
G. If you will not do more leak checks at this time, put the airplane back to its usual condition.
S 162-134
CAUTION:_______MAKE SURE YOU KEEP THE STRUT AREA CLEAN. TOOLS, LOOSE AND UNWANTED MATERIALS IN THE STRUT COMPARTMENTS CAN BLOCK THE REMOVAL OF THE FLUIDS THROUGH THE STRUT DRAINS. IF YOU DO NOT REMOVE THE UNWANTED MATERIALS, YOU CAN CAUSE DAMAGE TO THE STRUT.
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