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 ALL  ú ú 01N Page 210 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  After three minutes, make sure that a minimum of 236 fluid ounces (6980 ml) of water has collected in the container.
 S 362-078
 (3)  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 362-079
 (4)  If you do 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 until you collect the correct amount of water.
 S 162-080
 (5)  Make sure there are no unwanted materials on the upper spar surfaces, upper spar drain inlets, closure spar surfaces, and the closure spar drain inlet.
 S 792-081
 (6)  Apply water to the closure spar inlet 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 closure spar inlet which is between the NSTA 251 strut to wing vapor barrier and the NSTA 225 bulkhead.
 (c)  Apply 254 to 258 fluid ounces (7510 to 7630 ml) of water, in 3.5 to 4.5 minutes.
 NOTE:____ This is approximately 64 fluid ounces (1/2 gallon or 1900 ml) per minute for 4 minutes.
 S 792-082
 (7)  Make sure there are no leaks as follows: (a) Make sure you do not see any water leaks at the tube connections.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 54-53-00
 ALL  ú ú 01N Page 211 ú Oct 10/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  After three minutes, make sure that a minimum of 236 fluid ounces (6980 ml) of water has collected in the container.
 S 362-083
 (8)  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 362-084
 (9)  If you do 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 until you collect the correct amount of water.

 S 162-085
 (10) Make sure there are no unwanted materials on the closure spar surfaces and the closure spar drain inlet.
 G.  If you will not do more leak checks at this time, put the airplane back to its usual condition.
 S 162-086
 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.
 (1)  
Make sure you remove all unwanted materials from the strut cavities.

 (2)  
Install the upper wing leading edge cover.

 (3)  
Open the aft fairing panels (AMM 54-62-00/201).

 S 412-088
 S 012-089
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
　
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