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 NOTE:____ Use the aft fairing panels for access.
 (5)  S 792-156After three minutes, make sure that a minimum of 236 fluid ounces (6980 ml) of water has collected in the container.
 (6)  S 792-157Make sure there is no puddling of water in the strut area.
 NOTE:____ Puddling is defined as more than 0.5 fluid ounce (15 ml) of water in a continuous pool.
 (7)  S 792-158Look for gaps at the strut to wing sponge seal as follows: (a) Put a bright shop light into the strut, a small distance aft of the strut to wing vapor barrier at NSTA 251. (b) Use the upper wing leading edge cover for access to view the strut to wing sponge seal. (c) Make sure there are no gaps between the sponge seal and the structure.
 NOTE:____ Light will show through gaps.
 (8)  S 392-159If 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.
 (9)  S 362-160If 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.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (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 162-161
 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.

 S 412-162

 (2)  
Install the upper wing leading edge cover 521FT/621FT.

 S 412-163

 (3)  
Open and unlock the aft fairing panels 454AL/484AL.

 S 412-164

 (4)
Install the dry bay access panels 452FL/482FL and 452GL/482GL.

 S 442-165
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAP CONTROL LEVER. WITH HYDRAULIC POWER REMOVED, THE FLAPS WILL MOVE AUTOMATICALLY BY ELECTRICAL POWER WHEN YOU MOVE THE FLAP CONTROL LEVER. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ LE FLAP SAFETY LOCK. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT DO THE STEPS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  Do this task: "Safety Locks Removal and Extended Leading Edge Flaps Activation" (AMM 27-81-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 S 412-167
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (6)
Close the left and right thrust reversers (AMM 78-31-00/201).

 S 412-363

 (7)
Close the left and right core cowl panels (AMM 71-11-06/201).

 S 412-168

 (8)
Close the left and right fan cowl panels (AMM 71-11-04/201).

 S 442-364

 (9)  
Do the activation procedure for the thrust reverser (AMM 78-31-00/201).

 TASK 54-53-00-702-169
 8. Inboard Strut, Forward Tube - Leak Check (T1)
_____________________________________________
 A. General
　
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