S 012-334

 (3)  
Open the left and right core cowl panels (AMM 71-11-06/201).

 S 012-047
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (4)  Open the left and right thrust reversers (AMM 78-31-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 042-049
 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 INSTALL
 THE LE FLAP SAFETY LOCKS.  THE LE FLAPS CAN MOVE QUICKLY IF YOU
 DO NOT INSTALL THE SAFETY LOCKS CORRECTLY.  THIS CAN CAUSE

 INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (5)  
Do this task: "Extended Leading Edge Flaps Deactivation and Safety Locks Installation" (AMM 27-81-00/201).

 S 012-050

 (6)  
Remove these access panels (AMM 54-62-00/201):

 (a)  
Access panel 452AL/482AL on the left side of the strut at NSTA 164.

 (b)  
Access panel 452EL/482EL on the left side of the strut at NSTA 217.

 (c)  
Access panel 452CL/482CL on the left side of the strut at NSTA 186.

 S 582-051
 (7)  Level the airplane to a minimum of one-half degree (AMM 08-00-00/201).
 S 162-052
 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.
 (8)  Make sure you remove all unwanted materials (spilled sealant, fasteners, tie wires, etc.) from the midspar upper surface and the midspar forward drain inlet (NSTA 212).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 F.  Forward Tube Leak Check T1 - Outboard (Figs. 201 and 202)
 S 942-053
 (1)  
Put an empty container below the strut forward drain outlet
 (NSTA 154).

 S 792-054

 (2)  
With a funnel and hose, apply water over the top surface of the midspar, through access door 452EL/482EL at NSTA 217 as follows:

 (a)  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 792-055
 (3)  
Make sure you see no water leaks at the tube connections.

 S 792-056

 (4)  
After three minutes, make sure that a minimum of 236 fluid ounces (6980 ml) of water has collected in the container.

 S 392-057

 (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 362-058
 (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.
　
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