(e)  
Apply air pressure to the right and left upper spar drain exits (NSTA 242). 1) Cover the right and left upper spar drain inlets (NSTA 228)

 with rags to collect the unwanted materials.

 (f)  
Make sure the air comes out of the drain inlets freely.

 (g)  
Remove the air pressure from the drain line exits.

 (h)  
Remove the rags and unwanted materials from the drain inlets.

 (i)  
Apply air pressure to the aft upper strut drain exit (NAC STA 321). 1) Cover the vapor barrier bay drain inlet (NSTA 307) with a

 rag to collect the unwanted materials.

 (j)  
Make sure the air comes out of the drain inlet freely.

 (k)  
Remove the air pressure from the drain line exit.

 (l)  
Remove the rag and unwanted materials from the drain inlet.

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747-400 MAINTENANCE MANUAL
 (m)  Do a visual check on the short drain tube at the aft edge of the lower pan assembly to see if it has been cleaned of the debris.
 S 162-040
 (5)  On the outboard struts, clean the aft drains:
 (a)  
Apply air pressure to the strut drain line exit on the aft edge of the lower pan assembly (NSTA 331). 1) Cover the door-mounted drain fitting assembly (NSTA 273)

 with a rag to collect the unwanted materials.

 (b)  
Make sure the air comes out of the drain inlet freely.

 (c)  
Remove the air pressure from the drain line exit.

 (d)  
Remove the rag and unwanted materials from the drain inlet.

 (e)  
Apply air pressure to the strut-mounted drain fitting assembly (NSTA 273).

 (f)  
Clean the closure spar drain inlet (NSTA 246) and upper spar drain inlet (NSTA 195) in sequence. 1) Block one inlet with a plug and cover the other inlet with

 a rag to collect the unwanted materials.

 (g)  
Make sure the air comes out of the drain inlets freely.

 (h)  
Remove the air pressure from the drain fitting assembly.

 (i)  
Remove the plugs, rags, and unwanted materials from the drain inlets.

 F. Restore the Airplane to Normal.
 S 412-388
 (1)  
Close the upper wing leading edge cover.

 (2)  
Close all the access panels (AMM 54-62-00/201).

 (3)  
Install the No. 3 forward fairing.

 (4)  
Close the trailing edge fairing doors (AMM 54-62-00/201).

 S 412-041
 S 412-042
 S 412-331
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 S 442-380
 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).
 S 412-379 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 412-376

 (7)  
Close the left and right core cowl panels (AMM 71-11-06/201). S 412-378
　
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