S 412-275

 (4)  
Install the aft fairing panels 462QL/472QL.

 S 442-276
 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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747-400 MAINTENANCE MANUAL
 S 412-278
 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 012-374

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

 S 412-279

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

 S 442-375

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

 TASK 54-53-00-102-026
 14. Clean the Strut Drains
______________________
 A. Standard Tools and Equipment
 (1) Air source - regulated, compressed, 25-35 psi (170-240 kPa)
 B. References
 (1)  
AMM 20-11-05/401, Flairless Tubing Assembly

 (2)  
AMM 27-81-00/201, Leading Edge Flaps

 (3)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (4)  
AMM 78-31-00/201, Thrust Reverser System

 C. Access
 (1)  Location Zone
 451 Nacelle Strut 1 - Forward Fairing
 452 Nacelle Strut 1 - Torque Box
 461 Nacelle Strut 2 - Forward Fairing
 462 Nacelle Strut 2 - Torque Box
 471 Nacelle Strut 3 - Forward Fairing
 472 Nacelle Strut 3 - Torque Box
 481 Nacelle Strut 4 - Forward Fairing
 482 Nacelle Strut 4 - Torque Box

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (2)  Access Panel
 451B Forward Fairing No. 3 - Nacelle Strut 1
 452AL Nacelle Strut Access Door - Nacelle Strut 1
 454AL/R Trailing Edge Fairing Doors - Nacelle Strut 1
 521FT Wing Leading Edge Cover - Nacelle Strut 1
 461B Forward Fairing No. 3 - Nacelle Strut 2
 462AL Nacelle Strut Access Door - Nacelle Strut 2
 464AL/R Trailing Edge Fairing Doors - Nacelle Strut 2
 511CT Wing Leading Edge Cover - Nacelle Strut 2
 471B Forward Fairing No. 3 - Nacelle Strut 3
 472AL Nacelle Strut Access Door - Nacelle Strut 3
 474AL/R Trailing Edge Fairing Doors - Nacelle Strut 3
 611CT Wing Leading Edge Cover - Nacelle Strut 3
 481B Forward Fairing No. 3 - Nacelle Strut 4
 482AL Nacelle Strut Access Door - Nacelle Strut 4
 484AL/R Trailing Edge Fairing Door - Nacelle Strut 4
 621FT Wing Leading Edge Cover - Nacelle Strut 4

 D. Prepare to clean the strut drains
 S 042-381
 WARNING: DO THE DEACTIVATION PROCEDURE TO PREVENT THE OPERATION OF THE
_______ THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 012-382

 (2)  
Open the left and right fan cowl panels (AMM 71-11-04/201).
　
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