(6)
Close the left and right fan cowl panels (AMM 71-11-04/201).

 S 442-358

 (7)  
Do the activation procedure for the thrust reverser (AMM 78-31-00/201).

 TASK 54-53-00-702-280
 5. Outboard Strut, Forward Upper Spar - Leak Check (S2)
____________________________________________________
 A. General
 (1)  This task gives instuctions on how to do a leak check (S2) of the forward upper spar structures on the outboard engine strut.
 B. Equipment
 (1)  
Water source - low pressure, can spray up to 2 quarts (1.9 liters) per minute

 (2)  
Container - 5 gallon (19 liter) capacity, can collect and measure water to within 1 fluid ounce (30 ml) (measure can be done in smaller containers)

 (3)  
Funnel - long necked

 C. References
 (1)  
AMM 08-00-00/201, Leveling and Weighing

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

 (3)  
AMM 51-31-01/201, Seals and Sealing

 (4)  
AMM 54-62-00/201, Nacelle Strut Access Panels

 (5)  
AMM 71-11-04/201, Fan Cowl Panels

 (6)  
AMM 71-11-06/201, Core Cowl Panels

 (7)  
AMM 78-31-00/201, Thrust Reverser System

 D. Access
 (1)  
Location Zone
 451 Nacelle Strut 1 - Forward Fairing
 452 Nacelle Strut 1 - Torque Box
 481 Nacelle Strut 4 - Forward Fairing
 482 Nacelle Strut 4 - Torque Box

 (2)  
Access Panel 451B No. 3 Forward Fairing - Engine 1 452AL Core Cowl to Strut Access Door - Engine 1 481B No. 3 Forward Fairing - Engine 4 482AL Core Cowl to Strut Access Door - Engine 4

 E. Prepare for the Leak Check
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 S 042-339
 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 012-281

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

 S 012-340

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

 S 012-282
 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).
 S 042-285
 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 582-286

 (6)  
Level the airplane to a minimum of one-half degree (AMM 08-00-00/201).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 012-287
 (7)  
Remove the strut No. 3 forward fairing.

 S 012-288

 (8)  
Remove access panel 452AL/482AL on the left side of the strut at NSTA 164 (AMM 54-62-00/201).

 S 162-289
　
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