(4)  
AMM 28-11-00/201, Fuel Tanks

 (5)  
AMM 28-11-01/401, Center Wing tank Access Doors

 (6)  
AMM 28-11-02/401, Reserve and Main Tank Access Doors

 (7)  
AMM 28-15-00/201, Fuel Scavenge System

 (8)  
AMM 28-21-03/401, Manifold Drain Valve

 (9)  
AMM 28-22-01/401, Crossfeed Valve Actuator

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747-400 MAINTENANCE MANUAL
 (10)
 AMM 28-22-07/401, Fuel Line for the Engine Fuel-Feed System

 (11)
 AMM 28-26-00/201, Defueling

 (12)
 AMM 28-31-04/401, Fuel Jettison Transfer Valve Actuator

 (13)
 AMM 28-41-01/401, Pressure Switch

 (14)
 AMM 32-00-30/201, Landing Gear Door Locks

 D.
Access

 (1)  
Location Zones
 131 Center Section Wing Box, Left
 132 Center Section Wing Box, Right
 500 Left Wing
 600 Right Wing

 (2)  
Access Panels
 544AB Fuel Tank Access Door
 644AB Fuel Tank Access Door
 521BB Fueling Station Access Door
 521CB Fueling Control Panel Access Door
 621BB Fueling Station Access Door

 E.
Prepare for the Pressure Check

 S 866-201
 (1)
Supply electrical power (AMM 24-22-00/201).

 S 656-134

 (2)
Defuel the fuel tanks (AMM 28-26-00/201).

 S 866-202
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LEADING
_______ EDGE AND TRAILING EDGE 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.
 (3) Extend the leading edge flaps (AMM 27-81-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 486-203
 WARNING: DO THE PROCEDURE IN AMM 27-81-00/201 TO DEACTIVATE AND INSTALL
_______ LOCKS ON THE LEADING EDGE FLAPS. THE LEADING EDGE FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (4)  Do this task: Extended Leading Edge Flaps Deactivation and Safety Locks Installation (AMM 27-81-00/201).
 S 486-204
 WARNING: DO THE PROCEDURE IN AMM 32-00-30/201 TO INSTALL THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (5)  
Install the door locks for the wing and body landing gear (AMM 32-00-30/201).

 S 866-136

 (6)  
AIRPLANES WITH A HYDROMECHANICAL SCAVENGE SYSTEM; Remove the left and right scavenge system fuel strainers from the rear spar (AMM 28-15-00/201).

 S 866-205

 (7)  
Make sure these valves remain closed for the entire pressure check procedure:

 (a)  
Engine shutoff valve (spar valve) 1, 2, 3 and 4

 NOTE: Make sure the engine control switches are in the cutoff
____ position and the spar valve actuators are in the CLOSED position.
 (b)  Jettison nozzle valve, left and right
 NOTE: Make sure the JETTISON switch is in the OFF position
____ and the L and R NOZZLE switches are in the closed position (the ON light does not show).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 866-300
 (8)  
Make sure the flaps are not in the take-off position.
　
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