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 E.  ENGINE SPAR VALVE - FUEL TRANSFER OPERATIONAL TEST; The engine spar valves have a dual function. One function is to shutoff the flow of fuel to the engine during engine shutdown. The second function is fire protection during an engine fire emergency. Because of the fire protection function, it is necessary to verify that the valve body is aligned correctly and does not leak. The Engine Spar Valve -Fuel Transfer Operational Test (AMM 28-22-00/501) must be accomplished after replacement of the valve body or valve adapter.
 F.  When persons do maintenance in the area of the wing leading edge, you must install safety locks on all the extended leading edge flaps.
 TASK 28-22-09-004-001
 2.  Engine Spar Valve Adapter Removal (Fig. 401)
_________________________________
 A.  References
 (1)
AIPC 28-22-09 Fig. 1

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

 (3)
AMM 28-11-00/201, Fuel Tanks

 (4)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (5)
AMM 28-22-01/401, Engine Fuel Shutoff (Spar) Valve Actuator

 (6)
AMM 28-26-00/201, Defueling

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 ALL  ú ú 01 Page 401 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Access
 (1)  
Location Zones 521 Leading Edge to Front Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 621 Leading Edge to Front Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right

 (2)  
Access Panels
 521EB Lower Skin Leading Edge Access Panel
 545BB Fuel Tank Access Door
 552EB Fuel Tank Access Door
 552FZ Mid Spar Access Door
 621EB Lower Skin Leading Edge Access Panel
 645BB Fuel Tank Access Door
 652EB Fuel Tank Access Door
 652FZ Mid Spar Access Door

 C.
Prepare for the Removal

 S 864-062
 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.
 (1)  Extend the leading edge flaps (AMM 27-81-00/201).
 S 044-063
 WARNING: DO THE PROCEDURE IN AMM 27-81-00/201 TO DEACTIVATE AND INSTALL
_______ LOCKS ON THE LEADING EDGE FLAPS. THE LEADING EDG FLAPS MOVE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: Extended Leading Edge Flaps Deactivation and Safety Locks Installation (AMM 27-81-00/201).
 S 654-060
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PROCEDURES.
 (3)  
Defuel the applicable main fuel tank (AMM 28-26-00/201).

 (4)
Purge and prepare to go into the main fuel tank (AMM 28-11-00/201).

 S 014-061
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 ALL  ú ú 01 Page 402 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 014-005
 (5)  If necessary, remove an additional fuel tank access door to get to the spar valve adapter shaft (AMM 28-11-02/401).
 NOTE: Refer to the table for access door locations.
____
 ~................................................................. | | Access Door | | ............................................. | Location | Main Tank | Mid Spar | ................................................................... |No. 1 Main Tank | 552EB | 552FZ | ................................................................... |No. 2 Main Tank | 545BB | | ................................................................... |No. 3 Main Tank | 645BB | | ................................................................... |No. 4 Main Tank | 652EB | 652FZ | 2.....................….....................….....................1
　
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