S 216-030
 (1)  
Inspect the No. 1 boost pump conduit for any damage.

 S 216-031

 (2)  
Inspect the No. 4 boost pump conduit for any damage.

 S 026-032

 (3)  
Remove and replace any damaged conduit (AMM 28-22-06/401).

 E.
Put the Airplane Back to Its Usual Condition

 S 836-033
 (1)  
Get out of and close the No. 2 or 3 inboard main fuel tank
 (AMM 28-11-00/201).

 (2)
Install the applicable access panel 545BB/645BB (AMM 28-11-02/401).

 S 416-034
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-06
 ALL  ú ú 01 Page 611 ú Feb 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 ENGINE FUEL FEED SYSTEM FUEL LINE - REMOVAL/INSTALLATION
________________________________________________________
 1.  General_______
 A.  This procedure contains information for the removal and the installation of the fuel lines for the engine fuel-feed system. This procedure also contains a task for the removal and installation of the fuel line in the strut area. Each line contains tubes, which are connected by tube couplings.
 B.  When it is necessary for removal and installation, long tubes can be cut into shorter sections. When you make the replacement tubes, cut the tubes in short sections. Make sure the length of the replacement tubes allow for the rigid couplings between each length of the tube.
 C.  Begin the tube installation on a structure that has a rigid coupling such as a bulkhead, valve, or pump fitting. Make sure the last connection point is a flexible full coupling.
 D.  Do not loosen a rigid coupling to help install other couplings in the fuel line.
 TASK 28-22-07-004-001
 2.  Fuel Line Removal_________________
 A.  References
 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-26-00/201, Defueling

 (3)
AIPC 28-15-03, Fig. 1

 B.  
Access

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-07
 ALL  ú ú 01B Page 401 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400
MAINTENANCE MANUAL

 (2)  
Access Panels
 545AB Fuel Tank Access Door
 545CB Fuel Tank Access Door
 545DB Fuel Tank Access Door
 546BB Fuel Tank Access Door
 552AB Fuel Tank Access Door
 552BB Fuel Tank Access Door
 552CB Fuel Tank Access Door
 552DB Fuel Tank Access Door
 552EB Fuel Tank Access Door
 552FB Fuel Tank Access Door
 553BB Fuel Tank Access Door
 553CB Fuel Tank Access Door
 553DB Fuel Tank Access Door
 553EB Fuel Tank Access Door
 553FB Fuel Tank Access Door
 553GB Fuel Tank Access Door
 553HB Fuel Tank Access Door
 553JB Fuel Tank Access Door
 645AB Fuel Tank Access Door
 645CB Fuel Tank Access Door
 645DB Fuel Tank Access Door
 646BB Fuel Tank Access Door
 652AB Fuel Tank Access Door
 652BB Fuel Tank Access Door
 652CB Fuel Tank Access Door
 652DB Fuel Tank Access Door
 652EB Fuel Tank Access Door
 652FB Fuel Tank Access Door
 653BB Fuel Tank Access Door
 653CB Fuel Tank Access Door
 653DB Fuel Tank Access Door
 653EB Fuel Tank Access Door
 653FB Fuel Tank Access Door
 653GB Fuel Tank Access Door
 653HB Fuel Tank Access Door
 653JB Fuel Tank Access Door

 C.
Procedure

 (1)
Defuel the applicable tank (AMM 28-26-00/201).

 S 654-002
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