S 434-015
 (5)  
Tighten the bolts that attach the fuel tube clamps to the support brackets.

 S 214-016

 (6)  
Do a check of the minimum clearance between the fuel tube and the structure:

 NOTE: The supported area of a tube is defined as the section of
____ the tube that is within three inches of a bulkhead nut that attaches the tube to a rigid piece of equipment.
 ~............................................................ | BETWEEN THE FUEL LINE AND ADJACENT STRUCTURE | .............................................................. | 0.20 INCH | At locations that are not supported | .............................................................. | 0.10 INCH | At locations that are supported (or the | | | thickness of the supported clamps when the | | | fuel tubing is clamped directly to the | | | structure) | 2.............…..............................................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-018
 (7)
Do these steps to install the bonding clamps and bonding jumpers:

 (a)  
Solvent wipe the fuel tube(s) at the locations where the clamps and bonding jumpers are installed (SWPM 20-20-00).

 NOTE: Do not apply any type of coating to the fuel tubes,
____ couplings or clamps.
 (b)  
Hold the bonding clamps on the fuel tube(s).

 (c)  
Attach the bonding jumper to the bonding clamp with the bolt, washers, and nut (SWPM 20-20-00).

 (d)  
Make sure the bonding jumper does not contact the fuel quantity units.

 NOTE: If necessary, re-position the bonding clamp to a
____ different position to remove unwanted slack from the bonding jumper.
 (e)  Do a check of the bonding resistance between the fuel tube(s) and the airplane structure (SWPM 20-20-00).
 NOTE: The resistance must not be more than 0.010 ohm.
____
 S 794-019
 (8)  Do a check of the fuel lines for the engine fuel-feed system for leakage (AMM 28-22-07/601).
 S 434-020
 CAUTION: YOU CANNOT TIGHTEN THE FUEL LINE COUPLING AFTER THE INITIAL
_______ INSTALLATION. YOU MUST INSTALL NEW O-RINGS WHEN YOU TIGHTEN THE FUEL LINE COUPLING AGAIN OR A FUEL LEAK CAN OCCUR.
 (9)  
If you must tighten the fuel line coupling again, disconnect the fuel line coupling and install new O-rings (AMM 28-00-00/201).

 S 864-021

 (10)
 Go out of the fuel tank(s) and install the access panels (AMM 28-11-00/201).

 TASK 28-22-07-004-022
 4. Fuel Line - Engine Disconnect to the Forward Wing Spar Removal
______________________________________________________________
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 
MAINTENANCE MANUAL 
INBOARD STRUT 
SEE  C 
OUTBOARD STRUT 
FUEL PUMP  FUEL PUMP  SEE  B 
LOCATION  LOCATION  FUEL PUMP 
SEE  A  SEE  A  DRAIN PLUGS 
SEE  D 
WING LEADING 
EDGE COVER  482CR 452CR  482BR  FUEL PUMP LOCATION 
452BR  A 
482AR 
452AR 

OUTBOARD STRUT 
(RIGHT SIDE IS SHOWN)  WING LEADING 
EDGE COVER  471FR 
B  462FR  472CR  472BR 
462CR  462BR 
472AR 
462AR 
MAIN FUEL 
SUPPLY LINE 

INBOARD STRUT 
(RIGHT SIDE IS SHOWN) 
PLUG 
FUEL PUMP  PACKING  C 
MAIN FUEL 
SUPPLY FLANGE 

FUEL PUMP DRAIN PLUG
　
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