EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-07
 ALL  ú ú 02B Page 424 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 214-049
 (9)  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 | .............................................................. | 0.50 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) | .............................................................. | 0.30 INCH | Between the fuel tube and the upper | | | link - outboard struts (Figure 402, Sheet 1)| .............................................................. | 0.50 INCH | Between the fuel tube and pneumatic | | | ducting - outboard struts | | | (Figure 402, sheet 1) | 2.............…..............................................1
 ~............................................................ | NEAR THE POSITION OF ANY PART THAT CAN MOVE | | (OPERATING MECHANISM) | .............................................................. | 0.50 INCH | At locations that are not supported | .............................................................. | 0.25 INCH | At locations that are supported if it | | | is not possible for chafing or | | | interference to occur | 2.............…..............................................1
 ~............................................................ | BETWEEN TUBES THAT CROSS OR RUN PARALLEL | .............................................................. | 0.50 INCH | Or the distance measured between tubes at | | | clampblocks locations when the tube run is | | | held parallel by clampblocks (whichever is | | | smaller) | .............................................................. | 0.25 INCH | Between non-parallel tubes that go | | | through the same clampblock support, within | | | three inches of that clampblock support | 2.............…..............................................1
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-07
 ALL  ú ú 01B Page 425 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 434-050
 (10)
 Install the main fuel supply hose to the raceway coupling (AMM 71-00-02/401).

 S 424-051

 (11)
 Install the spacers, washers, screws and caps to the fuel tube in the service disconnect area (View C).

 S 434-052

 (12)
 Do these steps to install the bonding jumpers (View J):

 (a)  Solvent wipe the fuel tube(s) at the locations where the saddle
 clamps and the bonding jumper clamps are installed
 (SWPM 20-20-00).
 NOTE:____ Do not apply any type of coating to the fuel tubes,
 couplings or clamps.
 (b)  Attach the bonding jumper to the bonding clamp with the bolts,
 washers, and nuts (SWPM 20-20-00).
 NOTE:____ If two bonding jumpers are attached to the same
 bonding clamp, do not put a washer between the bonding
 jumpers.
 (c)  Do a check of the bonding resistance between the fuel tube(s)
 and the airplane structure (SWPM 20-20-00).
 1)  Make sure the resistance is not more than 0.010 ohm.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-22-07
 ALL  ú ú 01B Page 426 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 G. Do a Leak Check for the Fuel Line in the Strut Area
　
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