(a)
OUTBOARD STRUT;
Install these couplings:
1) Shrouded spar coupling (View E)
a) Connect the drain line to the shroud coupling body with the union and a new O-ring. 2) Shrouded bulkhead coupling (View D) a) Make sure the jamnut nut is tightened and the lockwire is installed.
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747-400
MAINTENANCE MANUAL
b) Connect the drain line to the shroud coupling body with the union and a new O-ring. 3) Flexible-full coupling (two locations) (View C)
(b) INBOARD STRUTS;
Install these couplings:
1) Spar coupling (View G)
2) Bulkhead coupling (View F)
a) Make sure the jamnut nut is tightened and the lockwire is installed. 3) Flexible-full coupling (three locations) (View C).
S 434-086
(3) Tighten the bolts that attach the clamp blocks to the support brackets.
NOTE: Make sure to replace the shims (if removed) from the clamp
____
blocks.
S 214-087
(4) 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
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~............................................................ | 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
S 764-088
(5)
Do a check of the bonding resistance between the fuel tube(s) and the airplane structure (View H) (SWPM 20-20-00).
(a)
Solvent wipe the fuel tube(s) at the locations where the bonding jumper clamps are installed (AMM 20-11-14/701).
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).
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