TASK 28-25-04-004-001
2. APU Fuel Supply Line Forward of the Rear Spar Removal (Fig. 401)
_____________________________________________________
A. References
(1)
AMM 28-11-00/201, Fuel Tanks
(2)
AMM 28-26-00/201, Defueling
B.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left
(2)
Access Panels
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
131DZ Spanwise Beam Access Door
C.
Procedure
S 654-002
(1) Defuel the center wing tank and the No. 2 main fuel tank (AMM 28-26-00/201).
S 864-003
WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL AND TO GO INTO
_______ THE FUEL TANKS. INJURY TO PERSONS AND TO EQUIPMENT CAN OCCUR IF YOU DO NOT OBEY THE SAFETY PRECAUTIONS.
(2)
If you will remove the fuel line from the No. 2 main tank, purge and go into the tank through access opening, 544AB (AMM 28-11-00/201).
S 864-004
(3)
If you will remove the fuel line from the center wing tank, purge and go into the tank (AMM 28-11-00/201).
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28-25-04
ALL ú ú 01 Page 401 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
S 034-005
(4)
Loosen the coupling nuts on the fuel line.
S 034-006
(5)
Disconnect the bonding jumpers from the fuel line.
NOTE: Keep the jumper clamps for reinstallation.
____
S 034-007
(6)
Disconnect the fuel line clamps from structure.
S 024-008
(7)
Remove the fuel line and the clamps.
S 034-065
(8)
Discard the coupling O-rings.
TASK 28-25-04-404-009
3. APU Fuel Supply Line Forward of the Rear Spar Installation (Fig. 401)
__________________________________________________________
A. Equipment
(1)
Bonding Meter (AMM 20-22-01/601)
B.
Consumable Materials
(1)
B00316 Solvent - Aliphatic Naphtha, TT-N-95, Type I
C.
References
(1)
AIPC 28-25-04, Fig. 1
(2)
AIPC 28-25-04, Fig. 5
(3)
AMM 20-11-15/401, Bonding Jumpers and Ground Leads
(4)
AMM 20-22-01/601, Electrical Bonding
(5)
AMM 28-00-00/201, Fuel System
(6)
AMM 28-11-00/201, Fuel Tanks
D.
Access
(1)
Location Zones 131 Center Section Wing Box, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left
(2)
Access Panels
131AZ Spanwise Beam Access Door
131BZ Spanwise Beam Access Door
131CZ Spanwise Beam Access Door
131DZ Spanwise Beam Access Door
E.
Procedure
(1)
Clean the mounting areas for the fuel line clamps with solvent.
S 114-010
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
28-25-04
ALL ú ú 01 Page 402 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(2) S 424-011Hold the fuel line with the clamps loosely connected to the support brackets or structure with bolts, washers, and nuts.
NOTE:____ Do not tighten.
(3) S 434-012Connect the fuel line couplings (AMM 28-00-00/201).
NOTE:____ Start with the rigid coupling at a fixed point like a bulkhead, valve, or pump fitting. Make sure that the last connection point is a flexible full coupling.
(4) S 434-013Tighten all the bolts that attach the fuel line clamps to the support brackets or the structure.
(5) S 434-014Tighten the support brackets to the structure with bolts, washers, and nuts if the brackets are loose.
(6) S 224-015Make sure that the clearance between the fuel line and the structure is larger than 0.25 inch, except in the immediate area of support. The fuel line must not touch the structure.
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