CONDUIT NUT
ELECTRICAL WING FRONT SPAR CONDUIT
BULKHEAD FITTING
BULKHEAD WIRE BUNDLE UNION RUBBER GROMMET
SEE B
WIRE SPLICE ELECTRICAL WIRES FOR THE FUELING FLOAT SWITCH
FUELING FLOAT SWITCH ELECTRICAL
CONDUIT
FOR THE NO. 2 TANK
NYLON GROMMET
A
CONDUIT NUT
BULKHEAD UNION B
Fueling Float Switch Conduit Figure 601
A00863
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28-21-71
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
(2)
G03200 Tape, lacing or tying - BMS13-54 (or equivalent i.e. string) 75 feet (22.9 meters) minimum, 150 feet (45.7 meters) recommended, to pull the wires through the sleeves and conduit
(3)
Wire - Lockwire or stiff electrical wire, 25 feet (7.6 meters), to pull the wires through the sleeves
C. References
(1)
AMM 28-11-00/801, Integral Fuel Tanks
(2)
AMM 28-21-71/401, Fueling Float Switch
(3)
AIPC 28-22-15-02
(4)
AIPC 28-22-15-03
(5)
SB 28-1132
(6)
SWPM 20-30-12
D. Access
(1)
Location Zones
302 Left Wing Outboard Leading Edge
402 Right Wing Outboard Leading Edge
(2)
Access Panels
7213 Fuel Tank Access Door (Left)
7413 Fuel Tank Access Door (Right)
6223 Slat Access Panel (Left)
6523 Slat Access Panel (Right)
E. Procedure
S 026-023
(1) Remove the fueling float switch from the center fuel tank
(AMM 28-21-71/401).
NOTE: If you plan to re-install the same float switch, then put
____ a mark on the wires where they come out of the conduit (at the front spar). You must make this mark so that you know where you can tie the string to the wires when you pull the wires back in the conduit. There must be no string or tape remaining in the conduit.
NOTE: Cut the float switch wires at the splices shown in the
____ maintenance manual. Keep the float switch wires as long as possible.
NOTE: Attach a strong string to the wires, at the front spar,
____ before you pull them out of the conduit. If you use lacing tape, we recommend that you use two or more strands. It is possible that one piece of lacing tape is too weak.
NOTE: It will be necessary to go into the center fuel tank.
____ Usually, it will not be necessary to go into the number 2 fuel tank.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 216-022
(2) Look carefully at the area of the wire that was installed in the
conduit.
(a) If you find any sign of electrical arcing on the wires, then
you must do one of these two options:
NOTE: Arcing can show as very small blackened holes in the____
insulation, or as deformation or pitting of the copper
wire. Worn areas with a black material around the edge
is not a sign of arcing. The black material is aluminum
oxide.
1) OPTION 1;
Replace the section of the electrical conduit where the
arcing occurred (AIPC 28-22-15-02, AIPC 28-22-15-03).
2) OPTION 2;
Do this task: Center Tank Float Switch Electrical Conduit
Inspection (AMM 28-21-71/601).
S 366-018
(3) If you smell or see fuel on the electrical wires, then you must find
and correct the leak.
(a) If the leak is caused by damage to the conduit, then replace
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