SEE D
A
Fueling Float Switch Installation Figure 401 (Sheet 1)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
SPANWISE BEAM NO. 2
TANK CAVITY N0. 2
ELECTRICAL CONDUIT
BONDING JUMPER
FUELING FLOAT SWITCH
SEE E
FOR CONDUIT CONTINUATION
SEE B CONDUIT MOUNTING UNION BRACKET
FOR CONDUIT ACCESS
CONTINUATION OPENING ELECTRICAL SEE C CONDUIT
CONDUIT SPANWISE UNION
BEAM NO. 1
FWD
70.85 WING RIB
B
WING FRONT SPAR
BULKHEAD FITTING
BULKHEAD FITTING RUBBER GROMMET
SEE  D 
WIRE SPLICE  1 
WIRE  ELECTRICAL WIRES 
SEE  F  BUNDLE  FOR THE FUELING 
FLOAT SWITCH 
WING FRONT SPAR  INBD  ELECTRICAL 
CONDUIT 
NYLON GROMMET 

FWD C CONDUIT NUT
BULKHEAD UNION
1 INSTALLED ON THE CONDUITS  D
FOR THE WING TANKS ONLY
Fueling Float Switch Installation Figure 401 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

FLOAT SWITCH
WASHER
ELECTRICAL
WIRES

MOUNTING BRACKET
WASHER
MOUNTING
NUT TIE CORD INNER LAYER
CONDUIT
NUT OUTER LAYER OF TAPE
CONDUIT

E

1 INCH MINIMUM

Fueling Float Switch Installation
Figure 401 (Sheet 3)

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A
737-300/400/500MAINTENANCE MANUAL
 S 034-008
 (7)  Prepare to cut the wires that go to the float switch (Fig. 401). (a) Go out of the fuel tank. (b) To get access to the wing tank float switch wires at the front spar, remove the slat access panel No. 6223 (Right) or No. 6523 (Left). (c) Separate the wires that go to the float switch from the wire bundle, forward of the wing front spar. (d) Find the splice in the wires that go to the float switch.
 S 034-009
 (8)  Cut the wires at a good point adjacent to the splice. (a) Make sure the wire has a sufficient length for a new splice. (b) Put a tag on the wires to identify them.
 S 034-010
 (9)  If the wire does not move freely through the conduit, remove the conduit nut, the nylon grommet, and the rubber grommet (if it is installed) from the fitting on the wing front spar (Fig. 401).
 S 034-011

 (10) Go into the fuel tank and remove the conduit nut at the bottom of the float switch.
 S 024-012
 CAUTION: IN THE CENTER TANK, DO NOT LET THE TOOLS OR THE TANK COMPONENTS
_______ FALL. DAMAGE TO THE FUEL CELL OR THE BOTTOM SKIN CAN EASILY OCCUR.
 (11) Remove the float switch.
 (a)  
Disengage the mounting nut for the float switch.

 (b)  
Lift the switch up from the bracket.

 (c)  
Move the switch out to the side of the bracket to let the wires go through the hole in the bracket.

 NOTE: It is possible that the conduit is filled with
____ grease to prevent damage from water.
 (d)  
Install the nut and the washers loosely in the bracket again.

 (e)  
Hold the float switch and do not let it fall while you pull the wires for the float switch out of the conduit.

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