737 AMM 飞机维护手册 燃油 FUEL(91)

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K.  Prior to splicing float switch wires, perform continuity check of float switch using ohmmeter outside of fuel tank at front spar bulkhead fitting location. Continuity shall not exist between electrical wires of float switch when switch fuel float is raised manually to simulate a full tank.
L.  Connect float switch wires to matching airplane wires using moisture-proof splices (Detail C, Fig. 401).
M.  Install wire clamps as necessary and secure wires to existing wire bundle forward of front spar. Ensure that there is no interference with forward wing flap travel.
6.  AIRPLANES WITH TYPE II FLOAT SWITCH; Remove the Fueling Float Switch (Fig. 402, Fig. 403)
A.  Tank No. 1 or No. 2 Fueling Float Switch and Conduit Removal (Type II) (Fig. 402)
(1)  
Prepare to cut the wires that go the float switch.

(a)  
From out of the fuel tank, separate the wires that go to float switch from the wire bundle, forward of the wing front spar.

(b)  
Find the splice in the wires that go to the float switch.

 

(2)  
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.

 

(3)  
Do these steps to remove the float switch conduit:

NOTE:  It is necessary to remove the conduit each time you remove the float switch.
(a)  
Loosen and remove the coupling ring (17) to permit the float switch cable to move freely.

(b)  
With one person in the tank and one person out of the tank, loosen and remove the bolts (16), nuts (14), washers (24, 26, 27) and packings (25) that attach the retainer (22).

NOTE:  This step protects the retainer (22) from damage while you loosen the conduit mounting nut (18).

(c)  
Pull the retainer back from the front spar.

(d)  
From out of the fuel tank, loosen the bulkhead conduit mounting nut (18).

(e)  
From in the fuel tank, loose and remove the conduit captive nut (15).

(f)  
Disconnect the bonding jumper (2) from the ground stud of the float switch.

(g)  
Disconnect the bonding jumper (5) from the conduit (7).

(h)  
Loosen the mounting nut (3) for the float switch.

(i)  
Separate the float switch from the conduit and from the conduit liner sufficiently to remove the float switch and conduit from the bracket.

(j)  
Disengage the conduit from the bulkhead.

(k)  
Pull the remaining wiring through the bulkhead and remove the float switch and the conduit from the tank as a unit.

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28-21-71 Page 408  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

A.  Center Tank Fueling Float Switch Removal (Type II) (Fig. 403)
(1)  
Prepare to cut the wires that go the float switch.

(a)  
From out of the fuel tank, separate the wires that go to float switch from the wire bundle, forward of the wing front spar.

(b)  
Find the splice in the wires that go to the float switch.

 

(2)  
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.

(c)  
Loosen and remove the drain port (35) to permit the float switch cable to move freely.

 

(3)  
Do these steps to remove the float switch conduit:

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.
(a)  
Loosen the mounting nut (42) from the float switch.

(b)  
Hold the float switch with its attaching parts and do not let it fall while you pull the wires for the float switch out of the conduit.

(c)  
Make loops in the wire make the wire and float switch easy to move.

(4)  Remove the float switch from the fuel tank.
(a)  
From out of the fuel tank, pull the formed section of the conduit liner forward out of the conduit with needle-nosed pliers or a similar tool.

(b)  
Cut off the formed end of the conduit liner.

NOTE:  This step makes is easier to pull the conduit liner out of the conduit from inside the tank.

(c)  
From in the tank, pull the conduit liner out of the conduit from the end that was attached to the float switch.

(d)  
Remove the conduit liner from the fuel tank.
1) Discard the liner.

 

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