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A
737-300/400/500MAINTENANCE MANUAL
 S 014-035
 (6)  AIRPLANES WITH THE CIRCULAR BUSSING PLUG ON THE NO. 1 AND NO. 2
 TANK;
 Do these steps:
 (a) To replace the wire harness in the No. 1 or No. 2 tank, remove
 the bussing plug for that tank (AMM 28-41-41/401).
 (b) To replace the wire harness in the center tank, disconnect the
 electrical connector for the center tank (Fig. 401).
 S 014-007
 (7)  Go into the applicable fuel tank with the replacement wire harness
 (AMM 28-41-21/401, Fig. 401 and AMM 28-11-11/401).
 S 164-008
 (8)  Remove the sealant around the edge of the wire bundle connection
 with the receptacle on the spar if there is some sealant.
 S 024-009
 (9)  Remove the receptacle.
 NOTE: Two persons are necessary to do this task.____
 (a) One person must go into the tank and hold the receptacle up.
 (b) A second person must get access to the receptacle from the
 outer surface of the tank.
 (c) AIRPLANES WITH THE RECTANGULAR BUSSING PLUG;
 The person out of the tank must remove the six mounting screws
 that attach the receptacle to the bulkhead.
 (d) AIRPLANES WITH THE CIRCULAR BUSSING PLUG ON THE NO. 1 AND THE
 NO. 2 TANK;
 The person out of the tank must remove the lockwire, the nut,
 and the washer that attach the receptacle to the bulkhead.
 (e) The person in the tank must pull the receptacle away from the
 bulkhead.
 S 164-010

 (10) Prepare to install the new receptacle.

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A 737-300/400/500MAINTENANCE MANUAL
CENTER TANK
BUSSING PLUG

SEE A
BULKHEAD (SPAR) WASHER TANK NO. 2 SEALANT BUSSING PLUG
RECEPTACLE
SEE A
RECEPTACLE NUT
TANK NO. 1 BUSSING PLUG
BUSSING PLUG

SEE A FUEL TANK LOCKWIRE BULKHEAD
FUEL QUANTITY RECEPTACLE
INDICATING SYSTEM
ELECTRICAL CONNECTOR COUPLING RING
BUSSING PLUG (TANK NO. 1 OR TANK NO. 2 ONLY)
BULKHEAD (SPAR)
A1
SEALANT
BUSSING PLUG
FUEL TANK FUEL QUANTITY
BULKHEAD (SPAR) INDICATING SYSTEM
RECEPTACLE ELECTRICAL CONNECTOR RECEPTACLE MOUNT SCREW (6 LOCATIONS) 1
AIRPLANES WITH
CIRCULAR BUSSING PLUG

(EXAMPLE FOR FRONT SPAR,
ON TANK NO. 1 OR TANK
NO. 2

EQUIVALENT FOR REAR SPAR)
2
AIRPLANES WITH
A2
RECTANGULAR BUSSING PLUG
Bussing Plug Locations
Figure 401 (Sheet 1)

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A 737-300/400/500MAINTENANCE MANUAL
LOCKWIRE

Bussing Plug Locations
Figure 401 (Sheet 2)

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L56256
A 737-300/400/500MAINTENANCE MANUAL
 (a)  
Clean these surfaces with a clean lintfree cloth moist with the solvent: 1) The area on the bulkhead where you will install the

 receptacle 2) The surface of the new receptacle that will be against the bulkhead 3) The O-ring groove on the new receptacle.

 (b)  
Install a new O-ring.

 S 424-011
 (11) Install the new receptacle.
 (a)  
Put the receptacle in its correct position in the bulkhead (spar).

 (b)  
　
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