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_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAPS. THE FLAPS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (1)  For the bussing plug on the front spar, extend the leading edge flaps (AMM 27-81-00/201).
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (a)  Install flap locks on the leading edge flaps (AMM 27-81-00/201).
 S 864-004
 (2)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P6 Main Power Distribution Panel
 1) EP GND FUELING
 2) QTY

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A
737-300/400/500MAINTENANCE MANUAL
CENTER TANK BUSSING PLUG
SEE A
NO. 2 TANK BUSSING PLUG
SEE A BULKHEAD RECEPTACLE FOR THE FUEL TANK
NO. 1 TANK
BUSSING PLUG

SEE A
BUSSING PLUG
ELECTRICAL CONNECTOR
O-RING SEAL
THIN PLAIN WASHER
SEAL WASHER
BOLT
BULKHEAD (6 LOCATIONS)
RECEPTACLE
FOR THE
FUEL TANK

BUSSING PLUG (FRONT SPAR; ALMOST THE BUSSING PLUG SAME FOR THE REAR SPAR)
A1
ELECTRICAL
CONNECTOR

COUPLING RING
1 AIRPLANES WITH A RECTANGULAR
BUSSING PLUG
BUSSING PLUG
(NO. 1 TANK OR NO. 2 TANK ONLY)
2 AIRPLANES WITH A CIRCULAR A 2 BUSSING PLUG
Tank Unit and Compensator Unit Bussing Plug Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 S 034-005
 CAUTION:_______ DO NOT LEAVE ELECTRICAL POWER ON WITH THE CONNECTOR
 DISCONNECTED.  FUEL QUANTITY UNITS WITH OPEN CIRCUITS MOVE THE
 QUANTITY INDICATOR POINTER AGAINST THE STOP, AND CONTINUOUS
 OPERATION CAN DAMAGE THE INDICATOR CLUTCH.

 (3)  Disconnect the electrical connector from the face of the bussing plug.
 S 024-007
 CAUTION:_______BE CAREFUL WITH THE RECEPTACLE PINS AND SOCKETS. THE RECEPTACLE IS A PART OF THE FUEL TANK WIRING HARNESS ASSEMBLY. IF THERE IS DAMAGE TO THE RECEPTACLE, IT IS NECESSARY TO REMOVE THE FULL HARNESS ASSEMBLY.
 (4)  AIRPLANES WITH A RECTANGULAR BUSSING PLUG; Do these steps:
 (a)  
Remove the six bolts that attach the bussing plug to the bulkhead receptacle.

 (b)  
Discard the plain washers and seal washers.

 (c)  
Carefully remove the bussing plug from the bulkhead receptacle.

 S 024-031
 CAUTION:_______BE CAREFUL WITH THE RECEPTACLE PINS AND SOCKETS. THE RECEPTACLE IS A PART OF THE FUEL TANK WIRING HARNESS ASSEMBLY. IF THERE IS DAMAGE TO THE RECEPTACLE IT IS NECESSARY TO REMOVE THE FULL HARNESS ASSEMBLY.
 (5)  AIRPLANES WITH A CIRCULAR BUSSING PLUG; Do these steps:
 (a)  
Remove the coupling ring and lockwire that attach the bussing plug to the bulkhead receptacle

 (b)  
Carefully remove the bussing plug from the bulkhead receptacle.

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737-300/400/500MAINTENANCE MANUAL
 TASK 28-41-41-404-009
 3.  Bussing Plug Installation_________________________
 A. Consumable Materials
 (1)  
B00316 Solvent-Aliphatic Naphtha TT-N-95

 (2)  
D00250 Petrolatum - VV-P-236

 B. References
 (1)  
AMM 27-81-00/201, Leading Edge Flap and Slat Control
　
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