S 412-208

 (18)
 Close the access door, 6535, for the defueling valve.

 S 862-209

 (19)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  P6 Main Power Distribution Panel
 1) ENG 1 R IGN
 2) ENG 1 L IGN
 3) ENG 2 R IGN
 4) ENG 2 L IGN

 S 862-210
 (20) Remove the electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
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A
737-300/400/500MAINTENANCE MANUAL
 DEFUELING VALVE - REMOVAL/INSTALLATION
______________________________________
 1.  General
_______
 A.  This procedure has four tasks:
 (1)  
The removal of the defueling valve gate and actuator handle assembly

 (2)  
The installation of the defueling valve gate and actuator handle assembly

 (3)  
The removal of the port adapter assembly

 (4)  
The installation of the port adapter assembly.

 B.  The defueling valve has these three primary assemblies:
 (1)  
The actuator handle assembly

 (2)  
The gate assembly

 (3)  
The port adapter assembly.

 C.  You remove the gate assembly and the actuator handle assembly as an assembled unit (referred to as the gate and actuator handle assembly).
 D.  The No. 2 tank must contain less than 5360 pounds of fuel to remove the gate and actuator handle assembly.
 E.  You must fully defuel the No. 2 tank to remove the port adapter assembly.
 TASK 28-23-11-014-001
 2.  Defueling Valve Gate and Actuator Handle Assembly Removal (Fig 401)
_________________________________________________________
 A.  Equipment
 (1)  Container - To hold residual fuel from fuel manifold
 B.  Access
 (1)  
Location Zones
 303 Left Wing Inboard Leading Edge
 305 Left Fuel Tank
 403 Right Wing Inboard Leading Edge
 405 Right Fuel Tank

 (2)  
Access Panels
 6535 Defueling Access Panel

 C.  Procedure
 S 014-036
 (1)  Open the access door, 6535, for the defueling valve.
 NOTE: The access door is on the forward side of the front spar
____ and on the outboard side of the No. 2 engine.
 S 864-003
 (2)
Make sure the fuel shutoff valve for the No. 2 engine is closed.

 (a)  Make sure the fire switch is in the FIRE position or the engine start lever is in the CUTOFF position.

 (3)  
Make sure the crossfeed manifold valve is closed.

 S 864-004
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A
737-300/400/500MAINTENANCE MANUAL
ENGINE
NO. 2
SEE A
FITTING FOR THE FUEL FEED LINE FOR ENGINE NO. 2
PORT ADAPTER ASSEMBLY
O-RING (EXAMPLE)
GATE AND ACTUATOR HANDLE ASSEMBLY
WING FRONT SPAR
HANDLE
BOLTS FOR THE
PORT ADAPTER
ASSEMBLY

NUTS FOR THE GATE AND ACTUATOR HANDLE ASSEMBLY
A

Defueling Valve Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 S 864-005
 (4)  
　
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