GATE AND ACTUATOR 
HANDLE ASSEMBLY 
PORT ADAPTER 
ASSEMBLY 
GATE 
ASSEMBLY 
HANDLE 

FWD 
A DEFUELING VALVE  INBD 
Defueling Valve Figure 1 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (3)  Port Adapter Assembly
 (a)  The port adapter assembly consists of a housing and a thermal relief valve. The assembly, installed in the fuel tank, supplies the mounting surfaces for the fuel lines and a fuel tight enclosure for the gate assembly. A thermal relief valve vents excessive pressure in the valve body back into the tank.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 DEFUELING - MAINTENANCE PRACTICES
_________________________________
 1.  General_______
 A.  This procedure has these tasks:
 (1)  
A task to defuel the fuel tanks

 (2)  
A task to transfer fuel from one tank to a different tank.

 B.  If the heat exchanger for the hydraulic system is above the surface of the fuel, it can become too hot.
 C.  You can defuel all of the tanks at the same time. You can also defuel only one of the tanks. If you defuel only one tank, make sure the fuel and the fuel gas in the other tanks do not go into the tank you defueled.
 D.  You must carefully do all of these safety precautions:
 (1)  
The safety precautions for defueling in this manual

 (2)  
The safety precautions that the airport tells you to do

 (3)  
The safety precautions that the airline tells you to do.

 E.  If you do not obey these safety precautions, a fire or an accident can easily occur.
 F.  Do not operate an engine driven or electric motor driven pump in the hydraulic system if the No. 1 tank or the No. 2 tank has less than 762 kilograms (1675 pounds) of fuel (AMM 29-15-00/201).
 G.  When thunderstorms or lightning are within a 10 mile (16 kilometer) radius of the immediate area, the defueling procedure should stop.
 H.  Strong wind conditions can cause a build-up of static electricity. Large charges of static electricity can develop on support equipment while parked as a result of the movement of dust particles and air currents during strong wind conditions. Strong wind conditions can also cause the unwanted movement of items or equipment which can hit the airplane or injure persons. Wind gusts can damage the airplane structure. Fueling procedures should stop if strong wind conditions are present.
 TASK 28-23-00-652-013
 2.  Fuel Tank Defueling___________________
 A.  General
 (1)  There are four different procedures that you can use to defuel the fuel tanks:
 (a)  
Defuel through the pressure fueling receptacle with the airplane boost pumps and the defueling (suction) pump on the refuel truck. This procedure defuels all of the tanks at the same time. It is the fastest procedure to defuel the tanks.

 (b)  
Defuel through the pressure fueling receptacle with the airplane boost pumps only.

 (c)  
Defuel through the pressure fueling receptacle with the defueling (suction) pump on the fuel truck only. Use this procedure only if it is necessary. It is a very slow procedure.

 (d)  
Defuel through the pressure fueling receptacle with the external power control unit (PCU). You must have special ground support equipment to do this procedure.

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