B. Access
 (1)  
Location Zones
 305 Left Wing Fuel Tank
 405 Right Wing Fuel Tank

 (2)  
Access Panels
 Left No. 4 Fuel Tank Access Panel
 Left No. 8 Fuel Tank Access Panel
 Right No. 4 Fuel Tank Access Panel
 Right No. 8 Fuel Tank Access Panel

 C. Procedure
 S 654-002
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO DEFUEL THE FUEL
_______ TANK AND TO PREPARE TO GO INTO IT. AN EXPLOSION, BAD INJURY TO PERSONS, AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)
Prepare the applicable fuel tank for entry (AMM 28-10-00/201).

 S 014-003

 (2)  
Remove the applicable left or right fuel tank access panels, No. 4 and No. 8, to get access to the check valve (AMM 28-11-11/401).

 (3)  
Remove the fasteners from the baffle check valve and tank structure.

 (4)
Remove the baffle check valve from the fuel tank (Fig. 401).

 S 024-010
 S 024-004
 TASK 28-11-81-404-005
 3. Fuel Tank Baffle Check Valve Installation (Fig. 401)
_________________________________________
 A. References
 (1)  AMM 28-11-11/401, Wing Fuel Tank Access Panels
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 28-11-81
 ALL  ú ú 01 Page 402 ú Mar 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  
Location Zones
 305 Left Wing Fuel Tank
 405 Right Wing Fuel Tank

 (2)  
Access Panels
 Left No. 4 Fuel Tank Access Panel
 Left No. 8 Fuel Tank Access Panel
 Right No. 4 Fuel Tank Access Panel
 Right No. 8 Fuel Tank Access Panel

 C. Procedure
 S 654-012
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES FOR FUEL TANK ENTRY.
_______ IF YOU DO NOT FOLLOW THE SAFETY PROCEDURES, AN EXPLOSION AND INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Go into the applicable fuel tank.

 S 414-011

 (2)  
Install the new baffle check valve to the tank structure with new fasteners (Fig. 401).

 S 214-007

 (3)  
Make sure there is no color identification tape on the components in the fuel tank.

 (4)  
Make sure the tank is clear of all equipment and unwanted materials.

 S 414-009

 (5)  
Install the applicable left or right fuel tank access panels, No. 4 and No. 8 (AMM 28-11-11/401).

 S 214-008
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 28-11-81
 ALL  ú ú 01 Page 403 ú Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 FUEL VENT SYSTEM - DESCRIPTION AND OPERATION
____________________________________________
General (Fig. 1)
_______
 A.  Air and fuel vapors flow in and out of the fuel tanks through the fuel vent system. This prevents excess pressure or vacuum from developing within the fuel tanks. Two parallel vent channels extend into the main and center tanks from the surge tanks. Two stringers attached to the wing upper skin form each hat section channel. The channels open into each surge tank. The aft channel terminates near the wing root in the wing tanks and is connected to a vent tube. The forward channel passes through the center tank and forms a continuous channel connecting the left and right surge tanks. The center tank is vented by tubing runs connected to the forward channel in cavity No. 2.
 B.  A vent tube is mounted to the inboard channel in tanks No. 1 and 2. In the center tank, venting tubing is mounted to the forward channel at two places. The vent tubes provide venting when the float valves open. Two drain check valves are installed in the center tank vent tubing to drain the tubing/channel/surge tanks.
 C.  A surge tank, located at the end of each wing, collects any overflow fuel passed through the vent channels. The overflow fuel will flow through a surge tank drain line into the center tank vent channel and into the center tank. A vent scoop on the wing lower surface creates a positive pressure during flight.
　
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