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 ú ú 01.1 Page 608 ú Jul 12/02
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A
737-300/400/500MAINTENANCE MANUAL
 FUEL VENT SYSTEM CHECK VALVE - REMOVAL/INSTALLATION
___________________________________________________
 1. General
_______
 A. This procedure has two tasks:
 (1)  
A task to remove the check valve for the fuel vent system

 (2)  
A task to install the check valve for the fuel vent system.

 TASK 28-13-51-004-001
 2. Fuel Vent System Check Valve Removal (Fig. 401)
____________________________________
 A. References
 (1)  
AMM 28-10-00/201, Fuel Storage

 (2)  
AMM 28-11-31/401, Center Tank Access Panels

 B. Access
 (1)  
Location Zones
 221 Center Section Fuel Tank

 (2)  
Access Panels
 3303 Fuel Tank Access Door
 3403 Fuel Tank Access Door

 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 panel, 3303 or 3403, to get access to the check valve (AMM 28-11-31/401).

 S 024-005

 (3)  
Remove the check valve from the vent tube assembly.

 TASK 28-13-51-404-006
 3. Fuel Vent Drain Valve Installation (Fig. 401).
__________________________________
 A. References
 (1)  AMM 28-11-31/401, Center Tank Access Panels
 B. Access
 (1)  
Location Zones
 221 Center Section Fuel Tank

 (2)  
Access Panels
 3303 Fuel Tank Access Door
 3403 Fuel Tank Access Door

 C. Procedure
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A 737-300/400/500MAINTENANCE MANUAL
RELIEVES TRAPPEDAIR DURING FUELING CHECKVALVE CHECK
VALVES
(EXAMPLE -
2 LOCATIONS) CHECK VALVE CLIMBVENTS SURGE TANK
GRAVITY
DRAIN LINE
CENTER TANK
NO. 1 TANK  NO. 2 TANK
SURGE TANK SURGE TANK CHECKVALVE
Fuel Vent System Check Valve
Figure 401

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F96813
A
737-300/400/500MAINTENANCE MANUAL
 S 654-013
 WARNING: CAREFULLY DO ALL OF THE SAFETY PROCEDURES TO GO INTO THE FUEL
_______ TANK IF YOU ARE NOT CAREFUL, AN EXPLOSION AND INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Go into the applicable fuel tank.

 S 424-008

 (2)  
Install the new packing on the check valve.

 S 424-012

 (3)  
Install the check valve on the vent tube assembly.

 S 214-009

 (4)  
Make sure there is no color identification tape on the components in the fuel tank.

 S 214-010

 (5)  
Make sure the fuel tank is clear of all equipment and unwanted material.

 (6)  
Install the applicable panel, 3303 or 3403 (AMM 28-11-31/401).

 S 414-011
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