S 034-016

 (7)  
Move the retaining plate from the sump drain assembly.

 S 024-017

 (8)  
Remove the sump drain assembly.

 (a)  
Turn the sump drain assembly clockwise to remove it from the sump drain valve.

 (b)  
Lower the sump drain assembly down in a straight line through the valve door opening to remove it.

 (c)  
Remove and discard the two O-rings from the sump drain assembly.

 TASK 28-11-41-404-018
 5. Sump Drain Assembly Installation (Rod-Operated) (Fig. 401)
________________________________
 A. References
 (1)  SWPM 20-20-00, Standard Wiring Practices Manual
 B. Access
 (1)  
Location Zone
 215 Keel Beam

 (2)  
Access Panels
 3303 A/C Access Panel
 3403 A/C Access Panel

 C. Procedure
 S 434-020
 (1)  
Install two new O-rings, lightly lubricated with fuel, on the sump drain assembly.

 S 424-021

 (2)  
Install the drain assembly in the housing.

 (a)  Move the drain assembly up through the access door opening for the sump drain.
 NOTE: You will feel the sump drain assembly when it
____ touches the sump drain valve.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (b)  
Turn the sump drain assembly counterclockwise until it is against the sump drain valve.

 (c)  
Tighten the sump drain assembly with the fitting on the end of the drain tube.

 (d)  
Make sure the rod that operates the valve is on the aft side of the assembly when the assembly is tight.

 S 014-022
 (3)  
Open the access door for the right air conditioning bay to find the ground strap.

 S 434-023

 (4)  
Attach the ground strap to the sump drain assembly.

 S 414-024

 (5)  
Close the access door for the right air conditioning bay.

 S 434-025

 (6)  
Attach the retaining plate to the hexagonal fitting on the sump drain assembly with the lockwire.

 S 434-026

 (7)  
Attach the retaining plate to the drain well structure with the two bolts and the washers that you removed before this step.

 S 284-027

 (8)  
Do a check of the electrical bond between the drain assembly and the structure (SWPM 20-20-00).

 (a)  The resistance must not be more than 0.010 ohms.
 S 714-028
 (9)  
Make sure the valve operates correctly.

 (a)  
Pull the rod that operates the sump drain assembly.

 (b)  
Make sure the rod moves freely when you pull with a maximum force of five to ten pounds.

 (c)  
If the tank contains some fuel, catch the fuel that flows from the sump drain assembly in an applicable container.

 (10)
 Close the access door for the sump drain.

 S 414-029
 TASK 28-11-41-004-030
 6.  Sump Drain Valve Removal (Fig. 401)________________________
 A. References
 (1)  AMM 28-10-00/201, Fuel Storage
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 28-11-41
 ALL  ú ú 01 Page 407 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (2)  AMM 28-11-31/401, Center Tank Access Panel
 B. Access
 (1)  
Location Zone
 221 Center Section Fuel Tank

 (2)  
Access Panels
 3303 A/C Access Panel
 3403 A/C Access Panel

 C. Procedure
 S 654-031
 WARNING: CAREFULLY DO ALL THE SAFETY PROCEDURES TO DEFUEL THE FUEL
_______ TANK AND TO GO INTO THE FUEL TANK. AN EXPLOSION AND BAD INJURY TO PERSONS CAN OCCUR IF YOU DO NOT FOLLOW THE SAFETY PROCEDURES.
　
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