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Rib and Beam Access Openings (Fig. 2)
____________________________
 A.  Access to some equipment in the fuel tanks is not directly posssible through the access panels. For the wing tanks, rib access openings are supplied for the areas either side of access panel No. 1. For the center tank, spanwise beam access openings are supplied for access to aft cavities.
Overwing Fill Ports (Fig. 3)
___________________
 A.  An overwing fill port is supplied for No. 1 and No. 2 tanks. Each port is found on the upper wing surface. The ports permit an alternate way of fueling the wing tanks if pressure fueling equipment is not available.
 B.  Each overwing fill port contains an adapter, seal ring, two O-rings, a retaining nut, and a quick release filler cap. Lift and turn the handle on the filler cap in the counter-clockwise direction to unlock the filler cap. It is then lifted from the adapter. Installation reverses the procedure and the downward turn of the handle locks and seals the filler cap against the adapter.
Fuel Sump Drain Valves (Fig. 4)
______________________
 A.  Fuel sump drain valves are installed at the low points of the fuel and surge tanks to drain accumulated moisture or to drain trapped fuel remaining after defueling.
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 ALL  ú ú 02 Page 4 ú Mar 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
737-300/400/500MAINTENANCE MANUAL 
OVERWING 
FILL PORT 
SEE  A 
OVERWING FILL PORT 
SEE  A 
FILLER CAP 
HANDLE 
LANYARD 
ADAPTER 
O-RINGS 
RETAINING NUT 
SEAL RING 
OVERWING FILL PORT 
A 
Overwing Fill Ports 
Figure 3 

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 ALL  ú ú 01 Page 5 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN VALVE FOR THE SURGE TANK
SEE A
SUMP DRAIN VALVE FOR THE NO. 2 TANK
SUMP DRAIN VALVE SEE BFOR THE SURGE TANK
SEE A
SUMP DRAIN VALVE
FOR THE NO. 1 TANK

SUMP DRAIN VALVE SEE B FOR THE CENTER TANK
SEE C
VALVE BODY
FLAPPER
VALVE

VALVE BODY GUIDE SCREEN
PIN
IN THE SURGE TANK JAMNUTO-RING SCREEN SPRING
POPPET
WING LOWER SKIN VALVE
SUMP DRAIN VALVE FOR THE SURGE TANK SUMP DRAIN VALVE FOR THE NO. 1 AND NO. 2 TANK
A B
Fuel Sump Drain Valve
Figure 4 (Sheet 1)

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 ALL  ú ú 01 Page 6 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

737-300/400/500
MAINTENANCE MANUAL

SUMP DRAIN
LOWER WING
SUMP DRAIN ASSEMBLY

SUMP DRAIN
TURN & PUSH TO DRAIN
RELEASE TO CLOSE
SLOT POSITION TO BE FORE
& AFT FOR CLOSED & LOCKED

SUMP DRAIN VALVE
FOR THE CENTER TANK

 

Fuel Sump Drain Valve
Figure 4 (Sheet 2)

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 28-11-00
 DRAIN VALVE IN THE CENTER TANK  ú ú 02 Page 7 ú Nov 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
FLAPPER VALVE SUMP DRAIN ASSEMBLY
LOWER WING
SKIN PANEL

PLUNGER
UPPER HOUSING
VALVE ACTUATING CAM
DRAIN TUBE ASSEMBLY
SUMP DRAIN ASSEMBLY
ACTUATING ROD
ACTUATING
ROD

RETAINING
　
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