(c)
Close the access door for the sump drain valve.
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A 737-300/400/500MAINTENANCE MANUAL
THE CENTER TANK
Sump Drain Valve for the Center Tank
Figure 303 (Sheet 1)
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M50368
A 737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN PANEL IN THE
SUMP DRAIN SLOT-TYPE
VALVE FOR THE CENTER
BLADE TANK
SUMP DRAIN ASSEMBLY CONTAINER
DRAIN TOOL FOR THE CENTER TANK SUMP
RETAINING
PLATE
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 DRAIN TOOL FOR THE(TOOL OPERATED) CENTER TANK SUMP
A
B
Sump Drain Valve for the Center Tank Figure 303 (Sheet 2)
M50374
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DRAIN VALVE ú
ú 01A ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 310Mar 12/02
A
737-300/400/500MAINTENANCE MANUAL
SUMP DRAIN VALVE FLAPPER ASSEMBLY
PANEL IN THE BOTTOM WING SKIN
PLUNGER
TOP HOUSING
VALVE ACTUATING CAM
DRAIN TUBE ASSEMBLY
SUMP DRAIN ASSEMBLY
ACTUATING ROD
ACTUATING ROD
RETAINING PLATE
A
A
DRAIN TUBE
DOOR ACCESS DOORBOTTOM BODY FASTENER
SKIN SEE C
SUMP DRAIN VALVE FOR THE CENTER TANK (ROD-OPERATED)
A
Sump Drain Valve for the Center Tank Figure 303 (Sheet 3)
FWD
SUMP DRAIN
ACCESS DOOR
A-A
SUMP DRAIN
PULL TO DRAIN.
RELEASE TO CLOSE.
VERIFY THAT HANDLE
RETURNS TO CLOSED
POSITION.
ACCESS DOOR
A
M50430
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DRAIN VALVE ú
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ú Mar 12/02
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A
737-300/400/500MAINTENANCE MANUAL
PRESSURE REFUELING - SERVICING
______________________________
1. General_______
A. This procedure has this task:
(1) A task to refuel the airplane with the pressure refuel procedure
B. You can refuel the No. 1 tank and the No. 2 tank with the pressure refuel procedure. You can refuel the center tank with the pressure refuel procedure. You can also move fuel from the other tanks into the center tank with the fuel boost pumps. You must use this procedure to put fuel in the center tank if you used the overwing refuel procedure for the other tanks.
C. It is necessary to have 115-volt ac power to use the boost pumps. Refer to Fig. 301 for the location of the pressure refuel station. Use the pressure refuel procedure when it is possible to use it because it has these properties:
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