NECESSARY
SLOT POSITION TO BE FORE LENGTH)& AFT FOR CLOSED & LOCKED
BAC27DFS0054 SUMP DRAIN TOOL FOR THE CENTER TANK (ALTERNATIVE)

A
Sump Drain Valves and Drain Tools
Figure 203 (Sheet 2)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH DRAIN TOOL ú

 28-23-00
 ACTUATED SUMP DRAIN VALVE  ú ú 01 Page 212 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL 
SUMP DRAIN VALVE  FLAPPER ASSEMBLY 
SKIN PANEL LOWER WING 
PLUNGER 
UPPER HOUSING 
CAM VALVE ACTUATING 
ASSEMBLY DRAIN TUBE  SUMP DRAIN  FWD 

SUMP DRAIN ASSEMBLY
ACTUATING ROD
ACTUATING
ROD

RETAINING
PLATE

B
B
DRAIN TUBE
DOOR ACCESSLOWER BODY FASTENER DOORSKIN
CENTER FUEL TANK SUMP DRAIN VALVE (NO DRAIN TOOLS ARE NECESSARY)
Sump Drain Valves and Drain Tools Figure 203 (Sheet 3)
ACCESS DOOR
SEE B
B-B
SUMP DRAIN
PULL TO DRAIN.
RELEASE TO CLOSE. VERIFY THAT HANDLE RETURNS TO CLOSED POSITION.
ACCESS DOOR
B

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH ROD ACTUATED SUMP ú

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 DRAIN VALVE  ú
 ú  01  Page 213
 ú  Nov 15/91 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 682-040
 (2)  Open the drain valves for the boost pumps.
 (a)  Drain the fuel from the pumps.
 S 682-041
 (3)  Close the drain valves for the boost pumps.
 S 682-042
 WARNING: MAKE SURE YOU FULLY DRAINED THE SUMP FUEL WITH THE
_______ AIRPLANE IN THE CORRECT ATTITUDE BEFORE YOU GO INTO THE CENTER TANK. UNWANTED FUEL WILL COME OUT OF THE TANK WHEN YOU REMOVE THE ACCESS PANEL.
 (4)  If you are scheduled to go into the tank that you defueled, do this task: "Purging (Air Ventilating)" for the applicable tank (AMM 28-10-00/201).
 I.  Defuel through Pressure Fueling Receptacle With the Airplane Boost Pump Only
 S 862-043
 (1)  
Ground the airplane and the fuel truck (AMM 20-40-11/201).

 S 862-153

 (2)
Connect the electrical power to the airplane (AMM 24-22-00/201).

 NOTE: If you are not scheduled to defuel the No. 1 tank fully,
____ you can use the APU to supply electrical power. You must have a minimum quantity of fuel in the No. 1 tank to use the APU (AMM 49-11-00/201).
 S 862-154
 (3)  
Make sure all circuit breakers for the fuel system on the P6 panel are closed.

 (4)
Open the access door, 6540, for the refuel station (P15 panel).

 (5)  
Remove the cap on the fueling receptacle.

 S 492-158

 (6)  
Connect the bonding cable on the defueling hose to the ground jack on the wing.

 S 012-156
 S 032-157
 NOTE: The bonding cable is not necessary if there is electrical
____ continuity between the nozzle and the receptacle.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 09 Page 214 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 492-159
 (7)  Connect defueling hose nozzle to the fueling receptacle.
 S 862-160
 (8)  Open the shutoff handle on the defueling hose nozzle.
 NOTE:____ The defueling nozzle must have a filter screen.

 S 862-161
 (9)  
Make sure the two engine shutoff valves are closed.

 S 862-162

 (10)
 Make sure the switches for the fueling shutoff valves on the P15 panel are in the CLOSED position.
　
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