S 862-163
(11)
Make sure the valve position lights are off.
S 972-164
(12)
Make sure you know the correct quantity of fuel in the tanks.
(a)
Write the fuel quantity for the tank or the tanks that you are scheduled to defuel.
(b)
Hold the test switch on the P15 panel in the TEST GAGES position for one second.
(c)
The valve shown on the indicator must decrease.
(d)
Release the switch.
(e)
Make sure the indicator goes back to its initial valve with these tolerance: 1) AIRPLANES WITH ANALOG INDICATORS;
| 50 pounds (| 25 kilograms) 2) AIRPLANES WITH DIGITAL INDICATORS; | 10 pounds (| 10 kilograms).
S 012-165
(13)
Open the valve access door, 6535, for the defueling (Fig. 202).
S 862-166
(14)
Open the defueling valve.
S 862-167
(15)
Set the crossfeed valve control on the P5 panel to open the crossfeed valve.
NOTE: If you are scheduled to defuel the No. 2 tank (right side),
____ it is not necessary to open or to close the crossfeed valve.
(a) Make sure the valve position light is dim (blue).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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737-300/400/500MAINTENANCE MANUAL
S 862-220
(16) On the P5 panel, set the switches for the fuel boost pumps to the positions shown in this table:
~............................................................................... | | SWITCH POSITION FOR DEFUELING | | .......................................... | FUEL BOOST PUMP SWITCH | TANK NO. 1 | TANK NO. 2 | CENTER TANK | .................................................................................
| FUEL PUMPS AFT 1 | ON | OFF | OFF |
| FUEL PUMPS FWD 1 | ON | OFF | OFF |
| FUEL PUMPS AFT 2 | OFF | ON | OFF |
| FUEL PUMPS FWD 2 | OFF | ON | OFF |
| FUEL PUMPS L CTR | OFF | OFF | ON |
| FUEL PUMPS R CTR | OFF | OFF | ON |
2......................................…............…............…..............1
(a) To operate the fuel boost pumps in the center tank, you must be in the flight compartment to continuously monitor for the LOW PRESSURE lights. 1) Turn the applicable fuel boost pump switch for the center
tank to the OFF position if the LOW PRESSURE light stays on.
S 652-169
(17)
Defuel the applicable tank until the fuel quantity indicator shows the specified quantity of fuel in the tank.
S 862-170
(18)
Close the crossfeed valve with the applicable switch on the P5 panel.
S 862-171
(19)
Close the defueling valve.
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737-300/400/500MAINTENANCE MANUAL
S 862-172
(20)
Close the fuel shutoff handle on the hose nozzle.
S 862-173
(21)
Put the cap on the fueling receptacle.
S 862-174
(22)
Remove the electrical power if it is not necessary for other tasks (AMM 24-22-00/201).
S 682-111
(23)
Do this procedure: "Sump Drain Procedure".
J. Defuel through Pressure Fueling Receptacles With the Fuel Truck Defueling (Suction) Pump Only
NOTE:____This defueling procedure is very slow. Use it only when you cannot use electrical power on the airplane. The defueling nozzle must have a filter screen. You can defuel the No. 1 tank and the No. 2 tank fully or to a specified level. But you must defuel the center tank fully when you use this procedure. If you are scheduled to defuel the No. 1 tank or the center tank , you must defuel the No. 2 tank. You must then do the purging and entry procedure.
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