(22)
Close the shutoff handle on the nozzle of the fuel hose.
(23)
Disconnect the nozzle ground cable from the airplane ground jack.
(24)
Disconnect the defueling hose nozzle.
S 862-063
S 092-120
S 092-119
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737-300/400/500MAINTENANCE MANUAL
S 432-064
(25)
Put the cap on the fueling receptacle.
S 412-121
(26)
Close the access door, 6540, for the refuel station (P15 panel).
S 032-065
(27)
Remove the cap from the inlet fuel line for the bypass valve in the No. 2 tank, if you installed it before this step.
(a) Install the bypass valve (AMM 28-22-61/401).
S 412-067
(28)
Install the access panels that you removed before this step (AMM 28-11-11/401).
S 652-069
(29)
If you are scheduled to defuel the tanks completely, do this procedure: "Drain the fuel from the sumps".
K. Defuel through the Pressure Fueling Receptacle With the External Power Control Unit (PCU) for Defueling.
NOTE: You can use this procedure to defuel one tank when it is not
____ necessary to defuel the other tanks. You can use this procedure when it is not possible to operate the boost pumps with the airplane electrical system. With the PCU you can connect the boost pump directly to the ground electrical power. The PCU has cable connections, control switches, and indication lights.
S 862-070
(1)
Ground the airplane and the fuel truck (AMM 20-40-11/201).
S 862-071
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P6 Main Power Distribution Panel
1) TEMP IND
2) QTY
3) ENG NO. 2 (FUEL FLOW INDICATOR)
4) ENG NO. 1 (FUEL FLOW INDICATOR)
5) EP GND FUELING
6) TANK 2 BOOST PUMP FWD
7) TANK 1 BOOST PUMP FWD
8) FUEL SHUTOFF VALVE
9) TANK 2 BOOST PUMP AFT
10) TANK 1 BOOST PUMP AFT
11) CROSSFD VALVE
12) SHUTOFF VALVE ENG 2
13) SHUTOFF VALVE ENG 1
14) CTR TANK BOOST PUMP RIGHT
15) CTR TANK BOOST PUMP LEFT
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737-300/400/500MAINTENANCE MANUAL
16) FUEL CONT NO. 1 AFT NO. 2 FWD CTR L
17) FUEL CONT NO. 1 FWD NO. 2 AFT CTR R
S 012-072
(3) Open the access door, 6540, for the fueling station (Fig. 201).
S 032-119 CAUTION: MAKE SURE THE DEFUELING HOSE NOZZLE HAS A SCREEN TO COLLECT
_______ UNWANTED MATERIAL FROM THE AIRPLANE FUEL TANKS. UNWANTED MATERIAL CAN GET INTO THE FUEL TRUCK.
(4)
Remove the cap on the fueling receptacle. S 492-073
(5)
Connect the defueling hose nozzle to the fueling receptacle. S 862-188
(6)
Open the shutoff handle on the defueling hose. S 012-074
(7)
Open the access door, 6535, for the defueling valve (Fig. 202). S 862-125
(8)
Set the lever that opens the defueling valve to the OPEN position. S 862-075
(9)
If you are scheduled to use the boost pumps in the No. 1 tank or the center tank, open the fuel crossfeed valve with the manual override lever.
S 862-214
WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE
_______ FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU MOVE THE FLAPS. THE FLAPS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(10) To get access to the forward boost pumps in the No. 1 tank or the No. 2 tank, extend the leading edge flaps (AMM 27-81-00/201).
S 492-112 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO
_______ INSTALL THE LE FLAP SAFETY LOCKS. THE LE FLAPS CAN MOVE QUICKLY IF YOU DO NOT INSTALL THE SAFETY LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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