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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 TASK 28-23-00-872-211
 4.  Fuel Transfer to Remove Air Pockets in the Engine Fuel-Feed Line Adjacent to____________________________________________________________________________ the Defueling Valve___________________
 A.  General
 (1)  Do this procedure if the No. 2 tank was emptied and the engine fuel-feed line was disconnected in any location from the No. 2 engine fuel shutoff valve (spar valve) to the crossfeed valve. It is possible for air to become trapped in the part of the fuel-feed line adjacent to the defueling valve. This can cause problems if the No. 2 engine operates with suction fuel feed.
 B.  References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 49-11-00/201, APU Power Plant

 C.  Access
 (1)  
Location Zones
 101 Control Cabin Left
 102 Control Cabin Right

 (2)  
Access Panels
 6535 Defueling Access Panel
 6540 Refueling Station Access Panel

 D.  Procedure
 S 862-190
 (1)  
Make sure there is a minimum of 1000 pounds (500 kgs) in the No. 2 tank.

 S 862-191

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

 NOTE:____You can also supply power with the APU. Do a check for minimum fuel quantities and other data before you start the APU.
 S 862-192
 (3)  
Make sure all of the circuit breakers for the fuel system on the P6 panel are closed.

 S 862-193

 (4)
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Main Power Distribution Panel
 1) ENG 1 R IGN
 2) ENG 1 L IGN
 3) ENG 2 R IGN
 4) ENG 2 L IGN

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737-300/400/500MAINTENANCE MANUAL
 (5)  S 862-194Make sure the crossfeed valve switch is in the CLOSE position.
 (6)  S 012-195Open the access door, 6540, for the refuel station (Fig. 201).
 (7)  S 712-197Set the fueling valve switches to OPEN to make sure the valve position lights operate correctly.
 (8)  S 862-198Leave the fueling valve switch for the No. 1 tank open.
 (9)  S 862-199Set the fueling valve switches for the No. 2 tank and the center tank to CLOSE.
 S 012-200

 (10) Open the access door, 6535, for the defueling valve.
 (a)  Set the defueling valve handle to OPEN.
 S 872-212
 (11) On the P5 panel, set these switches for the fuel boost pumps to ON:
 (a)  
FUEL PUMPS FWD 2

 (b)  
FUEL PUMPS AFT 2

 S 872-213
 (12)
 Monitor the fuel quantities in the No. 1 tank and the No. 2 tank until the fuel quantity in the No. 2 tank decreases by 500 pounds (240 kgs) and the fuel quantity in the No. 1 tank increases by 500 pounds (240 kgs).

 S 862-203

 (13)
 On the P5 panel, set these switches for the fuel boost pumps to OFF:

 (a)  
FUEL PUMPS FWD 2

 (b)  
FUEL PUMPS AFT 2

 S 862-204
 (14)
 If it is necessary, do this procedure:  "Fuel Transfer from One Tank to a Different Tank" to set the fuel load to its correct configuration.

 S 862-205

 (15)
 Set all of the fueling valve switches to the CLOSE position on the refuel panel (P15).

 (16)
 Close the access door, 6340, for the refuel station.

 S 412-206
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