28-23-00
ALL ú ú 07 Page 231 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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