NOT OK
OK
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù.
AIRPLANES WITH FUEL FLOW INDICATOR/CHECK ú 28-15-00
VALVE ú
ú 02 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 102Nov 15/92
A
737-300/400/500MAINTENANCE MANUAL
3. Troubleshoot Center Tank Fuel Scavenge System
Do this procedure: "Prepare for Troubleshooting". Make sure the switch for the FWD boost pump in the No. 1 tank is in the ON position. Monitor the indicators to make sure fuel does not flow from the center tank to the No. 1 tank (the two indi-cator values must not change).
NOT OK
OK
NOT OK
OK
B07314
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FUEL CONTINUES TO FLOW FROM THE CENTER TANK TO THE NO. 1
NOT OK
TANK - Replace the engine accessory unit, M528 (AMM 20-10-07/201).
OK
The center tank fuel scavenge system operates correctly.
B07333
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28-15-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 1
B07336
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VALVE ú
ú 01 Page 105
ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
PROCEDURE 1
B07340
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
(2) AIRPLANES WITH THE FUEL FLOW INDICATOR/CHECK VALVE; Extend the leading edge flaps (Ref 27-81-00/201).
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.
(3)
AIRPLANES WITH THE FUEL FLOW INDICATOR/CHECK VALVE; Install the locks on the leading edge flaps (Ref 27-81-00/201).
(4)
Make sure the engine start levers on the aisle stand are in the CUTOFF position.
(5)
Make sure the fuel quantity in tank No. 1 is between 10 and 80% full and that the center tank is more than 10% full.
(6)
AIRPLANES WITH THE FUEL FLOW INDICATOR/CHECK VALVE; at the front spar of the No. 1 tank, remove the cap from the fuel flow indicator.
(7)
AIRPLANES WITH THE FUEL FLOW INDICATOR/CHECK VALVE; Set the FWD boost pump switch for the No. 1 tank to ON.
(a) Make sure the fuel scavenge flow indicator/check valve needle is in the blue band.
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28-15-00
ALL ú ú 01 Page 107 ú Nov 15/92
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