(2)  
F80048-84 (alternate) - Leading Edge Flap Actuator Locks

 (3)  
Electric test set - ohmmeter/voltmeter, 28 V-DC/115 V-AC

 3.  Prepare for Trouble Shooting____________________________
 A.  Procedure
 (1)  
Make sure each fuel tank contains a minimum of 2000 pounds or 900 kilograms of fuel.

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

 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF THE LE
_______ AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU EXTEND OR RETRACT THE FLAPS. THE FLAPS CAN MOVE QUICKLY WITH THE HYDRAULIC POWER REMOVED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Extend the leading edge flaps (AMM 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.
 (4)  
Install the leading edge flap locks (AMM 27-81-00/201)

 (5)  
Make sure the manual defueling valve is closed.

 (6)  
Make sure the APU master switch on the P5 panel is in the OFF position.

 (7)  
Make sure all fuel boost pump switches on the P5 panel are in the OFF position.

 (8)  
Make sure the crossfeed valve switch, on the P5 panel, is in the CLOSED position.

 (9)  
Make sure the engine fire switches on the P8 panel are in the NORMAL (non-fire) position (switches full-in).

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A 737-300/400/500MAINTENANCE MANUAL
 WARNING: IF ONE OF THE 115 VAC BOOST PUMP CIRCUIT BREAKERS IS OPEN, DO
_______ THE STEPS IN FIGURE 101 TO FIND THE PROBLEM. DO NOT CLOSE THE CIRCUIT BREAKER WITHOUT DOING THESE STEPS. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
 (10)
 Make sure these circuit breakers are closed:

 (a)  On the main power distribution panel, P6:
 1) SHUTOFF VALVE ENG 1
 2) SHUTOFF VALVE ENG 2
 3) BOOST PUMP TANK 1 FWD
 4) BOOST PUMP TANK 2 FWD
 5) BOOST PUMP TANK 1 AFT
 6) BOOST PUMP TANK 2 AFT
 7) BOOST PUMP CTR TANK LEFT
 8) BOOST PUMP CTR TANK RIGHT
 9) CROSSFEED VALVE
 10) PANEL & INSTRUMENT 28 V
 11) MASTER CAUTION ANNUNCIATOR NO. 1
 12) MASTER CAUTION ANNUNCIATOR BAT
 13) DIM & TEST

 (11)
 Make sure the engine start levers on the aisle stand are in the CUT-OFF position.

 (12)
 Set the BAT switch on the P5 panel to ON.

 (13)
 Operate the master dim and test circuits and push the indicator lights to make sure the fuel-feed system lights operate correctly.

 NOTE: The indicator lights are "Press-to-test".
____
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A 737-300/400/500MAINTENANCE MANUAL

Troubleshooting for the Engine Fuel-Feed System
Figure 101 (Sheet 1)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

OK

Troubleshooting for the Engine Fuel-Feed System
Figure 101 (Sheet 2)
　
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