2.  Equipment and Materials
A.  Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
B.  Electric test set - ohmmeter/voltmeter, 28 V-DC/115 V-AC
3.  Prepare for Trouble Shooting
A.  Ensure each fuel tank contains at least 700 pounds or 350 kilograms of fuel.
B.  Connect external electric power to airplane (Ref 24-22-0 MP).
WARNING:  MAKE SURE PERSONS AND EQUIPMENT ARE CLEAR OF THE LE AND TE FLAPS AND FLAP DRIVE MECHANISMS BEFORE YOU EXTEND OF RETRACT THE FLAPS. THE FLAPS CAN MOVE QUICKLY WITH THE HYDRAULIC POWER REMOVED. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
C.  Extend flaps and install leading edge flap locks (Ref 27-81-0 MP).
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.
D.  Ensure manual defueling valve is closed.
E.  Ensure APU master switch, on forward overhead panel (P5) is in OFF position.
F.  Ensure all fuel boost pump switches, on forward overhead panel (P5), are in OFF position.
G.  Ensure crossfeed valve switch, on P5 panel, is in CLOSED position.
H.  Ensure engine fire switches on aft electronic panel (P8) are in NORMAL (non-fire) position (switches full-in).
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.
I.  Close fuel system circuit breakers on circuit breaker P6 panel: SHUTOFF VALVE ENG 1; SHUTOFF VALVE ENG 2; boost pump (6 circuit breakers); MANIF VALVE (crossfeed valve); PANEL & INSTRUMENT 28 V; MASTER CAUTION ANNUNCIATOR (2 circuit breakers); DIM & TEST.
J.  Ensure engine start levers on aisle stand are in CUT-OFF position.
K.  Ensure fuel feed system indicator lights by operating master dim and test circuits and by actuating press-to-test indicator lights.
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4. Trouble Shoot Fuel Feed System

(Continued next page) (Continued next page) (Continued next page) (Continued next page) (Continued next page) Turn on engine boost pumps, one at a time. Check that as each boost pump comes up to pressure, corresponding low pressure warning light extinguishes. IF -
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NOT OK  BOOST PUMP DOES NOT OPERATE (As confirmed by sound and feel at respective pump dry bay or forward spar location) -PROCEDURE 3 
　
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