(c)  
6H15, L AFT FUEL BOOST PUMP

 (d)  
6H17, R FWD FUEL BOOST PUMP

 (e)  
6H20, R AFT FUEL BOOST PUMP

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757 MAINTENANCE MANUAL
 (f)  6H23, L FWD FUEL BOOST PUMP
 S 862-276
 (12)
 Open the applicable circuit breakers for the system on which you will do maintenance.

 S 942-277

 (13)
 Look at the maintenance history of the airplane.

 (a)  
Open the applicable circuit breakers for any system(s) that show a problem with wiring or electrical faults.

 S 862-278
 (14) Remove the electrical power from the airplane before you remove the fuel tank access doors (AMM 24-22-00/201).
 S 942-279
 WARNING: DO NOT USE AIRPLANE ELECTRICAL POWER WHEN FUEL TANK ACCESS
_______ DOORS ARE OPEN. A FIRE OR EXPLOSION CAN OCCUR IF FUEL VAPOR IS IGNITED BY SPARK(S) FROM ELECTRICAL EQUIPMENT. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
 (15)
 Do not supply electrical power again until you have completed this procedure: Go Out of and Close the Fuel Tank.

 S 862-280

 (16)
 Disconnect these airplane batteries:

 (a)  
Main (AMM 24-31-01/401)

 (b)  
APU (AMM 24-31-03/401)

 S 942-281
 (17)
 Attach this sign to each of the battery locations:

 (a)  
OPEN FUEL TANKS - DO NOT CONNECT

 S 942-282
 (18)
 Attach this sign to the external power receptacle:

 (a)  
OPEN FUEL TANKS - DO NOT PUT POWER ON

 F.
Prepare the Equipment for Fuel Tank Purging

 S 912-283
 WARNING:_______OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS. FAILURE TO OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
 (1)  Read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.
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A 757 MAINTENANCE MANUAL
　
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