E. Access
 (1)  Location Zones
 221 Center Section Fuel Tank
 305 Left Fuel Tank
 405 Right Fuel Tank

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737-300/400/500MAINTENANCE MANUAL
 (2)  Access Panels
 7202 Fuel Tank Access Door
 7204 Fuel Tank Access Door

 F. Prepare the Airplane for Fuel Tank Purging
 S 942-343
 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.

 S 652-344

 (2)  
Do this task: Pressure Defueling (AMM 28-23-00/201).

 S 652-345

 (3)  
Drain the fuel tank sumps (AMM 12-11-00/301).

 S 942-346

 (4)  
Make sure the airplane is correctly grounded to an approved and identified ground (AMM 20-40-11/201).

 S 492-347
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE TRAILING EDGE FLAPS.
_______ ACCIDENTAL OPERATION OF THE TRAILING EDGE FLAPS COULD CAUSE INJURY TO PERSONS.
 (5)  Do the deactivation procedure for the trailing edge flaps
 (AMM 27-51-00/201).

 S 492-348
 WARNING: DO THE DEACTIVATION PROCEDURE OF THE LEADING EDGE SLAT
_______ (AMM 27-81-00/201). IF THE LEADING EDGE SLAT OPERATES ACCIDENTALLY, IT CAN CAUSE INJURY.
 (6)  Do the deactivation procedure of the leading edge slats
 (AMM 27-81-00/201).

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 S 492-430
 WARNING: MAKE SURE YOU INSTALL THE GROUND LOCK ASSEMBLIES IN THE LANDING
_______ GEAR TO PREVENT ACCIDENTAL OPERATION OF THE GEAR. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT IF THE GEAR RETRACTS.
 (7)  
Make sure the ground lock assemblies are installed on the nose and main landing gear (AMM 32-00-01/201).

 S 942-351

 (8)  
Put ropes around the airplane to identify the hazardous location areas (Figure 201), and attach these signs with words you can see clearly written on both sides:

 (a)  
DANGER - OPEN FUEL TANKS - NO SMOKING

 (b)  
AUTHORIZED PERSONNEL ONLY

 S 862-353
 (9)  
Make sure the boost pump switches on the P5 overhead panel are in the OFF position, and attach DO-NOT-OPERATE tags.

 S 862-354

 (10)
 Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Main Power Distribution Panel
 1) TANK-1 FWD BOOST PUMP
 2) TANK-2 FWD BOOST PUMP
 3) TANK-1 AFT BOOST PUMP
 4) TANK-2 AFT BOOST PUMP
 5) CENTER TANK BOOST PUMP LEFT
 6) CENTER TANK BOOST PUMP RIGHT

 S 862-356
 (11)
 Open the applicable circuit breakers for the system on which you will do maintenance.

 S 942-357

 (12)
 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 862-358
 (13) Remove the electrical power from the airplane before you remove the fuel tank access doors (AMM 24-22-00/201).
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