(7)  
Make sure the downlocks are installed on the nose and main landing gear
(AMM 32-00-01/201).

WARNING:  USE THE PROCEDURE IN AMM 32-00-01/201 TO INSTALL THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

(8)  
Open the doors for the landing gear and install the door locks (AMM 32-00-01/201).

(9)  
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

(10)
Make sure the fuel pump switch Lights on the overhead panel, P5, are in the off position, and attach DO-NOT-OPERATE tags. 

(11)
Make sure the boost pump switch lights on the right side panel, P6, are in the OFF position, and attach DO-NOT-OPERATE tags.

(12)
Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:

(a)  
BOOST PUMP TANK 1 FWD

(b)  
BOOST PUMP TANK 2 FWD

(c)  
BOOST PUMP TANK 1 AFT 

(d)  
BOOST PUMP TANK 2 AFT

(e)  
BOOST PUMP CTR TANK LEFT

(f)  
BOOST PUMP CTR TANK RIGHT

(g)  
FUEL PUMPS L CTR

(13)
Open the applicable circuit breakers for the system on which you will do maintenance.

(14)
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.

(15)
Remove the electrical power from the airplane before you remove the fuel tank access doors (AMM 24-22- 201).

(16)
Do not supply electrical power again until you complete the Go Out of and Close the Fuel Tank procedure.

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.

(17)
Disconnect the storage battery (AMM 24-31-11/401).

(18)
Attach this sign to each of the battery locations:

(a)  OPEN FUEL TANKS - DO NOT CONNECT

(19)
Attach this sign to the external power receptacle:

500 
May 01/98  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-10-0 Page 225 

(a)  OPEN FUEL TANKS - DO NOT PUT POWER ON
E.  Prepare the Equipment for Fuel Tank Purging
(1)
Read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.

WARNING:  OBEY THE PURGING AND FUEL TANK ENTRY PRECAUTIONS. FAILURE TO OBEY THE FUEL TANK ENTRY PRECAUTIONS CAN CAUSE SERIOUS IN OR-DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.

(2)  
Make sure one of these portable fire extinguishers is available: 

(a)  
one - 150 pound dry chemical wheeled extinguisher

(b)  
one - 150 pound C02 wheeled extinguisher

(c)  
one - 150 pound Halon wheeled extinguisher

(3)  
Make sure the electrical equipment is approved and is appropriate for the hazardous location as shown in Fig. 201.

(4)  
Make sure all radio or radar equipment is off and locked out if it is closer than the minimum separation distance allowed in Table 201.

(5)  
Do these steps to prepare metal support equipment such as work platforms/stands, ladders etc:

NOTE:  These steps apply to all metal support equipment within a 50-foot radius of an open fuel tank.
(a)  
All support equipment must be in place before you begin the fuel purging procedure.

(b)  
Bond the support equipment at an approved airplane bonding location.

(c)  
Ground the support equipment to the same earth ground as the airplane.

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(6)  VENTURI TYPE VENTILATION EQUIPMENT; Do these steps to prepare the air ventilation equipment for purging:
(a)  For the main fuel tanks, do these steps (Fig. 203): 1) Go to the applicable left or right overwing fill port on top of the wing. 2) Connect an air supply hose to the air mover assembly. 3) Bond the air mover assembly to the airplane ground. 4) Remove the cap on the overwing fill port. 5) Install the air mover assembly in the overwing fill port. 6) Put the exhaust horn of the air mover in the overwing fill port vertically above the
　
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