S 862-360
(15)
Disconnect the storage battery (AMM 24-31-11/201).
S 942-361
(16)
Attach this sign to each of the battery locations:
(a) OPEN FUEL TANKS - DO NOT CONNECT
S 942-362
(17) Attach this sign to the external power receptacle:
(a) OPEN FUEL TANKS - DO NOT PUT POWER ON
G. Prepare the Equipment for Fuel Tank Purging
S 912-363
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 942-364
(2)
Make sure one of these portable fire extinguishers is available:
(a)
one - 150 pound (68 kilogram) dry chemical wheeled extinguisher
(b)
one - 150 pound (68 kilogram) CO2 wheeled extinguisher
(c)
one - 150 pound (68 kilogram) Halon wheeled extinguisher
S 942-365
(3)
Make sure the electrical equipment is approved and is appropriate for the hazardous location as shown in Figure 201.
S 862-366
(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.
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28-10-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
S 942-367
(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.
S 492-368
(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 wing to let the fuel vapors leave the fuel tank.
7) Put the portable air compressor a minimum of 100 feet (30 meters) from the fuel tank that will be opened, unless the air compressor is explosion-proof.
8) Connect the air compressor to the air mover with the air
supply hose. 9) Connect a power supply to the air compressor. 10) Make sure each flexible air duct section is attached
correctly and that each section is bonded correctly.
WARNING: MAKE SURE THE AIR MOVER ASSEMBLY IS AWAY FROM THE
_______ AIRPLANE. THE EXHAUST AIR FROM THE AIR MOVER EXHAUST HORN MUST VENT AWAY FROM THE AIRPLANE STRUCTURE. IF THE EXHAUST AIR FLOWS AGAINST THE AIRPLANE STRUCTURE, A BUILD-UP OF STATIC ELECTRICITY CAN OCCUR. IT IS POSSIBLE THAT THE STATIC ELECTRICITY CAN IGNITE THE FUEL VAPOR AND CAUSE AN EXPLOSION. AN EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND DAMAGE TO EQUIPMENT.
11) Set-up the air mover assembly away from the airplane. 12) Ground the air mover assembly to the airplane ground.
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