(b)  
Ground the air mover ventilation equipment to the airplane ground.

 (c)  
Put the portable air compressor a minimum of 100 feet from the fuel tank that will be opened, unless the air compressor is explosion-proof.

 (d)  
Make sure each flexible air duct section is attached correctly and that each section is bonded correctly.

 (e)  
Connect the air compressor to the air mover ventilation equipment with the air hose.

 (f)  
Connect a power supply to the air compressor.

 H.  
Prepare the Air Blower Type Ventilation Equipment for Purging (Fig. 203)

 S 862-530
 (1)  
Set-up the ventilation blower(s) in an area where the fuel tank entry will be made.

 S 862-531

 (2)  
Make sure the ventilation blower will be in an area free from fuel vapor when the access doors are open.

 S 492-534

 (3)  
Attach the static grounding cable on the ventilation blower(s) to an approved ground source.

 S 482-532

 (4)
Do these steps to connect an air supply to the ventilation blower:

 (a)  
If shop air is used, connect an air supply hose to the ventilation blower.

 (b)  
If a portable air compressor is used, do these steps:

 1)  Put the air compressor a minimum of 100 feet from the fuel tank that will be opened, unless the air compressor is explosion-proof.
 2)  Connect an air supply hose from the air compressor to the ventilation blower. 3) Connect the portable air compressor to a power source.
 S 492-533
 (5)
Do these steps to connect the air ducts to the ventilation blower.

 (a)  
Connect the air duct to the ventilation blower.

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 ALL  ú ú 04 Page 234 ú Feb 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
Connect enough air duct segments to get to the access door where you will do maintenance.

 (c)  
Use the attached bonding connections to electrically bond each air duct segment.

 (d)  
FOR MAIN TANK MAINTENANCE OUTBOARD OF WING STATION 944; Attach the access door adapter to the end of the air duct.

 (e)  
FOR MAIN TANK MAINTENANCE INBOARD OF WING STATION 944; Do these steps to prepare the air ducts that will go inside the fuel tank:

 NOTE: The air ducts will be positioned inside the fuel tank at
____ the location where you will do the maintenance.
 1)  Attach an adapter/reducer to the end of the eight inch air
 duct segments. 2) Attach the four inch air ducts. 3) Use the attached bonding connections to electrically bond
 each air duct segment. 4) Make sure you have enough segments to route the air ducts to the maintenance area.
 I.  Prepare the Heater/Air Blower Equipment for Purging (Fig. 203)
 NOTE: The use of a heater/air blower is for the comfort of persons
____ in the fuel tank. It is not part of the air ventilation equipment which is used to remove hazardous fuel vapor during the fuel purging procedure. The heater/air blower is an optional component.
 S 492-535
 (1)  
Set-up the heater/air blower in the area where the fuel tank entry will be made.

 S 492-536

 (2)  
Make sure the heater/air blower will be in an area free from fuel vapor when the access doors are open.

 S 492-537

 (3)  
Attach the static grounding cable on the heater/air blower(s) to an approved ground source.

 S 492-538

 (4)  
Do these steps to connect an air supply to the blower:

 (a)  
If shop air is used, connect an air supply hose to the heater/air blower.

 (b)  
If a portable air compressor is used, do these steps:

 1)  Put the air compressor a minimum of 100 feet from the fuel tank that will be opened, unless the air compressor is explosion-proof.
 2)  Connect an air supply hose from the air compressor to the heater/air blower.
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