757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 1(46)

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 S 492-290
 (8)  HEATER AIR/BLOWER EQUIPMENT; Do these steps to prepare the heater/air blower equipment for purging (if it is necessary):
 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.
 (a)  
Set-up the heater/air blower in the area where the fuel tank entry will be made. 1) Make sure the heater/air blower will be in an area free

 from fuel vapor when the access doors are open.

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

 (c)  
Do these steps to connect an air supply to the blower: 1) If shop air is used, connect an air supply hose to the heater/air blower. 2) If a portable air compressor is used, do these steps:

 a)  Put the air compressor a minimum of 100 feet from the fuel tank that will be opened, unless the air compressor is explosion-proof.
 b)  Connect an air supply hose from the air compressor to the heater/air blower. c) Connect the portable air compressor to a power source.
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MAINTENANCE MANUAL

 (d)  Do these steps to connect the air ducts to the heater/air blower. 1) Connect the air duct to the heater/air blower outlet port. 2) Connect enough air duct segments to get to the maintenance
 area.
 3)  Connect the air duct segments to the inlet port on the ventilation blower (if it is necessary for your ventilation system set-up).
 4)  Use the attached bonding connections to electrically bond each air duct segment.
 (e)  Connect a power supply to the heater/air blower.
 S 482-291
 WARNING: MAKE SURE THE COMBUSTIBLE GAS INDICATOR IS EXPLOSION-PROOF
_______ (CLASS I, DIVISION 1 OR EQUIVALENT STANDARD) AND IS SATISFACTORY FOR USE IN A FUEL TANK. IF YOU USE A COMBUSTIBLE GAS INDICATOR THAT IS NOT INTENDED FOR USE IN A FUEL TANK, AN EXPLOSION CAN OCCUR. AN EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND DAMAGE TO EQUIPMENT.
 (9)  Do these steps to prepare the combustible gas indicator (Fig. 205):
 NOTE: These steps are for the combustible gas indicators called out
____ in the equipment section of this procedure. If you use a different combustible gas indicator, use the instruction manual supplied with the indicator.
 (a)  Make sure the indicator is calibrated for each of these scales:
　
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