S 912-249

 (4)  
The fuel tank must be in a health-safe condition before you can go into the fuel tank without a breathing-air supply. When the fuel tank is in a health-safe condition, at a minimum, it is recommended that a half-mask respirator with an organic vapor filter be used. It is necessary to have a good flow of air through the fuel tank to get a health-safe condition. The air must flow continuously during the fuel tank entry procedure.

 S 912-250

 (5)  
Hydrocarbon fuels that touch the skin can remove protective oils. Without protective oils, the skin can become dry, chapped, cracked, or possibly become infected. If a person breathes too much fuel vapor, the person can become dizzy, get a headache or lose his or her coordination. Jet fuel is composed of many different kinds of hydrocarbon molecules. Exposure to some of these molecules for a long time is known to cause cancer.

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 28-11-00
 ALL  ú ú 01 Page 213 ú Jun 20/97

A

757
MAINTENANCE MANUAL

 S 912-251
 (6)  
Vapors from fuel or other materials (solvents etc.) used for fuel tank maintenance can replace oxygen from a confined area such as a fuel tank or dry bay. If a person goes into a confined area that contains fuel vapor (or other vapors) without an air supply, the person may not get enough oxygen. This may cause unconsciousness or death. Make sure the environment is continously monitored with an approved combustible gas indicator.

 S 912-252

 (7)  
No one is allowed to go into or remain in a fuel tank if:

 (a)  
The flammable vapor concentration is more than 10% of the lower explosive limit.

 (b)  
The oxygen content of the fuel tank is below 19.5% or above 23.5%.

 (c)  
The air ventilation system fails.

 (d)  
A strong fuel odor is noticed.

 (e)  
A person feels any physical problems, such as trouble breathing, dizziness, irritation, confusion, light-headedness, fullness in the head, ringing sensation on the ears, nausea, headache, difficulty in breathing, sensation of apparent suffocation, immobility, unusual behavior, failure to respond to communication, or other signs of illness.

 (f)  
There is an observed or reported hazard which may reduce the level of safety.

 S 912-253
 (8)  Persons who work in or near an open fuel tank must not:
___
 (a)  
Slide metal objects, such as tool boxes, ladders, etc.

 (b)  
Carry matches or pocket warmers.
　
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