(c)  
Wear shoes with metal clips or exposed nails.

 (d)  
Wear or use battery-operated devices such as hearing aids, electrical pacemakers or watches, pocket radios, cellular phones or paging equipment unless it is explosion-proof and permitted by approved persons.

 S 912-334
 (9)  Persons who work in an open fuel tank must wear approved fuel tank protective clothing. Protective clothing includes:
 (a)  Cotton coveralls with non-sparking zippers or buttons. Do not wear wool, silk, nylon or other synthetic clothing.
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A 737-300/400/500MAINTENANCE MANUAL
 WARNING:_______ COVERALLS THAT ARE COATED WITH SARANEX 23P WILL KEEP BODY
 HEAT IN.  MAKE SURE THE TEMPERATURE IN THE FUEL TANK DOES
 NOT GET TOO HOT.  IF THE FUEL TANK TEMPERATURE GETS TOO
 HOT, A PERSON IN SARANEX 23P COVERALLS CAN HAVE
 HEAT-RELATED DISORDERS.  IF A PERSON BECOMES TOO HOT, GET
 THE PERSON OUT OF THE FUEL TANK.  FIND OUT IF MEDICAL

 ASSISTANCE IS NECESSARY.
 (b)  
Saranex coveralls are also approved for use in fuel tanks.

 (c)  
Clean cotton boot socks or fuel cell boots.

 NOTE: It is recommended that boot socks be worn over fuel cell
____ boots when you stand in a fuel tank. This will reduce the chance that you will slip and fall down.
 (d)  
Clean cotton head cover (doctor-type hats) with tie strings or a lint free shower-type cap with an attached elastic headband.

 (e)  
Cotton or rubber gloves.

 S 912-335
 (10) Persons who work in or near an open fuel tank must not remove or
___ change clothes near an open fuel tank. You can create sufficient static electricity in the clothes to cause fuel vapor to ignite.
 S 912-336
 (11) Persons who work in fuel tanks must wear the correct respiratory protection for the fuel tank conditions.
 (a)  
Persons that use respiratory protection must be trained and know the proper use and limitations of respiratory protection.

 (b)  
An approved respirator with an attached breathing-air supply is necessary for each person who goes into a fuel tank that is in a fire-safe condition.

 (c)  
An approved half-mask respirator with a organic vapor filter, at a minimum, is recommended for each person who goes into a fuel tank that is in a health-safe condition.

 (d)  
Airline Hoods (or equivalent) should be worn by persons if the respirator does not fit correctly due to facial hair or other facial configurations.

 S 912-337
 (12) At each fuel tank entry location there must be an observer who is outside of the fuel tank. The observer's responsibility is to make sure that person(s) in the fuel tank are safe. The observer must remain outside of the fuel tank in visual contact with the access opening. The observer must be able to communicate with the person(s) inside the fuel tank at all times.
 (a)  There are two ways the observer and the person(s) in the fuel tank can communicate: 1) A confined space communication system designed for aircraft
 fuel tank use.
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A
737-300/400/500MAINTENANCE MANUAL
 2)  The observer and the person who will go into the tank can agree on a communication plan such as tugs on the safety rope at a set time interval.
 S 912-338
 (13)
 The observer must also keep a report that shows who is in the fuel tank and when that person comes out. A sign attached to the ladder or support equipment which states, "CAUTION - PERSONNEL INSIDE -MOVE NO EQUIPMENT", must be placed at the location of a fuel tank entry. When the personnel in the tank come out, the observer should remove the sign or place it where it does not show.

 S 912-339
　
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