(h)  
Keep constant communication with the person(s) the fuel tank.

 (i)  
Look at the combustible gas indicator to make sure the air in the fuel tank is at 10% or less of the lower explosive limit.

 (j)  
Do not put your head in the fuel tank access hole unless you have the correct respirator on, for the condition of the tank, and there is another observer to watch you.

 NOTE: This is considered the same as a fuel tank entry.
____
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737-300/400/500MAINTENANCE MANUAL
 (k)  
Look out for any changes which could cause a dangerous condition.

 (l)  
Make sure person(s) in the fuel tank get out if there is a dangerous condition.

 S 942-398
 (14)
 Persons with respirators must touch the identified airplane ground to release static electricity before they go into the fuel tank.

 S 492-399

 (15)
 Go into the fuel tank.

 S 482-400

 (16)
 As an alternate procedure, you can take an additional combustible gas indicator into the fuel tank to monitor the environment where you will do the maintenance.

 S 492-401

 (17)
 If it is necessary for your air ventilation system, route the air duct to the maintenance area (Fig. 204).

 (a)  Bond the air duct to the airplane structure.
 S 942-402
 WARNING: MAKE SURE TO WEAR THE CORRECT RESPIRATION PROTECTION FOR THE
_______ CONDITION OF THE FUEL TANK. PERSONS WHO BREATHE HIGH CONCENTRATIONS OF FUEL VAPOR CAN GET HEADACHES, FEEL SLEEPY OR FAINT. IF A PERSON'S BREATH SLOWS OR STOPS, SEND A PERSON FOR MEDICAL ASSISTANCE. GET THE PERSON OUT OF THE TANK IMMEDIATELY. START ARTIFICIAL RESPIRATION AT ONCE IF A PERSON'S BREATH STOPS. CONTINUE THE ARTIFICIAL RESPIRATION. PERSONS WITH HEADACHES, OR IRRITATION OF THE EYES OR SKIN SHOULD GET OUT OF THE FUEL TANK AT ONCE. JET FUELS CONTAIN SMALL QUANTITIES OF CHEMICAL ANTIOXIDANTS, METAL DEACTIVATORS AND CORROSION INHIBITORS. THESE CHEMICALS ARE IRRITANTS. IF SPLASHED INTO THE EYES, FLUSH THE EYES WITH WATER FOR A MINIMUM OF 15 MINUTES. LIFT THE UPPER AND LOWER EYELIDS FREQUENTLY TO REMOVE CHEMICALS. GET MEDICAL ASSISTANCE IMMEDIATELY.
 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.
 (18) The observer must keep in communication with person(s) in the tank and watch for changes in conditions or a signal of danger.
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 S 682-403
 WARNING:_______ USE ONLY SPONGES AND COTTON RAGS TO ABSORB SUMP FUEL.  OTHER
 MATERIALS CAN CAUSE THE RELEASE OF STATIC ELECTRICITY.  THE
 RELEASE OF STATIC ELECTRICITY CAN CAUSE AN EXPLOSION IN THE
 FUEL TANK.
 MAKE SURE THERE IS A GOOD FLOW OF AIR WHEN YOU USE SPONGES OR
 RAGS TO ABSORB THE SUMP FUEL.  DO NOT REMOVE THE RESPIRATOR
 WHEN YOU ARE IN THE FUEL TANK.  DO NOT DO MAINTENANCE IN THE
 FUEL TANK UNTIL ALL FUEL IS REMOVED FROM THE AREA.  A LARGE
 CONCENTRATION OF FUEL VAPORS COULD KILL YOU.

 (19) Do these steps to remove any fuel that remains in the fuel tank:
 (a)  
Put sponges and lint-free cotton rags on the bottom of the fuel tank to absorb any fuel that remains in the tank.

 (b)  
Count the number of sponges and cotton rags as they are put into the fuel tank.

 (c)  
Remove the sponges and cotton rags when they are soaked.

 (d)  
Count the number of sponges and cotton rags as they are removed from the fuel tank.
　
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