CAUTION:  DO NOT PUT ON COTTON SOCKS UNTIL YOU ARE TO GO INTO THE FUEL TANK. IF THE COTTON SOCKS ARE NOT CLEAN, YOU CAN CAUSE DAMAGE TO THE FUEL

(f)  
Put rubber bands around your wrists and ankles to hold clothes tight.

(8)  
Attach a safety line to the person who goes into the fuel tank.

(9)  
Make sure the person who goes into the fuel tank and the observer agree on safety signals.

(10)
If a confined space communication system is used, attach the system.

(a)  Do a check to make sure the system operates correctly.

(11)
Put on the necessary respiration protection.

(12)
Make sure the respirator operates.

(13)
Do these steps if you are the observer:

(a)  
Make sure the confined space entry permit is complete and approved (if this is a requirement).

(b)  
Make a record that shows the time and who is inside the fuel tank.

(c)  
Attach this sign at the fuel tank entry location where it can be seen:
1) CAUTION - PERSONNEL INSIDE - MOVE NO EQUIPMENT

(d)  
Make sure you and the person who will go into the tank agree that the checklist items are complete.

(e)  
Make sure you and the person who will go into the tank agree on communication signals and set a communication time interval.

(f)  
Look at the filter-regulator to make sure the supplied air system operates correctly.

(g)  
Keep visual contact with the fuel tank entry location.

(h)  
Keep constant communication with the person in 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.

(k)  
Look out for any changes which could cause a dangerous condition.

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

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

(15)
Go into the fuel tank.

(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.

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

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(a)  Bond the air duct to the airplane structure.
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 AND ALLOW THE PERSON TO COOL DOWN. FIND OUT IF MEDICAL ASSISTANCE IS NECESSARY.
(18) The observer must keep in communication with the person(s) in the tank and watch for changes in conditions or a signal of danger.
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.
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WARNING:  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.
　
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