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 (9)  Permissible Exposure Level (PEL):
 (a)  The time weighted average airborne concentrations of substances at which it is believed that nearly all workers may be repeatedly exposed 8 hours a day, 40 hours a week, without adverse health effects.
 NOTE: The PEL limits used in this procedure are the PEL limits
____ used by Boeing personnel during fuel tank entry. If the local PEL limits are more restrictive than the ones given in this procedure, use the equivalent local PEL limits.
 S 912-299
 (10) Purging or Purged (For Fuel Tank Entry):
 (a)  Purging an aircraft fuel tank is defined as the removal of any fuel or fuel vapor that remains after the fuel tanks are sumped. A purged fuel tank contains a nonflammable atmosphere that can be maintained by mechanical ventilation.
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 (11) Unwanted Sources of Ignition:
 (a)  Unwanted sources of ignition include: 1) open flames (matches, cigarette lighters etc.) 2) electrical equipment (lights, motors, sparks from engine
 exhaust etc.) 3) frictional hot spots 4) electromagnetic energy (radio transmissions or radars) 5) static electricity 6) lightning
 C. Purging and Fuel Tank Entry - Airplane Precautions
 S 912-301
 (1)  
Do the maintenance on the fuel tanks in areas which allow the free movement of air, fire fighting equipment and other emergency equipment.

 S 912-302

 (2)  
A rope barrier must be placed around the airplane, to identify the Class I, Division 1 hazardous locations. See Figure 201 for the distance requirements. The rope barrier must include signs or placards which state "DANGER - OPEN FUEL TANKS.

 S 912-303

 (3)  
The airplane must be correctly grounded to an approved ground before you defuel the airplane or open any fuel tanks.

 S 912-304
 WARNING: DO NOT USE AIRPLANE ELECTRICAL POWER WHEN FUEL TANK ACCESS
_______ DOORS ARE OPEN. A FIRE OR EXPLOSION CAN OCCUR IF FUEL VAPOR IS IGNITED BY SPARK(S) FROM ELECTRICAL EQUIPMENT. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
 (4)  
Before the fuel tank access doors are opened, all of the electrical power to and from the airplane must be removed. Placards which state that power should not be restored on the airplane until the fuel tank(s) are closed should be attached to applicable locations.

 S 912-305

 (5)  
The main storage battery must be disconnected (AMM 24-31-11/201). Placards which state not to connect the batteries until the fuel tanks are closed should be attached to all disconnected battery locations.

 S 912-306

 (6)  
All safety, support and maintenance equipment must be in place before you open the fuel tank access doors. Movement of equipment can cause sparks which can cause fuel vapors to ignite.

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 (7)  No painting operations are permitted on airplanes with open fuel tanks.
 D. Purging and Fuel Tank Entry - Electrical Equipment Precautions
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 S 912-308

 WARNING:_______FOLLOW THE SUBSEQUENT RADIO AND RADAR LIMITS. FAILURE TO FOLLOW THE SUBSEQUENT RADIO AND RADAR LIMITS CAN CAUSE A FIRE OR EXPLOSION. A FIRE OR EXPLOSION CAN CAUSE SERIOUS INJURY OR DEATH TO PERSONS AND CAN CAUSE DAMAGE TO EQUIPMENT.
　
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