GLOVES
NO BUTTONS OR
ZIPPERS SHOWN
+ + +++
++
+ + + +
OR WOOL CLOTHING
+
+
+
+ - -
- -
+ -- -
+ + --- - --
+ ---- -
+ + THAT CONTAINS FUEL TANK FUEL VAPOR
CLEAN COTTON COVERALL
CLEAN 100% COTTON SOCKS
_______WARNING: A 100% COTTON COVERALL, FITTED SNUGLY AT WRIST DO NOT WEAR WOOL, SILK, OR NYLON CLOTHING. WEAR ELECTRICITY AND CAUSE AN EXPLOSION. WOOL, SILK OR NYLON CLOTHING CAN RELEASE STATIC AND ANKLES, WITH NON-SPARKING ZIPPER OR BUTTONS.
Fuel Tank Entry Precautions Figure 202
G54134
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A
747-400
MAINTENANCE MANUAL
EQUIPMENT TO MOVE AIR THROUGH THE FUEL TANK
Tank Ventilation Equipment
Figure 203 (Sheet 1)
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ALL ú ú 01 Page 204 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
Tank Ventilation Equipment
Figure 203 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
B. Purging and Fuel Tank Entry - Definitions
S 912-373
(1)
Approved Persons:
(a)
Persons who are trained and understand the dangers and procedures for fuel tank entry and are responsible to make sure the airplane, equipment and the environment is safe for maintenance operations.
S 912-374
(2)
Approved Persons for Fuel Tank Entry:
(a)
Persons who are trained and understand the dangers and procedures for fuel tank entry.
S 912-375
(3)
Class I, Division 1, Hazardous Locations (or equivalent standard):
(a)
Locations where ignitable concentrations of flammable gases or vapors can exist under standard operational conditions.
(b)
Locations where ignitable concentrations of flammable gases or vapors may exist frequently because of repair or maintenance operations.
(c)
Locations where ignitable concentrations of flammable gases or vapors can exist because of leakage.
(d)
Locations where equipment problems or incorrect operation of equipment or processes can release ignitable concentrations of flammable gases or vapor, and can also cause failure of electrical equipment at the same time.
S 912-376
(4)
Class I, Division 2, Hazardous Locations (or equivalent standard):
(a)
Locations where flammable liquids or gases are handled, processed or used, but where the liquid, vapors, or gases will usually be in closed containers or closed systems. The containers or systems will not allow the release of liquid, gas or vapor in sufficient quantity to produce an ignitable fuel and air mixture unless the container or system fails or is damaged.
S 912-377
(5)
Explosion-Proof Equipment:
(a)
Equipment contained in a case that will not be damaged by an internal explosion caused by explosive vapors inside the unit.
(b)
Equipment which will not cause explosive vapors around the unit to ignite even when sparks, flashes or an explosion of vapor occurs inside the unit.
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