(14)
Many local, state and national regulatory agencies require a confined space entry permit to be signed and approved before a person goes into a fuel tank. A pre-entry checklist is often required by the confined space entry permit. It is recommended that a pre-entry checklist be used before you go into a fuel tank. Figure 206 is an example of a pre-entry checklist used at Boeing facilities.
G. Purging and Fuel Tank Entry - Adverse Weather Conditions
S 912-340
(1)
When thunderstorms or lightning are within a 10 mile (16 kilometer) radius of the immediate area, open fuel tank maintenance procedures should stop. Persons inside of the fuel tanks should get out. Air ducts inside the fuel tanks should be removed and the power for all support equipment should be switched off. The fuel tank access openings must be closed.
S 912-341
(2)
Strong wind conditions can cause a build-up of static electricity. Large charges of static electricity can develop on support equipment while parked as a result of the movement of dust particles and air currents during strong wind conditions. Strong wind conditions can also cause the unwanted movement of items or equipment which can hit the airplane or injure persons. Wind gusts can damage the airplane structure. Fueling, defueling or open fuel tank maintenance procedures should stop if strong wind conditions are present.
TASK 28-10-00-912-342
3. Purging and Fuel Tank Entry___________________________
A. General
(1) This task contains these procedures:
(a)
Prepare the Airplane for Fuel Tank Purging
(b)
Prepare the Equipment for Fuel Tank Purging
(c)
Purging of the No. 1 and No. 2 Tank
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A 737-300/400/500MAINTENANCE MANUAL
Hazardous Locations - Open Fuel Tank(s)
Figure 201
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G60040
A
737-300/400/500
MAINTENANCE MANUAL
DO NOT PUT SHARP TOOLS IN THE FUEL TANK
CLEAN 100% COTTON CAP
(WITHOUT VISOR)
USE APPLICABLE BOX FOR TOOL PARTS WHILE IN THE FUEL TANKS. USE FLUID RESISTIVE AND STATIC SAFE TOOLS AND CONTAINERS
WEAR ONLY 100% COTTON CLOTHING
WEAR ONLY COTTON SHORTS AND COTTON TEE SHIRTS WITHOUT POCKETS UNDER COVERALLS
NO POCKETS (IF THERE ARE POCKETS, REMOVE ALL CONTENTS FROM POCKETS AND SEW CLOSED)
REMOVE ALL RINGS AND WATCHES
RUBBER GLOVES NYLON, RAYON, SILK OR WOOL CLOTHING
+
+
+
+-
-
--
+--
-
-
-+ --
+ --
-
+--
-
-
+ +
FUEL TANK
THAT CONTAIN
CLEAN
FUEL VAPOR
NO BUTTONS OR
100%
ZIPPERS SHOWN
COTTON
SOCKS
CLEAN COTTON COVERALL
WARNING:DO NOT WEAR WOOL, SILK, OR NYLON CLOTHING. WEAR A 100% COTTON COVERALL, FITTED SNUGLY AT WRIST AND ANKLES, WITH NON-SPARKING ZIPPER OR BUTTONS. WOOL, SILK OR NYLON CLOTHING CAN RELEASE STATIC ELECTRICITY AND CAUSE AN EXPLOSION.
Fuel Tank Entry Precautions Figure 202
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+++ + +
+
+
+
+
G60054
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A 737-300/400/500MAINTENANCE MANUAL
VENTILATION
VENTILATION EQUIPMENT
A
Tank Ventilation Equipment
Figure 203 (Sheet 1)
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