G. Purging and Fuel Tank Entry - Adverse Weather Conditions
(1)
When thunderstorms or lightning are within a 10 mile 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.
(2)
Strong wind conditions can cause a build-up of static electricity. Large charges of static electricity can develop on
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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.
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)
Fuel Tank Purging
(d)
Fuel Tank Entry
(e)
Go out of and Close the Fuel Tank
(2)
Make sure you read and obey the precautions in this task:
Purging and Fuel Tank Entry Precautions.
B. References
(1)
AMM 12-11-0/201, Fuel Servicing
(2)
AMM 12-31-21/201, Body Section 43 Access Doors and Panels
(3)
AMM 20-40-11/201, Static Grounding
(4)
AMM 24-21-21/401, APU Battery
(5)
AMM 24-22-0/201, Manual Control (Apply Power)
(6)
AMM 27-31-11/401, Storage Battery (Nickel-Cadmium)
(7)
AMM 27-51-0/201, Trailing Edge Flaps
(8)
AMM 27-81-0/201, Leading Edge Flaps and Slats
(9)
AMM 28-11-11/401 Wing Fuel Tank Access Panels
(10)
AMM 28-11-31/401, Integral Center Tank Access Panel
(11)
AMM 28-23-0/201, Defueling
(12)
AMM 32-00-01/201, Ground Lock Assemblies
C. Equipment
(1)
Air Compressor-Explosion-proof, for use with the Lamb Air Mover (commercially available)
(2)
Blower - Air Heater/Blower, Explosion-proof,
Coats Model GH75-2
CAM Industries Inc.,
Kent, Washington USA
(3)
Combustible gas indicator - explosion-proof
Use one of these indicators or equivalent:
(a)
Gastech GT series indicator
(b)
Gastech 1314 Super Surveyor
(c)
Gastech 1314 SMPN Super Surveyor Available from:
Gastech Inc.
8407 Central Avenue,
Newark, California, USA
(4)
Confined Space Communication System - use this system or
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equivalent:
(a) CS1-2000 or CS1-1000 intrinsic safe systems
CON-SPACE COMMUNICATIONS INC.
P.O. BOX 1540
1160 Yew Ave.
Blaine, Washington, USA
(5)
Containers, plastic - Non-static material and rounded corners, used to hold tools or absorb fuel in the fuel tank
(6)
Coveralls - use one of these approved coveralls:
(a)
Cotton (100%) clothing (Fig. 202, 204)
Aramark, Uniform Services
P.O. Box 3556
Seattle, Washington 98124
(b)
TYVEK/SARANEX 23-P Coveralls
(7)
Boots - Neoprene, Part Number RB35 (or equivalent) - Large Recommended Safety & Supply Co. 5510 E. Marginal Way South Seattle, Washington, 98134 Phone: (206) 762-8500
(8)
Fire Extinguisher - 150 pounds, portable, wheeled (commercially available). Use one of these types of fire extinguishers:
-
dry chemical
-
carbon dioxide
-
Halon
(9)
Flashlight - Explosion-proof (commercially available)
(10)
Light - Explosion-proof, Model EP-300 026 (or equivalent) KH Industries
P.O. BOX 312
Angola, New York, USA
(11)
Respiratory equipment (use the applicable equipment) (Fig. 204)
(a)
Air Supply Hoses - commercially available
(b)
Breathing Air Supply - 125 psig maximum output
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