(2)
Purging and Fuel Tank Entry
(3)
Biocide Treatment of Fuel Tanks
B. If you make a decision not to do this recommended procedure, you must have an approved alternate procedure. Make sure the conditions during the purging and fuel tank entry operations give sufficient protection to the persons and equipment used in this procedure. It is possible that local fire codes, and standards make it necessary to use more restrictive procedures or more procedures than those given in the subsequent steps.
C. The safety, fire and health limits in this procedure are used by Boeing at the manufacturing sites in the state of Washington. For fuel tank and confined space entry, Boeing is required to have an aircraft confined space entry program. This program is established to control the entry into confined spaces to protect the safety and health of persons who go into fuel tanks and other closed areas. Important requirements of the program include:
(1)
Identification and Warning Sign Placement
(2)
Observer Communication with Persons inside Confined Spaces
(3)
Entry Permit Requirements
(4)
Pre-entry Procedures
(5)
Entry Procedures
(6)
Emergency and Rescue Service
(7)
Training
D. It is recommended that a fuel tank entry program which complies with the local, state and national regulations be followed.
TASK 28-10-00-912-503
2. Fuel Tank Purging and Entry Precautions_______________________________________
A. General
(1)
This procedure contains the precautions you must obey before you purge and enter the fuel tanks for maintenance. This task contains these procedures:
(a)
Purging and Fuel Tank Entry - Definitions
(b)
Purging and Fuel Tank Entry - Airplane Precautions
(c)
Purging and Fuel Tank Entry - Electrical Equipment Precautions
(d)
Purging and Fuel Tank Entry - Equipment Precautions
(e)
Purging and Fuel Tank Entry - Personnel Precautions
(f)
Purging and Fuel Tank Entry - Adverse Weather Conditions Precautions
(2)
The next task, Purging and Fuel Tank Entry, contains the steps you must follow to purge and enter a fuel tank.
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28-10-00
ALL ú ú 01 Page 201 ú Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
B. Purging and Fuel Tank Entry - Definitions
S 912-290
(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 912-291
(2) Approved Persons For Fuel Tank Entry:
(a) Persons who are trained and understand the dangers and procedures for fuel tank entry.
S 912-292
(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 912-293
(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.
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