WING SKIN A-A
Typical Effect of Isolation SealFigure 16
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FUEL TANKS - MAINTENANCE PRACTICES
__________________________________
 1.  General_______
 A. The Fuel Tank - Maintenance Practices Procedure contains these tasks:
 (1)  
Purging and Fuel Tank Entry Precautions

 (2)  
Purging and Fuel Tank Entry

 (3)  
Fuel Tank Closure

 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

 D.  
It is recommended that a fuel tank entry program which complies with the local, state and national regulations be followed.

 TASK 28-11-00-912-515
 2.  Purging and Fuel Tank Entry Precautions_______________________________________
 A.  General
 (1)  
This task 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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
CLASS I, CLASS I,
DIVISION 2 10 FEET DIVISION 2
5 FEET

5 FEET
50 FEETCLASS I, CLASS I, DIVISION 1 DIVISION 1
18 INCHES 5 FEET 5 FEET
STALL BOUNDRY CLASS I,
OR DIVISION 1 50 FEET
50 FEET
CLASS I,
DIVISION 1,
0-18 INCHES
ABOVE GROUND

LEGEND
HAZARDOUS
LOCATIONS

Hazardous Locations - Open Fuel Tank(s)
Figure 201

G54122
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A

747-400
MAINTENANCE MANUAL

DO NOT PUT SHARP TOOLS IN THE FUEL TANK
CLEAN 100% COTTON CAP (WITHOUT VISOR)
OVERALLS POCKETS UNDER TEE SHIRTS WITHOUT SHORTS AND COTTON WEAR ONLY COTTON 
　
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