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747-400
MAINTENANCE MANUAL

INSTRUMENT 
CONTROL  PANEL 
PANEL  SEE  B 
ALARM  PROBE 
ATTACHMENT 
SEE  A 
EXHAUST PORT 
CHARGER/REMOTE 
ALARM JACK 
CONNECTOR 

SAMPLING LINE
PROBE
%LEL/PPM  % OXY 
PROBE ATTACHMENT 
000  23.8  A 
WARN 

INSTRUMENT PANEL
B

Combustible Gas Indicator (Example)
Figure 205

G54188
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747-400 MAINTENANCE MANUAL
EXAMPLE OF A WET FUEL CELL PRE-ENTRY CHECKLIST
This checklist must be completed prior to start of wet fuel cell entry and/or at shift change PRIOR to work assignment for the continuation of tank work started by a previous shift.
Wet Fuel Cell Entry Location

Shift: ________ Date: ________ Supervisor: ___________________________________ Area or Building: ________ Stall: ________ Airplane: ________ Tank: ________ 
Shop personnel entering cells and standby observers have current "fuel cell entry" excessive odors are noted, all work shall stop and fuel cells must be evacuated. If ventilation system fails or any ill effects such as dizziness, irriation, or Ventilation system must remain in operation at all times while fuel cells are open.____NOTE: __________________________ Signature of Supervisor or Designee _______________________________________________ I confirm that all entry requirements were met prior to any entry. Meter Readings Combustible gas meter (LEL) reading: _________________________ By (FD): ___________________ Fuel vapor level reading (ppm): _________________________ By: _____________________________ Oxygen reading (%): _________________________ By: __________________________________________ Date 17. 16. 15. Fire Department notified.14. 13. . . . Respirator Use and Maintenance Aircraft Confined Space Entry Safety certification cards. Certification requires the following training: Wet Fuel Cell Entry fuel cells. Mechanical ventilation (venturis or blowers as necessary) installed to ventilate all open No power on airplane: battery disconnected, external Power Cord disconnected from airplane, Sponges available for residual fuel mop out.10. 12. 11. All plugs used have streamers attached. Aerators checked for cleanliness prior to use. approved coveralls, caps and foot coverings, and eye protection. including appropriate personal protective equipment: OSH class 110 respirator at a minimum, Ensure requirements listed on Aircraft Confined Space Entry Permit are complied with, and external power receptacle placarded. 1. 9. 8. Trained attendant and confined space logsheet required for all wet fuel cell entries. 7. blowers, pressure and test equipment, etc.). 6. 5. Only approved explosion proof equipment and tools will be used for fuel cell entry (lights, 3. Boost pump switches off and circuit breakers pulled and placarded. 4. 2. Area secured and warning signs positioned. Airplane and adjacent equipment properly grounded. Radio and radar equipment off (see separation distance requirements).

Fuel Tank Pre-Entry Checklist (Example)
Figure 206

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747-400 MAINTENANCE MANUAL
 (c)  
Prepare the Venturi Type Ventilation Equipment for Purging

 (d)  
Prepare the Air Blower Type Ventilation Equipment for Purging

 (e)  
Prepare the Heater/Air Blower Equipment for Purging

 (f)  
Prepare the Combustible Gas Indicator for Purging

 (g)  
Fuel Tank Purging

 (h)  
Fuel Tank Entry

 (2)  
Make sure you read and obey the precautions in this task: Purging and Fuel Tank Entry Precautions.

 B.
References

 (1)  
AMM 09-11-00/201, Towing
　
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