28-44-02
 ALL  ú ú 03 Page 401 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (2)  
Access Panels
 545AB Fuel Tank Access Door
 546BB Fuel Tank Access Door
 553AB Fuel Tank Access Door
 553FB Fuel Tank Access Door
 553KB Fuel Tank Access Door
 645AB Fuel Tank Access Door
 646BB Fuel Tank Access Door
 653AB Fuel Tank Access Door
 653FB Fuel Tank Access Door
 653KB Fuel Tank Access Door

 D.
Procedure

 S 034-002
 (1)
Remove the measuring stick from the housing (AMM 28-44-01/401).

 S 654-003

 (2)  
Defuel the applicable fuel tank (AMM 28-26-00/201).

 S 034-004
 WARNING: OBEY ALL FUEL TANK PRECAUTIONS FOR OPEN FUEL TANKS
_______ (AMM 28-11-00/201). IF YOU ARE NOT CAREFUL, IGNITION OF FUEL GAS COULD OCCUR.
 CAUTION: BE CAREFUL WHEN YOU REMOVE THE HOUSING OF THE MEASURING STICK.
_______ THE HOUSING IS MADE OF FIBERGLASS MATERIAL AND CAN BE EASILY DAMAGED IF YOU BEND IT.
 (3)  
With the hex wrench, loosen and lower the housing through the mounting base.

 S 014-045

 (4)  
Remove the fuel tank access door with the housing from the airplane (AMM 28-11-02/401).

 NOTE: Be careful not to bend the housing during the removal of the
____
 fuel tank access door.

 S 034-005
 (5)  Remove the spring pin which holds the upper float stop on the housing.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-44-02
 ALL  ú ú 01 Page 402 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 034-040
 (6)  
Remove the upper float stop and float from the housing.

 S 024-006

 (7)  
Remove the housing through the mounting base on the fuel tank access door.

 S 034-041

 (8)  
Discard the O-ring.

 TASK 28-44-02-404-061
 3.  Fuel Measuring Stick Housing No. 18, 21, 23, 33, or 34 Installation___________________________________________________________________ (Fig. 401)
 A.  Equipment
 (1)  
Wrench - Hex, 9/16 inch, local purchase

 B.  
Consumable Materials

 (1)  
D00128 Petrolatum - Technical, VV-P-236

 C.  
References

 (1)  
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (2)  
AMM 28-44-01/401, Fuel Measuring Stick

 (3)  
AIPC 28-41-01 Fig. 1

 D.  
Access

 (1)  
Location Zones 545 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 553 Reserve Tank, Front Spar to Rear Spar, Left 645 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right 653 Reserve Tank, Front Spar to Rear Spar, Right

 (2)  
Access Panels
 545AB Fuel Tank Access Door
 546BB Fuel Tank Access Door
 553AB Fuel Tank Access Door
 553FB Fuel Tank Access Door
 553KB Fuel Tank Access Door
 645AB Fuel Tank Access Door
 646BB Fuel Tank Access Door
 653AB Fuel Tank Access Door
 653FB Fuel Tank Access Door
 653KB Fuel Tank Access Door

 E.  
Procedure

 (1)  
Examine the condition of the lower float stop.

 S 214-062
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 28-44-02
 ALL  ú ú 01 Page 403 ú Oct 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

HOUSING NO. 24
SEE A HOUSING NO. 18 SEE B
HOUSING NO. 17 SEE A
HOUSING NO. 21
HOUSING NO. 19
SEE A
SEE A
HOUSING NO. 20
SEE A

HOUSING NO. 22
　
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