HOUSING NO. 23
SEE A HOUSING NO. 33 SEE A
HOUSING NO. 34
SEE A
UPPER SPRING PIN UPPER GUIDEFLOAT STOP FLOAT FLOAT
HOUSING OF THE
HOUSING OF THE
MEASURING STICK

MEASURING STICKLOWER
LOWER FLOAT
FLOATMOUNTING BASE MOUNTING BASESTOP STOP
O-RING O-RING
MEASURING
MEASURING STICK (REF) STICK (REF) HOUSING NO. 17,19-24,33,34 HOUSING NO. 18 AB
Fuel Measuring Stick Housing
Figure 401

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A
747-400 MAINTENANCE MANUAL
 (2)  S 964-059Replace the lower float stop if it is damaged.
 (3)  S 164-063Clean the inner surfaces of the mounting base.
 (4)  S 434-064Install a new O-ring, lightly lubricated with petrolatum, on the farthest groove from the threads on the housing.
 S 424-052

 CAUTION: BE CAREFUL WHEN YOU INSTALL THE HOUSING OF THE MEASURING STICK.
_______ THE HOUSING IS MADE OF FIBERGLASS MATERIAL AND CAN BE EASILY DAMAGED IF YOU BEND IT.
 (5)  Put the housing through the mounting base in the fuel tank access door.
 NOTE: Do not tighten the housing in the mounting base.
____
 S 434-065
 (6)  
Install the float and upper float stop on the housing. S 434-060

 (7)  
Install the spring pin to attach the upper float stop to the housing.

 S 414-054 CAUTION: MAKE SURE THE TOP END OF THE HOUSING GOES IN THE GUIDE WHEN YOU
_______ INSTALL THE FUEL TANK ACCESS DOOR WITH THE HOUSING NO. 18. IF THE HOUSING IS NOT IN THE GUIDE, THE HOUSING COULD BE DAMAGED.
 (8)  
Install the fuel tank access door (AMM 28-11-02/401). S 424-055

 CAUTION:_______DO NOT TIGHTEN THE HOUSING TOO MUCH. DAMAGE TO THE HOUSING COULD OCCUR IF YOU TIGHTEN IT TOO MUCH.

 (9)  
Tighten the housing in the mounting base, with a hex wrench, to 30-40 pound-inches.

 S 434-066

 (10)
 Install the fuel measuring stick (AMM 28-44-01/401).

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747-400 MAINTENANCE MANUAL
 TASK 28-44-02-004-067
 4.  Measuring Stick Housing No. 17, 19, 20, 22, and 24 Removal (Fig. 401)__________________________________________________________
 A. Equipment
 (1)
Wrench - Hex, 9/16 inch, local purchase

 B.
References

 (1)
AMM 28-11-00/201, Fuel Tanks

 (2)
AMM 28-11-02/401, Reserve and Main Tank Access Door

 (3)
AMM 28-11-09/401, Spanwise Beam Access Door

 (4)
AMM 28-26-00/201, Defueling

 (5)
AMM 28-44-01/401, Fuel Measuring Stick

 (6)
AIPC 28-41-01 Fig. 1

 C.
Access

 (1)  
Location Zones 131 Center Section Wing Box, Left 541 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 542 Inbd Main Tank (Part), Front Spar to Mid Spar, Left 543 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 551 Outbd Main Tank (Part), Front Spar to Mid Spar, Left 641 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 642 Inbd Main Tank (Part), Front Spar to Mid Spar, Right 643 Outbd Main Tank (Part), Front Spar to Mid Spar, Right 651 Outbd Main Tank (Part), Front Spar to Mid Spar, Right

 (2)  
Access Panels
 131AZ Spanwise Beam Access Door
 546BB Fuel Tank Access Door
 552DB Fuel Tank Access Door
 646BB Fuel Tank Access Door
 652DB Fuel Tank Access Door

 D.
Procedure

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

 S 034-008
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