(1)
Defuel the applicable fuel tank (AMM 28-26-00/201).

 S 654-002
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 S 864-016
 CAUTION:_______OBEY THE FUEL TANK PURGING AND ENTRY PRECAUTIONS. YOU CAN CAUSE INJURY TO PERSONS AND DAMAGE TO THE AIRPLANE.
 (2)  
Do the purge and entry of the fuel tanks tasks (AMM 28-11-00/201).

 S 014-004

 (3)  
For the densitometer in the center wing tank, remove the access doors in the spanwise beam, 131AZ and 131BZ (AMM 28-11-09/401).

 S 034-005

 (4)  
Remove the nuts that attach the terminals of the FQIS wire bundles to the terminal studs.

 S 034-017

 (5)  
Remove the terminals from the densitometer.

 S 024-006

 (6)  
Remove the screws, washers, and nuts (4 locations) that attach the densitometer to the mounting bracket.

 S 554-027

 (7)  
Do not put your fingers in or allow objects to touch the center hole in the densitometer.

 NOTE: The center hole in the densitometer is made of soft material
____ which can damage easily. If the surface of the center hole is scratched, it is possible that the densitometer calibration can change.
 S 024-026
 (8)  Remove the densitometer from the airplane.
 TASK 28-41-11-404-007
 3.  The Fuel Quantity Densitometer Installations (Fig. 401)____________________________________________
 A. Equipment
 (1)  
Bonding Meter (SWPM 20-20-00) Approved for use in fuel vapor area.

 B.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 28-11-00/201, Fuel Tanks

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

 (4)  
AIPC 28-41-03 Fig. 1

 (5)  
AIPC 28-41-03 Fig. 5

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CENTER WING TANK
NO. 2 MAIN TANK
FUEL QUANTITY DENSITOMETER
SEE A
NO. 1 MAIN
TANK

NUT WASHER
(4 LOCATIONS) (4 LOCATIONS)
TERMINAL
BLOCK

SEE B WASHERSCREW (4 LOCATIONS)(4 LOCATIONS)
NUT (8 LOCATIONS)
TOP
SENSE

KR0
TERMINAL POST (8 LOCATIONS)
KRSENSE 1
SHLD
FUEL QUANTITY DENSITOMETER
KR
DRIVE

2
A
KR3
DRIVE
FQIS WIRE FQIS WIRE BUNDLE BUNDLE
TERMINAL BLOCK
B
Fuel Quantity Densitometer Installation
Figure 401

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 (6)  
SWPM 20-20-00, Electrical Bond and Ground

 (7)  
SSM 28-41-03, 28-41-04, 28-41-05

 (8)  
WDM 28-41-21, 28-41-22, 28-41-23, 28-41-24

 C.
Access

 (1)  
Location Zones 131 Center Section Wing Box, Left 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 546 Outbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right 646 Outbd Main Tank (Part), Mid Spar to Rear Spar, Right

 (2)  
Access Panels
 131AZ Spanwise Beam Access Door
 131BZ Spanwise Beam Access Door

 D.
Procedure

 S 164-030
 (1)  
Prepare the faying surface of the densitometer and the tank
 structure for a faying surface bond (SWPM 20-20-00).
　
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