CAUTION:  BE EXTREMELY CAREFUL WITH CONNECTOR PINS AND/OR SOCKETS. CONNECTOR RECEPTACLE IS PART OF TANK WIRING HARNESS. DAMAGE TO RECEPTACLE WILL NECESSITATE REMOVAL OF COMPLETE ASSEMBLY.

(10)
Reconnect bussing plug to receptacle (Ref 28-48-41 R/I).

(11)
Repeat steps (3) thru (10) for other fuel tanks.

(12)
If extended, remove leading edge flap locks and retract leading edge flaps (Ref 27-81-0 MP).

5C8 
Oct 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-41-21 Page 501 

WARNING:  LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
F95026
Tank Unit and Compensator Unit Test Connections  5C8 
28-41-21  Figure 501  Aug 01/96 
Page 502 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

T52872 T52904
556  Tank and Compensator Unit Capacitance and Resistance Values 
Apr 01/97  Figure 502 (Sheet 1)  28-41-21 
Page 503 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

Tank and Compensator Unit Capacitance and Resistance Values  556 
28-41-21  Figure 502 (Sheet 2)  Apr 01/97 
Page 504 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

TANK UNITS AND COMPENSATOR UNITS - CLEANING/PAINTING
1.  General
A.  This procedure is for cleaning microbial contamination from fuel quantity tank units.
2.  Equipment and Materials
A.  Alcohol
B.  Container with depth suitable for cleaning tank units
C.  Nylon bristle brushes
D.  Bottle-type brush having a bristle outside diameter of 1/4 to 3/8 inch with an extension rod attached and the entire handle and extension covered with plastic or heat shrinkage tubing.
3.  Clean Tank Unit
A.  Remove tank unit (Ref 28-41-21, Removal/Installation).
B.  Thoroughly scrub all surfaces of the tank unit using alcohol only (never water or water and cleaner) and nylon bristle brushes. Use care to prevent scratching tank unit. Ensure that all microbial growth is removed.
WARNING:  USE ALCOHOL IN A WELL-VENTILATED AREA. DO NOT INHALE VAPORS OR USE NEAR AN OPEN FLAME.
CAUTION:  BE CAREFUL WHEN SCRUBBING INNER ELECTRODE NOT TO MOVE OR DISLODGE SPACERS AS CAPACITANCE MEASUREMENT WILL CHANGE.
C.  Thoroughly rinse tank unit with clean alcohol.
D.  Thoroughly wipe dry with clean lint free absorbent material.
E.  Install tank unit (Ref 28-41-21, Removal/Installation).
505 
Feb 15/78  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-41-21 Page 701 

FUEL QUANTITY INDICATING SYSTEM WIRE HARNESS - APPROVED REPAIRS
1.  General
A.  This section contains a procedure for recrimping the in-tank wire harness terminal lugs. Recrimping may be required to provide a tighter lug connection to the wire to assure electrical continuity within the fuel quantity indicating system.
2.  Equipment and Materials
A.  AMP hand-crimping tool - P/N 59250 or 59170
3.  Recrimp Fuel Tank Wire Harness Terminal Lug
A.  Defuel airplane or defuel applicable fuel tank only, and drain sump fuel (Ref 28-23-0 MP).
B.  Remove fuel tank access panels.
(1)  
For the wing tank remove underwing access panels 1, 2, 3, 4, 5, 7, 9, and 10 (Ref 28-11-11 R/I).

(2)  
For the center tank, remove the center tank access panel (Ref\28-11-31 R/I).

C.  Purge applicable fuel tank (Ref 28-10-0 MP).
D.  Enter applicable tank to gain access to fuel compensator.
E.  Disconnect harness terminal leads from compensator.
F.  Loosen or remove harness clamps as necessary to provide length of slack wire.
G.  Remove the captive screw and lockwasher from terminal tongue on the HI-Z wire lead. Retain for installation.
H.  Recrimp the wire harness terminal lug using the AMP hand tool and crimping dies. Verify that end of terminal lug barrel has been deformed by the tool.
I.  Install the captive screw and lockwasher on the terminal tongue.
J.  Repeat steps G. thru I. for recrimping for LO-Z wire lead.
K.  Connect leads and tighten clamp on unit. Tighten screws/nut to following torque ranges: HI-Z lead (COAX) 15-16 pound-inches LO-Z lead (TANK) 19-23 pound-inches Strain relief clamp  7-9 pound-inches
L.  Install and/or tighten any wire harness clamps removed or loosened.
M.  Repeat steps E. thru L. for each tank unit.
　
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