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D.  Support manifold and remove bolts attaching manifold to leading edge support members.
E.  Withdraw manifold assembly through fueling station access door.
4.  Prepare Fueling Manifold for Installation
A.  Clean machined surfaces of manifold, O-ring groove of check valve and elbow assemblies with naphtha; wipe dry with lint-free cloth.
B.  Install new O-ring, lightly lubricated with fuel, on check valve and elbow assemblies.
5.  Install Fueling Manifold
A.  Position manifold between leading edge support members and insert support bolts finger-tight.
CAUTION: DO NOT DISLODGE OR PINCH O-RING.
NOTE:  Do not install washers on support bolts at this time.
B.  Insert bolts attaching manifold to check valve and elbow assemblies. Tighten all bolts equally.
C.  Remove support bolts and reinstall with plain and shim washers.
NOTE:  Use shim washers as required to prevent straining manifold or leading edge support members when bolts are tightened.
D.  Connect bonding jumper to fueling shutoff valves and manifold.
E.  Check electrical bond between manifold and airplane structure per 20-22-01, I/C. Resistance shall not exceed 0.0010 ohm.
500 
28-21-22 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/84 

500  Fueling Manifold Installation 
Feb 15/68  Figure 401  28-21-22 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

6. Restore Airplane to Normal Configuration
A. Connect the electrical plug to the fueling shutoff valves.
B. Install the fueling shutoff valve (AMM 28-21-52/401). 
C. Install the fueling receptacle if it is removed (AMM 28-21-12/401).
D. Install the pin and washers that attach the linkage assembly to the access door.
500 
28-21-22  Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Sep 01/02 

FUELING CHECK VALVE - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Aliphatic naphtha
2.  Remove Check Valve
A.  Defuel applicable fuel tank for check valve removal. Refer to 28-23-0, Defueling.
B.  Check that manual defueling valve is closed.
C.  Remove manifold. Refer to 28-21-22, Fueling Manifold - Removal/Installation.
D.  Place suitable container under check valve to catch fuel drip.
E.  Remove screws attaching check valve. (See figure 401.)
F.  Remove check valve.
3.  Install Check Valve
A.  Clean machined surface of body assembly and O-ring groove of check valve with naphtha; wipe dry with lint-free cloth.
B.  Install new O-ring, lightly lubricated with fuel, on check valve (side with poppet valve).
C.  Place check valve on body assembly and rotate until screw holes align with holes in body assembly.
CAUTION: DO NOT DISLODGE OR PINCH O-RING WHEN ROTATING CHECK VALVE.
D.  Install check valve mounting screws. Tighten all screws equally, keeping check valve parallel to flange of body assembly.
E.  Install manifold. Refer to 28-21-22, Fueling Manifold - Removal/Installation.
508 
Feb 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-21-32 Page 401 

Fueling Check Valve Installation  500 
28-21-32  Figure 401  Nov 15/69 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FUELING BODY OR ELBOW ASSEMBLY - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Aliphatic Naphtha - TT-N-95
2.  Remove Body or Elbow Assembly
A.  Defuel and purge fuel tank No. 2. In addition, defuel applicable fuel tank for removal of CTR or No. 1 body assembly. Refer to 28-23-0, Defueling - Maintenance Practices and 28-10-0, Fuel Storage System - Maintenance Practices.
B.  Remove fueling manifold. Refer to 28-21-22, Fueling Manifold - Removal/Installation.
C.  Remove fuel tank access panels in fueling station area to provide access to rear of wing front spar. Refer to 28-11-11, Fuel Tank Access Panel - Removal/Installation.
D.  With one man removing applicable fueling or defueling line and body or elbow assembly mounting nut and washer at rear of front spar, second man, located outside fuel tank, support and remove body or elbow assembly. (See figure 401.)
3.  Install Body or Elbow Assembly
A.  Clean O-ring grooves of body or elbow assembly and both sides of front spar opening with naphtha, wipe dry with lint-free cloth.
　
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