(21)
Check fuel truck or hydrant system flow indicator and tank No. 1 fueling quantity indicator to verify that fuel has started.

(22)
Continue fueling tank until DC float switch closes fueling shutoff valve.

(23)
Place No. 1 tank fueling shutoff valve switch to CLOSE.

(24)
Repeat steps (20) thru (23) for remaining tanks.

538 
Feb 20/94  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-21-0 Page 501 

B. Restore Airplane to Normal Configuration
(1)
Stop fueling truck or hydrant flow.

(2)
Disconnect fueling hose grounding jack and fueling hose; in that order.

(3)
Replace receptacle cap and wipe up any spilled fuel at fueling station.

(4)
Close fueling station access door.

(5)
Remove electrical power if no longer required.

526 
28-21-0 Page 502  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/99 

FUELING RECEPTACLE - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Aliphatic naphtha
2.  Prepare Fueling Receptacle for Removal
A.  Open fueling station access door.
B.  Check that manual defueling valve is closed.
C.  Remove electrical power from airplane.
D.  Pull circuit breakers for fueling shutoff valves and fuel quantity indicators on P6 circuit breaker panel.
E.  Remove receptacle cap (Fig. 401).
F.  With suitable container under receptacle, press poppet valve in receptacle and allow all residual fuel to drain from receptacle and manifold.
3.  Remove Fueling Receptacle
A.  Remove mounting screws from fueling hose adapter.
B.  Pull fueling hose adapter straight down until valve is clear of manifold.
4.  Prepare Fueling Receptacle for Installation
A.  Clean all machined surfaces and O-ring grooves on manifold and fueling hose adapter with naphtha and wipe dry with lint-free cloth.
B.  Fit new O-ring, lightly lubricated with fuel, into groove on fueling hose adapter (Fig. 401).
508 
Feb 15/68  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-21-12 Page 401 

5.  Install Fueling Receptacle
A.  Insert valve of fueling hose adapter into manifold. Rotate adapter until bolt holes align with holes in manifold.
CAUTION: DO NOT DISLODGE OR PINCH O-RING WHEN ROTATING ADAPTER.
B.  Install fueling hose adapter mounting screws. Tighten all screws equally, keeping flanges of adapter and manifold parallel to each other.
C.  Press poppet valve and check that valve opens without binding. Check that valve closes easily when upward pressure is removed.
D.  Install receptacle cap.
E.  Close fueling station door.
500 
28-21-12 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 15/68 

500  Fueling Receptacle Installation 
Feb 15/68  Figure 401  28-21-12 
Page 403 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

FUELING MANIFOLD -REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Aliphatic naphtha
B.  Bonding meter (Ref 20-22-01, I/C)
2.  Prepare Fueling Manifold for Removal
A.  Remove electrical power from airplane.
B.  Pull circuit breakers for fueling shutoff valves and fuel quantity indicators on P6 circuit breaker panel.
C.  Open fueling station access door (Fig. 401).
(1) Remove pin attaching outboard linkage assembly to fueling station access door.
D.  Check that manual defueling valve is closed.
E.  Evacuate fuel from manifold.
(1)  
Remove receptacle cap.

(2)  
With suitable container under receptacle, press poppet valve in receptacle and allow residual fuel to drain from receptacle and manifold.

(3)  
Install receptacle cap.

F.  Disconnect electrical plug from fueling shutoff valves.
508 
Sep 01/02  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-21-22 Page 401 

3.  Remove Fueling Manifold
A.  Disconnect bonding jumper from fueling shutoff valves and manifold (Fig. 401).
B.  Remove fueling shutoff valves (Ref 28-21-52, Removal/Installation).
NOTE:  If fueling receptacle is to be removed, refer to 28-21-12, Fueling Receptacle -Removal/Installation.
C.  Remove bolts attaching manifold to check valve and elbow assembly.
　
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