(2)  
Leak-check and check functional operation of crossfeed valve (Ref 28-22-0 A/T).

(3)  
Remove leading edge flap locks (Ref 27-81-0 MP).

WARNING:  LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.

(4)  
Close crossfeed valve circuit breaker on panel P6.

4.  Removal/Installation of Crossfeed Valve Port Adapter Assembly
A.  Equipment and Materials
(1)  
Aliphatic Naphtha - TT-N-95 (Ref 20-30-31)

(2)  
Leading Edge Flap Actuator Locks - F80048-36

(3)  
Lock Assembly - Fuel Boost Pump Bypass Valve - ME-65-16713 (two each)

B.  Prepare for Crossfeed Valve Port Adapter Removal
(1)  
Defuel and purge fuel tank No. 1 (Ref 28-23-0 and 28-10-0 MP).

(2)  
On airplanes with boost pump bypass valve with valve lock actuating arm, remove fuel boost pump bypass valve access plugs, for tanks No. 1 and 2, and install lock assemblies to close bypass valves.

(3)  
Extend flaps and install leading edge flap locks (Ref 27-81-0 MP).

WARNING:  REFER TO 27-81-0 MP FOR LOCK INSTALLATION PROCEDURE. FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.

(4)  
Remove fuel tank No. 1 access panel No. 1 to provide access to rear of wing front spar (Ref 28-11-11 R/I).

C.  Remove Crossfeed Valve Port Adapter Assembly
(1)  
Perform steps 3.C.(1) thru 3.C.(5) to remove gate assembly.

(2)  
Gain access to valve through access panel No. 1 and rib access opening No. 2. Remove bolts attaching fuel line flanges to port adapter assembly.

(3)  
With one man inside fuel tank, supporting port adapter assembly, second man, outside fuel tank, remove port adapter assembly mounting bolts and washer (Fig. 401).

(4)  
Slide port adapter assembly from between fuel line flanges and lift clear.

CAUTION:  DO NOT ALLOW ADAPTER ASSEMBLY TO FALL, DAMAGE TO WING SKIN OR FUEL TANK SEALING MAY RESULT.
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Oct 20/84  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-22-21 Page 405 

D.  Install Crossfeed Valve Port Adapter Assembly
(1)  
Clean O-ring grooves and machined surfaces of port adapter, fuel line flanges, and front spar with naphtha and wipe dry with lint-free cloth.

(2)  
Install new O-rings, lightly lubricated with fuel into grooves on port adapter assembly.

(3)  
Carefully slide port adapter assembly into position between fuel line flanges.

CAUTION:  DO NOT DISLODGE OR PINCH. O-RING WHEN INSERTING PORT ADAPTER ASSEMBLY.

(4)  
Install bolts attaching fuel line flanges to adapter assembly.

(5)  
From outside fuel tank, install port adapter assembly mounting bolts and washers and torque 100 to 140 pound-inches.

(6)  
Perform steps 3.D.(1) thru 3.D.(7) to install gate assembly.

E.  Restore Airplane to Normal Configuration
(1)  
Install fuel tank access panel (Ref 28-11-11 R/I).

(2)  
Perform steps 3.E.(1) thru 3.E.(4).

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APU FUEL VALVE - REMOVAL/INSTALLATION
1. General
A.  The APU fuel valve is mounted on the left wing rear spar in the wheel well. The APU fuel valve is composed of two major assemblies: actuator assembly and valve body assembly. The actuator assembly is bolted to a mounting adapter and may be replaced separately. Replacement of the valve body assembly requires removal of the actuator assembly and mounting adapter and complete defueling of the No. 1 fuel tank.
2.  Removal/Installation of APU Fuel Valve Actuator Assembly
A.  Equipment and Materials
(1) 
 Grease, MIL-G-3545

(2)  
Bonding meter (Ref 20-22-01 I/C)

B.  Remove APU Fuel Valve Actuator Assembly
(1)  
Open APU CONT circuit breaker on P6 panel.

(2)  
Disconnect electrical plug from valve (Fig. 401).

(3)  
Disconnect bonding jumper from valve.

(4)  
Support actuator assembly and remove mounting screw.

CAUTION:  IF ACTUATOR ASSEMBLY IS NOT SUPPORTED WHEN REMOVING SCREW THE KEYED SHAFT MAY BE DAMAGED.

(5)  
Carefully slide actuator assembly away from mounting adapter until output shaft is clear of mating part; lift actuator assembly clear.

C.  Install APU Valve Actuator Assembly
(1)  
Lightly coat keyway of output shaft with grease.

(2)  
Align actuator assembly output shaft keyway with valve body assembly input shaft key. Rotate output shaft until keyway lines up with key in input shaft, then carefully slide output shaft into input shaft until actuator mounting lugs contact mounting adapter.
　
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