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

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

(e)  
Remove electrical power if no longer needed (Ref 24-22-0 MP).

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5C1 May 01/01 28-22-0
Page 519
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

ENGINE FUEL FEED SYSTEM - CLEANING/PAINTING
General
A.  This procedure is used to flush the engine fuel feed system fuel lines.
2.  Engine Fuel Feed System Fuel Line Flushing
A.  Equipment and Materials
(1)  
Catch Tank - 55 gallon - one each engine

(2)  
Catch Tank - 5 gallon - suitable for draining engine fuel feed lines.

(3) 
 Adapter, MS24398-16-6

(4)  
Hose - 3/8 inch - length suitable to reach catch tank

B.  Prepare for Flushing
(1)  
Ensure that engine fuel shutoff valves and crossfeed valve are open.

(2)  
Drain engine fuel feed lines into 5 gallon container by opening fuel filter drain port. Close drain port and lockwire (Ref 71-00 R/I).

(3)  
Disconnect each engine fuel feed hose at its lower end. Install adapter and route hose  to 55 gallon catch tank.

(4)  
Check that boost pump switches on P5 panel are in OFF position.

(5)  
Check that circuit breakers FUEL CONT NO. 1 AFT NO. 2 FWD, CTRL, FUEL CONT NO. 1 FWD, NO. 2 AFT, and CTR R on P6 panel are closed.

C.  Flush Engine Fuel Feed System Fuel Lines
(1)  
Provide electrical power (Ref 24-22-0 MP).

(2)  
Position each boost pump switch to ON, one at a time, for 10 seconds.

WARNING:  OPERATING ANY BOOST PUMP FOR LONGER THAN 10 SECONDS MAY OVERFILL CATCH TANK.
D.  Restore Airplane to Normal
(1)  
Remove electrical power if no longer required.

(2)  
Remove adapter and hose, and reconnect engine fuel feed hoses.

500 
Jun 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  28-22-0 Page 701 

ENGINE FUEL SHUTOFF VALVE - REMOVAL/INSTALLATION
1. General
A.  Removal/installation of both engine fuel shutoff valves is the same, the only difference being location. The No. 1 engine fuel shutoff valve is mounted on the left wing front spar and No. 2 on the right wing front spar.
B.  The fuel shutoff valve is composed of three major assemblies: actuator assembly, gate assembly, and port adapter assembly. The actuator assembly is bolted to the gate assembly and may be replaced separately or with the gate assembly as an assembled unit.
C.  Replacement of the port adapter assembly requires removal of the actuator and gate
assemblies and complete defueling of the applicable fuel tank.

D.  On ALL EXCEPT airplanes with boost pump bypass valve with valve lock actuating arm, replacement of the gate assembly requires that less than 1,348 pounds of fuel be contained in applicable tank.
2.  Equipment and Materials
A.  Grease, Aircraft, High Temperature - MIL-G-3545 (Ref 20-30-21)
B.  Leading Edge Flap Actuator Locks - F80048-36
C.  Cleaning Solvent - Aliphatic Naphtha TT-N-95 (Ref 20-30-31)
D.  Lock Assembly Fuel Boost Pump Bypass Valve - ME65-16713
E.  Bonding meter (Ref 20-22-01)
3.  Prepare for Removal
A.  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.
B.  Open engine fuel shutoff valve circuit breakers (P6).
4.  Removal/Installation of Engine Fuel Shutoff Valve Actuator Assembly
A.  Remove Engine Fuel Shutoff Valve Actuator Assembly
(1)  
Disconnect electrical plug from valve (Fig. 401).

(2)  
Disconnect bonding jumper from valve.

(3)  
Support actuator assembly and remove mounting bolts.

CAUTION:  IF ACTUATOR ASSEMBLY IS NOT SUPPORTED WHEN REMOVING BOLTS, THE SPLINED SHAFTS MAY BE DAMAGED.

(4)  
Carefully slide actuator assembly away from gate assembly until output shaft is clear of mating part; lift actuator assembly clear.

B.  Install Engine Fuel Shutoff Valve Actuator Assembly
(1)  
Lightly coat splines of output shaft with grease.

(2)  
Align actuator assembly output shaft with gate assembly input shaft, rotate output shaft until index spline lines up with index spline in input shaft.
　
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