(3)
With one man inside fuel tank supporting port adapter assembly and a second man outside fuel tank, remove port adapter assembly mounting bolts and washers (Fig. 401).
CAUTION: DO NOT ALLOW ADAPTER ASSEMBLY TO FALL, DAMAGE TO WING SKIN OR FUEL TANK SEALING MAY RESULT.
(4)
Slide port adapter assembly from between fuel line flanges and lift clear.
D. Install Engine Fuel Shutoff Valve Port Adapter Assembly
(1)
Clean O-ring grooves and machined surfaces of port adapter, fuel line flanges, and front spar with solvent 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 5.E.(1) thru 5.E.(7) to install gate assembly.
(7)
Install fuel tank access panel (Ref 28-11-11 R/I).
(8)
Leak check and check functional operation of shutoff valve (Ref 28-22-0 A/T).
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28-22-11 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/86
7. Restore Airplane to Normal
A. Remove leading edge flap locks (Ref 27-81-0 MP).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
B. Close engine fuel shutoff valve circuit breakers (P6).
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Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-11 Page 405
FUEL CROSSFEED VALVE - REMOVAL/INSTALLATION
1. General
A. The fuel crossfeed valve is mounted on the left wing front spar. The fuel crossfeed 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.
B. Replacement of the port adapter assembly requires removal of the actuator and gate assemblies and complete defueling of the No. 1 fuel tank.
C. On ALL EXCEPT airplanes with boost pump bypass valve with valve lock actuating arm, replacement of the gate assembly requires that less than 1,213 pounds of fuel be contained in taks No. 1 and 2.
2. Removal/Installation of Crossfeed Valve Actuator Assembly
A. Equipment and Materials
(1)
Grease, Aircraft, High Temperature - MIL-G-3545
(2)
Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
(3)
Bonding meter (Ref 20-22-01)
(4)
Insulation Tape - MIL-I-23594B (Ref 20-30-51)
B. Prepare for Crossfeed Valve Actuator Assembly Removal
(1)
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.
(2)
Open crossfeed valve circuit breaker on aft overhead panel (P6).
C. Remove Crossfeed 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.
D. Install Crossfeed 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 spline in input shaft.
(3)
Insert end of output shaft into input shaft, then carefully slide output shaft into input shaft until actuator mounting flange contacts gate assembly.
CAUTION: TO AVOID DAMAGE TO SPLINED SHAFTS, ACTUATOR ASSEMBLY MUST BE SUPPORTED SO WEIGHT IS NOT ON SHAFT.
(4)
If actuator assembly mounting holes do not line up with mating holes, carefully rotate actuator assembly until holes are aligned.
(5)
Install actuator assembly mounting bolts.
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