(6)
Connect bonding jumper to actuator assembly.
(7)
Connect electrical plug to actuator assembly. Ensure any slack in wire bundle is used in a drip loop between plug and nearest clamp and not between clamps. If necessary, loosen last three clamps and reposition slack.
532
May 01/00 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-21 Page 401
CAUTION: ENSURE WIRE BUNDLE HAS BEEN PROTECTED FROM CHAFING BY AN OVERWRAP OF TAPE FROM CONNECTOR PLUG TO JUST BEYOND THIRD CLAMP.
NOTE: Tape used for overwrap is applied with 50% overlap.
(8) Check electrical bond between actuator assembly and airplane structure per 20-22-01. Resistance shall not exceed 0.0025 ohm.
E. Restore Airplane to Normal Configuration
(1)
Remove leading edge flap locks (Ref 27-81-0 MP).
WARNING: LEADING EDGE FLAPS ARE FAST ACTING AND CAN CAUSE SERIOUS INJURY TO PERSONNEL.
(2)
Close crossfeed valve circuit breaker on panel P6.
3. Removal/Installation of Crossfeed Valve Gate Assembly
A. Equipment and Materials
(1)
Aliphatic Naphtha - TT-N-95 (Ref 20-30-31)
(2)
Leading Edge Flap Actuator Locks - F80048-89 (Preferred), F80048-90 (Preferred), F80048-84 (Alternate), and F80048-36 (Alternate)
(3)
Lock Assembly, Fuel Boost Pump Bypass Valve - ME-65-16713 (two each)
(4)
Bonding meter (Ref 20-22-01)
(5)
Insulation Tape - MIL-I-23594B (Ref 20-30-51)
501
28-22-21 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/00
504 Crossfeed Valve Installation
Nov 15/67 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-21 Page 403
B. Prepare for Crossfeed Valve Gate Assembly Removal
(1)
On airplanes with boost pump bypass valve with valve lock actuating arm, remove fuel boost pump bypass valve access plugs, for tank No. 1 and 2, and install lock assembly to close bypass valve.
(2)
On ALL EXCEPT airplanes with boost pump bypass valve with valve lock actuating arm, check that there is less than 1,213 pounds of fuel in tanks No. 1 and 2.
(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)
Open crossfeed valve circuit breaker on panel P6.
C. Remove Crossfeed Valve Gate Assembly
(1)
Disconnect electrical plug from valve (Fig. 401).
(2)
Disconnect bonding jumper from valve.
(3)
Place suitable container under valve to catch fuel.
(4)
Remove gate assembly attaching nuts and washers.
(5)
Carefully withdraw gate assembly from opening in front spar and lift clear.
NOTE: If port adapter assembly is not being removed, check that its mounting bolts were not loosened during removal of gate assembly attaching nuts.
D. Install Crossfeed Valve Gate Assembly
(1)
Clean O-ring groove in gate assembly housing and machined surface of front spar with naphtha, wipe dry with lint-free cloth.
(2)
Install new O-ring, lightly lubricated with fuel, into groove on gate assembly housing.
(3)
Carefully insert gate assembly into port adapter, through opening in front spar.
(4)
Install gate assembly attaching nuts and washers. Torque 50-70 pound-inches.
(5)
Connect electrical plug to actuator assembly. Ensure that any slack in wire bundle is utilized in a drip loop between plug and nearest clamp and not between clamps. If necessary, loosen last three clamps and reposition slack.
CAUTION: ENSURE THAT WIRE BUNDLE HAS BEEN PROTECTED FROM CHAFING BY AN OVERWRAP OF TAPE FROM CONNECTOR PLUG TO JUST BEYOND THIRD CLAMP.
NOTE: Tape used for overwrap is applied with 50% overlap.
(6)
Connect bonding jumper to actuator assembly.
(7)
Check electrical bond between actuator assembly and airplane structure per 20-22-01. Resistance shall not exceed 0.0025 ohm.
532
28-22-21 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/86
E. Restore Airplane to Normal Configuration
(1)
On airplanes with boost pump bypass valve with valve lock actuating arm, remove lock assemblies to open fuel boost pump bypass valves and install access plugs.
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