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A
747-400
MAINTENANCE MANUAL
REFUEL VALVE
CONTROL UNIT
SEE A
REFUEL VALVE
CONTROL UNIT
SEE A
REFUEL VALVE
CONTROL UNIT
REFUEL VALVE
CONTROL UNIT
SEE A
SEE A
VALVE UNIT
VALVE MOUNTING NUT
UNIT (REF) (3 LOCATIONS)
DO NOT REMOVE
1.
PACKING
ELECTRICAL
2.
PACKING
BONDING
SEE B
FLOW PASSAGE
3. REFUEL VALVE PORT (REF)
CONTROL UNIT
NOTE: THE VIEW SHOWN IS FOR THE WING TANKS. THE VALVE UNITS INSTALLED ON THE CENTER WING TANK REAR SPAR ARE TURNED 90` IN
1. PACKING THE CLOCKWISE DIRECTION.
6. WASHER 4. ELECTRICAL (3 LOCATIONS) CONNECTOR
REAR
SPAR (REF)
5. BOLT (3 LOCATIONS)
REFUEL VALVE CONTROL UNIT
A
Refuel Valve Control Unit
Figure 401 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
VALVE UNIT VALVE UNIT
MOUNTING NUT
(3 LOCATIONS) ELECTRICAL SURFACE
BOND (3 LOCATIONS) 1
RESISTANCE MEASUREMENT
SEE C
FLOW PASSAGE REFUEL VALVE
PORT CONTROL UNIT
REAR SPAR
ELECTRICAL BONDING
B
ELECTRICAL SURFACE BOND
1
RESISTANCE
MEASUREMENT
2 REFUEL VALVE CONTROL UNIT
RESISTANCE
MEASUREMENT
REAR SPAR 3
VALVE UNIT
MOUNTING STUD
VALVE UNIT FWD
RESISTANCE MEASUREMENT
C
1 PREPARE THE FAYING SURFACE OF THE VALVE UNIT MOUNTING STUD AND THE MATING SURFACE OF THE REFUEL VALVE CONTROL UNIT FOR AN ELECTRICAL SURFACE BOND (SWPM 20-20-00).
2 MEASURE RESISTANCE FROM EXPOSED THREADS ON VALVE UNIT MOUNTING STUD TO THE REFUEL VALVE CONTROL UNIT (SWPM 20-20-00).
3 MEASURE RESISTANCE FROM EXPOSED THREADS ON VALVE UNIT MOUNTING STUD TO REAR SPAR STRUCTURE(SWPM 20-20-00).
Refuel Valve Control Unit Figure 401 (Sheet 2)
G85443
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
BOTTOM VIEW
ACCESS OF THE LOWER
691AB 591AB DOOR ACCESS DOOR 581DB WING SURFACE SEE A
681DB
OUTBOARD REFUEL
ACCESS VALVE CONTROL
DOOR UNIT FOR THE
572GB NO. 2 MAIN
672GB TANK
INBOARD REFUEL
REFUEL VALVE VALVE CONTROL
CONTROL UNIT UNIT FOR THE
FOR THE NO. 2 NO. 2 MAIN
RESERVE TANK TANK
REAR SPAR
(REF)
ACCESS
DOOR
571AB
REFUEL VALVE 671AB
CONTROL UNIT
FOR THE NO. 1
MAIN TANK
_____NOTES: THE 600 NUMBER SERIES THE 500 NUMBER SERIES ARE USED WITH THE RIGHT WING ARE USED WITH THE LEFT WING FWD INBD 0.0 BBL
(LEFT SIDE SHOWN, RIGHT SIDE OPPOSITE) BOTTOM VIEW OF THE LOWER WING SURFACE
A
Figure 402 Access to the Refuel Valve Control Units
E88961
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