(i)
Put the refuel valve switches, MAIN 2 and MAIN 3, to the CLOSED position.
S 014-003
(7)
Remove the wingtip dry bay access door, 556AB or 656AB.
S 034-004
(8)
Disconnect the applicable electrical connector, DV56 (DV49) from the left (right) actuator, V56 (V49).
S 034-005
(9)
Remove the bonding jumper from the actuator.
S 034-006
(10)
Remove the bolts and washers (6 locations).
S 024-007
(11)
Remove the valve body and actuator from the airplane as one unit.
(12)
Discard the packing and the gasket seal.
S 034-008
(13)
If you replace the valve body only, remove the screws and washers (4 locations) that attach the actuator to the valve body.
S 034-036
NOTE: Keep the screws and washers for installation.
____
TASK 28-31-03-404-009
3. Fuel Jettison Nozzle Valve Assembly Installation (Fig. 401)
________________________________________________
A. References
(1) AMM 12-11-01/301, Fuel Tank - Servicing
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28-31-03
ALL ú ú 01 Page 405 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(2)
AMM 20-11-15/401, Bonding Jumpers and Ground Leads
(3)
AMM 20-22-01/601, Electrical Bonding
(4)
AMM 24-22-00/201, Manual Control
(5)
AMM 27-81-00/201, Leading Edge Flap System
(6)
AIPC 28-31-05 Fig. 2
(7)
SSM 28-31-03
(8)
WDM 28-31-13
B.
Access
(1)
Location Zones
556 Dry Bay, Front Spar to Rear Spar, Left
656 Dry Bay, Front Spar to Rear Spar, Right
(2)
Access Panels
556AB Wingtip Dry Bay Access Door
656AB Wingtip Dry Bay Access Door
C.
Install the Fuel Jettison Nozzle Valve Assembly
S 434-010
(1)
If you replace the valve body only, install the screws and washers (4 locations) that attach the actuator to the valve body.
S 434-037
(2)
Install lockwire on the screws.
S 424-011
(3)
Put the fuel jettison nozzle valve assembly with the new packing (outboard side) and gasket seal (inboard side) in its position between the fittings on the fuel jettison manifold (View B).
NOTE: Make sure the arrow on the valve body points in the
____
inboard direction.
S 434-012
(4) Install the bolts and washers (6 locations).
NOTE: Put the bolt with the drilled head in a good location to
____ install lockwire between the tube nut and the bolt head.
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28-31-03
ALL ú ú 01 Page 406 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 434-038
(5)
Install lockwire on the bolts.
S 714-013
(6)
Operate the manual override lever on the actuator to make sure the fuel jettison nozzle valve moves freely.
S 434-014
(7)
Connect the applicable electrical connector, DV56 (DV49), to the left (right) actuator, V56, (V49).
S 434-015
(8)
Install the bonding jumper on the grounding lug of the actuator (AMM 20-11-15/401).
S 764-016
(9)
Make sure the bonding resistance between the actuator and the structure is not more than 0.010 ohm (AMM 20-22-01/601).
S 764-017
(10)
Make sure the bonding resistance between the valve body and the rib web structure is not more than 0.0004 ohm (AMM 20-22-01/601).
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