(2)
AIPC 28-21-03, Fig. 1
B.
Access
(1)
Location Zones 544 Inbd Main Tank (Part), Mid Spar to Rear Spar, Left 644 Inbd Main Tank (Part), Mid Spar to Rear Spar, Right
(2)
Access Panels
544AB Fuel Tank Access Door
644AB Fuel Tank Access Door
C.
Procedure
S 434-007
(1)
Put a new O-ring on the drain valve.
(2)
Install the drain valve into the fuel tube.
S 434-014
(3)
Install the lockwire between the drain valve and the adjacent coupling on the fuel jettison manifold.
(4)
Go out of and close the fuel tank (AMM 28-11-00/201).
S 424-008
S 864-009
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A
747-400
MAINTENANCE MANUAL
Manifold Drain Valve Installation
Figure 401
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28-21-03
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
FUELING POWER CONTROL SWITCH - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. This procedure contains instructions to remove and install these
components:
(1)
Fueling power control switch S681
(2)
Magnetic actuator
B.
The switch is installed on the access door for the refuel control panel, 521CB.
C.
Open the access door for the refuel control panel, 521CB, to get access to the fueling power control, S681.
D.
When persons are in the area of the wing leading edge, make sure the safety locks are installed on all extended leading edge flaps.
E.
If the magnetic actuator is missing or misaligned it is possible that the fueling control switch will not operate. As a work-around procedure, some operators have put a magnet on the control switch to complete the circuit. In some cases, the magnet is left in place after the refuel operation and during flight. This procedure is not authorized. With a magnet on the fueling control switch and the airplane on the ground, the fuel quantity processor is constantly in refuel mode. This condition can cause an incorrect fuel system configuration and incorrect logic input for the EICAS advisory messages, FUEL TANK/ENG and X FEED CONFIG. Before you close the refuel control panel door, make sure a magnet is not installed on the fueling control switch.
TASK 28-21-04-004-001
2. Fueling Power Control Switch Removal (Fig. 401)____________________________________
A. References
(1)
AMM 27-81-00/201, Leading Edge Flap System
(2)
AIPC 28-21-24, Fig. 1
(3)
SSM 28-21-01
(4)
WDM 28-21-11, 28-21-12
B.
Access
(1)
Location Zone
521 Leading Edge to Front Spar, Left
(2)
Access Panel
521CB Fueling Control Panel Access Door
C.
Procedure
S 864-002
(1)
Open these circuit breakers and attach the DO-NOT-CLOSE tags:
(a)
On the DC power distribution panel, P180: 1) 180M9, FUELING PWR - HOT BAT 2) 180C25, FUELING LTS PANEL 3) 180C26, FUELING LTS RECP
(b)
On the left power distribution center, P414: 1) 414F22, FUELING PWR
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