S 014-040
(5)
Open these access doors:
(a)
Refuel control panel access door, 521CB.
(b)
Refuel station access door, 521BB.
S 024-007
(6)
Remove the fuel quantity indicators from the refuel control panel, P42 (AMM 28-41-04/401).
S 034-008
(7)
Remove the six bolts and washers that attach the refuel control panel to the two support brackets (Fig. 401).
S 034-009
(8)
Carefully lower the refuel control panel to get to the electrical connectors.
S 034-041
(9)
Disconnect all of the electrical connectors.
(a)
Attach tags to the electrical connectors to make sure the installation of the refuel control panel is easier.
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747-400 MAINTENANCE MANUAL
S 034-010
(10)
Remove the nut, bolt and washer (2 locations) to disconnect the two bonding jumpers from the bottom right corner of the refuel control panel.
S 024-011
(11)
Remove the refuel control panel from the airplane.
TASK 28-21-16-404-012
3. Refuel Control Panel, P42 Installation (Fig. 401)______________________________________
A. References
(1)
AMM 12-11-01/301, Pressure Fueling
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 27-81-00/201, Leading Edge Flap System
(4)
AMM 28-21-00/501, Pressure Fueling System
(5)
AMM 28-41-04/401, Fuel Quantity Indicator
(6)
SRM 51-20-01, Protective Treatment of Metallic and Graphite Materials
B.
Access
(1)
Location Zones
521 Leading Edge to Front Spar, Left
(2)
Access Panels
521BB Refuel Station Access Door
521CB Refuel Control Panel Access Door
C.
Procedure
S 124-020
(1)
Use a rotary bonding brush to clean the refuel control panel, P42, at the locations where the two bonding jumpers are installed (AMM 20-11-14/701).
S 414-013
(2)
Put and hold the refuel control panel near the location where the panel is to be installed.
S 434-014
(3)
Tighten the bolts, washers, nuts and bonding jumpers to the refuel control panel (Fig. 401).
S 374-023
(4)
Apply alodine to protect the aluminum that does not have a finish (SRM 51-20-01).
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747-400
MAINTENANCE MANUAL
(5) S 414-019Install the electrical connectors (remove the identification tags).
(6) S 414-015Put the refuel control panel into the correct position.
(7) S 434-016Keep the electrical wires a minimum distance of 0.5 inches from the air duct.
(8) S 424-017Align the refuel control panel with the six support bracket nutplates.
(9) S 424-018Install the bolts and the washers (six locations).
S 764-022
(10)
Do a check of the bonding resistance between the refuel control panel and the airplane structure (AMM 20-22-01/601).
(a)
Make sure the resistance is not more than 0.010 ohms.
S 424-033
(11)
Install the fuel quantity indicators (AMM 28-41-04/401).
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