S 014-004
(3)
Open the access door for the refuel control panel, 521CB.
S 034-005
(4)
Disconnect the leads for the fueling power control switch from the airplane leads.
S 034-006
(5)
Remove the screw and nut (2 locations) that attach the switch to the bracket.
S 024-007
(6)
Remove the switch.
TASK 28-21-04-404-008
3. Fueling Power Control Switch Installation (Fig. 401)
_________________________________________
A. Consumable Materials
(1)
A00250 Adhesive - BMS 5-26, Class B-1/2
B.
References
(1)
AMM 20-11-14/701, Metal Surfaces
(2)
AMM 24-22-00/201, Manual Control
(3)
AMM 27-81-00/201, Leading Edge Flap System
(4)
AIPC 28-21-24, Fig. 1
(5)
SSM 28-21-01
(6)
WDM 28-21-11, 28-21-12
C.
Access
(1)
Location Zone
521 Leading Edge to Front Spar, Left
(2)
Access Panel
521CB Fueling Control Panel Access Door
D.
Install the Fueling Power Control Switch
(1)
Put the switch on the bracket.
S 434-010
(2)
Install the screw and nut (2 locations) that attach the switch to the bracket.
S 424-009
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28-21-04
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
REFUEL CONTROL PANEL
SEE A
LEFT WING REFUEL STATION
A
MAGNETIC
ACTUATOR SWITCH LEADS
DOOR STOP
FITTING
FUELING POWER CONTROL SWITCH
REFUEL
CONTROL
PANEL
FWD INBDDOOR
FUELING POWER CONTROL SWITCH (DOOR PARTIALLY OPEN)
B
1 APPLY ADHESIVE (BMS 5-26 CLASS B-1/2) TO THE MATING SURFACE OF THE BRACKET, MAGNETIC ACTUATOR AND DOORSTOP FITTING.
FUELING POWER CONTROL SWITCH
SEE B INBD
FWD
REFUEL CONTROL PANEL
A
A
0.22
0.19 INCHES WIRING0.19
MAGNETIC
ACTUATOR
SCREW FUELING POWER
NUT CONTROL SWITCH
(2 LOCATIONS)
SCREW
BRACKET NUT (2 LOCATIONS)
ADHESIVE
1
ADHESIVE
1
DOORSTOP
FITTING
SCREW
NUT
(DOOR SHOWN IN THE
OPEN POSITION)
A-A
Fueling Power Control Switch
Figure 401
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
S 434-011
(3) Connect the leads for the fueling power control switch to the airplane leads.
S 864-012
(4) Make sure the magnetic actuator is installed on the bracket attached to the door stop fitting.
S 424-020
(5) If the magnetic actuator is not there, install a new magnetic actuator (View A-A): (a) Clean the mating surfaces of the magnetic actuator and the bracket (AMM 20-11-14/701). (b) Apply a thin layer of adhesive to the mating surfaces of the magnetic actuator and the bracket. (c) Put the magnetic actuator in the correct position on the bracket.
(d) (e) (f) (g) Install the screw and nut (two locations).Wipe off any excess adhesive.Align the magnetic actuator and the fueling control switch (View A-A).The cure time for the adhesive is 16 hours at 77° F (25° C).
NOTE:____ Curing time can be accelerated by the application of heat not to exceed 140° F (60° C) at the bondline. As a general rule, the cure time will be cut by 50% for each 20° F (11° C) rise in temperature. Temperatures below 75° F (24° C) will greatly increase the cure time.
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