(c)
Push the L and R UTILITY switches on the P5 panel.
(d)
Make sure the OFF lights on the switches come on.
(e)
Make sure the CMCS messages for the utility power ELCUs show.
(f)
Push the L and R UTILITY switches.
(g)
Make sure the ON lights on the switches come on.
S 864-027
(3) Remove electrical power, if it is not necessary (Ref 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
INSTRUMENT BUS VOLTAGE SENSE UNIT - REMOVAL/INSTALLATION
________________________________________________________
1. General_______
A. This procedure has two tasks. One task is the removal of the voltage sense unit (IBVSU) for the captain's instrument bus (M7507) or the first officer's instrument bus (M7508). The other task is the installation of the IBVSU.
B. The installation task includes an operational test of the IBVSU.
C. The IVBSUs are installed in the P6 (main power distribution) panel. The P6 panel is on the right side of the control cabin.
TASK 24-51-07-004-001
2. Instrument Bus Voltage Sense Unit Removal (Fig. 401)_________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AIPC 24-51-71
(3)
WDM 24-51-52, WDM 24-51-54
(4)
SSM 24-51-06
B.
Access
(1)
Location Zone
222 Control Cabin, RH
(2)
Access Panel
P6, Main Power Distibution Panel
C.
Procedure
(1)
Make sure all electrical power is off (AMM 24-22-00/201).
(2)
Open the access doors for the P6 panel.
S 034-018
(3)
Disconnect the electrical connector DM7507 or DM7508 from the IBVSU, as applicable.
S 864-003
S 014-004
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
SEE A
F/O INSTRUMENT BUS VOLTAGE SENSE UNIT, M7508
SEE B
CAPT INSTRUMENT BUS VOLTAGE SENSE UNIT, M7507
SEE B
P6 POWER DISTRIBUTION PANEL
A
INSTRUMENT BUS VOLTAGE SENSE UNIT (TYPICAL)
B
Instrument Bus Voltage Sense Unit Installation Figure 401
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 024-019
(4)
Remove the IBVSU:
(a)
Remove the four screws that attach the IBVSU to the P6 panel.
(b)
Remove the IBVSU.
TASK 24-51-07-404-008
3. Instrument Bus Voltage Sense Unit Installation (Fig. 401)______________________________________________
A. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AIPC 24-51-71
(3)
WDM 24-51-52, WDM 24-51-54
(4)
SSM 24-51-06
B.
Access
(1)
Location Zone
222 Control Cabin, RH
(2)
Access Panel
P6, Main Power Distribution Panel
C.
Install the Instrument Bus Voltage Sense Unit
S 424-020
(1)
Install the IBVSU:
(a)
Put the IBVSU in its position on the P6 panel.
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