S 864-145
(2)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
S 024-003
(3) Remove the alternate VMO switch:
(a)
Remove the lockwire from the switch guard.
(b)
Hold the switch and remove the hardware from the switch.
(c)
Remove the switch guard and switch from the panel.
(d)
Identify the wires for the installation.
(e)
Remove the wires attached to the switch.
TASK 34-12-06-404-125
3. Alternate VMO Switch Installation
_________________________________
A. References
(1)
AMM 20-11-28/401, Lockwire
(2)
AMM 34-12-00/501, Air Data System
(3)
AIPC 34-12-55 Fig. 1
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A
747-400
MAINTENANCE MANUAL
B. Access
(1) Location Zone
118 Electrical and Electronics Compartment, RH
C. Procedure
S 864-244
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
S 864-184
(2)
Make sure these circuit breakers are open:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
S 424-006
(3) Install the alternate VMO switch:
(a)
Connect the wires to the switch.
(b)
Install the switch in the panel.
(c)
Put the switch guard on the switch and install the hardware.
S 864-223
(4)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7A10, ADC L PWR
2) 7A12, AOA L
3) 7A13, AOA ALTN L
4) 7A14, ADC R PWR
5) 7A16, AOA R
6) 7A17, AOA ALTN R
7) 7J15, ADC C PWR
(5)
Do a test of the alternate VMO switch (AMM 34-12-00/501).
S 434-009
(6)
Install the lockwire with the switch guard in the closed position (AMM 20-11-28/401).
S 714-008
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747-400 MAINTENANCE MANUAL
ADC TRANSFORMER - REMOVAL/INSTALLATION
______________________________________
1. General_______
A. This subject contains two tasks. The first task is to remove an ADC transformer. The second task is to install an ADC transformer.
B. The left (T131), the center (T133), and the right (T132) ADC transformers are installed in the P6 main power distribution panel.
C. The removal and the installation is the same for each of the ADC
transformers.
TASK 34-12-07-004-131
2. ADC Transformer Removal_______________________
A. Access
(1) Location Zone
222 Control Cabin, RH
B. Procedure
S 864-250
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
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