S 864-466
(7)
Close this circuit breaker:
S 754-279
S 754-281
(a) P7 Overhead Circuit Breaker Panel
1) 7J15, ADC C PWR
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747-400 MAINTENANCE MANUAL
S 754-282
(8)
Make sure the SPD, MACH, and ALT flags do not show on the PFD.
S 864-283
(9)
Set the AIR DATA switch on the captain's SOURCE SELECT module to the L position.
E. First Officer's ADC Source Select Relay Test
S 864-284
(1)
Set the AIR DATA switch on the captain's SOURCE SELECT module to the L position.
S 864-285
(2)
Set the AIR DATA switch on the first officer's SOURCE SELECT module to the R position.
S 864-505
(3)
Open this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7J15, ADC C PWR
S 754-286
(4)
Make sure the SPD, MACH, and ALT flags do not show on the PFD.
S 864-287
(5)
Set the AIR DATA switch on the first officer's SOURCE SELECT module to the C position.
S 754-288
(6)
Make sure the SPD and ALT flags show on the PFD.
S 864-544
(7)
Close this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7J15, ADC C PWR
(8)
Make sure the SPD, MACH, and ALT flags do not show on the PFD.
S 864-290
(9)
Set the AIR DATA switch on the first officer's SOURCE SELECT module to the R position.
S 754-289
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S 864-013
(10) Remove electrical power if it is not necessary (Ref 24-22-00/201).
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747-400 MAINTENANCE MANUAL
ADC SOURCE SELECT SWITCH - REMOVAL/INSTALLATION
_______________________________________________
TASK 34-12-05-004-001
1. ADC Source Select Switch Removal________________________________
A. General
(1)
The ADC source select switches are part of the captain's and the first officer's source select modules. The modules are found on the captain's P1-1 panel and on the first officer's P3-1 panel.
(2)
The removal/installation procedure for the source select module is found in AMM 31-61-07/401.
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MAINTENANCE MANUAL
ALTERNATE VMO SWITCH - REMOVAL/INSTALLATION
___________________________________________
1. General
_______
A. This subject contains two tasks. The first task is to remove an alternate VMO switch. The second task is to install an alternate VMO switch.
B. The alternate VMO switch is found in the main equipment center. The switch is found on the flight interphone jack and the attitude sensor assembly. The gear down dispatch switch (S1057) is installed at STA 411, WL 150, and RBL 4. The fifth engine carriage switch (S1460) is installed at STA 411, WL 150, and RBL 6.
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