(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 864-564
(3) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7J17, ADC C P/S XFR VLV
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34-12-04
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A
747-400 MAINTENANCE MANUAL
2) 7J19, ADC SOURCE SEL CAPT 3) 7J20, ADC SOURCE SEL F/O
S 024-003
(4) Remove the ADC source select relay:
(a)
Disconnect the electrical connectors from the relay.
(b)
Remove the screws.
(c)
Install dust caps on the electrical connectors.
TASK 34-12-04-404-276
3. ADC Source Select Relay Installation____________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
IPC 34-12-04 Fig. 1
B. Access
(1) Location Zones 117/118 Electrical and Electronics Compartment
C. Procedure
S 864-688
(1)
Make sure the two F/D switches on the MCP are in the OFF position.
S 864-349
(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 864-625
(3) Make sure these circuit breakers are open:
(a) P7 Overhead Circuit Breaker Panel
1) 7J17, ADC C P/S XFR VLV
2) 7J19, ADC SOURCE SEL CAPT
3) 7J20, ADC SOURCE SEL F/O
S 424-006
(4) Install the ADC source select relay:
(a)
Align the relay with the holes on the floor beam.
(b)
Install and tighten the screws.
(c)
Remove the dust caps from the electrical connectors.
(d)
Examine the electrical connector for loose, bent, or broken pins.
(e)
Connect the electrical connectors to the relay.
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34-12-04
ALL ú ú 16 Page 402 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-689
(5) 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
S 864-666
(6) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
(a) P7 Overhead Circuit Breaker Panel
1) 7J17, ADC C P/S XFR VLV
2) 7J19, ADC SOURCE SEL CAPT
3) 7J20, ADC SOURCE SEL F/O
S 864-012
(7) Supply electrical power (Ref 24-22-00/201).
D. Captain's ADC Source Select Relay Test
S 864-277
(1)
Set the AIR DATA switch on the captain's SOURCE SELECT module to the L position.
S 864-278
(2)
Set the AIR DATA switch on the first officer's SOURCE SELECT module to the R position.
S 864-427
(3)
Open this circuit breaker:
(a) P7 Overhead Circuit Breaker Panel
1) 7J15, ADC C PWR
(4)
Make sure the SPD, MACH, and ALT flags do not show on the PFD.
S 864-280
(5)
Set the AIR DATA switch on the captain's SOURCE SELECT module to the C position.
(6)
Make sure the SPD and ALT flags show on the PFD.
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