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 - - No fault detected
 (e)  If multiple faults should occur, the LED display will cycle through the faults in numerical order. The first fault is displayed for 5 seconds then the next fault in numerical order will be displayed for 5 seconds as long as the test button is pressed in.
 C. Control
 (1)  
There is no on-off switch for the ADCs. They are always on, provided their circuit breakers are closed.

 (2)  
Supply electrical power (Ref 24-22-00/201).

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747-400
MAINTENANCE MANUAL

 (3)  
Make sure these circuit breakers are closed:

 (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 8) 7J19, ADC SOURCE SEL CAPT 9) 7J20, ADC SOURCE SEL F/0

 (4)  
Make sure this circuit breaker is closed:

 (a) P7 Overhead Circuit Breaker Panel 1) 7J17, ADC C P/S XFR VALVE
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747-400 FAULT ISOLATION/MAINT MANUAL
AIR DATA SYSTEM
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  AMM REFERENCE 
CIRCUIT BREAKER - 1  FLT COMPT, P7 
ADC C AOA, C8591  7J15  * 
ADC C P/S XFR VLV, C10875  7J17  * 
ADC C PWR, C8594  7J14  * 
ADC L AOA, C798  7A12  * 
ADC L PWR, C734  7A11  * 
ADC R AOA, C567  7A15  * 
ADC R PWR, C799  7A14  * 
ADC SOURCE SEL CAPT, C10046  7J19  * 
COMPUTER - (FIM 45-10-00/101) COMPUTER - (FIM 34-61-00/101) COMPUTER - (FIM 34-46-00/101) COMPUTER - (FIM 22-10-00/101) LEFT CENTRAL MAINTENANCE, M7373 RIGHT FLIGHT MANAGEMENT, M7443 LEFT FLIGHT MANAGEMENT, M7442 GROUND PROXIMITY WARNING, X85 RIGHT FLIGHT CONTROL, B7079 LEFT FLIGHT CONTROL, B7077 CENTER FLIGHT CONTROL, B7078 ADC SOURCE SEL F/O, C10049  7J20  * 
COMPUTER - CENTER AIR DATA, B166  3  117AL, MAIN EQUIP CTR, E1-3  34-12-01 
COMPUTER - LEFT AIR DATA, B163  3  117AL, MAIN EQUIP CTR, E1-2  34-12-01 
CONTROLLER - (FIM 73-00-00/101) CONTROLLER - (FIM 21-30-00/101) COMPUTER - RIGHT AIR DATA, B164 RIGHT CABIN PRESSURE, M7949 LEFT CABIN PRESSURE, M7948 NO. 1 ELECTRONIC ENGINE, M7198 NO. 4 ELECTRONIC ENGINE, M7198 NO. 3 ELECTRONIC ENGINE, M7198 NO. 2 ELECTRONIC ENGINE, M7198  3  117AL, MAIN EQUIP CTR, E2-3  34-12-01 
DIODE - CAPT ADC SOURCE SELECT, M3721  -- 1  117AL, MAIN EQUIP CTR, E2-3  * 
MODULE - (FIM 27-40-00/101) MODULE - (FIM 22-21-00/101) MAWEA - (FIM 31-51-00/101) RIGHT STAB TRIM/RUDDER RATIO, M3137 LEFT STAB TRIM/RUDDER RATIO, M3136 UPPER YAW DAMPER, M7362 LOWER YAW DAMPER, M7363 DIODE - F/O ADC SOURCE SELECT, M3722 MASTER MONITOR B, YMX0A11 MASTER MONITOR A, YMX0A03  -- 1  117AL, MAIN EQUIP CTR, E1-2  * 

* SEE THE WDM EQUIPMENT LIST
Air Data System - Component Index
Figure 101 (Sheet 1)

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F05075
A
747-400 FAULT ISOLATION/MAINT MANUAL
COMPONENT  SHT 102 FIG.  QTY  ACCESS/AREA  REFERENCE 
MODULE - (REF 31-61-00, FIG. 101) 
CAPT'S SOURCE SELECT, M7991 
F/O'S SOURCE SELECT, M7995 
PANELS - (REF 31-61-00, FIG. 101) 
CAPT'S EFIS CONTROL, M7354 
F/O'S EFIS CONTROL, M7364 
EICAS DISPLAY SELECT, M7355 
　
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