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747-400 MAINTENANCE MANUAL
 S 745-985
 (7)  Push the AIR DATA CMPTR-C line select key on the CDU. (a) Make sure these conditions occur: 1) The Master Warning lights on the glareshield are not on. 2) The overspeed aural warning is not heard from the aural warning speaker. 3) The warning message, >OVERSPEED, does not show on the top EICAS display.
 S 745-989
 (8)  Push the AIR DATA CMPTR-R line select key on the CDU. (a) Make sure these warnings occur for approximately 2 seconds: 1) The Master Warning lights on the glareshield are on. 2) The overspeed aural warning is heard from the aural warning speaker. 3) The warning message, >OVERSPEED, shows on the top EICAS display.
 S 865-936
 (9)  Close the 415L39 CMC R circuit breaker on the P415 circuit breaker panel.
 S 865-937

 (10) Set the AIR DATA switch on the first officer's SOURCE SELECT module to the L position.
 (a)  
Make sure the advisory message, >SOURCE SEL ADC, shows on the top EICAS display.

 (b)  
Make sure the ALT flag does not show on the captain's and first officer's PFD's.

 S 865-924
 (11) Open the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
 (a)  Make sure the ALT flag shows on the captain's and first officer's PFD's.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  Make sure the status message, ADC LEFT, shows on the bottom EICAS display.
 S 865-941
 (12)
 Set the EIU switch on the captain's SOURCE SELECT module to the C position.

 S 865-942

 (13)
 Set the EIU switch on the first officer's SOURCE SELECT module to the C position.

 (a)  Make sure the ALT flag shows on the captain's and the first officer's PFD's.
 S 865-944
 (14) Close the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
 (a)  
Make sure the ALT flag does not show on the captain's and first officer's PFD's.

 (b)  
Make sure the status message, ADC LEFT, does not show on the bottom EICAS display.

 S 865-947
 (15)
 Set the EIU switch on the captain's SOURCE SELECT module to the R position.

 S 865-948

 (16)
 Set the EIU switch on the first officer's SOURCE SELECT module to the R position.

 (a)  
Make sure the ALT flag does not show on the captain's and the first officer's PFD's.

 (b)  
Make sure the V/S flag does not show on the captain's and first officer's PFD's.

 S 865-949
 (17) Open the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
 (a)  
Make sure the ALT flag shows on the captain's and first officer's PFD's.

 (b)  
Make sure the V/S flag shows on the captain's PFD.

 S 865-954
 (18) Close the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 725-990
 (19) Do these steps to do a test of the EIU switching for the center ADC:
 (a)  
Set the AIR DATA switch on the captain's SOURCE SELECT module to the C position. 1) Make sure the advisory message, >SOURCE SEL ADC, does not

 show on the top EICAS display. 2) Make sure the ALT flag does not show on the captain's and first officer's PFD's.
　
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